Which exhaust for my RX-8

[Trueshot]

Hey i just recently got a nice white on black RX-8 i was hopeing to get a nice exhaust for it but have no idea which is my best bet for sound and performence wise.....and is there any other small performence parts i can add to the rotory?

[Gotian]

Originally Posted by Trueshot

Hey i just recently got a nice white on black RX-8 i was hopeing to get a nice exhaust for it but have no idea which is my best bet for sound and performence wise.....and is there any other small performence parts i can add to the rotory?

don't bother with an exhaust, they dont add horsepower only sound. if you want real performance that isnt something big like a turbo, supercharger, or nitrious, then your best bet would be a flywheel, it lets you rev alot faster and smoother and it will free up alot more power. Don't bother with an intake or exhaust due to the fact that the stock set-up is very well designed and isn't restrictive at all, some people even lose power with a CAI. The only reason to get an exhaust is if you have a turbo or supercharger set up, other than that stay stock and learn to drive the car by taking it to autocrosses and road courses.

[6dmnbag]

wait a second. Getting a different exhaust would not be too benifical even if you got a less restrictive muffler and bigger piping. But to gain 12 hp and deeper exhaust note, get rid of your cat and resonator, pipe is only 150 and even for stock its a small difference. You could also get light weight pulley'
s from unorthadox along with a flywheel, get high grade transmission fluid from royal purpel or redline and look into a trottle body spacer and an intake, cold air or ram air. One thing by itself is nothing special but if you put all those things together then you would have a nice car.

[Gotian]

Originally Posted by 6dmnbag

wait a second. Getting a different exhaust would not be too benifical even if you got a less restrictive muffler and bigger piping. But to gain 12 hp and deeper exhaust note, get rid of your cat and resonator, pipe is only 150 and even for stock its a small difference. You could also get light weight pulley'
s from unorthadox along with a flywheel, get high grade transmission fluid from royal purpel or redline and look into a trottle body spacer and an intake, cold air or ram air. One thing by itself is nothing special but if you put all those things together then you would have a nice car.

The biggest gain would be from getting a mid-pipe and a lightweight flywheel. Pullies would be more problems than its worth. But as I said before you shouldnt get an exhaust, it would be better to keep the stock exhaust and drop in a mid-pipe which removes the cat.

[Frag_dude]

I wouldn't rule out a ram air intake or a performance cat back exhaust so quickly. With an rx8 its hard to squeeze out power, so personally I would take whatever i could get. But with just an intake and an exhaust one wouldn't get much more than a better exhaust note (a lot better exhaust note and maybe some flames).

I also don't think that lightweight pulleys are more hassel than they are worth. They run under the same basic principle as a light weight fly wheel: reduction in rotational mass. Just make sure the set you get don't underdrive too much.

As far as a turbo, supercharger, or nitrous well....

If you plan on driving the car and hitting the redline often, don't expect it too last too long while its under boost from one of the few turbo kits out there.

Supercharger? i don't think there is a supercharger kit for the rx-8, but i could be wrong. If i was, then it goes under the same category as a turbocharger. Hell on the apex seals.

Nitrous...now theres an idea for a rotary engine. Inject a cold gas into the combustion chamger and f*ck up the apex seals so you have to replace them ever 10k miles. Congrats man, your off to a great start.

Personally what I would do to my car is the following:
K&N typhoon intake (I have it, I like the sound and its by K&N which to me is a plus, good name recognition)
Rotary Performance Fast Cat high flow catalytic converter (so I could still pass emissions)
Borla cat-back exhaust (not the most powerful exhaust out there, but I like the sound and look of it)
Unorthodox pulleys
Racing Beat fly wheel
and a Racing Beat ECU Reflash
Don't bother with looking for aftermarket headers. There are some in Japan, but as previously stated, this part of the exhaust is very well optimised. Max gains I've heard of were 4hp.

[Gotian]

Originally Posted by Frag_dude

I wouldn't rule out a ram air intake or a performance cat back exhaust so quickly. With an rx8 its hard to squeeze out power, so personally I would take whatever i could get. But with just an intake and an exhaust one wouldn't get much more than a better exhaust note (a lot better exhaust note and maybe some flames).

I also don't think that lightweight pulleys are more hassel than they are worth. They run under the same basic principle as a light weight fly wheel: reduction in rotational mass. Just make sure the set you get don't underdrive too much.

As far as a turbo, supercharger, or nitrous well....

If you plan on driving the car and hitting the redline often, don't expect it too last too long while its under boost from one of the few turbo kits out there.

Supercharger? i don't think there is a supercharger kit for the rx-8, but i could be wrong. If i was, then it goes under the same category as a turbocharger. Hell on the apex seals.

Nitrous...now theres an idea for a rotary engine. Inject a cold gas into the combustion chamger and f*ck up the apex seals so you have to replace them ever 10k miles. Congrats man, your off to a great start.

Personally what I would do to my car is the following:
K&N typhoon intake (I have it, I like the sound and its by K&N which to me is a plus, good name recognition)
Rotary Performance Fast Cat high flow catalytic converter (so I could still pass emissions)
Borla cat-back exhaust (not the most powerful exhaust out there, but I like the sound and look of it)
Unorthodox pulleys
Racing Beat fly wheel
and a Racing Beat ECU Reflash
Don't bother with looking for aftermarket headers. There are some in Japan, but as previously stated, this part of the exhaust is very well optimised. Max gains I've heard of were 4hp.

