Quote:
Originally Posted by glamcem
Ok, I have to say that I didn't pay attention to the dates ..if these readings are taken on different days, temp/humidity differences alone would make up for the difference.. I see ~2 secs difference (in a 2 min lap) between my morning and afternoon sessions on a hot summer days .. of course my car is boosted so the fluctuations will also be higher but 7/10ths of a second difference is pretty normal so your driver is pretty consistent, indeed  |
Temperatures were measured across the track surface continually, and averaged across each session. The temperatures matched exactly, to within measurement error. All other environmental conditions were close enough we could not measure a difference.
Quote:
Originally Posted by glamcem
I should've said those IR temps look consistent in their inaccurate reading range  in other words you can still use them as a reference to compare two different readings but I am pretty sure they are far from being accurate ... my method of estimating the tire temps is simply looking at cold and hot pressures right after the session to see if the car hits the target pressures, if the tires are within the suggested camber specs and PSIs you're good.. |
I'm not sure I follow you here... You're saying you think it's more accurate to measure tire temp by going off of pressure readings before and after the session, than to measure tire temps realtime with industrial IR sensors?
Quote:
Originally Posted by glamcem
I don't have a source in hand but it's not really hard to guess that sliding/drifting will definitely increase the heat which will ultimately cause premature tire wear..you can search on Google and I am pretty sure it;s been discussed ..that's in fact the main reason it's easier to over heat street tires vs track tires, because of the harder compound on street tires they will slide easier and feel greasy because of that after a lap or two |
Keep in mind we're not talking about drifting here. We're talking about a slightly higher amount of slip angle, beyond the peak efficiency of the tire. There's a HUUUUUUUGE difference in drifting around a corner, and a few degrees extra of slip angle. I'm sure you understand the challenges and costs of measuring slip angle realtime, and why that's beyond the scope of this project. We're not testing tires here.
That being said, I'm still researching this behavior I'm seeing. I imagine slip angle vs. temperature is proprietary data that we're not going to find, but I'd like to know if this trend is backed by scientific testing anywhere. I'm not convinced the higher amount of slip is reason enough for the temperature difference. There's no additional energy being turned into noise, or smoke, or anything like that.
Quote:
Originally Posted by glamcem
I would suggest you to try NT01s (235/40/17s) especially if the car is still NA and slight strech with a 9" wheel.. I was very happy with my previous setup and wanted to try Z214s this time but I will most likely go back to that NT01s ..overheating also shouldn't be an issue with them,
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I appreciate the suggestion, but that would significantly cloud our comparisons. The RE71R is doing fine for our purposes so far, and changing compounds would more or less invalidate any of our previous tests.
Jake