Author Topic: What is the most powerfull rx8 (non turbo and non supercharged)  (Read 5048 times)

Offline mj2326

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What is the most powerfull rx8 (non turbo and non supercharged)
« on: October 12, 2010, 12:39:16 PM »
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.
Stratos blue 231 55 plate, Ecu yellowstuff pads and brakes all round, AEM cold air intake, Front cusco strut, Toyo sport exhaust, manifold and ECU remap, R Magic rear spoiler.

Offline jpc

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #1 on: October 12, 2010, 12:57:06 PM »
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.

Offline shaunwil

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #2 on: October 12, 2010, 12:59:50 PM »
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
1994 White FD with A-spec GT3574R - 358bhp at the hubs at 0.9bar :3gears-lh
2003 Mondeo 2lt 130ps Diesel Estate Daily :driving

Offline jpc

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #3 on: October 12, 2010, 01:02:19 PM »
If that was the one in Banzai, I expect that was based on the 13B from the RX7 rather than the RX8 13B.

Offline mj2326

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #4 on: October 12, 2010, 01:27:54 PM »
so if i was to remove cat on mine this wouldn\'t count as its strictly not road legal?
Stratos blue 231 55 plate, Ecu yellowstuff pads and brakes all round, AEM cold air intake, Front cusco strut, Toyo sport exhaust, manifold and ECU remap, R Magic rear spoiler.

Offline jpc

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #5 on: October 12, 2010, 02:22:39 PM »
Quote from: mj2326;720797
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)

Offline mj2326

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #6 on: October 12, 2010, 02:46:41 PM »
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
Stratos blue 231 55 plate, Ecu yellowstuff pads and brakes all round, AEM cold air intake, Front cusco strut, Toyo sport exhaust, manifold and ECU remap, R Magic rear spoiler.

Offline shaunwil

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #7 on: October 12, 2010, 04:57:24 PM »
Quote from: jpc;720787
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
1994 White FD with A-spec GT3574R - 358bhp at the hubs at 0.9bar :3gears-lh
2003 Mondeo 2lt 130ps Diesel Estate Daily :driving

Offline antnicuk

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #8 on: October 12, 2010, 05:35:10 PM »
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
400 BHP - 650 KG\'s = 616 BHP Per Ton of Rotary Power

That\'s the way to do it! :Thumbsup!


Offline mj2326

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #9 on: October 13, 2010, 10:36:15 AM »
Does anyone have the sports cat fitted and would reccommend this instead of the decat pipe for an increase in bhp
Stratos blue 231 55 plate, Ecu yellowstuff pads and brakes all round, AEM cold air intake, Front cusco strut, Toyo sport exhaust, manifold and ECU remap, R Magic rear spoiler.

Offline Will66

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #10 on: October 15, 2010, 06:55:17 PM »
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.
RX8 High Power, Cusco Coilovers, Dotz wheels and flames. Shoe Size 12
 
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Offline mj2326

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #11 on: October 19, 2010, 04:55:26 PM »
where abouts did you get your high flow cat from ive seen petit racing do one 420 plus vat
Stratos blue 231 55 plate, Ecu yellowstuff pads and brakes all round, AEM cold air intake, Front cusco strut, Toyo sport exhaust, manifold and ECU remap, R Magic rear spoiler.

Offline Will66

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #12 on: October 22, 2010, 12:30:44 PM »
I got mine from the States but Pettit\'s one is the same.
RX8 High Power, Cusco Coilovers, Dotz wheels and flames. Shoe Size 12
 
Apparently putting details of your car spec in your signature means the nice folks on exile-rotorsport think you\'re a fool.  I can think of no higher compliment!

"Eat it with a chopstick!"

Offline PhillipM

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #13 on: December 06, 2010, 12:42:57 PM »
Quote from: shaunwil;720786
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)

Offline shaunwil

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What is the most powerfull rx8 (non turbo and non supercharged)
« Reply #14 on: December 06, 2010, 07:29:06 PM »
Nice ! Is that at the wheels or the Flywheel ?

Shaun
1994 White FD with A-spec GT3574R - 358bhp at the hubs at 0.9bar :3gears-lh
2003 Mondeo 2lt 130ps Diesel Estate Daily :driving