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The mkiv Supra Owners Club

RLTC and stock Traction control


SKI

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Anyone know why you're supposed to turn off the stock traction contol when you have RLTC fitted!? I have a UK TT with RLTC.

 

I thought that stock kicked in at around 14% slip. If you have RLTC at 5% surely the stock system should never engage.

 

I can understand why it might get upset with snow mode on the japs spec but other than that......

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Phil, I could understand that if you were running 15% slip, but surely the stock system wouldn't even be near to activating if you were running 5% (wouldn't RLTC catch it way before at this level), then you could leave your stock system on as an emergency backup!

 

I rarely run mine above the basic dry setting which I find excellent, so under those conditions should I just leave the stock on?

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Originally posted by SKI

Phil, I could understand that if you were running 15% slip, but surely the stock system wouldn't even be near to activating if you were running 5% (wouldn't RLTC catch it way before at this level), then you could leave your stock system on as an emergency backup!

 

I rarely run mine above the basic dry setting which I find excellent, so under those conditions should I just leave the stock on?

 

As already said, the RLTC will cut in and do it's stuff far quicker than the stock TC will respond. But the stock TC can/will still cut in if you're driving the car hard enough. Because although RLTC is doing it's thing, the wheel speeds may still be different enough to allow the stock one to kick in.

If you're RLTC is set to 5% slip as you go into a corner, and you keep power on through the corner, as you exit, RLTC can increase the slip range as you begin to straighten up. It could go as far as 10% once your straight. So, the stock TC could easily 'think' it needs to start working.

 

Does that make sense?

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I know that removing the trac ecu on a 6 speed is fine, but doesn't it hold back the revs on an auto when the gear change happens ?

I thought this was the same as what happened when you take the trac fuse out in an auto ? Giving hard and damaging gear shifts ?

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The auto ecu uses the trac butterfly to feather the power during the auto shift. This is one reason I left everything as is when I had the RLTC fitted and just made a point of it becoming startup routine to press the button to turn it off.........

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