Quote:
Originally Posted by glamcem
I understand but still doesn't give us enough information since there are many other factors (engine power, pad/rotor life, etc) that affect the lap times and tires alone cannot be held responsible for the overall lap times, especially when they don't heat cycle out and when the tests haven't been done consecutively
yes, take a look at this video, and listen closely after 3:38 mark
Jake I understand your points and agree with most of the things you mentioned here but I have to repeat; that sudden jump on IR temp readings for that specific corner where you see higher corner speed also backs my claim.. it looks like that relationship is pretty obvious, I am not judging the inaccuracy/accuracy of the sensors I am just comparing data horizontally
it looks like RE71Rs are great tires along with the Direzza ZII and RS3s many people so I agree with you on that 
, I was under the impression that you were not satisfied with the results hence the word "degradation" and since you said: " Blue session should have been noticeably faster than the other two sessionsWe simply were not developing the lateral load that we had been in previous sessions. The RE71Rs are still soft, and have about 4/32nds left (rough average). But the grip just isn't there." that is the thing though, we cannot tell the grip wasn't there by looking at the data in hand, especially when almost all the lines are identical..you might as well be reaching the limits of the RE71s since all those lines almost identical except a few places...and average corner speed hike on that 7500-8000 mark seems to be responsible for that (or combination with other factors I mentioned above)
In addition to that, we would expect the tires that don't heat cycle out perform better when tread is less , that's the exact reason why NT01s and many similar tires perform the best right before you see them corded or why people have their Toyo RA1s shaved.. now that totally is a different topic of course
Jake |
Regarding the Camaro video, they're exactly right. We're not using these IR sensors to establish pressure, but to measure tire temps and temp gradients dynamically. There's no replacement for actually measuring your tire pressures, and we do that every session. Lately we've been happy with 33 psi, and dropped it even lower than that for some super-hot sessions.
I think we can both agree the data is not conclusively in favor of excessively heat cycled tires. I guess the only solution is more testing.
Based on what we've been discussing, we'll probably run a few more sessions on the current tires.
Quote:
Originally Posted by glamcem
yes, I am aware of that but I am still not satisfied with my 10 hz external GPS receiver, both Qstarz and Dual XGPS 160 fail to give that kind of precision at corners..
I don't have any personal experience with Aim MXL2 but it seems like a solid option, no wonder why so many teams and TA cars I've seen have been using them.. it just costs too much |
Yep, we're not looking to do the dual 50 Hz antenna level of analysis with this car. We're chassis testing, not tire testing.
As far as the cost goes, you've got to remember that price doesn't come from the electronics near as much as it comes from the hardened case, mil-spec equivalent connectors, Raychem boots, etc. You can absolutely piece together the same sensors from Sparkfun or Adafruit and log everything with an Arduino or RPi, but it won't survive. I know you already know that, but I just wanted to emphasize that fact for anyone else reading this.