What is the most powerfull rx8 (non turbo and non supercharged)

[mj2326]

Just out of interest i\'m wondering what is the most powerful (non turbo and non supercharged) rx8 out there after it\'s had a few mods done. Has anyone ever achieved 280bhp+ and if so what mods have been carried out. I still have a few things I want to do to mine then gonna get it rolling roaded and see how it performs.

[jpc]

From the US forums, the best NA seems to be 220 to the wheels and that takes a lot of money from the racing teams. Otherwise, intake/exhaust/mapping gets you to 200rwhp.

One UK guy I was email with about my mx5/renesis conversion claimed 269 engine bhp from the Renesis but this was for an offroad vehicle, everything custom, no cat.

The impression I get is that the RX8 engine is pretty well tuned from the factory and unless you go forced induction (or nitrous), the possible gains are very limited.

[shaunwil]

There was the pip did not too long ago that was a 3 rotor PP, ran around 450bhp. Although that isn\'t the stock engine !

The 13b in the Rx8 is very well tuned to start with !

Shaun

[jpc]

If that was the one in Banzai, I expect that was based on the 13B from the RX7 rather than the RX8 13B.

[mj2326]

so if i was to remove cat on mine this wouldn\'t count as its strictly not road legal?

[jpc]

so if i was to remove cat on mine this wouldn\'t count as its strictly not road legal?

Not legal is my understanding.

Have a look at http://www.rx8club.com/ for improvements to non-FI cars. (US site)

[mj2326]

think i\'ll do it anyway i think we pay too much tax for emissions and the fact that their not making the 8 anymore is a sad thing

[shaunwil]

If that was the one in Banzai, I expect that was based on the 13B from the RX7 rather than the RX8 13B.

Yes based on the rx7 13b, but there has been a renesis 20b built before and and used in an rx7. Carl built the engine if I remember rightly !

Shaun

[antnicuk]

our kit car with an rx8 engine made 251 fly on the stock original engine on reworx dyno which reads lower than most.  Just a decent set of headers and Motec Ecu

[mj2326]

Does anyone have the sports cat fitted and would reccommend this instead of the decat pipe for an increase in bhp

[Will66]

I\'ve got a high flow cat on mine, I don\'t think it makes significant power difference however the reduced silencing and increased flow make it sound gnarly.

[mj2326]

where abouts did you get your high flow cat from ive seen petit racing do one 420 plus vat

[Will66]

I got mine from the States but Pettit\'s one is the same.

[PhillipM]

There was the pip did not too long ago that was a 3 rotor PP, ran around 450bhp. Although that isn\'t the stock engine !

The 13b in the Rx8 is very well tuned to start with !

Shaun

268@9.2krpm :WaveBye

I can\'t see it getting much higher than that without serious internal work.
 In fact, the SII engine we\'re now running has a bit less peak power, just over 260, (but holds onto it for longer, so we\'re not too bothered, it\'s only done 1300 miles so it\'s probably a bit tight anyway)

[shaunwil]

Nice ! Is that at the wheels or the Flywheel ?

Shaun