NT01 Hot Pressures

[Scootsmcgreggor]

Wondering what hot pressures people have found best for NT01's? I've read a lot about how our heavy cars need more pressure, and people quoting in the 35-36PSI range. 305/35/18 on an S550 and I found anything over ~33.5 psi was greasy and didn't feel good. Most of the guys I run with have lighter cars (S2k's, E46's, Miatas) and looked at me funny when I told them people recommended 34+ PSI for NT01's on our cars. Wouldn't the target hot pressure be more dictated by the tire than by the weight of the chassis? The other guys I run with all reported that 30-32psi hot for them worked best on NT01's. Thanks in advance.

 

[JAJ]

Wondering what hot pressures people have found best for NT01's? I've read a lot about how our heavy cars need more pressure, and people quoting in the 35-36PSI range. 305/35/18 on an S550 and I found anything over ~33.5 psi was greasy and didn't feel good. Most of the guys I run with have lighter cars (S2k's, E46's, Miatas) and looked at me funny when I told them people recommended 34+ PSI for NT01's on our cars. Wouldn't the target hot pressure be more dictated by the tire than by the weight of the chassis? The other guys I run with all reported that 30-32psi hot for them worked best on NT01's. Thanks in advance.

I ran them years ago on my S197 - essentially the same weight - at 32PSI hot.

 

[PaddyPrix]

So the answer is going to be unique to you.


Your mission, should you choose to accept it, is to get the wear line right on that triangle where the sidewall meets the outer tread edge as you are at temp.

If you're doing an HPDE day, do a handful of laps to where you feel that the car is warmed up, and then pull into the hot pits, if you can, or some place to quickly get out and check. You'll see where the tread starts to look all gummy and warm, and then where it is in relation to that is your sign. If you're an inch or half inch away, perhaps drop a psi. If you're over it, add air, but your goal is to get it to where the top of that tip meets the wear line hot, once you're right there, get your temp, and that's your hot number. You may find out that with things like high banked turns, or high g turns, that some sides of your car want more, and some want less, and that's totally normal. Some tracks are neutral -- whatever that number is for you, who knows.

As you come off and cool down between your session, take your pressures again, and that's more or less your cold starting point. Depending on the compound, car weight, other things like that, you will eventually find your normal growth rate, so for me it's about 8 for an R compound, 10-12 for a slick, so I'll go out cold at 24-26, depending on the tire. Perhaps you'll find out yours is 6, fair enough, then if going out at 26 gets you to 32 hot, and that line is right on that triangle, score, those are your magic numbers.

 

[ArizonaBOSS]

32ish hot for NT01s on an S197, from my prior experience.

 

[Stangra]

A great question! I'm very interested in the answer to this too and have been digging through a lot of threads to try and find it. I was told 36 hot by a Vette guy a couple of weeks ago, seems too high to me but... I haven't been able to find a solid consensus. I see a range of opinions from different folks, even found one that seems self contradictory. @ArizonaBOSS My appologies, I'm truly NOT trying to pick on you, In fact I regard you as a wealth of info, but I am confused. I see there's over 4 years between these 2 so maybe a memory thing?... or a typo?

Inquiring minds wanna know!

32ish hot for NT01s on an S197, from my prior experience.

NITTO NT01 vs HOOSIER R7

Has anybody used these back to back or had experience with them on the same car? Ultimate grip and track day life?

trackmustangsonline.com

30-32 cold, IMO.

 

[Scootsmcgreggor]

I’ve got two events on my first set now and they’re much better (less greasy second half of the session) so far at 31-32 psi hot. With -3.5 front camber and -2 rear they’re rolling onto the edge of the shoulder just about right. Will see how they continue to perform and wear and update this thread for any future readers.

 

[PaddyPrix]

If you look real carefully the tire, you'll see the edge where the rubber goes to the sidewall, and they've got some triangles set in there. As you do your first session, you'll see where the rubber starts to get all gooey, and makes a nice line. You kinda want that line going right at where the tip is pointing. If it's too far from it, chances are your pressure is too high, and the tire is ballooning, preventing it from using the whole tread. If it's too flat, or well past it, add some air, as it's too low and rolling. When you get pretty close to having your line run right through that triangle, find out what your tire pressure is, and that's your number. Depending on what you and your car weigh, that number could differ, for me it's 33#, but I likely weigh less than you.

