easyturbokits.com » Turbocharged

Twincharging – Concept and Example Application

TeRBo — Tue, 23 Jun 2009 05:52:14 +0000

The first time I ever heard of twin charging (using both a turbocharger and a supercharger on the same motor) was probably back in year 2000. At that time I was very interested in performance for the Toyota Celica and naturally I also read a lot about its sister cars (that shared some of the same engines) such as the Camry and the MR2.

One of the most interesting aftermarket parts I ran across at the time was the HKS turbo kit for the 4AGZE powered 1st generation mr2. The 4agze (for those that are not familiar with Toyota engines) is a peppy 170 horsepower 1.6 liter engine powered by the Toyota SC-12 roots type supercharger. On this car Toyota used an electromagnetically clutched supercharger that could be disabled during low power requirements such as cruising, and engaged when the user demands it.

One of the most important parts of the HKS kit is the bypass valve. This valve was used to direct air from the supercharger to the engine at lower rpm/flow points. Once the rpm's rise, and the engine starts to demand more air, and the turbocharger is fully spooled, the valve switches over gradually till the turbocharger alone is feeding the engine while the supercharger is completely bypassed. The twin-charged MR2's were rumored to break the 300hp mark in some cases, depending on the final boost level and the supporting modifications, and this level of power for a 1.6 litre motor at the time was quiet astounding.

The theory behind this kind of system is to use a small positive displacement (roots style) supercharger. Supercharger performance efficiency is typically at its highest at lower engine and supercharger rpm's (for example from idle to 4000 rpm's). Above 4000 rpm's the supercharger's performance and efficiency starts to drop, the horsepower required to drive it starts to rise exponentially, and the air temperature coming out of the supercharger starts to rise dramatically limiting performance.

On the other hand, using a generously sized turbocharger will allow us to feed the engine efficiently with cooler air (than that from an overworked supercharger) and maintain high rpm performance. The problem with using a larger turbocharger is that a generously sized turbocharger typically doesn't spool before 3000 to 4000 rpm's giving us a limited power band and thus providing no performance boost at lower rpm's.

The idea of twin charging is to use both a supercharger and a turbocharger to have each charger do what it does best, have the supercharger boost the motor for low end torque, and as it runs out of steam, the turbocharger comes online to carry us through to redline.

There are three aspects to these types of systems that make them prohibitive to most tuners:

1. Cost and complexity: Having a complete supercharger system as well as a complete turbocharger system on the same vehicle is a lot of money to spend and a lot of parts to deal with and diagnose in case something does go wrong.

2. The bypass valve used to bypass the supercharger (and yet hold in all the air pressure coming from the turbocharger) as well as being able to control this valve electrically or mechanically requires a custom made one off valve that isn't quite available off the shelf. Although as I write this it seems possible to find a large sized dual chamber bypass valve plumbed to operate on the differential pressure between the turbo outlet and the supercharger outlet to switchover once the turbocharger pressure = the supercharger pressure + the tension of the bypass valve opening mechanism.

3. Since we are using two different types of chargers with two different efficiency maps, it can get very complicated to figure out how to tune the motor (especially with much simpler fuel injection systems that were used at the time) because the air density can vary dramatically at the same rpm point and pressure level depending on which charger is feeding air to the motor and at what proportion. This is also where the HKS turbo kit for the 4agze was at its weakest, namely at smoothing the transition point fueling between the supercharger to turbocharger switchover.

One of the things that has changed over the last 10 years is the availability (and proliferation of knowledge) about available alternative fuels or octane boosters. Two such options are:

1- E85 fuel which is comprised of 85% Ethanol which has an octane rating of about 100 to 105 octane vs the typical 87 to 93 octane pump gasoline.

2- Water / methanol injection systems that can be used either as supplemental fueling system (based on the methanol content which carries an octane rating of 110 octane or higher) or can be used for in cylinder cooling when the water vapor injected with the methanol transforms into steam inside the combustion chamber, thus extracting lots heat out of the combustion chamber, and thus slowing down the speed of travel of the combustion flame front simulating the effects similar to those of a higher octane gasoline.

