Some of you may know I've been preparing to boost my 6speed/6 port automatic. well. I've researched for about one year the good and the bad. I want at least 260 rwhp

GREDDY TURBO SETUP.. I planned to do this with an upgraded turbo of some sort. I believe it would be fairly easy to get 260 rwhp. Wouldnt be very expensive either. But... i decided not to. the reason is, the turbo manifold. Every single turbo kit I've seen for the rx8 has an inferior manifold design. Im not talking about build quality. Im talking about the design. The problem is, the rear rotor housing in the rx8 is in a tight spot to say the least. The exhaust port has hardly any headroom. Even in stock form, those stock headers are not adequate in letting that rear housing breathe. My question to the guys that has had rebuilds.... Which apex seals broke 1st?? the seals on the rear rotor? or the front rotor? In my research it was majority of the rear rotor.
For a good example, look at Racing Beats header design and look what they did with the rear rotor runner. Look at how it is angled.

So in my opinion and research with a couple guys that build rotaries all day, I've decided to leave turbo alone until I see an adequate turbo manifold that lightens the burden for the rear rotor housing.

PETTIT SUPERCHARGER SETUP

im looking at $6000 right off the bat. I plan to install this kit myself but I plan to upgrade my radiator, injectors. etc.. you get the idea though.
I should be able to actually get 270-285 rwhp with the 8lb pulley and header back exhaust (maybe more).

This is not a turbo vs supercharger debate. Because there is nothing wrong with turbo. Its just that the kits that are available for the rx8 need better turbo manifold designs in my opinion.

What do ya'll think?? I need to narrow this down so i can get more power in this machine!

 

well if you're waiting for a new manifold design, don't hold your breath. you would be better off designing and building your own. if you dont feel like waiting get the SC.

 

If my 4 port a/t can get 260 rwhp then the 6 port a/t should have no trouble getting 270 rwhp.

 

well ive bit the bullet and I will go with the greddy setup.. in about a week i will order a garrett 3071r. after i recieve my greddy kit, i will have the new turbo fitted. I will be gettin new injectors in january. I hope to get about 315 whp. I plan to push about 12psi so we'll see.

 

have you ever thought about the esmeril kit?

 

Good luck, I'd love to see the process.

 

yeah thats actually the kit i want. but i'd have to use INT-X engine management and its not compatible with the 6port a/t (that I know of).

If I could use it with Cobb AP it would be a done deal.

 

i thought you can modify the esmeril to use the ap?

 

I'm of the opinion that anyone turboing/supercharging the 8 should budget in a rebuild within the first year .
Hopefully get the tune and supporting mods pretty much sorted before you go kaboom
Then at rebuild time get upgraded apex seals and pin the motor

 

^+1 on pinning the motor and I would def get some stronger seals. Esmeril has good ones and I know of others but they are more expensive.

I def see 300+whp but at what cost.
GL with the build

 

No one has tried it yet, but you could (In theory) replace the charge pipe that enters the throttle body with the MAF housing in the Esmeril kit with a 3.5" pipe and configure it with a blow-thru MAF. It will work like this, you MUST have screen before and after the MAF.

It wouldn't be difficult to do it, either, just find a 3.5" pipe the proper length, purchase a Denso style MAF flange, have it welded to the pipe, get some silicone transition couplers and you're done.

 

its dowel pinned with atkins apex seals. engine built by alamo rotary.. when these seals break im going ceramic


how ever much its going to cost me I will pay for. I forsee the $5500 range, maybe a little more

 

thats a very good idea.. I will ask tito at alamo rotary about that.

 

the turbo for the Esmeril is too big to be very practical for an MT Renesis let alone an auto .........

 

When you get her buttoned up come to a local mod day, we haven't met you yet. Personally I would go built motor and the Pettit but just because I am all turboed out. I also recommend addressing cooling (coolant and oil) if you want your motor to last any reasonable amount of time.

 

when do they have thoes?? I dont live in San Antonio, I just go when i need engine work. I have since moved to Jonesboro, AR, but if you let me kno ahead of time ill make a special trip.

as far as the boost, Pettit is having a shortage of superchargers. :-(

 

We have them a couple times a month, just check the Gulf Forum. That sux but good for Pettit I guess

 

well some say that they were having problems getting the blowers sourced out.. I would hate to see the superchargers gone for good

on the turbo side of thing, I just ordered my resonated midpipe, guages, and AEM intake(will be modified for the turbo kit)

Im taking my car next week to get decarbed (only has 9,000 miles on the engine)
But I want to be sure that my intake is clean before the turbo install

Im also about to get a "backup" motor built so when[I I blow this motor ill just drop a new one in. I dont really want to say a whole lot of what Im doing Id rather just show when its done. I will try to break some Renesis records (at least for a/t rx8's) I will push 12psi until my other motor is done being built. Then I will ATTEMPT 18-20 psi. Something probably will break or blow, but I will attempt it... not as a daily driver, but just on the dyno.

but for the turbo gurus..

Im pretty sure the 3071r will be way out of its efficiency range, but it will push out 20psi... will it?

 

freaklinkmusic do you have the greddy turbo kit already?

 

nope wont have it till the 1st week in january

 

hmmm let me know how this goes. Ive really been concidering the SC system. I have a 6 port AT as well and i wanna see what specs you get. Thanks.

 

I just got my Greddy kit.. and lil parts on the side..
And im hoping. To port my engine soon.. and buy extra one as well.
And I am 6port and a/t

 

I just got my Greddy kit.. and lil parts on the side..
And im hoping. To port my engine soon.. and buy extra one as well.
And I am 6port and a/t

 

the biggest reason of rear rotor blowing up is ... the way coolant flows.

check it.

 

also its sitting right next to the tranny. basically the rear rotor is f*cked