Traction/Stability control
Thread Starter
Cruising
Joined: May 2024
Posts: 11
Likes: 0
Traction/Stability control
Group… I replaced the tires and rims on a stock 2014 Stingray base model and now if I get on it the traction control kicks in immediately. It never did that with the stock wheels which were 285/35/19. The rear tires are now 305/30/20. I did not have the TPMS installed in the new rims because Firestone wanted $85 each just for the sensors. So I guess my question is this… with the TPMS not installed, would that cause the traction control to kick in more frequently? I’m thinking maybe because an inaccurate tire pressure is being reported, so maybe tire pressure will cause the traction control to kick in even if the wheels are not spinning. Thoughts? Thanks in advance. Eric
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,801
From: Charlotte, NC (formerly Endicott, NY)
The tire pressure sensor does not affect when the ebcm determines the rear wheels are spinning, the ebcm determines whether the rear tires are spinning by comparing their relative wheel speeds with the front wheel speeds. The rear tires being larger in diameter will rotate slightly slower than the front tires but the EBCM knows the ratio between the front and rear and considers that. What is the diameter of your front tire? If that is too large that will change the ratio and make the EBCM think the rear tires are spinning.
Bill
Bill
Last edited by Vetteman Jack; Sep 15, 2024 at 04:16 AM.
Thread Starter
Cruising
Joined: May 2024
Posts: 11
Likes: 0
The tire pressure sensor does not affect when the ebcm determines when the rear wheels are spinning, the ebcm determines whether the rear tires are spinning by comparing their relative wheel speeds with the front wheel speeds. The rear tires being larger in diameter will rotate slightly slower than the front tires but the EBCM knows the ratio between the front and rear and considers that. What is the diameter of your front tire? If that is too large that will change the ratio and make the EBCM think the rear tires are spinning.
Bill
Bill
Thread Starter
Cruising
Joined: May 2024
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Hey man… I was thinking of jumping up to a 265/35/19 in the front. Is that what you have? Does your traction control engage often?
Burning Brakes
Joined: Nov 2022
Posts: 910
Likes: 430
From: MN
What kind of tires di dyou have on the rear, and what do you have now?
Maybe you simply have less traction with the new rubber compound?
Do you see a difference with temps, i.e. when it warms up the TC isn't triggered as readily?
Maybe you simply have less traction with the new rubber compound?
Do you see a difference with temps, i.e. when it warms up the TC isn't triggered as readily?
Drifting
Joined: May 2010
Posts: 1,273
Likes: 74
From: Fairfield County, CT
The tire size changes are likely the cause of your issue.
Stock the ratio of the diameter rear/front is 1.044 [26.85 v 25.72 using non Z51 sizes or 1.14"]. My experience is when you change the ratio by more than 3%, the traction control kicks in.
Your current ratio is 1.006, a -3.6% difference [305/30/20 [27.20] and 255/40/19 [27.03] or .17"]. Too much of a change/too small of a difference rear to front.
If you move to 265/35/19s in the front you will have the same problem just in a different direction - the diameter difference would be too large as opposed to too small. The new ratio would be 1.08 or +3.4% or 2.10".
Put your tire sizes in Excel, calculate the diameters and the ratio. Do a seperate calculation for each other tire size you are considering. If the ratio differences are less than 3% [larger or smaller], the TC intervention will go away. Tirerack will do it for you as well. Just call them and they will let you know what combo will keep TC away.
Good luck
Stock the ratio of the diameter rear/front is 1.044 [26.85 v 25.72 using non Z51 sizes or 1.14"]. My experience is when you change the ratio by more than 3%, the traction control kicks in.
Your current ratio is 1.006, a -3.6% difference [305/30/20 [27.20] and 255/40/19 [27.03] or .17"]. Too much of a change/too small of a difference rear to front.
If you move to 265/35/19s in the front you will have the same problem just in a different direction - the diameter difference would be too large as opposed to too small. The new ratio would be 1.08 or +3.4% or 2.10".
Put your tire sizes in Excel, calculate the diameters and the ratio. Do a seperate calculation for each other tire size you are considering. If the ratio differences are less than 3% [larger or smaller], the TC intervention will go away. Tirerack will do it for you as well. Just call them and they will let you know what combo will keep TC away.
Good luck
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Joined: Dec 2009
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From: bradenton Fl
When I got new tires for my c6 this made some difference. From a performance tire web site
[size=88px]New tires should be driven a few hundred miles on dry roads to rid the tread of parting agents and antioxidants applied during production. When tires are cured, a release lubricant is applied to prevent the tires from sticking to the mold. By driving on the tires for a few hundred miles, these lubricants will wear off and allow the tire components to begin working together. Not until the tread is slightly roughened will you be able to feel a tires true gripping power.[/size]
[size=88px]New tires should be driven a few hundred miles on dry roads to rid the tread of parting agents and antioxidants applied during production. When tires are cured, a release lubricant is applied to prevent the tires from sticking to the mold. By driving on the tires for a few hundred miles, these lubricants will wear off and allow the tire components to begin working together. Not until the tread is slightly roughened will you be able to feel a tires true gripping power.[/size]
Thread Starter
Cruising
Joined: May 2024
Posts: 11
Likes: 0
The tire size changes are likely the cause of your issue.
Stock the ratio of the diameter rear/front is 1.044 [26.85 v 25.72 using non Z51 sizes or 1.14"]. My experience is when you change the ratio by more than 3%, the traction control kicks in.
Your current ratio is 1.006, a -3.6% difference [305/30/20 [27.20] and 255/40/19 [27.03] or .17"]. Too much of a change/too small of a difference rear to front.
If you move to 265/35/19s in the front you will have the same problem just in a different direction - the diameter difference would be too large as opposed to too small. The new ratio would be 1.08 or +3.4% or 2.10".
Put your tire sizes in Excel, calculate the diameters and the ratio. Do a seperate calculation for each other tire size you are considering. If the ratio differences are less than 3% [larger or smaller], the TC intervention will go away. Tirerack will do it for you as well. Just call them and they will let you know what combo will keep TC away.
Good luck
Stock the ratio of the diameter rear/front is 1.044 [26.85 v 25.72 using non Z51 sizes or 1.14"]. My experience is when you change the ratio by more than 3%, the traction control kicks in.
Your current ratio is 1.006, a -3.6% difference [305/30/20 [27.20] and 255/40/19 [27.03] or .17"]. Too much of a change/too small of a difference rear to front.
If you move to 265/35/19s in the front you will have the same problem just in a different direction - the diameter difference would be too large as opposed to too small. The new ratio would be 1.08 or +3.4% or 2.10".
Put your tire sizes in Excel, calculate the diameters and the ratio. Do a seperate calculation for each other tire size you are considering. If the ratio differences are less than 3% [larger or smaller], the TC intervention will go away. Tirerack will do it for you as well. Just call them and they will let you know what combo will keep TC away.
Good luck