With the availability of these octane increasing or octane simulating concoctions, it has become more accessible of recent for the performance enthusiast to build a different type of twin charger system that does not require a bypass valve.

In this type of system the supercharger outlet is routed to feed the turbocharger inlet or vice versa. Rather than either the supercharger or the turbocharger feeding the engine individually (in parallel operation) and switching between the two, we are now using a two stage compression system where one stage is the factory supercharger, and the 2nd stage is an aftermarket turbocharger system.

The net result of the two compressors is a compounding of pressure ratios. For example if the turbocharger waste-gate opening spring is set to a setting of 7psi of pressure above atmosphere (which is a pressure ratio of 1.5 given that 1 atmosphere is about 14.7 psig); and if the supercharger is mechanically geared to flow 50% more than the engine (for positive displacement roots style superchargers) at any rpm, thus having an identical 7psi boost setting or a pressure ratio of 1.5; then the resultant pressure ratio of the system combined is :

PR total = PR turbo * PR supercharger = a pressure ratio of 2.25

A pressure ratio of 2.25 is equivalent to 18.4 psi of boost (not 14psi expected by adding the two stages together).

So anyway, how does this relate to octane requirements ?

If the turbocharger is feeding the supercharger for example, and the turbocharger is ingesting fresh air at ambient air temperatures (T1), then:

1- The air exiting the turbocharger will be at a temperature T2, higher than the ambient air temperature (T1) by about 60-80*C depending on the exact turbocharger, and where we are on the turbocharger compressor and efficiency map.

2- The air entering the supercharger will enter at a temperature T2 ~=T1+60 and exit at a temperature T3 which is higher than T2 by about another 60-80*C depending on the exact specifications of the supercharger.

3- If we had an intercooler after the supercharger, then the air entering the intercooler will be at 120 to 160*C above ambient temperatures which is a lot of heat for the intercooler to attempt to shed in the short amount of time that the air passes through the intercooler core.

4- If we have no post supercharger intercooler (which is common on cars where the supercharger is packaged into the intake manifold of the car), then the air entering the engine will be at some 120 to 160*C above ambient.

5- This excessively heated air not only reduces power output (By about 1 horsepower for every 13*C) but it also increases the probability of the air fuel mixture automatically igniting in the motor pre-maturely before the spark plug has fired, and if this pre-mature ignition occurs early enough to catch the piston significantly far away from top dead center, then the battling flame front pushing the piston downwards, and the inertia of the system (and force of other firing cylinders rotating this piston via the crankshaft) pushing the piston upwards will cause extremely high pressures and a temperature rise on the surface of the piston ultimately damaging it and possibly damaging other parts of the motor as well.

For these reasons (pressure compounding, and combined temperature rise) sequential charging has seen very little application in the past. The use of a higher octane fuel by definition means that the air fuel mixture is more resilient to auto-ignition and detonation. Furthermore, in the event of a pre-mature ignition, the higher octane fuel creates a slower traveling flame front which gives the piston more time to travel upwards in the cylinder bore (Closer to top dead center) before meeting the flame front and this reduces the time that the piston surface is improperly pressurized and overheated reducing the possibility of catastrophic failure. Last but not least, the use a water / methanol injection mix includes two phase-change events:

1- The injected methanol changes from a liquid state to a vapor state at its boiling point of 65*C, i.e. as soon as it hits the compressed air mixture coming from the supercharger outlet. This phase change absorbs a lot of the heat out of the air and methanol mixture reducing inlet air temperatures even before the mixture reaches the combustion chamber and starts to get compressed. This temperature reduction goes a long way towards eliminating or highly reducing the possibility of detonation.

2- The injected water, changes from a liquid state to a vapor state at its boiling point of 100*C which depending on the availability of an intercooler in the system, my occur in the intake plumbing before reaching the combustion chamber, or may not occur until the mixture is ignited. Either way, when the temperature is high enough, the water mist injected in the air stream will flash vaporize into steam also absorbing a generous amount of the heat created in the combustion.

The availability of these two octane boosters makes it now possible for aftermarket performance part manufacturers to deliver safe and reliable sequential charging kits to the mass market.

One such kit which I ran across in an article from hot rod magazine was developed by hellion performance (http://www.hellionpowersystems.com) for the factory supercharged GT-500 mustang.

