Potential issues for hot upcoming track day?

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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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

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.

Eighties Meta

Well this seems pretty evident at the dragstrip. Oil temp in the 160-200 range car runs from 12.9 to 13.1 like clockwork. Above 200 it starts to get progressively slower. Slower I ever recorded was 220 oil temp running 13.5s at a significantly reduced 104 trap. Granted boiling hot outside it was high 90s. If this is true at the strip I imagine it would be present on track to a degree but at least on track you have constant airflow. Ill have to start tracking timing as well.

It is odd though as on my two track days I havent had a decrease in performance that I could notice whereas at the strip its easy to notice. Interesting though

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clintfocus

Yeah i was talking about th engine parameter logs, ive done it a few times with my car just to get water temps, but havent really recorded everything else. I could if i had to. I get what you're saying though about your track telelmetry logs. BTW what data logger are you using?

Again though, wasnt saying "run higher octane and solid cooling for optimum lap time performance". I said run it so you have that extra over head of engine safety. The potential added performance would just be a bonus. I dont run the extra octane for the speed, i run it for that extra protection against detonation/pre ignition.

cossie1600

I have used torque to log engine parameters via the OBDII port, but I really have no use for anything outside of RPM and maybe water temp for reference. To me it is a hassle to have a plug in between my legs, especially at the track. As I said, some of you are more into the engine/HP/tuning aspect than driving. I completely understand as I was like that 10 years ago. I just got past it and I really don't care about my engine unless it is smoking or Minis and Miatas are passing me.

I understand why you are using the high octane gas, I am simply saying it is an overkill on a stock car as the ECU SHOULD account for any possible detonation you MIGHT experience. And this is if your engine is really knocking that is. Also the effect of oil temp is greatly exaggerated in my opinion, I simply don't "feel" the same thing that you guys are doing. See what I am attaching below to support my claim. Do you guys carry 10x more in insurance coverage than your net worth too?

I have pulled the logs from my first lap and the last lap of the same session for comparison. Unless I missed something, I just don't see any HUGE drop in performance between both runs. A few horsepower maybe, but nothing so out of ordinary that would allow Miatas to pass me on the track. Even if you are right and my car is losing power from the heat, remember other cars on the track are running in the same condition too. Chances are that they will lose power if you do. BTW, I do back down every now in order to cool the engine/brakes/transmission/myself, but oil temp can climb from 220 to 260 within half a lap under full load. On a hot day, it got to nearly 280 at the end of the lap.











I would definitely be sought after by the courts for child support if I crash my car at the track

Sh0velMan

Anyway, OP, I would avoid tracking the car before a re-tune if you put LTH on it. That said, the FI LTH are pretty conservative, so you'll probably be alright as long as you give the car time to cool down after a few laps.

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clintfocus

cool data

well looks like you will continue to do what you're doing and ill continue to be paranoid. the OP can take the info as he pleases

cossie1600

We can wait for a recall like the steering lock too!

RN SHARK

Well, I went ahead and did it. Maybe I'll track this thing in August instead and just get my headers installed and tune the Z. There is another track day in beginning of September...

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