car bugs down when active handling is on
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,295
Likes: 14
From: Grand Sport #82
car bugs down when active handling is on
Car is 02 Coupe.
If you leave the active handling on and give it some pedal at highway speed the car bugs down, the active light comes one, and the car will not accelerate.
If you do the same thing with the ASR off, the car takes of just fine.
The car is stock, so there is no way it is actually making the wheels spin at highway speed. Also with the active handling off it dosent spin the wheels at all.
What is the problem here?
If you leave the active handling on and give it some pedal at highway speed the car bugs down, the active light comes one, and the car will not accelerate.
If you do the same thing with the ASR off, the car takes of just fine.
The car is stock, so there is no way it is actually making the wheels spin at highway speed. Also with the active handling off it dosent spin the wheels at all.
What is the problem here?
Last edited by Lars87; Apr 14, 2010 at 05:08 AM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Something is making the EBTCM "THINK" that the rear wheels are spinning faster than the front wheels. The tire size check recommendation is very good. So is checking the DTC's
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Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,295
Likes: 14
From: Grand Sport #82
I will pull the codes to make sure this saturday.
Its possible to correct for this in the PCM right?
Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Please post the actual tire sizes (ie 245/40/18 front, 285/35/19 rear), and if one (or both) of what you have are of wrong size, we could suggest the best solution. You may not have to replace them all.
And no, this issue cannot be corrected with tuning software...Sizing tires properly, or shutting off TC are the only two ways to fix it.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The calcuations that allow your EBTCM to preform Antilock, and Active Handling are preformed in the EBTCM. There are ZERO interfaces that can program or change the EBTCM. If you have the wrong size tires (ratio front to rear) you either going to need to run with AH/TC off or get different tires.
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Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,295
Likes: 14
From: Grand Sport #82
With those tire sizes in combination you are pretty much asking for AH/TC problems. Generally accepted rule is that the rear tire overall diameter should be at least 1/2 inch taller than the front overall tire diameter.
Your front is about 25.7 inches and your rear is about 25.6. Not a combination to run unless you want to turn off AH/TC every time you start the car.
Your front is about 25.7 inches and your rear is about 25.6. Not a combination to run unless you want to turn off AH/TC every time you start the car.
Wouldt it be ok to just change the size on the rear for something with near stock diameter, and leave the fronts.
