Tire size and Traction control
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Instructor
Joined: Nov 2011
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From: NH
Tire size and Traction control
I think running 17" front wheels on all 4 corners is making traction control come on at 40-50 MPH. If I configure the tire size with HP Tuners to all 17s, will Traction Control respect that and NOT think there is wheel spin?
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Instructor
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From: NH
Melting Slicks
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For future readers considering changing tire sizes if you want to avoid traction control issues your goal is maintain the same difference in tire circumference that the car had with stock sizes.
That means when you have a smaller wheel you need a taller sidewall if you keep the same tread width. There are tire size calculators online to assist in figuring this out.
Race Director
Joined: Jan 2000
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From: Central TX
C5 of Year Finalist (appearance mods) 2019
While some people's goal is maintain the same difference in tire circumference that the car had with stock sizes, the AH/TC on these cars isn't that sensitive that doing so is critical. As long as the front tires are shorter in diameter, you shouldn't have issues. The tire combos I've used on both of my C5's never had any AH/TC issues, even with a much bigger stagger. Fronts are 265/35/18 @ 25.3" tall and rears are 325/30/19 @ 26.7" tall.
For awhile, my former Z06 had 25" tall fronts and 27.2" rears. Those tire sizes were on the car for years, without any issues.
For awhile, my former Z06 had 25" tall fronts and 27.2" rears. Those tire sizes were on the car for years, without any issues.
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A cheap solution would be to run 255/45/17's on the rear. That should correct the issue.
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Instructor
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From: NH
The car has non Bowling Green body panels. I needed to reduce the rear tire size to fit my application. I have changed tire sizes in the ECM/BCM on a different project car. That change corrected the stock C5 speedometer, but I have no idea if TC would see that change since that previous LS1 swapped project car does not have ABS or TC.
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The car has non Bowling Green body panels. I needed to reduce the rear tire size to fit my application. I have changed tire sizes in the ECM/BCM on a different project car. That change corrected the stock C5 speedometer, but I have no idea if TC would see that change since that previous LS1 swapped project car does not have ABS or TC.
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Thread Starter
Instructor
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From: NH
Thread Starter
Instructor
Joined: Nov 2011
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From: NH
Ok, traction control and ABS seem very confused. I've found a temporary solution was to remove the ABS fuse. Both ABS and TC appear to be permanently off which is fine. Neither is really needed the way this car is driven and no more intermittent TC engagement. I'll revisit after I change the tire size in the ECM/BCM as well as check out the wheel sensors.
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Joined: Sep 2024
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From: Cape Coral, FL
Ok, traction control and ABS seem very confused. I've found a temporary solution was to remove the ABS fuse. Both ABS and TC appear to be permanently off which is fine. Neither is really needed the way this car is driven and no more intermittent TC engagement. I'll revisit after I change the tire size in the ECM/BCM as well as check out the wheel sensors.
Have you changed the size in the ECM and had a chance to drive it yet ?
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Instructor
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From: NH
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If this helps you out....I ran 315-30-18 rear tires with the stock size front tires (245-45-17?) for years and had no issues with TC, AH, or ABS. 315-30-18 rear tires are only 25.44" diameter, and 245-45-17 fronts are 25.68" diameter. Some forum members thru the years have insisted that the rear tires must be of a larger diameter than the fronts are, or you'll run into TC/AH problems. I did not find that to be the case. YMMV.....
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
If this helps you out....I ran 315-30-18 rear tires with the stock size front tires (245-45-17?) for years and had no issues with TC, AH, or ABS. 315-30-18 rear tires are only 25.44" diameter, and 245-45-17 fronts are 25.68" diameter. Some forum members thru the years have insisted that the rear tires must be of a larger diameter than the fronts are, or you'll run into TC/AH problems. I did not find that to be the case. YMMV.....
Pro
Joined: Apr 2004
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From: McKinney TX
I ran square 18s "same size front and rear"on an 2003 with no abs or traction control issues or error codes
I ran square 19s "same size front and rear" on a 2000 with on abs or traction control issued or error codes
Never reprogrammed anything on either car
I ran square 19s "same size front and rear" on a 2000 with on abs or traction control issued or error codes
Never reprogrammed anything on either car
Pro
Joined: Apr 2004
Posts: 536
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From: McKinney TX
I ran square 18s "same size front and rear"on an 2003 with no abs or traction control issues or error codes
I ran square 19s "same size front and rear" on a 2000 with on abs or traction control issued or error codes
Never reprogrammed anything on either car
I ran square 19s "same size front and rear" on a 2000 with on abs or traction control issued or error codes
Never reprogrammed anything on either car
Race Director
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C5 of Year Finalist (appearance mods) 2019
If this helps you out....I ran 315-30-18 rear tires with the stock size front tires (245-45-17?) for years and had no issues with TC, AH, or ABS. 315-30-18 rear tires are only 25.44" diameter, and 245-45-17 fronts are 25.68" diameter. Some forum members thru the years have insisted that the rear tires must be of a larger diameter than the fronts are, or you'll run into TC/AH problems. I did not find that to be the case. YMMV.....
Race Director
Joined: Jan 2000
Posts: 10,371
Likes: 3,384
From: Central TX
C5 of Year Finalist (appearance mods) 2019