Renesis hard to turbo?

[Renesis Rising]

is there any truth to this...i just heard of turbo kits for the renesis!! now im all confused...

 

[KYLiquid]

check out www.rx8club.net

you can turbo the renesis, you have to remeber is 10:1 compression and was meant to be NA, not turbo...so there is a bit of work involed with getting good, reliable power out of the renesis with a turbo....

right now the best stuff on the market is the greddy kit, with the x-interceptor, dyno-tuned you can make 300hp+/250tq+ out of the renesis AT THE WHEELS! thats compared to 180hp/130tq at the wheels stock. So its a big improvement, and definetly the best route if you want more power....of course thats only with the 6speed. not the automatic.

Your gonna be spending at least 5k to get a stock rx8 running reliably with 300hp at the wheels...but it can be done.

 

[Renesis Rising]

and my pockets say s*** godddaaaaaaaaaamn.....but all that increase in power also come with upgrading brakes and suspension to handle all that. so that even more money right?

 

[KYLiquid]

and my pockets say s*** godddaaaaaaaaaamn.....but all that increase in power also come with upgrading brakes and suspension to handle all that. so that even more money right?

if you get a sport package or higher, you get the upgraded breaks and sports suspension.

The breaks on the RX8 are already very good (the rx8 and Mercedes/Mclaren SLR both have the same stoping distance from 60mph-0mph (112 feet))

The suspension is good enough for a while. I am NA still, stock power and am upgrading the suspension to make the car handle better....so at any power lvl you could use a better suspension.

At the 300hp lvl, the rest of the car stock can handle the power, I would first change the suspension.

For the brakes I would get stainless steel lines and better break pads, maby even better rotors, but a swap to a brembo kit, ect isnt needed.

If you turbo the car you will need a new clutch and I would get a flywheel at the same time, thats about an extra 800 bucks.

 

[Renesis Rising]

well that isnt that bad...thank god mazda inadvertendly made it easier on us rx8 lovers

 

[Signal 2]

I'm not an engineer, but IIRC, another major reason that the RENESIS doesn't respond well to turbos is due to the design of the ports. The exhaust does not have an unobstructed route to the turbo, and likewise the intake port aren't as direct into the combustion chamber as they were in the 13b or 13bREW. As I understand it, the design change helped to make the car more CARB compliant, and the higher compression rotors gave more NA power, but both made a turbo version more difficult. Add on the restriction caused by the turbos themselves, and there just isn't as big of a return.
Nothing to back this up, but personally I think before we see a factory turbo renesis, we'll see a three-rotor NA.

 

[KYLiquid]

I'm not an engineer, but IIRC, another major reason that the RENESIS doesn't respond well to turbos is due to the design of the ports. The exhaust does not have an unobstructed route to the turbo, and likewise the intake port aren't as direct into the combustion chamber as they were in the 13b or 13bREW. As I understand it, the design change helped to make the car more CARB compliant, and the higher compression rotors gave more NA power, but both made a turbo version more difficult. Add on the restriction caused by the turbos themselves, and there just isn't as big of a return.
Nothing to back this up, but personally I think before we see a factory turbo renesis, we'll see a three-rotor NA.

the major factor against a new turbo rotary is emissions and catalytic converter life. New US regulations require that the cat in a new car last 8yrs/80k miles (i think thats right) and a big thing that kill cats are high EGT's and running rich, both of those are thigns that rotarys do.....so mazda would be on the hook replacing cats all the time (if they could even meet emissions) or run the car with so little boost there is no point.

The renesis can take to a tubo very well.

A stock NA 6port (6speed) RX8 makes about 180whp/130wtq

The same car with the greddy turbo kit, exhaust and x-interceptor ecu (tuned) makes 330whp/280wtq.........your almost doubling the power of the car,and your MORE than doubling the TQ....amazing!

Thats a 150whp/150wtq increase for about 5k in parts/tuning......not bad at all, I would say the renesis takes very well to turbo.....it has 6 intake ports, and the ports are larger than any other rotary made, and also the higher compression leads to more power.

The exhaust ports and location of the exhaust manifold make getting good flow OUT of the engine and placing a good size turbo difficult but not impossible.

The way the exhaust ports are is killing exhaust flow, not by a lot, but noticable, you could maby pickup 10-20 hp at redline with a better port design but thats not something we can really change......

The intake ports/manifold flow better (and more) air/fuel than any other rotary.

 

[ghettobubba2001]

(omg) anyone got an rx8 turbo kit on they're ride yet? i want to see flames

 

[REMillers]

(omg) anyone got an rx8 turbo kit on they're ride yet? i want to see flames

no need for a turbo then if you just want flames:


(forum member on the rx8club forum)

http://www.rx8club.com/attachment.php?attachmentid=65227


video

And there are a few turbos out there and a 3-rotor turbo in PR...now thats the (shocked) of (omg)

 

[Signal 2]

the major factor against a new turbo rotary is emissions and catalytic converter life. New US regulations require that the cat in a new car last 8yrs/80k miles (i think thats right) and a big thing that kill cats are high EGT's and running rich, both of those are thigns that rotarys do.....so mazda would be on the hook replacing cats all the time (if they could even meet emissions) or run the car with so little boost there is no point.
The renesis can take to a tubo very well.
A stock NA 6port (6speed) RX8 makes about 180whp/130wtq
The same car with the greddy turbo kit, exhaust and x-interceptor ecu (tuned) makes 330whp/280wtq.........your almost doubling the power of the car,and your MORE than doubling the TQ....amazing!
Thats a 150whp/150wtq increase for about 5k in parts/tuning......not bad at all, I would say the renesis takes very well to turbo.....it has 6 intake ports, and the ports are larger than any other rotary made, and also the higher compression leads to more power.
The exhaust ports and location of the exhaust manifold make getting good flow OUT of the engine and placing a good size turbo difficult but not impossible.
The way the exhaust ports are is killing exhaust flow, not by a lot, but noticable, you could maby pickup 10-20 hp at redline with a better port design but thats not something we can really change......

