Accelerometer data on Race Render

[jhammy49]

So, I am not real sure what to do with the data I have collected. At my last event, I struggled a lot with traction in all aspects of just about every turn. I say just about because two turns had concrete strips that follow the turn and I had amazing tracking in only those two turns.

Traction loss in braking
Understeer corner entry
Understeer mid corner
Understeer corner exit

This is very unusual for my setup and I am trying to see if there is anything in the data I can extract. I have a picture of the last 3 events I have done in racerender with data. I have the accelerometer data up as well and I just wondering if there is another way to parse this data (without looking at the excel file) that I am missing. Honestly im not even sure if the accelerometer data is from my obd2 sensor or the GPS. My GPS is the skyGPS. and its always facing the same direction because I have it mounted.

Left event I had good traction asphalt track CCW
Center event I had amazing traction on a cement track CCW
Right event I had terrible traction on the same track at the left but CW.

Screenshot racerender.png

[HoboBob]

Probably going to be difficult to compare "different" tracks simultaneously. You could look at Peak G-Force (under Enhanced Display Object category) to see what you had in various turns, but that will probably vary by speed. I find the 2D Graph options to be particularly helpful as well since you can see more of a moving average rather than just an instantaneous value, but I suppose you already have that for G-Force. Perhaps a Speed Graph would also help? Peak+Base Speed Banner would also give you a baseline for max/min speeds in the various turns. If you're consistently faster in the turns on the later sessions, then that could be the issue. If you're going the same speed but just have less grip, then it might be tire related.

Traction is tricky...the "exact same" setup including tires on the same track can yield different results depending on ambient temperature or heat-cycling on the tires or even something as simple as going into the corner an extra 5mph faster because you're getting consistently better drive out of the previous corner but not changing your braking point. I'd expect the last variable is not really the case since you mentioned it being consistent throughout the day (as opposed to a single session or single lap)...but a really hot day or starting tire pressures that are several psi higher could absolutely result in terminal understeer. Or perhaps even though the tires still have plenty of tread, they've heat cycled out and don't give the same grip as before (which is a problem on certain tires more than others; especially something long lasting like a RT660).

I'd recommend starting with just dropping pressures all around by 2ish psi and see it that helps at all. If you're still getting understeer even though it's a [relatively] cool day, then perhaps new tires would help?