The kit supposedly produce up to 1000 horsepower at a boost level of 24 psi using two 61mm Turbonetics turbochargers.

To achieve 1000 hp requires around 1500 cfm of airflow at 24psi or 1500cfm at a pressure ratio of 2.63, or 750cfm @ 2.63pr per turbocharger.

Since most compressor maps for this size of turbocharger (61mm) peak out at around 600cfm @ 2.63 pr @ around 50% efficiency which is an extreme point on the map (i.e. the turbocharger is maxed out at this point). I'm going to say that I am confident that the kit is capable of supporting 800hp with a typical pair 61mm turbocharger, however 1000hp although dyno-proven, does not agree with what is published on most 61mm turbochargers. I'm not doubting the kit, I am stating that I don't have a better reference for the specific turbocharger used in the kit.

Furthermore, feeding 1000hp from 8 injectors requires eight 750cc/min injectors by my estimate and this agrees with what is mentioned on Hot Rod magazine's article of needing 75lbs/hour injectors (each lb/hour is roughly equivalent to 10.5cc/min) at a minimum or a total fuel deliver requirement of 900 liters per hour of fuel at a the fuel rail pressure which is typically around 45psi.

Looking at the flow capacity of the GS342 fuel pump supplied with the kit, which is 255lph @ 30psi, then using 3 fuel pumps gives us the capacity for 765lph which is about 2125 hp worth of fuel, so in that regard the kit is capable of supporting the power figure.

As you can see, it is possible to design such a complex system if the information (Turbocharger compressor map, turbocharger temperature map, supercharger compressor map, supercharger temperature map ...etc) information were available before hand. What remains a mystery and an art of trial and failure, is how over-engineered is your engine, how much torque can it produce and still continue to survive, and how long can it continue to survive at elevated power levels. That is altogether a more exciting question to answer.

I am an electrical engineer : ) although by writing about this stuff you'd think that I'm a mechanical engineer. Have been Interested in cars and performance for the last 13 yeas and more. I have moderated one import car performance website for about 3 years before I handed my duties over to someone else. I have turbocharged one car, and blown up three engines which I mark off to 'experience'.

My current vehicle is a 2005 Mercedes C200 Kompressor which is supercharged.

I also run my own informational site focused on the supercharger performance niche. http://www.superchargerperformance.com

Hope somebody finds some good entertainment and educational value from my writings.

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twincharged

Mazda RX8 Turbo Kits Video, Deals & FAQ

TeRBo — Tue, 12 May 2009 14:25:24 +0000

Mazda RX8 Turbo Kits Video

New RX-8 videos with a larger custom built Garrett GT3071R turbo!
Short video clip of turbocharged Mazda RX-8. GReddy turbo, Interceptor-X EMS, custom CAI, borla catback, B&B catless midpipe. This video clip was meant to just show how the car sounds with these mods.

Great Deals On Mazda RX8 Turbo Kits

EXEDY STAGE 2 THICK CLUTCH KIT PROBE GT 626 MX 6 22L TURBO B2600 26L RX 8 13L
US $434.04

EXEDY 3 PUCK THICK CLUTCH KIT RX8 RX7 TURBO 86 91 FC3S PROBE MX6 626
US $434.04

T3 T4 TURBO KIT MAZDA MX 3 MX5 MX 6 RX7 RX8 PROTEGE 323 ECLIPSE TALON 420A NEON
US $520.00

JDMS 2004 2007 MAZDA RX8 T3 T4 TURBO KIT 04 05 06 07
US $888.00

2004 Mazda RX 8 PTP Turbo Kit Add 100 HP
US $1,495.95

Greddy 11540050 2004 ON Mazda RX 8 RX8 Turbo Kit
US $4,465.00

Esmeril Racing Mazda RX 8 Standard Turbo Kit
US $4,495.00

GREDDY TURBO BOLT ON KIT 04 06 MAZDA RX8 T618Z IC
US $4,899.00

Mazda RX8 Bolt on Turbo Kit GReddy NEW WARRANTY
US $5,580.00

Turblown Mazda Rx 8 Rx8 Turbo Kit
US $6,499.00

RX8 Turbo Kits Frequently Asked Questions

adding a turbo to a rx8 with ebay intercooler and others?

will it be ok to add a garrett turbo with the rest of a ebay turbo kit (without ebay turbo) on a 04 rx8 manumatic .

