staticlag

Whats the going rate for a healthy kidney?

army_rx8

80k isn't it? :p

army_rx8

my friend got the generic one for his evo and it only cost him 1300. i think on the dyno after it was tuned it added like 30-40 hp or somethign crazy like that, i forget it was a while ago (2 years). :D

Razz1

With the high compression of the 8, I don't think you'll see those type of HP numbers.
350 to 500.

Well at least not something that is reliable.

gr8rx

hmmm.........interesting. The standalone is the way to go to make good/reliable power, however the problem with that is that no-one has been able to address the issues with using a standalone, such as keeping tcs/dsc, throttle by wire, electric assist steering, just to name a few, and if/when I upgrade my car with a turbo set-up these "things" are important. If you can manage to go standalone, and use the pieces suggested then I see 6000-6500 as a good asking price. If you go standalone but lose all the factory systems stated previously, then the system doesnt justify the price

Red Devil

If all the factory systems are compromised - tcs, dsc, etc... - this would be a hard sell for most, I suspect.

That said, I think many of us have no issues with spending more money for a better quality kit, especially if the parts involved will allow for the possibility of building on more power later on down the road. The only question is whose kit is the best for such an application.

rx8pilot

true..but they do have lower compression rotors...someone wanting to go that big would obviously change them out. i think 500 is doable..and done right..could be quite reliable. you'd be surprised. time will tell..

yes..but like probably 75% or more on here..we turn off those systems anyways.. and anyone wanting 500 hp out of their 8 will not cry over losing those... although it would be nice to keep.. maybe they'll find a way later on to keep it all.

rotarygod

Yes there are lower compression rotors out there but they are for the 13B, not the Renesis.

Bindon

If they could develop them for the Rx-7, I assume that IF there is enough damand, developing low compression rotors shouldnt be a big issue for the 8

smrx8

iTrader: (1)

Is in everything a issue for the rx8 . Iam sure they will run into some problem

Fanman

Big "IF". The RX7 was a stock twin turbo car. Our cars are not. The numbers of turboed RX8's might sound like a lot, but is probably less than 1%-3% of all RX8's. Out of that who would buy lower compression rotors. Think the market would be minute. Don't know if it would justify the cost of R&D for something. Like I had commented before even on this turbo kit. At $7500-$8000 I just don't know if there is a business case for this.

rotarygod

No one developed low compression rotors for the RX-7. They wee on different model RX-7's. '86-'88 nonturbo RX-7's used 9.4:1 rotors, '89-'91 nonturbo RX-7's used 9.7:1 rotors. The '87-'88 Turbo II RX-7's had 8.5:1 rotors, the '89+ turbos used 9.0:1. No aftermarket company made them. It would not be cheap or easy for an aftermarket company to do so. In the past companies have machined higher comp rotors down to lower compression but the Renesis rotor castings are too thin to do this and still retain any strength. It looks like high compression will have to stay or we wait for the day Mazda makes lower ones.

BlueRenesis82

My question is at this stage in the game, why would someone rip out their factory rotors and go the low comp route? And if they are that hardcore about it, why not buy a 7 with a blown engine and build it from there?

DARKMAZ8

what about swapping the 4 port automatic motors into a manual and boosting that?

rx8pilot

and that means there'll never be low compression rotors for the 8 huh? hmmmm

rotarygod

The way the port configuration is setup on the different motors, the 4 port motor is almost the 6 port motor with the auxiliary ports closed full time in terms of port timing. They differ a little but are very close. The old 4 port 13B engines had very large secondary ports compared to the current 4 port engines. The 4 port Renesis engine has smaller exhaust ports than the 6 port though. The compression ratios are still the same between them.

rotarygod

Maybe one day. Maybe not. We'll just have to wait and see.

Bindon

Yeah, I see what you mean.

Ill just wait to get my hands on the 3 rotor renesis they used in the american le mans series :-D

rotarygod

They aren't using a 3 rotor Renesis. They are only referring to it as a Renesis because that is what the current rotary is known as. The 3 rotor race engine is an all peripheral port 20B. It uses Renesis ignition coils though.

zoom44

Racing Beat will do it for you butyou have to send them your rotors i believe.

Fanman

Lightened rotors, not lower compression. They will take .2 lbs. off the existing rotor.

http://www.racingbeat.com/FRmazda4.htm

rkostolni

I don't understand the big desire for lower compression rotors. Lower compression rotors means you can up the boost, but it takes more boost to make more hp. With higher compression rotors, you can use less boost to make the same hp. The effective compression of the engine will turn out to be the same, whether using 8:1 with 20psi or 10:1 with 15psi. Note, those are just numbers to illustrate and I do no claim the are mathematically correct, but you get the point.

Then with the lower comp rotors, you have to deal with soggy throttle response and low power when not in boost at low rpm's.

epitrochoid

how would a gt35r's power curve compare to a t66 or 62-1 with around 9psi peak boost?

Fanman

The reason why lower compression is supposed to work is that the increase in boost & hp is greater than the loss of hp by lowering the compression. i.e. if you lower the compression to 9:1 & lose say 20 hp, but are able to put another 5 lbs. of boost & gain 50 hp without detonation, then it makes sense. I have an article about this called "How much is compression worth" but it is for muscle cars. Nobody knows how ell low compression rotors would work & how far we can increase boost as nobody has done this on this car yet. Like you said it is all theoretical right now.

guitarjunkie28

a gt35r would probably be almost identical to a 62-1... they're very similar in flow.

i know the t66 is capable of a LOT more, but it too would probably do close to what the others do at 9psi...it's not efficient until the upper teens.