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Discussion Starter · #1 ·
It seems to be the consensus that traction control takes away alot of power on hard acceleration. My idea is that If a slightly taller tire were used in the rear (e.g. 305/60R18) it would cause the rear tire to spin relatively slower than the front under normal driving. Under hard acceleration, this would allow the rear tires to slip more before the traction control intervenes. This would allow more power to the rear tires without blowing out the tires. Maybe this will allow the traction control to work for us instead of against us in a race. There is a 2.5% difference between the 2 sizes-hopefully this wouldn't cause adverse effects.
Opinions???
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If you want to race, press the button once. It turns off VSC/TRAC and turns on AUTO-LSD. The Auto-LSD doesn't kill the engine like TRAC does.
 

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If you want to race, press the button once. It turns off VSC/TRAC and turns on AUTO-LSD. The Auto-LSD doesn't kill the engine like TRAC does.
The only problem i have found with this is when mine shifts to second and breaks loose and starts to step a bit sideways the vsc kicks in and takes power away,,,, So if i am gonna push it ,,, i just kill it all ,,, and hold her down for 3 seconds,,,,:devil:
 

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when you press it once the car with the burnout behind it comes on what does that mean?
 

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Pressing once does not turn off VSC only Trac and turns on Auto LSD, must come to complete stop then hold down for three secs for no LSD TRAC or VSC. Problem here is open diff. With VSC and LSD on (Trac off), the truck will still kill the throttle if if feels an unsafe (unstable) situation, that's why when it "starts getting sideways" the computer will kill the throttle even with Trac off and LSD on.

The true solution can come two ways:
1. Reprogram to remove VSC when LSD on or
2. Add a detroit, lockright, Mechanical lsd or locker (better choice in my opinion)

This screws me because I like to play in the dunes in 2 wheel drive. Auto lsd will heat up my brakes and VSC will kill throttle constantly in unstable situations. One wheel drive (open diff) in the sand sucks.

Tom
 

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when you press it once the car with the burnout behind it comes on what does that mean?
That means light 'em up, Dude! Actually means your auto limited slip is activated which will apply brakes to slow down the spinning wheel as opposed to cutting power and applyiing brakes in VSC mode.
 

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Discussion Starter · #9 ·
That's why I would like to adjust the TRAC threshold via tire diameter change. If the rear tires are 2.5% larger they will spin 2.5% before the TRAC kicks in. That may be just enough slip for the TRAC to "allow" enough power for maximum acceleration but not so much as to overwhelm the tires. Basically I want the computer to do my job(modulate the throttle to achieve best take-off). Toyota wants the traction control to prevent wheelspin completely at the expense of performance. When I get around to it I'm using these tires anyway(proxes S/T 305/60r18) for the rears. At the least I'll get better traction. I'll let you know how it goes.
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It seems to be the consensus that traction control takes away alot of power on hard acceleration. My idea is that If a slightly taller tire were used in the rear (e.g. 305/60R18) it would cause the rear tire to spin relatively slower than the front under normal driving. Under hard acceleration, this would allow the rear tires to slip more before the traction control intervenes. This would allow more power to the rear tires without blowing out the tires. Maybe this will allow the traction control to work for us instead of against us in a race. There is a 2.5% difference between the 2 sizes-hopefully this wouldn't cause adverse effects.
Opinions???
Rumbler
I have no idea what your talking about but running different diameter tires definately wouldn't work on a 4WD.
 

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Running a different size tire would be very bad for the truck's VSC system. It would sense that the front tires would be turning at a different rate than the rears (regardless whether faster or slower) and the system would activate even while driving in a straight line at cruise. There are sensors for each of the four wheels. I don't know how much error the system would allow before activating but you could end up with a burned up brake control or worse. At best it would be dragging the brakes to correct the difference in wheel speed.

I have seen even older Toyota traction control systems have problems. An example would be on a dyno where the front wheels are stationary and the rears are turning.
 
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