Anyone notice Trac Control Problems when rear tires taller than front?

[Fishstyx]

I got my car back from the long list of mods below and my traction control doesn't seem to work at all. I've got a question into the tuner to ask if it was disabled in the tune, but I was also wondering if the fact that the rear wheels are 2" taller than the front would also cause an issue. I'm not getting any codes and the TC light on the dash doesn't light even when I smoke the tires in 2nd gear.

The stock wheels/tires (with 19" optional rims) have a diameter of 27.7"

new rear wheels are 28.7"
new front wheels are 26.6"

Anyone else notice this?

 

[Full_Tilt]

If youre really spinning the tires it should easily make up for the difference in speed.

I suspect your tuner disabled it.

 

[Fishstyx]

If youre really spinning the tires it should easily make up for the difference in speed.

I suspect your tuner disabled it.

This is why I want to be able to use traction control. The car so far will break free at about 4k rpms in second gear and the rpms shoot to redline, same thing when I shift to third, although I'm letting off the power as soon as the ass end kicks out.

When I push the TC button it says "AdvanceTrac Disabled". I don't recall if that's the same behavior before the mod, or if it specifically said "Traction Control Disabled".

 

[Wnt2gofst]

That is a big deference in size. I am surprised not getting abs fault. Being wheels are rotating at different speeds.

 

[VTXFrank]

On the 2011's, it says AdvanceTrac Off. But usually, you have to hold the brake down for 7(?) seconds while at a full stop before it lights up and you get the message in the gauge cluster.

Also, you can have your car moving down the road, quickly push the button twice, and it will say "SportMode" or something like that.

If you're just driving down the road and hit the button, all it says is "TracCtrl" Off" or something to that effect.

Your tuner may have disabled it to keep you from burning something up with that much torque.

 

[Fishstyx]

That is a big deference in size. I am surprised not getting abs fault. Being wheels are rotating at different speeds.

That's why I suspect there may be changes in the tune. The fronts are spinning 783 revs per mile and the rears 726.

What I really need is to talk to an AdvanceTrak expert who understands the inner secrets of how the system works. For example, it may not matter that the front and rears rotate at a different, but constant rate. I would expect the system to catch rapid changes in wheel RPM relative to the other in very short periods of time.

 

[Fishstyx]

That's why I suspect there may be changes in the tune. The fronts are spinning 783 revs per mile and the rears 726.

What I really need is to talk to an AdvanceTrak expert who understands the inner secrets of how the system works. For example, it may not matter that the front and rears rotate at a different, but constant rate. I would expect the system to catch rapid changes in wheel RPM relative to the other in very short periods of time.

Yeah, when I touch the button while rolling it says "AdvanceTrak Disabled (or Off)" and I get the yellow light in the gauge cluster, same as when I'm stopped.

 

[VTXFrank]

That's why I suspect there may be changes in the tune. The fronts are spinning 783 revs per mile and the rears 726.

What I really need is to talk to an AdvanceTrak expert who understands the inner secrets of how the system works. For example, it may not matter that the front and rears rotate at a different, but constant rate. I would expect the system to catch rapid changes in wheel RPM relative to the other in very short periods of time.

I know that in an SCT Tuner setup, you only need the Revs Per Mile for the rear tires. Also, when ordering an email tune, all they ask for is your rear tire size such as 275/35/30, etc. So I can't imagine the size differences is what's causing it. The Advance Track system only corrects through applying braking forces to either of the rear wheels and only uses the rear wheels to correct for sudden yaw as well. At least, that's what Ford says IIRC.

 

[Wnt2gofst]

ABS reads the front tires rotating and rear though. That would be why get abs light when dyno. It reads front not moving and rears are. Then after driving a few miles off dyno it resets.

 

[Fishstyx]

I know that in an SCT Tuner setup, you only need the Revs Per Mile for the rear tires. Also, when ordering an email tune, all they ask for is your rear tire size such as 275/35/30, etc. So I can't imagine the size differences is what's causing it. The Advance Track system only corrects through applying braking forces to either of the rear wheels and only uses the rear wheels to correct for sudden yaw as well. At least, that's what Ford says IIRC.

