In Roll race, for the stcok car, Which RPM should I change?
#21
#22
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400 extra RPMs above redline sounds a little dangerous. How much extra power is the motor putting out between 6700 and 7100? Do you need titanium valve springs to prevent floating at that RPM?
#23
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![](https://cimg1.ibsrv.net/gimg/www.jaguarforums.com-vbulletin/1024x507/jaguar_v8_s_racechip_supercharger_pulley_3cd9c604533a7a6f522643f7df181c4cbe6d8b21.png)
This is a 2014 V8 S composite chart over multiple days. The red line is the stock tune with a 6% upper pulley on 0W-20. The blue line is the same plus Racechip on 0W-40. In neither case does a late shift seem helpful.
My belief, which needs more research, is that the car was overheating and/or experiencing blow by with the pulley and pulling timing at high RPM. I went to 0W-40 for the next stage of boost which seems to have helped. The ambient temp was 96F on both days.
The same dyno has several Z06s at ~545 WHP.
Last edited by RacerX; 02-09-2020 at 12:22 PM.
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