Interesting. I stand corrected. I'd read somewhere about the concern for cats too, but not seen the figures you quote for the Greddy unit. If those are accurate for rwhp, that does seem like a good value. In every damn reveiw of the RX8 I see the authors LOVE the car, handling etc. but ding it on low-end grunt. That would definitely be one answer.

 

[KYLiquid]

Interesting. I stand corrected. I'd read somewhere about the concern for cats too, but not seen the figures you quote for the Greddy unit. If those are accurate for rwhp, that does seem like a good value. In every damn reveiw of the RX8 I see the authors LOVE the car, handling etc. but ding it on low-end grunt. That would definitely be one answer.

those are power figures I have seen the dyno sheets on, not clear if its on pump gas (91/93) or what.....thats the only X factor

 

[ghettobubba2001]

why would it be on race gas most kits are meant to run on premium - 93 so really why would they dyno that s*** with race gas.

 

[Captain KRM P5]

i have read that many people have blown thier renesises (sp?) with the GReddy kit even when tuned religiously on the emanage, something where the emanage does not always work as prescribed?

 

[KYLiquid]

i have read that many people have blown thier renesises (sp?) with the GReddy kit even when tuned religiously on the emanage, something where the emanage does not always work as prescribed?

out of the box the greddy kit is garbage, if you just bolt it on and run the base maps, youll get like 40hp/20tq.....seriously, its worthless.

To get good power you have to tune it.

The biggest problem with turbo on the rx8 (renesis) is the ECU, it is just too damn smart, if you hook up an emanage it will work for a while, but over time the stock ECU releans and adjusts the fuel/timing back to what it should be NA, the problem is that you are still running boost, so the car leans out and after that it doesnt take much to blow the seals in a rotary (much less resistant to detonation than a piston engine).

So if you dont have an eye on the AFR then you can blow the motor, even with a tuned emanage.

Some have found a way around this by having the emanage control an extra set of injectors, so that only the emanage controls them, and the stock ecu is cut off, doing that lets you add the extra fuel without the worry of the stock ecu pulling the extra fuel back out. If you dont do that, you would have to reset the stock ecu and retune the emanage all the time, the emanage ultimate is a little better, but you would still run into the same problem.

You can rip out the stock ECU and put a standalone in, cuase you would lose radio, ac, PS, ect, ect, ect..everything is tied into the ECU. So your only option (for a street car) is piggy back.

The X-Interceptor (sold by Mazsport in Tampa, FL) is the best thing on the market, NA or Turbo can use it..

Its a piggy back (like the emanage) but it takes FULL CONTROL of the fuel and timing on the motor, because it takes full control (both open and closed loop) it HAS to be tuned, as all the fuel maps have to be set. I belive the unit (with tuning) sells for under 2k, thats a really good deal!

With the greddy kit (around 3k retail) and the x-interceptor ecu (around 1500) you can have the renesis making OVER 300 WHEEL HORSEPOWER and upper 200's in TQ. Thats quite an improvment from the stock rx8 that dynos around 180hp at the wheels and around 130 tq.....its a huge improvement.

Also cause the xinterceptor takes full control, the car cant lean out over time, so theres an extra saftynet.

I dont sell or make any money from the xinterceptor......i talk about it a lot casue its just that good!!!

 

[KYLiquid]

why would it be on race gas most kits are meant to run on premium - 93 so really why would they dyno that s*** with race gas.

almost any highperformance car can make extra power running on (edit, said pump, mean to say race) race gas....IF ITS TUNED FOR IT.

Its not uncommon for people to tune a car for pump gas 91/93 to see how much power they can safely make, then tune the car with another map for race gas.

Running race gas lets you run more timing advance and more boost safely, so you can make more power.

Although its not unheard of to find people that drive a car all the time on race gas, its uncommon.

Most people will have multiple fuel/timing 'maps' for their cars, so they have 1 for pump gas and daily driving, and another for race gas, going to the track or street racing or whatever. They put some race gas in the car and load the high power map.

You can pick up 30+whp on some cars by running race gas and tuning the car for it.

Here at work we sell c16 (117 octane) and ive seen cars make loads more power when tuned for that vs 93 pump gas.

 

[ZoomZoomH]

*looks in pocket*

nope, no $5000 in here

 

[KYLiquid]

*looks in pocket*

nope, no $5000 in here

tell me abou it

 

[Signal 2]

*looks in pocket*

nope, no $5000 in here

LOL, tell us both about it. One reason I'm still driving a 13 year old car. A couple of others are two kids to put through college.

 

[Captain KRM P5]

nothing wrong with a well kept 93 FD

 

[ChopstickHero]