Goddamn man you have no idea what you are talking about, if you go f/i you would definately be able to redline all you want, you are supposed to! If you dont redlie this car you get a carbon build up which would destroy your engine. the apex seal wont go out because this isnt the FD we have much strong seals.

And yes there is a supercharger out there made by pettit racing and it is very reliable and lets you keep the stock feel of the car. Why dont you stop going by what youve heard on do some actual research yourself.

[Frag_dude]

Go ahead, boost your car. Call me up when you have to replace it. The compression ratio is way to high on the engine to deal with the extra boost.

Throughout history, when a manufacturer has boosted one of their cars, the compression ratio has been lowered to handle the boost with a certain degree of reliability. Thats one of the reason the greddy kis was so unpopular. People kept blowing their engines.

[Gotian]

Originally Posted by Frag_dude

Go ahead, boost your car. Call me up when you have to replace it. The compression ratio is way to high on the engine to deal with the extra boost.

Throughout history, when a manufacturer has boosted one of their cars, the compression ratio has been lowered to handle the boost with a certain degree of reliability. Thats one of the reason the greddy kis was so unpopular. People kept blowing their engines.

Rotaries dont follow the same rules of compression, if you would do research you would see why. Also the reason why the greddy kit was unpopular was because the management system that comes with it sucks, it would try to completely overide the ECU and the ECU would fight to regain control whic in turn led to the cars blowing the engines, but if you replaced it with the Interceptor-X or Canzoomer you wouldnt have a single problem. When you go F/I Its about tuning, bad tuning leads to blown motors, you can have a car that is tuned extremely well and it will out last you.

There are many many people who have boosted their cars and have done extremely well with reliablity. the Guys who made the supercharger kits have had the supercharger on their 8 for about 60k miles now with no problems. Sounds good to me. The only reason why the compression is high in the rx-8 is for emmissions, But raising or lowering the compression doesnt do jack shit for the RX-8. Like I said do some research cause if you base a rotary on what you know from piston engines then shit yeah you are going to blow your motor. It is very different and should definately be treated differently, so as I said before sell you car and go get yourself a V-8 since that is they type of person you seem to be.

[Frag_dude]

No need to get foul here man.

But as far as emissions and compression is concerned. To control emissions levels mazda allowed the gasses to be laid away and burned in the next combustion cycle.

Saying that compression ratio doesn't matter to a rotary engine and also has nothign to do with the power and that doesn't need to be changed is completely wrong. With the FC mazda rx7, why was the turbo compression ration lowerd to 9.0:1 from 9.7:1?

As long there is internal combustion going on, compression ratios will always matter.

And, just to make you happy, I am trying to sell the car. But it seems as though no on wants to buy rx8s anymore...

[Gotian]

Fine but saying that you will blow your motor is wrong. why dont you read the reason why thier motor blows, it isnt because of going with forced induction its due to the poor management system they have on the car.

You don't need to lower the compression if the kit is designed to work with the compression ratio on the car. would it help? maybe, to allow higher boost numbers but then you need to get new rotors because the compression is controlled by the rotors and then you need a new rotor housing and basically you need to rebuild you motor, for what? basically to run higher boost, so why not just get a bigger turbo like the other people do and tune for lower boost on a bigger turbo which gives you more power because it flows easier putting less strees on the turbo and motor aloowing for more reliability if the proper tuning is done.

There are plenty of people running kits on their 8 with absolutely no problems as long as the tuning is done properly. The people with the superchargers right now are running 8 pounds with the stock compression, stock internals, stock injectors (since the injectors are working, stock, at about 45% of their duty cycle.) and their are producing about 260-270 whp. They also manufactures a stage 3 kit (The previous one mentioned was a stage 2) that again works on stock injectors, stock compression, stock everything and is boosting 12 pounds that they have gotten 340whp out of it.

The guys over at mazsport have made 4 turbo kits all prodicing about 340whp, the only difference is where the turbo is located, and they all work on the stock set-up. Wanna know the reason why they work so well? Because they have been in developement for well over 3 years and they have found the most effective/ reliable tuning maps they could, where as greddy did a half assed job because they just wanted to release the kit and didnt do any research and instead based their design off the kits they had for the FD cause they were like "Oh its a 13b same crap" wrong, one is a 13b-REW which is the FD and the other is the renesis, 2 different engines there!

[6dmnbag]

I have a turbo and I wouldnt say I have no problems, like in the beginning of the year I got three speeding tickets in two months and that problem was caused by the turbo. Also when I pull up to the local ricers in the area at a stop light and they here my bov they always rev their engines, that is also caused by the turbo. As far as mechanical problems I had an oil leak where the oil feed line connects to the block because of the vibration from the motor and thats about it. If you ask me, forced induction is good if your willing to do it right and not half ass it.

[Gotian]

Originally Posted by 6dmnbag

I have a turbo and I wouldnt say I have no problems, like in the beginning of the year I got three speeding tickets in two months and that problem was caused by the turbo. Also when I pull up to the local ricers in the area at a stop light and they here my bov they always rev their engines, that is also caused by the turbo. As far as mechanical problems I had an oil leak where the oil feed line connects to the block because of the vibration from the motor and thats about it. If you ask me, forced induction is good if your willing to do it right and not half ass it.

exactly, F/I is only as good as you tune/management system