ANSWER: (Yes you can. Go for it. Just so you know those parts you bought off ebay are all probably china parts that will fail after 20,000 miles or less. Depending on the size of that turbo your rotary is going to blow to little triangle pieces and no one in america really knows how to rebuilt one to endure high amounts of forced induction.Just saying....being a dick so you don't ruin your car.)
Turbo kit for a Mazda rx8 2-cylinder rotary engine?

I can't find. Link to a website that sells turbos for a rotary engine, it's a 13b 1.3liter 2-cylinder rotary engine, I'm on my iPod do to conp. Problems so it's hard to find a site.

ANSWER: (www.turbokits.com-They have a few on this site for the RX-8www.protegegarage.comwww.corksport.com)
What car should i get when I become 16?

Im currently 14 and turn 16 in 1 1/2 years. Here are my choices. I was thinking of a new model mazda rx8 r3 for 35k. A used mazda rx-7 twin turbo with veilside fortune body kit added on for 20-30k( Keep in mind, that car is about 12k with the body kit i want costing an extra 17k). A 94-97 supra for 20-30k. A new model Camaro ss for 20-30k. Or a 2005 dodge neon srt-4 for around 10k. Basically I want a fast loud 2 door that turns heads and isnt too expensive. I know newer cars have increased insurance prices, so something good from 1990-2000 would be nice with a good body kit added on. What should i get?rrb, how do i "Drive with more skill" when i dont even have a car?

ANSWER: (You could just do what I am doing, I'm building a car from the ground up with my own original design, try doing that, just think you can build a car looking just like those brand new same price or a little bit more but it will be new, but if you really want one of them cares just go with the mazda rx-7 put a new engine and transmission and new seats in it and call it good, probably new paint, but you do need a job before you do this you know, I still working at various jobs that will hire me to build my car)
how much is a turbo kit?

like a kit that would iclude everything and would make sure my engine doesnt blow up, also would i need to purchase an intercooler. its for my mazda rx8 2004.do you guys know a website where i can order it from

ANSWER: (Try http://www.rx8club.com/ and looking / posting there, you might have more luck)
Where can i find a turbo kit for my 2005 automatic mazda rx8?

I realize that getting a manual one would be better but it is my first car and unless i can find a manual one with an exhaust kit and cold air intake that someone is willing to sell for a reasonable price, which i haven't been able to do.. so if someone could help me out that would be really great.

ANSWER: (Don't take it the wrong way, but you sound like one of those need for speed kids. So here's a lesson from Professor Akagis White Comet, owner of a heavily self-modified 1987 RX-7 GXL, now with a 20B-REW under the hood.Manual>Automatic no matter what you do to itForced induction will shred the automatic to bits at anything over 5psi. In simple terms, it can't handle the torque of a turbo like the FC and FD can. And even then, they just barely could handle it. You're better off with a manual transmission, period.Any intake kit will be discarded with forced induction because everything between the exhaust manifold and throttle body will be replaced. The stock SE3P exhaust is fine, but if you insist on an upgrade, go with Racing Beat. Your lack of ricer noise tickets will thank you.)
How Long for turbo uninstall ?

I have a 06' Mazda RX8 Im having the turbo kit uninstalled on and its around $95/hr so I was wondering how long it usually takes shops ? Im hoping to keep this around the $1000 mark, under if Im lucky. It is the Esmeril Racing turbo kit, and I have boost, AFR, Oil Pres, Oil Temp, Water gauges to have uninstalled as well. Im getting a new car soon and need to go back stock and sell everything. Just looking for estimates, knowing my luck its going to take 3 or 4 days haha.

ANSWER: (A lot depends on the skill level of who's doing a job like this, so it's hard to say.)
Tuning tips for a Mazda RX8?

