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Originally Posted by OldDartmouthMark
Very interesting post. Some surprising revelations, at least to me.
My thoughts/questions:
- Why are they only able to do one hot lap, as the battery doesn't deplete until 6-8 laps? My impression was that you'd be able to drive them flat out until there was no charge remaining.
- Though I realize that a road course is hard on brakes, especially when you don't have a manual transmission to help engine compression take some load off the brakes to slow the car down (in an IC car), my impression was that an EV would go into regen mode on braking thus taking some load off the brakes. Or are the brakes just not that good on them?
- How long is the track? 2.5 mi? (Sonoma?) If so, does that mean with hard use that some Teslas only get like 20 miles of range? Or maybe I'm misreading it?
It's fascinating to read some of these experiences that you normally don't hear about for one reason or another.
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Some comments from the Tesla owners:
"the car pills power when the battery drops below a certain percent"
"You can run 15 minutes if you want, just head to the supercharger after the session. Problem isn’t the battery, your brakes will be done if you do that many hot laps. Obviously the faster you go, less laps you do. I burn about 10% juice per lap, I could get up 7-8 laps in theory."
"Optimum power will only last 1 lap"
"Started at full battery and ended at 60%. You'll see the battery temp display goes to red by the 5th lap."
"I only do one flying lap because as voltage drops, power does too. Trying to set the fastest time possible, so staying out for longer isn't really worthwhile for our goals. But for reference, on a slow out lap, fast flyer, and medium speed cool down lap, I use 15-18% battery. So if you're really cooking, I'd expect a flat out limit of 6 to 8 laps on a 2 minute track. Great time trial cars, but the technology and charging infrastructure is not suited for longer racing applications yet (at least when it comes at a reasonable price to the general public)"
So it seems like the battery/power gets spent if you drive all out for one lap. Soon, within a few laps, overheating batteries become an issue, in you're not limited by brake wear and overheating first. I think the OEM brakes just aren't good enough. Despite the Performance moniker, these cars aren't really suitable for true performance driving other than a limited number of acceleration runs.
Here's a lap at Sonoma, which is 2.52 miles.
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