Bigger tires = traction control?
#21
This is weird, what we need to do is figure out what and how the TSC senses' that will tell you what's causing it. Doesn' it go off of wheelspin, i thinking adjusting the computer to the tires that you put on would seem to be the biggest issue.
#24
The TC uses all 3 or all three systems use each. That sounds to me like the gyro would be more for the RSC system then the TC system, or are you just talking the advancetrac system in general?
#25
Senior Member
HERE'S A NEW QUESTION ALL TOGETHER: If our trucks are doing this on dry roads during a tight a turn. How is it going to react on snow doing a curve or tight turn?
#27
Junior Member
Join Date: Jun 2010
Location: SW Ontario
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With four wheel ABS you need to monitor the wheel rotation at each individual wheel right? If that is true then...
So if I am programming the traction control system I expect a certain differential in wheel rotation while steering. In a left turn the inside wheel will rotate at a slower speed and a number of times than the outside wheel. Wheel rotation and speed is directly linked to the size of your wheel tire combo.
What could be happening is that when Ford programmed the TC they didn't bother to take tire size into account in the calculation that determines if the system needs to intervene and keep the truck shiny side up. In plain speak when you up-size your wheels you are slowing down the amount of rotation that the ABS sensor sees when you are turning. The computer doesn't see what it expects anymore and it assumes that you are skidding.
Example:
stock wheel (31") - 90 degree turn, inside wheel 15 rotations, outside 19.32. Difference 4.32 rotations
aftermarket (33") - 90 degree turn, inside wheel 14.39 rotations, outside 18.14. Difference 3.75 rotations
aftermarket (35") - 90 degree turn, inside wheel 13.57 rotations, outisde 17.11. Difference 3.54 rotations
You gents with this problem, are you all running a common wheel diameter?
Thoughts?
So if I am programming the traction control system I expect a certain differential in wheel rotation while steering. In a left turn the inside wheel will rotate at a slower speed and a number of times than the outside wheel. Wheel rotation and speed is directly linked to the size of your wheel tire combo.
What could be happening is that when Ford programmed the TC they didn't bother to take tire size into account in the calculation that determines if the system needs to intervene and keep the truck shiny side up. In plain speak when you up-size your wheels you are slowing down the amount of rotation that the ABS sensor sees when you are turning. The computer doesn't see what it expects anymore and it assumes that you are skidding.
Example:
stock wheel (31") - 90 degree turn, inside wheel 15 rotations, outside 19.32. Difference 4.32 rotations
aftermarket (33") - 90 degree turn, inside wheel 14.39 rotations, outside 18.14. Difference 3.75 rotations
aftermarket (35") - 90 degree turn, inside wheel 13.57 rotations, outisde 17.11. Difference 3.54 rotations
You gents with this problem, are you all running a common wheel diameter?
Thoughts?
#29
I have some of the same problems. I have a 2010 f150 fx4 lifted with 295/60/20 and my speedometer is off. And every time i go around a curv that is rated for 35 doing over 40 my tcs kicks in. We have to find a fix
#30
Senior Member
This is interesting and a perfect example of why this forum is so valuable!
As indicated in another thread, I have A/T tires, size 285/75/18, on the factory 18" wheels.
There is an on-ramp from S/B Scott Rd. to E/B US-50 in the city of Folsom, which I use about two or three times a month. The on-ramp is on a grade, it has a fairly tight decreasing radius turn to the right; and it is also 'significantly' banked (drivers side high and passenger low), not a typical straight and level, freeway on-ramp.
Over the past two or three months now since installing the taller tires, I have had this happen about 25-30% of the time, when taking this one ramp. The first time really alarmed me and I thought I had a damaged drivetrain or suspension component. The second time, and then the third time this occurred, I figured it out (that it had to do with the configuration of the turning action on this particular ramp) and not something defective in the suspension or wheels. I now go through the apex of the turn while coming down the ramp at a more reduced speed and the issue has not recurred in the past month or more.
Again, this is the only situation/scenario wherein this has occurred, even while experiencing a variety of driving environments and weather conditions including very heavy rain and snow covered, winding, mountain roads. At the time, I just assumed it had something to do with a brake sensor (even though I have stock wheels) and didn't think about the other sensor systems these vehicles now have, until reading this thread tonight. Great info!
As indicated in another thread, I have A/T tires, size 285/75/18, on the factory 18" wheels.
There is an on-ramp from S/B Scott Rd. to E/B US-50 in the city of Folsom, which I use about two or three times a month. The on-ramp is on a grade, it has a fairly tight decreasing radius turn to the right; and it is also 'significantly' banked (drivers side high and passenger low), not a typical straight and level, freeway on-ramp.
Over the past two or three months now since installing the taller tires, I have had this happen about 25-30% of the time, when taking this one ramp. The first time really alarmed me and I thought I had a damaged drivetrain or suspension component. The second time, and then the third time this occurred, I figured it out (that it had to do with the configuration of the turning action on this particular ramp) and not something defective in the suspension or wheels. I now go through the apex of the turn while coming down the ramp at a more reduced speed and the issue has not recurred in the past month or more.
Again, this is the only situation/scenario wherein this has occurred, even while experiencing a variety of driving environments and weather conditions including very heavy rain and snow covered, winding, mountain roads. At the time, I just assumed it had something to do with a brake sensor (even though I have stock wheels) and didn't think about the other sensor systems these vehicles now have, until reading this thread tonight. Great info!
Last edited by NorCal-09; 11-30-2010 at 11:36 AM. Reason: typo