I'm probably going to be getting a 2004-2006 RX8, and I am definitely looking at adding some performance tuning. I was thinking about a turbo, but I can't seem to find any good reviews online. I have seen some of the GReddy turbos and Esmil kits that make around 300 WHP. I am looking for something that is good, but not too crazy (powerful) and expensive. Also, would a turbo be enough, or what else would I have to do in order to make the car run well? Basically, what would I have to install with the turbo? Most likely an exhaust?I really appreciate the help.Cheers!

ANSWER: (Mr. Henry Ford had a test he gave all engineers before he hired them. He took them out to lunch and watched to see if they tasted the food before adding salt or pepper. If a prospect applied spices to the meal before tasting it they did not get hired!Please find out if you truly need to do anything before you jump in throwing parts on a car before you have mastered what you already have.The RX8 is one of the most technologically advanced automobiles that the general public can afford. Too many RX8 owners have or will ruin an otherwise great car trying to squeeze more horse power out of them then they can use.Think about it please.)
Is Pre-tuned Turbo Safe ?

Im wondering if it would be safe to install my Esmeril Turbo Kit on my mazda rx8 and run the pre-tuned map from esmeril on my interceptor-x ems for the 500mile break in period at the recommended 2psi untill fully broken in which is when I will get it dyno tuned.Any help would be appreciated! Thanks!

ANSWER: (Yup! Its pretty much is safe.)
Pre-tuned Turbo Install?

Im wondering if it would be safe to install my Esmeril Turbo Kit on my rx8 and run the pre-tuned map from esmeril on my interceptor-x ems for the 500mile break in period at the recommended 2psi untill fully broken in which is when I will get it dyno tuned.

ANSWER: (Attached link to details.http://www.rx8club.com/showthread.php?t=138519)
Turbo Timer ? Worth it?

Is a turbo timer really worth it? Running the esmeril racing turbo kit on my rx8. Im thinking of just sitting in my car and letting it cool for about a minute or so instead. I heard it can cause problems with the immobalizer?

ANSWER: (Unless you run the car really hard then shut it off right away you probably don't need one.)
mazda rx 8 2007??????????

completely stock right now but wondering if i should upgrade i got about 220hp right now but after i put borla exhaust and intake+GReddy turbo kit what kinda hp would i be making i dont know much about how to get the most bang for my buck but thats why i am asking is there any other mods u could tell me to help me get hp the reason why is the mustang gt's are beating me and that was the reason i got a rx-8 was so i wasnt just another guy in the crowd with a gt............http://cgi.ebay.com/ebaymotors/GReddy-MAZDA-RX8-2003-ON-BOLT-ON-TURBO-KIT-INTERCOOLER_W0QQcmdZViewItemQQ_trkparmsZ66Q3a2Q7c65Q3a3Q7c39Q3a1Q7c240Q3a1318Q7c301Q3a1Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem2553f589efQQitemZ160322390511QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessoriesQQsalenotsupported

ANSWER: (How much additional horse power is related to how much boost!If you want to beat the mustangs, think about a Super charger.Keep in mind that the RX8 is not a drag racer, to treat it as such will shorten its life.I have included a link to the installation instructions by the way so that you can see what you are getting yourself into.)
What is a decent turbo kit for the rx8 that isnt too expensive?

im looking at a price range of 500 to 2000thanks

ANSWER: (For that much money you wont get anything good. Buy something good the 1st time so you aren't replacing it in a year.)
what turbo kit produces the most whp increase on an rx8?

ANSWER: (Everybody sing now... "POP" goes the motor...Turbocharging the Renesis needs to be done very carefully. The rotors are high-compression (10:1), much higher than engines designed to be TC'dIf you plan this join in on the discussions at:http://www.rx8club.comThere are many people there who've TC'd or SC'd their 8's. Some successfully, some who blew their motors.)
Compare the RX7 and RX8 engines?

what are the differences between them? which would be better to put a turbo on? are there extra rotor kits for either? and anything else important. Thanks!!!!!!!!!!!

ANSWER: (everyone answering this question before me is retarted. there isnt much difference between the actual engine other then the rx7 has a turbo and the rx8 is NA and makes a little more hp but loses some torque. you can add turbos to either engine to get some more power or get a 3 rotor kit, or if you want a real race engine you can get a 4 rotor kit and SINGLE turbo it which makes much more power and is more reliable then quad turbos on this engine. anyone who thinks otherwise is stupid.)
Mazda Rx8 Starting Mods.?

