Potential issues for hot upcoming track day?

clintfocus

i never said i can "feel" the difference in power, nor have a monitored the difference with telemetry. I dont bring it up as a performance advantage, its just a little extra insurance by raising the detonation threshold a bit.

Also, i didnt say fill up your tank on race fuel, i said mix in some so your over all effective octane is higher. I do about a 1/4 tank of 100 mixed with the 3/4 of 91 ill already have in the tank (since all be have out here in socal is primarily 91 octane and that is what my car was tuned on)

a few gallons of race fuel is not alot of money, and its a nice bit of extra safety. Ive done it with all my cars in the past, both my street cars that see track duty, and my past competition time attack car and because of this ie never ran into detonation related problems or failures

cossie1600

I am not saying there is anything wrong with what you are doing. I am just saying it's an overkill and god knows if it really helps. I guess placebo effect is a powerful thing. From my personal experience, the 370 had no notable drop in power from oil temp alone. I didn't get any notable drop in power, knock sensor sucking timing out of the car and other funny business that some of you guys were getting. Once again, my car is slow. It isn't fast enough to have half the problems that you guys are having.

Sh0velMan

Got any datalogs of a session? I'd love to look at them. Ones with RPM/Coolant Temp/Oil Temp/Ignition Advance/Intake Temp would give me enough data to really understand what's going on.

Just curious, that's all.

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cossie1600

I do have the logs, but not in the details that you are looking for as I don't log engine parameters. I care more about lap times than what the engine is doing. Even though I don't have engine parameters, what I do have is vehicle speed and track positioning. This is how I came to my conclusion. Let's pick a track like VIR as an example. Coming out of Oaktree, there is a 4000 ft backstretch where you basically go from 50mph to 130mph. I take my acceleration curve in that particular section on my outlap/lap 1 where my engine is "cold", I then overlay the same curve from laps later in the sessions (I did this to multiple sessions, not just one). If your theory is true about noticeable drop in power under high temps, I should see a significant drop in my acceleration curve in the laps near the end of the session. Yet in many sessions i have looked at, I just didn't see any big change. Oh yeah, before you say how you come off the previous corner can effect the speed. While that might be true, but the acceleration curve should still remain the same as you are accelerating from 50mph to 130mph. By looking at a general curve, you see an overall trend.

BTW, I understand this doesn't have F1 type of accuracy or Mythbuster type of accuracy, but it sure is more accurate than a buttdyno

I will put something together once my baby goes to bed tonight.

I have posted plenty of data and videos. You can find them on the web for sure as I post most of it. I even overlayed them on top of another if you need to see.

threeseventy

Yes OP the detonation caused by overlean running even without tracking causes even more heat and can cause long term damage. The power loss Clint (a sought after record-setting time attack driver and professional instructor) is debating with Cossie (Cossie) could be attributed to temperature-related less-than-optimal combustion, so you really have to retune the car right after a major modification like cat-eliminating LTH's.

clintfocus

if we both did data logs on track and compared them, it would tell the whole story, but i doubt you're willing to do that to prove you point that im just a paranoid weenie