NT-01 20 Min HPDE track Session Hot Pressures?

[Mandi90TT]

What hot pressures should I be aiming for on 275 front 305 rear for 20 min HPDE sessions?

I've been on the track plenty of times, but not in my M4. Used to have a NASA time trial license, so I am not a track newbie, jumping back down to HPDE 3 with NASA this weekend because it has been a while since I was on a track and because this is the first time in the M. Also, first time with NT-01's, used to use R888 on my previous car.

[tchiers]

33-35 psi hot.

[M-Pilot]

So far I tried 32 hot and 34-35 hot. I definitely liked 34-35 hot better. I would say 34 hot all around is the sweet spot (at least for me).

[Mandi90TT]

Thanks, both of you

[DASm3]

37 hot on all 4

[coolmody]

I run 35-36 hot.

[CosmosMpower]

37 hot start at 32 cold then bleed down as needed

[CanAutM3]

I played around a fair bit until I got it right on my car. Varying pressures and taking readings with a pyrometer, I established that the ideal pressures for my setup and driving are at 42psi front and 31psi hot rear. I know, it is quite unusual to have that much front to rear difference, but that is what gives me the best results. At some point during my experimentation, I tried lower front pressures and I destroyed a pair of 275 in just three track days with both of them corded on the outer AND inner shoulders with plenty of tread left in the middle .

[Mandi90TT]

Thats.....a rather high front pressure. I understand what you are saying, but it still seems high

[Cajun1]

Originally Posted by CanAutM3

I played around a fair bit until I got it right on my car. Varying pressures and taking readings with a pyrometer, I established that the ideal pressures for my setup and driving are at 42psi front and 31psi hot rear. I know, it is quite unusual to have that much front to rear difference, but that is what gives me the best results. At some point during my experimentation, I tried lower front pressures and I destroyed a pair of 275 in just three track days with both of them corded on the outer AND inner shoulders with plenty of tread left in the middle .

Thanks and I'll be trying to apply this knowledge to my next day on the track.

[FlyingLow78]

Wow...I've only had four track days so far and was aiming for 40 psi hot, but seeing all of these lower pressures makes me think I might be giving up a lot of grip.

[Mandi90TT]

As a note, I found that 38 hot front, 36 hot rear worked best for me. Of course, that was only over 7 total sessions, 20 minutes each.

[Kbueno]

Originally Posted by Dave 90TT

As a note, I found that 38 hot front, 36 hot rear worked best for me. Of course, that was only over 7 total sessions, 20 minutes each.

Exact pressures for me as well...nice even wear across tire.

[adc]

Originally Posted by Dave 90TT

As a note, I found that 38 hot front, 36 hot rear worked best for me. Of course, that was only over 7 total sessions, 20 minutes each.

Yes I was using similar pressures as well. I'm on stock camber/suspension.