Spring rate too high?

[garudathree]

Low 2:xx is harder than you think
Need big slicks, power to get to 1:55. One of the best drivers I know has a Supra w 315 slicks, 800 turbo and all the aero, JRZ pro etc. he just went a 1:54 this fall. 1:48-1:50 is IMSA Times
1:55 is around 911 cup times. All w really good driver

The leaderboards don’t lie though, it shows where the clubsports are, same with the ZL1s

in '21 on VIR, Riley's Supra GT4s ran 1:55 and 2:00
same year at LRP, they ran 55.3 and 55.9

a stock power supra with aero and suspension on 200tw is 56.03

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[Rocksandblues]

The leaderboards don’t lie though, it shows where the clubsports are, same with the ZL1s

They def don’t lie about potential of a platform Plenty of club sports and ZL1 s way down the leaderboards too. At this level it is more about driver than the mods. On 275s and stock struts I am about max what the Supra at that level can do. Posted a 1:18.2 at summit main couple weeks ago. I look forward to mcs over the winter and then being able to run 295s on real suspension next season.

 

[GRGT4]

Low 2:xx is harder than you think
Need big slicks, power to get to 1:55. One of the best drivers I know has a Supra w 315 slicks, 800 turbo and all the aero, JRZ pro etc. he just went a 1:54 this fall. 1:48-1:50 is IMSA Times
1:55 is around 911 cup times. All w really good driver

I believe the fastest IMSA time for a Supra is a 1:54.2

The fastest pro GT4 Lap at VIR was a Supra in SRO @ 1:52.5

http://results.imsa.com/?season=23_2023&evvent=18_VIRginia+International+Raceway
https://www.gt4-america.com/results/2023/virginia-international-raceway/qual-2

 

[Rocksandblues]

I believe the fastest IMSA time for a Supra is a 1:54.2

The fastest pro GT4 Lap at VIR was a Supra in SRO @ 1:52.5

http://results.imsa.com/?season=23_2023&evvent=18_VIRginia+International+Raceway
https://www.gt4-america.com/results/2023/virginia-international-raceway/qual-2

 

[AndyK5]

Even with -3.7 camber my fronts look like this. I either need -4.5 camber or learn to drive.

 

[razorlab]

Even with -3.7 camber my fronts look like this. I either need -4.5 camber or learn to drive.

Looks like you are overdriving. Do you just pound on the car lap after lap? Also, from what I can see in the photo, the tire might be oversized for the wheel width, which won't help either.

Those Federals aren't helping either.

 

[AndyK5]

Looks like you are overdriving. Do you just pound on the car lap after lap? Also, from what I can see in the photo, the tire might be oversized for the wheel width, which won't help either.

Those Federals aren't helping either.

I do overdrive which is something I am actively trying to remedy. And I do pound on them lap after lap, no cooldowns.

As far as federals… their time came to an end

 

[Rocksandblues]

Looks like roll over to me.

 

[AndyK5]

Looks like roll over to me.

So more camber and more pressure?

Maybe I pushed it a bit hard on outlaps when the tires were cold. I track with bunch of a-holes who try to execute late brake passing on the outlap with yellow flag out...driving my "you know what, F you" gauge to max. Though this does not happen all the time but last 5 set of my tires ranging from GT Radial to RT 660 to Cup2 to Federals on cars ranging from GR86, GRC and Supra all wore like this.

 

[Rocksandblues]

So more camber and more pressure?

Maybe I pushed it a bit hard on outlaps when the tires were cold. I track with bunch of a-holes who try to execute late brake passing on the outlap with yellow flag out...driving my "you know what, F you" gauge to max. Though this does not happen all the time but last 5 set of my tires ranging from GT Radial to RT 660 to Cup2 to Federals on cars ranging from GR86, GRC and Supra all wore like this.

I am struggling to understand. My camber is only 2.7 and I drive as aggressively as anyone. My tires have always worn perfectly even. Maybe rotate once at 4/5 life of tires. have used goodyears, ao52, nankang. always start 27 cold and maintain 34/35 hot

When i push on cold track or tires i just push or drift more until up to temp and grip. Doesn;t destroy one edge?

size of tires and size of wheels?

 

[PaulFRDE]

I’m not answering the OP question but I always use this pic as reminder:
http://speed.academy/wp-content/uploads/2015/07/Suspension-Cheat-Sheet-06.jpg
Could also come from brake pads with too much friction in the rear.
I also agree you might need more pressure in front

 

[razorlab]

It’s not rollover, totally wrong part of the tire.
Camber and pressures good. 100% over driving the tire too hot and probably terminal understeer.

 

[FuzzyRev]

It’s not rollover, totally wrong part of the tire.
Camber and pressures good. 100% over driving the tire too hot and probably terminal understeer.

 

[AndyK5]

It’s not rollover, totally wrong part of the tire.
Camber and pressures good. 100% over driving the tire too hot and probably terminal understeer.

I am gonna die from understeer got it

It does make sense though, those tires battled understeer right until last track day where oversteer became a problem.

I also go a bit hooligan when I know I am done with a tire, last few laps of last session turns in to car control clinic.

 

[razorlab]

I am gonna die from understeer got it

It does make sense though, those tires battled understeer right until last track day where oversteer became a problem.

I also go a bit hooligan when I know I am done with a tire, last few laps of last session turns in to car control clinic.

Is this also from Buttonwillow? That track is hard on tires as well.

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