Fixing the speedometer accuracy is another thing I need to do. Mine now reads about 3% low. The SCT under the custom tune has options for spark advance, rear-end gears and revs per mile. I assume that to fix the speedo I select the custom tune, set gears to 3.73 and revs per mile to 730 and load the tune. I assume that this is the custom tune created by the shop and I won't screw anything else up by loading it with the gear/rpm changes.

 

[VTXFrank]

Fixing the speedometer accuracy is another thing I need to do. Mine now reads about 3% low. The SCT under the custom tune has options for spark advance, rear-end gears and revs per mile. I assume that to fix the speedo I select the custom tune, set gears to 3.73 and revs per mile to 730 and load the tune. I assume that this is the custom tune created by the shop and I won't screw anything else up by loading it with the gear/rpm changes.

That's right. You can change those options, although I wouldn't mess with Spark Advance at all, but you can change the gear and revs per mile without affecting the tune at all.

 

[Wharf Rat]

I have been running 26 inch M&H Frontrunners and 28 inch Mickey T DRs and haven't gotten any fuss from the ABS system.

 

[mpf]

I drove on a highly 'crowned' gravel road, and it wasn't 10 miles into it
that the Car Itself turned off advancetrac, I never hit the button!
Later, on pavement, the light went out.
Relating this because it shows how sensitive the system must be...

 

[Sky Render]

On the 2011's, it says AdvanceTrac Off. But usually, you have to hold the brake down for 7(?) seconds while at a full stop before it lights up and you get the message in the gauge cluster.

Also, you can have your car moving down the road, quickly push the button twice, and it will say "SportMode" or something like that.

If you're just driving down the road and hit the button, all it says is "TracCtrl" Off" or something to that effect.

Your tuner may have disabled it to keep you from burning something up with that much torque.

Not quite.

Pressing the button once disables traction control, but leaves stability control on.

Pressing the button twice in rapid succession activates "sport mode," which turns down both traction and stability control.

Holding the brake pedal in and pushing the button for 6 seconds disables everything except ABS.

There's a chart that sums this up in the owner's manual.

 

[Wnt2gofst]

I have been running 26 inch M&H Frontrunners and 28 inch Mickey T DRs and haven't gotten any fuss from the ABS system.

What size are teh drag radilas..My 295/55/15s are only 27.4"

 

[assasinator]

im have 275/35 on back and stock 255/40. the advancetrac kicks in any time i even get close to the limit in a corner. it almost steers me off the corner. i gotta get the same size up front. the car is very unstable at 140+ when changing lanes.

 

[Wharf Rat]

What size are teh drag radilas..My 295/55/15s are only 27.4"

275/60/15. Actually my 185/55/17 frontrunners are only 25 inches tall.

 

[Fishstyx]

Not quite.

Pressing the button once disables traction control, but leaves stability control on.

Pressing the button twice in rapid succession activates "sport mode," which turns down both traction and stability control.

Holding the brake pedal in and pushing the button for 6 seconds disables everything except ABS.

There's a chart that sums this up in the owner's manual.

I understand these steps, but what does the text in the gauge cluster actually read. In other words, does its specifically say "Traction Control Off", "Sport Mode" etc.???

 

[BAKnBLK2010]

I understand these steps, but what does the text in the gauge cluster actually read. In other words, does its specifically say "Traction Control Off", "Sport Mode" etc.???

I would think you can read as you are typing these responses. You own a 2011 so why don't you disable the traction control and READ what is says on your message center. Do we have to hold your hand and do all the work for you? Just follow the above described steps which were plainly laid out in your owners manual and READ what it says on the info center.

 

[Fishstyx]

I would think you can read as you are typing these responses. You own a 2011 so why don't you disable the traction control and READ what is says on your message center. Do we have to hold your hand and do all the work for you? Just follow the above described steps which were plainly laid out in your owners manual and READ what it says on the info center.

Hey dickhead, before you climb up on your high horse of riteousness, why don't you read the fucking thread. My car is running a custom tune and I'm trying to find out if the messages I get are the same as unmodded cars.

So, right back atcha champ.