Taller tires screw up asr???

[Bolling]

I just installed a set of C6 Z06 on my 92 ZR1. The rear tires are much taller and now I'm getting service ASR and service ASB. Are the taller tires the reason or is it something else?

[mike100]

Possibly... assuming that you did not increase the diameter of the fronts in the same proportion.

[Bolling]

Originally Posted by mike100

Possibly... assuming that you did not increase the diameter of the fronts in the same proportion.

I'm sure there not the same proportion.

[XfireZ51]

Originally Posted by Bolling

I just installed a set of C6 Z06 on my 92 ZR1. The rear tires are much taller and now I'm getting service ASR and service ASB. Are the taller tires the reason or is it something else?

Mine does not and I am using same wheels w 285/18F an 325/19R tires. My rear tires are about an inch taller than stock.

[Bolling]

Originally Posted by XfireZ51

Mine does not and I am using same wheels w 285/18F an 325/19R tires. My rear tires are about an inch taller than stock.

Mine are front 275/35/18 rear 345/30/19

[Bolling]

Originally Posted by XfireZ51

Mine does not and I am using same wheels w 285/18F an 325/19R tires. My rear tires are about an inch taller than stock.

What size spacer are you running in the rear?

[98indypacer]

Almost 6% revs/mile difference may be a problem for ASR.

Diameter
Front = 25.6
Rear = 27.1
Difference = +5.9

Width
Front = 10.83
Rear = 13.58
Difference = +25.4%

Sidewall
Front = 3.79
Rear = 4.07
Difference = +7.4%

Circumference
Front = 80.3
Rear = 85.2
Difference = +6.1%

Revs/Mile
Front = 788.9
Rear = 743.2
Difference = -5.8%

[Bolling]

Originally Posted by 98indypacer

Almost 6% revs/mile difference may be a problem for ASR.

Diameter
Front = 25.6
Rear = 27.1
Difference = +5.9

Width
Front = 10.83
Rear = 13.58
Difference = +25.4%

Sidewall
Front = 3.79
Rear = 4.07
Difference = +7.4%

Circumference
Front = 80.3
Rear = 85.2
Difference = +6.1%

Revs/Mile
Front = 788.9
Rear = 743.2
Difference = -5.8%

Is there any way of fixing it through the computer?

[Jagdpanzer]

The constant difference between front and rear wheel speed is to much (more than 4.5%) which triggers the ABS and ASR systems check lights.
I had the same problem after changing to my Fikse wheels with staggered tire sizes 285/35R18 fronts 345/30R19 rears. Solved the problem by machining a set of 50 tooth count ABS reluctor rings for the rear spindles which compensated for the diffence in wheel speed the ABS and ASR systems see. Now life is good again.

[XfireZ51]

Originally Posted by Bolling

What size spacer are you running in the rear?

18mm