I just bought a used 2006 Rx8 6 speed AUTO.i didn't get the manual for a couple of reasons but thats not the point. I was wondering what mods i could start off with right now riding fully stock performance becuase i want to increase the performance and keep the exterior stock. a turbo kit is too much right now. Limit around 1.5k. I was thinking a AEM cold intake, and a greddy sp2 exahust. but i also heard that's a waste because only adds a little hp gain. please gimme so advice.

ANSWER: (I see you've done your research. Yes, Mazda made very efficient intakes and exhausts for their RX8's. Dyno tests have proven that aftermarket intakes and exhausts for the RX8 generally give you about 3 to 5 HP increases each. Probably the best bang for your buck is the Cobb Accessport Flash Tuner. "Chips" are useless for this car, instead just reflash the PCM/ECU with better maps. See here:http://cobbtuning.com/products/?id=3812 A good shop to buy this at is: http://www.mazdamaniac.com/cobb/accessport.htm He will make up safe maps for you if you buy from him. )
Professional help with rx8? details inside and 10 pts for bst answer!?

ok lets say i have a mazda rx8 and i wanted to put a cold air intake and a turbo kit on it. do you think this would shorten the life of the renesis rotary engine? if so is there any possible way of putting a turbo and a cold air intake without doing any harm to the engine? i need professional help with this question Thanks

ANSWER: (If you do proper maintenance and don't beat it to hard,it should be fine.)
Is there a turbo kit out there for a 2004 RX8 with the automatic w/ electro shift???

ANSWER: (aftermarket turbo + normal factory automatic transmission = dead carIf you want to go faster, swap to a manual transmission, then add performance parts. A stock automatic simply will rip itself apart, unless it is a VERY heavy-duty gearbox, like a GM turbo 350/400.If you want a turbocharged rotary, get a RX7, either a FC or a FD. There's a big aftermarket for it and you won't risk voiding the warranty, being displeased with the results or ruining the car like you would with turboing a RX8.)
Will Mazda Rx7 twin turbo and aftermarket parts have more hp then Rx8 with a aftermarket turbo kit and parts?

I want the fast one with more handling and more aftermarket mods that can go into the car....i am going for a fast and furious look rx7 or rx8 from tokyo drift? I WONT SPEED AND HP ABOUT or Around 500-600hpwhat year for the Rx7 if i should get it?

ANSWER: (The Rx-8 has a very high compression ratio for boosted applications. On top of that the computer is hard to crack. You can boost cars with high compression but ultimately the renesis's so called advantage in economy and emissions are its biggest road block to producing power. Side ported exhaust...The old Rx-7's have WAAAY more potential in power production than the renesis. On top of that the all the seals are optimized for boost in the 13B-REW. The side ported exhaust reduces port overlap, thus improving emmisions and economy. But in a performance engine you want the biggest ports possible without losing intake/exhaust velocity. In a Rotary, the exhaust port can be REALLY BIG. The largest port possible on a rotary is called a peripheral port. It seals up the side port and bores a huge hole through the end of the rotor housing. ALL Rx-7's (and all rotary cars before it) came from the factory with a peripheral ported exhaust. In order to match the Rx-7's turbo loving exhaust ports, you would have to tear the engine down and send it out to get the exhaust ported. Hands down a turbo Rx-7 (or any Rx-7 for that matter) has a huge advantage over the Rx-8.On top of that the Rx-7 has a more boost friendly compression ratio making for easier tuning. I love the new Rx-8s but they just arent quite filling the Rx-7's shoes. And any Rx-8 owner reading this, that thinks otherwise.... You really, seriously need to just ride in a 3rd generation Rx-7. Night and Day, sorry guys but I am telling it how it is, not trying to hate on you.Any 93-95 Rx-7 will get you what you are looking for.)
If I buy a Stage 3 Turbo Kit for a Mazda RX8 could I just switch that turbo for a bigger one?