(Yes, I'm ignoring the caster adjustments, and sure, using a pyrometer and measuring across would tell you for sure, but this trick works well enough.)

 

[racer47]

So the answer is going to be unique to you.

View attachment 72694
Your mission, should you choose to accept it, is to get the wear line right on that triangle where the sidewall meets the outer tread edge as you are at temp.

Those marks show where the treadwear indicators are. They are not roll indicators. They just happen to be in about the right location on some tires.

RE71R - Competition Tire Pressures - Track and Autoslalom

For those with RE71RsSo I am involved in both Regional Track and Autoslalom events and have been experimenting with different tire pressure setups this past season.I've always felt the need to run higher pressures for Autoslalom vs. track to take into account temperature increases during...

trackmustangsonline.com

On some tires they are much lower than others.

 

[PaddyPrix]

Those marks show where the treadwear indicators are. They are not roll indicators. They just happen to be in about the right location on some tires.

RE71R - Competition Tire Pressures - Track and Autoslalom

For those with RE71RsSo I am involved in both Regional Track and Autoslalom events and have been experimenting with different tire pressure setups this past season.I've always felt the need to run higher pressures for Autoslalom vs. track to take into account temperature increases during...

trackmustangsonline.com

Interesting. So you're supposed to use the circular dimples across the tread face, and then the triangles to measure the shoulder usage? I'm one of those to the cord kinda fellers.

edit-

 

[racer47]

There is a wear bar on the right tire, just to the left of the left green line (and to the right of the skinny white line), between your thumb and index finger. There will be a triangle on the sidewall inline with this. Its a DOT requirement to have wear bars and wear bar indicators. It has nothing to do with the sidewall wear.

The holes are extra, not required.

 

[PaddyPrix]

There is a wear bar on the right tire, just to the left of the green line, between your thumb and index finger. There will be a triangle on the sidewall inline with this. Its a DOT requirement to have wear bars and wear bar indicators. It has nothing to do with the sidewall wear.

The holes are extra, not required.

Learn something new. Knew about the wear bars, but couldn't find anything on the Nitto site about their suggested levels.

I guess depending on whether you think it's a derivative of the RR (https://www.toyotires.com/product/proxes-rr/) they suggest (and same for the RA1, RS1, etc):

• Operating Temperature: 160°F to 220°F
• Hot Inflation Pressures: High 30s to Low 40s (psi)
• Camber: -2.5° to -5.0°
• Caster: As much positive as possible

 

[Scootsmcgreggor]

40’s hot?!

 

[carver]

A great question! I'm very interested in the answer to this too and have been digging through a lot of threads to try and find it. I was told 36 hot by a Vette guy a couple of weeks ago, seems too high to me but... I haven't been able to find a solid consensus. I see a range of opinions from different folks, even found one that seems self contradictory. @ArizonaBOSS My appologies, I'm truly NOT trying to pick on you, In fact I regard you as a wealth of info, but I am confused. I see there's over 4 years between these 2 so maybe a memory thing?... or a typo?

Inquiring minds wanna know!

NITTO NT01 vs HOOSIER R7

Has anybody used these back to back or had experience with them on the same car? Ultimate grip and track day life?

trackmustangsonline.com

Try chalk on the sidewalls. You can easily see how much roll your getting.

 

[Drlee50]

Im with CARVER- I chalk em alot. Cold AM sessions are different than high noon vs 4pm sessions. Adjust as needed. Chalk helps make sure you are using the tire properly

 

[ArizonaBOSS]

A great question! I'm very interested in the answer to this too and have been digging through a lot of threads to try and find it. I was told 36 hot by a Vette guy a couple of weeks ago, seems too high to me but... I haven't been able to find a solid consensus. I see a range of opinions from different folks, even found one that seems self contradictory. @ArizonaBOSS My appologies, I'm truly NOT trying to pick on you, In fact I regard you as a wealth of info, but I am confused. I see there's over 4 years between these 2 so maybe a memory thing?... or a typo?

Inquiring minds wanna know!

NITTO NT01 vs HOOSIER R7

Has anybody used these back to back or had experience with them on the same car? Ultimate grip and track day life?

trackmustangsonline.com

Haha--good catch in the contradiction. I would still say 32ish hot, knowing what I know now. You can always go higher if you don't like it

 

[SMGDHG]

I've got roughly 60 sessions on NT01's and found 34psi hot was the sweet spot