adrock3217

You do realize that side port exhaust is ideal for NA, right? :-D Why do you think mazda went through all the trouble?

With intake an exhaust, you might be making 160rwhp, if that. In a 2700 (or so) lb car. The RX8, with intake and exhaust, while seeing very minimal gains from both, is making around 190-200rwhp, no matter what the dyno says. This is in a car around 3000lb, with much better (for NA) gearing, and a much higher geared differential..

The odds are stacked against you. I stand by my driver error comment, or unhealthy engine, etc..

classicauto

iTrader: (3)

+1 RX-8's are a decent run for a stock/close to stock TII.

There's local 8 owners with 14.8 and 14.6 second 1/4 mile time slips in their glove boxes......how many of those are in your N/A FC?

They're a stout little car.

Digi7ech

iTrader: (1)

Buy a turbo Rx7 and do basic upgrades.

Converting to a TII takes too much time and money. Easier to just get a TII.

I know....

mazdadude7

iTrader: (4)

i would love to just buy a turbo but i cant find a nice one? all of the ones i find have been modded in all the wrong ways i would like to get one thats stock and start from there. but i did talk to atkins on a trade out for my old 12at engine and a 20b so might go the insane route

papiogxl

iTrader: (6)

But where is the fun in that?

ericgrau

iTrader: (1)

Mazda switched to side port to improve emissions. The RX-8's emissions are 5-10 times lower than the FD. Though I think a side port might also allow a larger port.

You can come pretty close to the RX-8's power with a street port, high compression rotors balanced to handle 9000rpm, a full exhaust and nice tuning. Which is basically what the RX-8 comes with stock. You can't really upgrade an RX-8 without putting a supercharger on it.

Really, that's to your advantage: she can't upgrade and your car is lighter. RX-8 is 2900lbs., RX-7 is 2700lbs. That means you'll be faster in the end. So you can either upgrade yours like crazy or get a turbo.

RotaMan99

They did that for emmisions and fuel economy. I saw a diagram of how the side exhaust port is supposed to work. The unburnt fuel passes by it so it can be burnt up in the next combustion cycle.

ericgrau

iTrader: (1)

Well, more for emissions. Less than 130ppm of unburnt fuel (the California legal smog limit) isn't worth saving for mpg. Fuel economy in the RX-8 hasn't really improved. Really I think Mazda spent the emissions and mpg improvements to tune for even more power without breaking the law.

Digi7ech

iTrader: (1)

plenty. See my project daily drifter for an example of butt loads of fun.

I personnaly think the drivetrain is the biggest PITA to replace so why do it when you can get a TII chassis?

adrock3217

Er, aside from emissions purposes, this exhaust setup is superior to the old Peri style. Have you ever seen the valves on a piston engine? The intake is bigger than the exhaust, as this is the best for promoting better flow and power.

Whatever performance gains you can make with your FC (street port, full exhaust, tuning) can all be done on the RX8 as well. The end result will always be higher than that of the FC because of the side port design, and 10:1 rotors. Yes, you can mill the RX8 rotors to work in an FC, but at that point, why not just go turbo? It's cheaper.

Streetports on RX8's have been shown to give 10-20rwhp gain. Only 1 or 2 people have actually done it, as far as I know, as the engines are still so new to enthusiasts. A RX8 with a mid-pipe and cat-back, with a cold air intake, will make 190-200rwhp. With a streetport, add 10-20 to that. With a header (this is highly untested) you could see even more. With a STANDALONE, with the ability to tune, you could see much, much more.

TeamRX8 has already seen 215whp on a Mustang dyno, which translates to 225-230whp on a DynoJet. That is WITHOUT any internal (read: streetport) modifications, and is also with a tune that was made as a "base", untune-able map. With fine tuning and a streetport, it's quite obvious the numbers can only go up.

And then?


Edited to say: WOW, Supercharger. You do realize the supercharger kit from Pettit JUST came out. Greddy's turbocharger kit has been out for years, Mazsport has their turbo kits making 400 wheel, and so on..You say the only real way to make power with an RX8 is to "supercharge" it -- well, I've given you examples of how to make power without supercharging it, and the end result is the same as the FC. If you want to make REAL power, you have to go turbo. However, I don't consider 30-50whp over stock a small gain for an NA RX8.