Maverick9110e

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.

09WhiteXL

Ive got 315/70/17 on stock rims on my XL and have no trouble with TC flashing on at all. Lovin my base model lol

manic5_2001

The TCs on the truck use 3 systems, wheel spin, steering angle, and Gyro scope. All of which would effect the TC's activating.

Maverick9110e

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?

Man Truck

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?

CyberJeff

Does it have anything to do with aftermarket wheels? Or maybe the offset of the wheels? Does the TPMS have anything to do with the TC sensors?

Mr24

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?

03Cobraa

If the Raptor can run 35's looks like Ford dealers could change the tune in our trucks to allow for this size of tire! Whats the difference?

GROUNIE

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

NorCal-09

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!