besides anyone in japan and aaroncake, has anyone experimented with higher compression rotors for a turbo? Say, like, a s4 NA set of rotors? How do you think that would turn out? It seems aaron cake liked it, I havent checked up on it lately, did it blow up?

 

ok.

 

man i wish i knew...probably be a lot lower life expecttancy of the engine..thats all i can come up with

 

i think the main concern with high compression and turbo is detonation..

however personally im not familiar with detonation problems in rotary engines, so i can't really give you any extra information..

 

Rotary Performance in Dallas has done a few 400+ hp 3rd gens with high compression. The key is in tuning and knowing your limits. There is less room for mistakes though.

 

Whats the benefit? Less boost and more power?

 

Yea it would seem to me like tuning would be a key factor and any fuel under 93 octane would be out of the question to help prevent detonation.

 

Maybe 89-91 rotors (9.7:1) with an AquaMist setup... But detonation would be the main limiting factor in why most people wouldn't do this...

 

If you only intend to run low to moderate levels of boost and can tune the car, then detonation shouldn't be an issue. Just use good gas. Better low speed drivability. The turbo also seems to spool up quicker. Water injection systems are old antiquated bandaid systems that for some strange reason or another are still used by many people. If a car absolutely needs water injection then it either is being pushed beyond reasonable limits of the engine or the engine wasn't designed around the users goals for power. If someone wants high boost levels and super high power then I definitely wouldn't try to use high compression. No one ever mentions at what boost or horsepower level it wouldn't be safe. Maybe they wold only want 7 or 8 pounds of boost. A nonintercooled Paxton Supercharger on a 2nd gen produces 8 lbs and that is on high compression without a properly tuned setup. They are also slow as hell but the point about boost level and compression is made.

 

I was just joking about the water injection... Does Paxton still make those SC kits?
If so, do they make them for carb or FI?

 

Dont you want lower compression in order to run more boost safely?

 

Yes, higher comp= easier detonation
even high comp cars (like a vq maxima)
need higher octane gas to avoid detonation (no turbo)

 

The Paxton Kits were actually not sold by Paxton. At one point Design Engergy under their Mariah Motorsports name were selling them as modified by a gentleman named Nelson. He no longer makes these kits. They were supplied with pretty weak mounting components and the pulleys were too small. The supercharges would overspin. I don't know who but there was someone on the forum here who was fabricating all the mounting hardware for the Paxton supechargers. They are all designed to work on a factory fuel injected car. Althoug, you could make it work on a blow through type of carb setup it you know what your doing.

Yes, you generally do want lower compression to run higher boost safely. Depends on the fuel used a little. Race gas or Methanol can run higher levels more safely than pump gas.