Traction Control while on Freeway!!!!
Thread Starter
Drifting
Joined: May 2008
Posts: 1,358
Likes: 0
From: LA Area CA
Traction Control while on Freeway!!!!
While I am driving on the freeway at around 70 and then give it a lil gas to pass a car or just to have a lil fun. The traction control comes on and totally limits my power. This happend when I was going about 90 also. I know the tires are not slipping and I have perfectly good traction cause I am not even getting above 3000 rpm. What is going on here?
Service Traction Control never has come on. I do have different wheels on the car that are 19/20 x 11s. When I had the stock wheels this never happened so I guess it has something to do with the wheels. Is this somthing I should get serviced or what is the deal here
Please Help!!
Service Traction Control never has come on. I do have different wheels on the car that are 19/20 x 11s. When I had the stock wheels this never happened so I guess it has something to do with the wheels. Is this somthing I should get serviced or what is the deal here
Please Help!!
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
It does not have anything to do with the wheels per say, but probably does with the tires.
Changing the over all tire height is going to effect how the car sees wheel speeds. If it notices a dramatic change in wheel speed front to rear the car will think that one set of wheels is spinning faster than the other and traction control will become active.
Be very careful when selecting tires to see Rev/Mile and overall tire height. GM did give you a little window to make adjustments but they must remain relatively close to factory.
Changing the over all tire height is going to effect how the car sees wheel speeds. If it notices a dramatic change in wheel speed front to rear the car will think that one set of wheels is spinning faster than the other and traction control will become active.
Be very careful when selecting tires to see Rev/Mile and overall tire height. GM did give you a little window to make adjustments but they must remain relatively close to factory.
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Stock
245/40/18 25.7" over all height
285/35/19 26.9" over all height
Yours
275/30/19 25.5" over all height
305/25/20 26" over all height
Your front did not change to much but the rear has changed almost 1" in height. That is not all that is changing here but a quick look at the numbers says you should have a rear tire closer to a 305/30 moving height up to closer to stock.
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Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Pro
Joined: Jul 2007
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From: Lynchburg VA
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
305/30/19 26.5"
Yours is opposite of his. The fronts are now taller but the rears are shorter.
Le Mans Master
Joined: Aug 2000
Posts: 6,486
Likes: 1,658
From: Las Vegas NV
Wheels are fine, I think the biggest issue with those is the fact the rear changed much more in relation to the front
Stock
245/40/18 25.7" over all height
285/35/19 26.9" over all height
Yours
275/30/19 25.5" over all height
305/25/20 26" over all height
Your front did not change to much but the rear has changed almost 1" in height. That is not all that is changing here but a quick look at the numbers says you should have a rear tire closer to a 305/30 moving height up to closer to stock.
Stock
245/40/18 25.7" over all height
285/35/19 26.9" over all height
Yours
275/30/19 25.5" over all height
305/25/20 26" over all height
Your front did not change to much but the rear has changed almost 1" in height. That is not all that is changing here but a quick look at the numbers says you should have a rear tire closer to a 305/30 moving height up to closer to stock.
Anthony has it nailed...
I think that you need to maintain about a 0.75 to 1.5 inch difference in the overall height of the tires from front to rear. Stock setup has about a 1.1-1.2 inch difference, and there is a little leeway up or down on that difference. Sounds like your setup (with only 0.5 inch difference in height) is outside of the envelope, and might cause some problems with the trac control (and by association, the active handling too), as the car thinks that the rears are slipping, due to their overspeed as compared to the fronts.
Get taller rear tires or shorter fronts...
Le Mans Master
Joined: Aug 2000
Posts: 6,486
Likes: 1,658
From: Las Vegas NV
The rears should be somewhere around an inch taller overall than the fronts. (see other posts in this thread)
Last edited by Kent1999; Sep 8, 2008 at 06:44 PM.
Race Director
Joined: Apr 2008
Posts: 17,373
Likes: 6
From: Chatsworth California
Wheels are fine, I think the biggest issue with those is the fact the rear changed much more in relation to the front
Stock
245/40/18 25.7" over all height
285/35/19 26.9" over all height
Yours
275/30/19 25.5" over all height
305/25/20 26" over all height
Your front did not change to much but the rear has changed almost 1" in height. That is not all that is changing here but a quick look at the numbers says you should have a rear tire closer to a 305/30 moving height up to closer to stock.
Stock
245/40/18 25.7" over all height
285/35/19 26.9" over all height
Yours
275/30/19 25.5" over all height
305/25/20 26" over all height
Your front did not change to much but the rear has changed almost 1" in height. That is not all that is changing here but a quick look at the numbers says you should have a rear tire closer to a 305/30 moving height up to closer to stock.