daveo4EV
Well-Known Member
- First Name
- David
- Joined
- Jan 28, 2019
- Threads
- 160
- Messages
- 5,812
- Reaction score
- 8,650
- Location
- Santa Cruz
- Vehicles
- Cayenne Hybrid, 911(s) GT3/Convertable
Now if I could run a Taycan from 100% battery down to say 7% or less at full pace for the entire SOC drain - that would equal more than 15 or 20 laps…we now might be getting close to some brake fade for steel brakes - but then we’d still have the hefty weight and greasy street tire problem - but yeah if I could run a battery ”dry” at full pace brake upgrades might start to be interesting. As it stands now battery thermal limit of 132F causing the vehicle to neuter power happens after about 5 full pace laps @ Laguna - which is about 100% SOC to 60% SOC - and then you need a 30 minute “rest” off track to recover the vehicle and the battery temperature.since my original posting I'm reminding the audience of this post from a while back
I've discussed this "insight" at length with many many track buddies, including a pro-racer who has extensive PCCB and non-PCCB track enduro and sprint race experience…everyone I've discussed this with is at first incredulous but after giving it more thought they have an "ah ha" moment and get a big smile and just shake their heads - realizing PCCB's are completely useless and un-necessary on a limited range EV. Some even burst out laughing once they realize how ridiculous it is. No one cares about brake fade for a 15-20 minute sprint race. And the Taycan can't even run long enough for a typical sprint race.
No vehicle will benefit from ceramic brake endurance thermals for a 10 lap race - and 10 laps at any track is more than the Taycan can do at full pace. And if you're saying "but but but weight savings"- I'll remind you of the Taycan's hefty 5100 lbs curb weight and refer you to greasy street tire problems in 4 laps or less given the Taycan's hefty weight - the PCCB weight savings in the context of 5,100 lbs curb weight vehicle are minimal at best.
PCCB's are 100% a waste on most cars but can be useful for track days where session times may exceed 20 or 30 minutes, but even under track circumstances for the Taycan they are still a waste given the Taycan's limited power/fuel capacity/battery thermal capacity - requiring a full 20-50 minute fast charging session in less than 10 laps at any track you'd find world wide. Porsche standard steel brakes are more than up to task to drive this vehicle hard for 15 minutes - about it's maximum hard driving endurance capacity before you'll run out of battery kWh's or battery thermals.
You can not run hard enough or long enough to need the additional thermal capacity for PCCB's and on the street due to Regen PCCB's are infrequently engaged.
You don't need PCCB's for two 15 minute track sessions a day before the car needs 30-60 minutes for a fast charge session (or several hours for non-fast charging) -during which your steel brakes will cool to ambient air temperature and be back to full thermal capacity - the steel brakes will be ready to go again long before the battery is cooled and charged, and the steel brakes will also outlast the battery on track, and outlast the tires.
I'm considering a Taycan CT for my wife's next vehicle - and I will not be spec'ing PCCB's - there is simply no point even for track usage - which is a stretch for a Taycan CT.
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