Turbo Kit Type 3 for RX8: http://www.mazsport.net/store/index.php?l=product_detail&p=16The turbo I want to put on it:http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT45/GT4508R.htm

ANSWER: (It is a matter of how much boost do you want.There is a point at which a bigger turbo charger would be needed. You need to compute the amount of boost you want, then figure out how many CFM it takes to achieve that boost.A 1600 non- rotary engine needs about 300 cfm at normal atmosphere (no boost) when running at 7,000 rpm. So if I want to run 15 psi boost, I would need a turbo charger that can produce 600 cfm. So i would look for a 700 cfm turbo.So I am not sure, while I can compute it for a cylinder engine a rotary is beyond my knowledge.)
reliable cheap turbo kits for a 2004 grand touring rx8?

Have a welder, very nice plasma.... need a manifold and intercooler or Kit doesnt matter summer is on the way and trying to save some money towards new summer tires and rims thanks!oh hey Jack AS5 its possible buddy, herd of greddy.. young jerk offs....mature anwsers only the rims comment is a joke ok when i say cheap i mean under 1500 i can get a intercooler for bang for the buck, aight

ANSWER: (RELIABLE AND CHEAP DO NOT BELONG IN THE SAME SENTENCE.SPECIALLY WHEN YOU ARE TALKING ABOUT THE MOST EXPENSIVE THING YOU OWN.THAT IS IF YOU'VE DONE ALL THE MODS THAT YOU SHOULD HAVE DONE)
Where can i get an affortable turbo for my rx8 2004 grand T 6 port?

I'm looking for a either assembled or non assembled turbo kit, it doesnt really matter since my father owns a new plasma welder. This would be great due to the lack of torque i already have a few in mind but don't want to pay thousands of dollars if at al possible, i've looked into ebay and some local stores on craigslist.org in select cities but the best deal i can come across is 899. Well thanks for your time!-Willvery true on the ecu but my concerns are for the kit an ecu is alot easier to get my hands on that the kit itself, once i know my boost psi i will start looking. Thats a great reminder, thanks

ANSWER: (yes you can get all turbo parts for less than a 1k assuming you will install it by yourself but...... what about the ecu?you cant make it turbo without the proper ecu and thats will cost you some hundreds more no spend...... no gain ! !)
mazda rx8 turbo?

what to be better for my rx8 twin trubo not too big or one big one which is better also can you recommend me a kit on with not too much power one at will leave those river kids at my school also one with not too much lag

ANSWER: (A mid-sized turbo is just fine for the RX8 as you can't run really high boost levels anyway. The Renesis runs 10:1 compression so you should stay away from high boost levels unless you're VERY good at tuning and don't care if you severely shorten the motor's life.Very good gains can be made with only 6 - 8 PSI boost. What you do need is a turbo that can flow high volumes of air as opposed to high pressure. Due to the nature of the rotary and its extended RPM range many turbo's hit their peak flow at around 7000 rpm whereas the tertiary ports don't even open until 7200, and the motor runs to over 9000. Sourcing a turbo that can maintain good air volumes into those rpm ranges are difficult to find.)
question about greddy bolt on turbo kit for my '04 mazda rx8?

i have the HKS RACING Suction and the greddy turbo kit comes with an airnx kit. i dont know if i have to change it or can i keep my HKS intake. i have the HKS legamax exhaust if that makes a difference.

ANSWER: (you have to change your intake...the stock intake will not fit on turbo models because the piping is going a different way)
is the rx8 a good car to work on and also if i get it where should i get my turbo from?

when i say work on i mean is it good to buy parts for and tune them. and when i say where i should get me turbo from i would like to know exactly what company and which turbo kit. leave a link if possible

ANSWER: (You know it is a rotary engine right? The only make and model of car currently being produced with such an engine. They can rotate at incredible speeds but parts are going to be much more expensive than typical piston driven engines. Not many people know how to work on them.Greddy is one of the few companies that makes turbos for these cars. I would make sure that your factory warranty is already expired before I install one as it will void the warranty. A warranty on a car like this could be a huge money saver.)
How much would a Turbo Kit go for, for a 06 Rx8??

and im also curious to know if anyone has done this or know someone that has done this and if so, did they like it?? or was it just more pain then pleasure??

ANSWER: (tryhopupracing.com)

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Articles on RX8 Turbo Kits

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