Potential issues for hot upcoming track day?

cossie1600

Very comfortable because I have been doing it for three years, motor is still original amazingly. I don't think I have used anything other than 93 octane either, so weird.

clintfocus

what's 93 octane :P

im sure your tone is tongue and cheek, at least im assuming so.

Alot of people dont run more octane then tuned for on track and depend on the Knock sensor and ECU to pull timing in the case of detonation, im just of the belief why even get to that point, hence i run more effective octane then what im tuned for.

Same with the Oil temps, yes ive hit 260 pre oil cooler, and yes 3 years later my motor is still kicking, but id much rather not be operating at over 240 degrees on track.

Another thing, depending on driving ability and chassis setup, the amount of wide open throttle and load on the engine per lap varies from owner to owner, less experience guys may not hit 250 oil temp till 8 laps in, more experience guys may hit the same temps 3-4 laps in. So there are more variables then what can be discussed on a forum. I guess if you're having fun and not getting towed home by AAA, you're ok

cossie1600

Have you ever monitor the difference in power output on the first lap of a session vs. the last lap with telemetry? I don't know about your car, but the difference in my car is marginal at best. I can easily match my top speed on lap 1 and the last lap even after accounting for how I come off the previous corner. I am not sure how much timing the ECU is pulling from the engine exactly. I am sure it pulled some due to the higher intake temp, but the actual difference in power is marginal at best. No way I buy into the whole knock sensor is sucking power out of the car BS, especially on a stock vehicle and the 370 especially. Racing gas is $6 or 7 bucks a gallon, I can spend the money on another track day.

I would be more worried about crashing than mechanical failures

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.

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