My goal is to get around 400rwhp from the 6port engine but as I'm new to rx8s I have a few questions. .

1) Will the 6 speed manual transmission and the differential take the torque?

2) Can I use a stand alone ecu or must the factory ecu be retained. If I remove it will the warning lights/gauges/speedo still operate?

3) What cc are the factory fuel injectors?

4) Has anyone replaced the fly by wire with a manual cable?

5) Can the power steering be removed (like the FDs) or is there a manual rack available?

6) Is there a high-flow intercooler available designed specifically for the RX8?

7) Is there anything specific to turbocharging the RX8 I should know about aside from the 10:1 compression?

At this stage I would like the engine to remain stock.

Thankyou for reading.

 

Welcome and good to have you here!

Answers-

1) Probably not.
2) Yes, yes, and yes.
3) 290, 380 and 380, per rotor.
4) The answers to all these questions are freely available here,
having been answered every week since the car was released, in 2003.
Please consult the FAQ sections before you go any further.....

(I really like question 7!)

S

 

7) Have 6-7k$ set aside incase your motor goes booom


Well' im sure you could do it for less with a used motor self installed.

 

Just talk to scott (mazsportscott) or betsy (mazsportmantis). They have 4 400whp turbo kits. Just go into the mazsport vendor section and read the threads about each turbo kit.
https://www.rx8club.com/mazsport-104/

 

6) Just make your own intercooler. Threadstone.

It'd be cheaper to just do an FD swap meng.

 

I doubt it. The engine might be 3k but then you have to do a custom turbo kit to fit and thats a few more thousand plus engine management and custom motor mounts and other misc stuff and labor on top of it all. The price would add up quick.

 

So would a standalone ecu and all the other **** he wants.

 

Step 1: remove contents from glovebox

Step 2: cram full of $100 dollar bills until it barely shuts

Step 3: drop car off at mazsport

That's basically it. Converting to manual steering and manual throttle not required.

I wonder what a ported renesis could do with a mazsport turbo setup?

 

How about a set of S6 rotors machined to fit ,dowell it ,port it ,strap on a GT42R and vwalla 500HP at 15psi

 

Ciao would know, he's been there !

S

 

Patience Grasshopper .........Soon

 

Very true. Like mazdamaniac says being broke and tuning your car are not mutually exclusive. Fast, relaible, cheap... Pick 2

 

your best bet for a reliable 400whp is to talk to scott at mazsport and have him build you a one-off version of the turbo kit with a .96 hot side. the hotside it comes with is great, but might choke it out just a bit at 400+whp.

after that, just the normal fuel system and ecu upgrades, etc... i'd probably do 6 720cc injectors, denso fuel pump, regulator, interceptor, etc...

tranny will live if you avoid hard launching and take it easy on the shifts.

if you use an ems, you can ditch the drive-by-wire, but if you do get an ems that controls it, there's no reason to.

 

I still have serious concerns with the longterm reliability of the S6 rotors in a Renesis. I'd be watching the side seals very closely.

 

I wholeheartedly agree!!

Paul.

 

when he said machined to fit, i think he meant machined to accept the new side seals. i've talked to a few shops about doing that.

 

I still have serious concerns about that. It makes me very nervous.

 

eh, worth trying anyway. if it blows up, oh well...try something else

 

It's always worth trying.........on somebody else's car.

 

Some of us actually find that you get the most value out of trying stuff on our own cars. If it fails... Well, at least you'll know for sure if it doesn't work. No pain no gain I say, you wanna do it? Go for it.

 

That's a VERY expensive pain when it fails! I'm known to dump money on experiments but not potentially thousands on something that has a good chance of failing.

 

Thankyou for the fast replys.

I don't want to be opening the engine at this stage so FD rotors are not an option, and I also have doubts about the sideseals.

I'm in New Zealand so I can't go see Mazsport and after reading about their products it appears the 400hp kit is not yet available?

The reason I want to remove the fly by wire is to use a Microtech computer which can't run the FBW. It can't run the OMP either but thats easy enough to modify for manual control.
Unless someone can suggest an ECU more suited to the RX8?

I can fabricate an intercooler no problem but I don't know enough about end tank design so I would rather buy a properly designed unit from a well known company.

I will only remove the power steer if I have to but I thought I should ask now before I start.

Stealth - can you please clarify your first post, did you mean the factory ecu must be retained no matter what?

I should mention that I will be doing this for a customer and money is not really an issue here.

Thanks again.

 

The new ecu does not need to control drive by wire. You leave the stock ecu in place. You just disconnect it from the injectors. You also disconnect the factory coils from the stock ecu but leave the ignition pickup wire hooked up. You wire in the new ecu to control the injectors and the ignition. It works. You do not need to remove power steering or anything else.

 

i'd just email scott and tell him what you're doing. their kit + bigger turbine housing and injectors will land you an easy 400 as long as your octane can keep up with the compression ratio.

 

Hey RG another option to achieve the power is to do an entire swap with A S6/FD

Would that be difficult??Everything should fit .Use an intercepter and your done .....