Tire issues... stabilitrack maybe?
Thread Starter
Burning Brakes
Joined: Dec 2017
Posts: 834
Likes: 167
From: New Orleans LA
Tire issues... stabilitrack maybe?
I went from 19 x 10 and 20 x 12 with tires sizes of 285/30 19 and 335/25 20 to 18 x 8 and 18 x 12 with tires 275/35 18 and 335/30 18. It seems t
like the rear brakes are acting funny when at high speeds on a run. Has anyone experienced this?
like the rear brakes are acting funny when at high speeds on a run. Has anyone experienced this?
Racer
Joined: Jun 2019
Posts: 386
Likes: 149
only relative size matters. Calculate your ratio of rear to front tire diameter. it should be close to 1.03. If its too far from that - less than 1.01 or more than 1.05 then that's your issue. (i made up that range BTW, it could trigger ice mode at 1.04 too)
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
Traction control will activate if tire sizes make the rear tires seem to be spinning faster in relationship to the front than what you would have for the stock ratio.
Stabilitrack activates when the steering wheel is turning and the yaw angle of the car doesn't turn as fast as it should for the steering wheel angle (understeer) or if the yaw of the car changes faster than the steering angle of the steering wheel (oversteer). Understeer is counteracted by applying the inside rear brake while oversteer is counteracted by applying the outside front brake. Stabilitrack doesn't give a damn what the tire ratio is when deciding to activate. Activation is all based on steering angle, yaw rate and lateral Gs being experienced. If your steering wheel is off center by a lot when driving straight down the road Stabilitrack can interpret the lack of yaw response as understeer and apply a rear brake to correct the perceived steering angle/yaw discrepancy. The closer the steering angle is to zero when the car is driving straight the better. If your steering wheel is pointed straight ahead when you are driving down a straight road Stabiltrack won't activate.
Bill
Stabilitrack activates when the steering wheel is turning and the yaw angle of the car doesn't turn as fast as it should for the steering wheel angle (understeer) or if the yaw of the car changes faster than the steering angle of the steering wheel (oversteer). Understeer is counteracted by applying the inside rear brake while oversteer is counteracted by applying the outside front brake. Stabilitrack doesn't give a damn what the tire ratio is when deciding to activate. Activation is all based on steering angle, yaw rate and lateral Gs being experienced. If your steering wheel is off center by a lot when driving straight down the road Stabilitrack can interpret the lack of yaw response as understeer and apply a rear brake to correct the perceived steering angle/yaw discrepancy. The closer the steering angle is to zero when the car is driving straight the better. If your steering wheel is pointed straight ahead when you are driving down a straight road Stabiltrack won't activate.
Bill
Drifting
Joined: Sep 2019
Posts: 1,355
Likes: 635
From: St. Louis
Are your front wheels really 18x8? that is too narrow for a 275/35 tire.
