ABS keeps coming on
Thread Starter
Instructor
Joined: Dec 2015
Posts: 228
Likes: 11
ABS keeps coming on
Put my c4 zr1 wheels on with 325/45r17 racemasters and all of a sudden anytime I hit the brakes the ABS turns on and the gauge cluster says "ABS active". This is with traction control on and off. Does anyone else know why this is happening? I know the tire setup isn't that uncommon.
Melting Slicks
Joined: Aug 2006
Posts: 2,475
Likes: 97
From: KY/TN
St. Jude Donor '13-'14-'15-'16
What pressure are you running them at?
There are a couple of people running them in this thread, so with issues so without.
https://www.corvetteforum.com/forums...post1591816749
There are a couple of people running them in this thread, so with issues so without.
https://www.corvetteforum.com/forums...post1591816749
Thread Starter
Instructor
Joined: Dec 2015
Posts: 228
Likes: 11
What pressure are you running them at?
There are a couple of people running them in this thread, so with issues so without.
https://www.corvetteforum.com/forums...post1591816749
There are a couple of people running them in this thread, so with issues so without.
https://www.corvetteforum.com/forums...post1591816749
Thread Starter
Instructor
Joined: Dec 2015
Posts: 228
Likes: 11
What pressure are you running them at?
There are a couple of people running them in this thread, so with issues so without.
https://www.corvetteforum.com/forums...post1591816749
There are a couple of people running them in this thread, so with issues so without.
https://www.corvetteforum.com/forums...post1591816749
I'm editing this as I just read it again, stock tire setup 28" tall new is 28.5"
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Outside diameter of front vs. rear has to be a certain ratio for ABS to not freak out. Sounds like you're right at or a little over the limit.. like SDPC said
Last edited by schpenxel; May 6, 2016 at 03:18 PM.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
The traction system wants to see a certain ratio between the front and rear tires. You can look at the Tire Rack site and they show the spec "revs per mile". Use the ratio for your stock tires and then try to get very close to that ratio for any change that you make.
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Burning Brakes
Joined: Jun 2013
Posts: 867
Likes: 26
From: SW Ohio
According to Tire Rack, the F:R stagger on the M6-equipped GS with OEM tires is 818/782 rev/mi = 1.046. The tires specs show a new tread depth of 8/32, so if you calculate the delta between a new tire and a worn tire with the minimum 2/32 depth, the allowable variance between front and rear stagger is a bit over 4%. Therefore, you should be able to safely run a F:R stagger ratio of between 1.026 and 1.066 without the SC nannies intervening. Don't take this as absolute gospel, nor am I claiming to be a GM engineer....just trying to help.