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Weird tyre wear... Diagnosis help please

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10 replies to this topic

#1
thehelix112

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Hey tyre gurus,

Please tell me what's up with these tyres. The wear looks all sorts of messed up. Like why are the inner 2 inches down to the belts but nowhere else is?

Context, tyres and wheels are OEM rears but running on the front.

They've done 1.5 track days at Buttonwillow and were new in Feb 2018 and have done 3500mi since new.

The alignment is from a local shop, maxed out front negative camber with OEM gear (so lower control arm adjusted full out).

Thanks,

Dave 0e4fee31714f71c1182959c99484507d.jpg82565818faa23730d369064870ecc1c5.jpgf5be38af40d0e016321199c1053684b1.jpg0f3e0f938fa58adf7234a923b752429a.jpg
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#2
7racer

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tire pressures?

 

looks like that can give you the weird middle part.

 

max camber could give you the inner


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In7anity!!


#3
elf_cruiser

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Too much toe in/out. Front should be set at 0 toe for track use. Your shop probably set some toe-in for better highway manners, which will burn up the inner edge when combined with lots of camber.
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2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

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Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#4
7racer

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Too much toe in/out. Front should be set at 0 toe for track use. Your shop probably set some toe-in for better highway manners, which will burn up the inner edge when combined with lots of camber.

 

 

Elf, what's your alignment now or what do you prefer?

 

I use to run a bit toe out for turn in (original recommendation from TSM for the OLOA set up) just curious


In7anity!!


#5
elf_cruiser

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Elf, what's your alignment now or what do you prefer?

I use to run a bit toe out for turn in (original recommendation from TSM for the OLOA set up) just curious


I’ve been doing my own alignment on the racecar for a couple of years now, playing with different setups. I have learned that the optimal setup differs from one track to the next so I’m always making changes before each weekend.

That said, here are some rough numbers that will get you in the ballpark for any track:

On street tires:
Front: -1.5 to -1.8 camber, 0 toe
Rear: -1 to -1.5 camber, .25” toe in

On Slicks:
Front: -3 to -4 camber, .125” toe out
Rear: -1.7 to -2 camber, .25” toe in

R compounds (Hoosier R7, NT01, R888) would fall somewhere in between.

I need to get a set of tire pyrometers and use them when the car comes off track. That’s the next step!
  • Enshiu, 7racer and droptopp like this

2010 GT-R - Matte Gray, AP/Carbotech, BSE trans cooler, BSE tune on ECUTek, H&R sways, AMSOIL, NASA-AZ TT2 and occasional DD
1976 FJ-40 Rock Buggy - tube chassis, LQ4, 700R4, NP205, Rockwells, F&R hydraulic steering, Fox, Ballistic, lots of 4130, 7068, and AR400

2001 Ford Excursion - V10, DD and occasional tow rig

facebook.com/DangerousEnterprises

Do want someday - Radical, 599 GTB w/FHP, 430 Scud, Superlite Coupe, FF Type 65 Coupe


#6
7racer

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I’ve been doing my own alignment on the racecar for a couple of years now, playing with different setups. I have learned that the optimal setup differs from one track to the next so I’m always making changes before each weekend.

That said, here are some rough numbers that will get you in the ballpark for any track:

On street tires:
Front: -1.5 to -1.8 camber, 0 toe
Rear: -1 to -1.5 camber, .25” toe in

On Slicks:
Front: -3 to -4 camber, .125” toe out
Rear: -1.7 to -2 camber, .25” toe in

R compounds (Hoosier R7, NT01, R888) would fall somewhere in between.

I need to get a set of tire pyrometers and use them when the car comes off track. That’s the next step!

 

bookmarked!  ty!


In7anity!!


#7
thehelix112

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Setup is from a race shop, has a decent amount of toe out I think. It's rather squirrely that's for sure. I'll get it set to 0 toe next time.

Thanks elf!

Any other advice, other than rotate the tyres a bit more often? Upper control arms with more castor I think is in order.

Dave
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#8
shawnhayes

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Dave,

 

For OEM "track" settings, that's pretty normal tire wear for the GT-R.  Elf's settings may get you more usage, but that's pretty good.

 

Shawn


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#9
shawnhayes

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Could be a lot worse:

Dominion raceway and an OEM track setting...

e1c60dc397e9310e1fa12a40aad386e2.jpg

9434cb93cc152b808dacd3ac3980b83c.jpg

Shawn
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#10
thehelix112

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Oof! Now I don't feel as bad. Thanks!
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#11
Enshiu

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Looks normal to me? I have the same wear on the front axle like that after 32000km street.


Edited by Enshiu, 12 April 2019 - 10:29 AM.


Been working with enshiu on my car for the past 2 days. This guy is a mad scientist. He knows his stuff about GT-Rs. We spent the past few days changing brakes, rotors and upgrading my  gotboost full intercooler piping. Enshiu will post pics of my car later.

 

My project:

 

http://www.gtrherita...-600whp-upgrade





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