Zippy

So what would be the effective difference in a K16 based (low lag) Stage 7 turbos vs. K16 based turbos you were making from 1 1/2 years ago.

Kevin

It would be like comparing your big block to a small block non blown Chevy.. The Stage 7's will destroy a stock TT's bottom end.. My Stage 5's will bang out a consistant 1.5-1.6 bars.. These are considerably larger.. While many folks are running to GT30's and GT35, my goals are to stay with KKK components and to utilize the latest wheel technology. The wheel in the Stage 7 is in the K27 frame family.

Jean

Kevin, performancewise, how would you compare in one sentence your stage 7 to a GT35? No need for dyno runs or proven data, just an expert's opinion.

Kevin

Jean, the Stage 7 has a very fat and more of a broad map vs the 35's.. The 35's have large turbine wheels.. The torque shift is far to the right(35's).. When building and engineering the Stage 7's, my target was the 35's... (smile).. With the Zero clearance, it will develop more boost at very low RPM's..

Torags

Is that the compressor wheel that feeds the air. Does the metalurgy in that wheel run cooler? Is the shaft of that wheel the same size as stock (Can it be substituted)?

Kevin

Yes, that's the compressor side that feeds boost into the intake/engine. The compressor wheel runs cooler, however, since it is compressing air heat is generated. Many hybrid wheels have to have the bore sizes plugged and cnc'd to the correct shaft size..

Torags

Hybrid wheels as in Bimetal?

If yes, are the two metals compatable at different high temps(rates of expansion contraction - modulus of (i forget))

Kevin

Torags 99% of compressor wheels that are made are manufactured from high grade aluminum with silicone secret sauces. My Stage 4 consists of CNC'd forged billet aluminum (very lightweight), I also offer it in Titanium. The turbine wheel is manufactured out of inconel and fused to high grade steel for the actual shaft. Yes, it is the tricks of the trades that enable one to make all of this gel together.. Let alone balancing all of the components to withstand over 160K operation.. With my redline close to 8500 this turbo will be singing.. Literally with the zero clearance, it will definately have a high pitch tone..

Torags

I don't say this often...AWESOME.........

Thanks for the response.

omega

chevy

1AS

Very impressive Kevin. What will you do for gearing? Clearly, the standard ratios will be inappropriate for your engine. AS

Kevin

Alexander Thanks,. I have to admit, that gearbox work is the least favorite things for me to do.. I'm trying to purchase a GT3R box right now.. Like you said, stock ratio would be inappropriate.. I want to try to get some tall ratio's..

Jean

Kevin, during my search I found GT3 Cup gearboxes (that have taller 1st and 2nd. gear ratios), typically 3.15 and 2.0 ratios which are very appropriate for your car, these boxes have the same solid internals as the 993GT2 with shifter cable, add a GT differential and you should be fine. You might want to consider that. FWIW the GT3RS is the same as the GT3.

Gelatomonster

Kevin

I am very impressed with your mod and openness in sharing it to all of us.

The best of luck

Torags

I'll go out on a limb and say I think we all are. Keep us informed, if you can. Thanks.