what about in addition to those things an e85 conversion and a bump in CR?ptuomov wrote: ↑Wed Aug 17, 2022 11:29 pmThe two turbine hot sides under consideration are K16 and K24. Both came factory stock with this car, the European S model getting the larger K24 hot side. The compressor wheel of K16 is too small, so staying with the K16 turbos would mean installing a K24 (or similar) compressor wheel. The compressor wheel itself isn’t a big factor in lag or transient response, turbine geometry is. Compressor wheel does to a large extent determine the peak hp, however.Fusion Works wrote: ↑Wed Aug 17, 2022 10:35 pm If you could find a 3.6,3.7, 3.8 final drive you could offset the drawbacks of larger turbos, bigger cams, etc. You can create more torque at the contact patch. Yes you will lose some top end, but the reality is, normal driving doesn't allow for speeds in excess of 150mph on a regular basis.
On the cams, I think that by increasing the duration by increasing overlap one can have one’s cake and eat it, too. This is because the increased overlap will in my opinion help across the whole rpm range above idle. The constraint here is passing the emissions at idle. Again, not planning to go overboard here, just the types of cams that the normally aspirated 993’s have. Like hydraulic 993 Euro RS emissions passing street car cams.
The third physical change would be a free-flow exhaust. Many wools say that reducing the flow restriction after turbo helps the turbo spool up. I don’t think this is true, because the mass flow of exhaust at say 2500 rpm is so low compared to 6500 rpm that I don’t see how the exhaust can be chocking off anything at 2500 rpm. Free flow turbo back exhaust will help the top end, though.
With these changes and the software calibration to complement them, I think one could add more power everywhere while keeping the lag at most at the factory S level and possibly better. The gearing changes might not be required.
also having the ability to spin the tires at any speed is something fast drivers like.....
its the drivers job to manipulate the throttle to maintain traction.