Ok to electronically tune a cars shift firmness when it has a heavy duty shift kit?
04-02-2011, 06:45 PM
#1
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Ok to electronically tune a cars shift firmness when it has a heavy duty shift kit? Hello. My car is eqipped with what the transmission shop called a heavy-duty shift kit, which he said is primarily designed for transmission protection rather than racing. Is it ok to use a handheld tuner to make the car shift harder when such a device is installed? Any advice would be greatly appreciated.
04-03-2011, 11:27 AM
#2
The shift pressure modifiers are the only I'd recommend increasing, not the pressure constant.
By changing the shift pressures the pressure goes high only a few seconds before the shift, during the shift, and a few seconds after the shift. Increasing the constant makes the pressure higher all the time.
It would be more correct to put a pressure gauge on it and make adjustments.
TransGo recommends at least 190 psi shift pressure at WOT. And 240 max, but thats built into the trans by boost valve size and spring tension.
WOT pressure is usually 100% mechanically controlled, at lower throttle positions the EPC (Electronic Pressure Control) bleeds off pressure. The higher the TPS the lower the bleed off.
When you change the pressures by tuning you're basically changing the bleed off rate of the EPC at lower TPS.
By changing the shift pressures the pressure goes high only a few seconds before the shift, during the shift, and a few seconds after the shift. Increasing the constant makes the pressure higher all the time.
It would be more correct to put a pressure gauge on it and make adjustments.
TransGo recommends at least 190 psi shift pressure at WOT. And 240 max, but thats built into the trans by boost valve size and spring tension.
WOT pressure is usually 100% mechanically controlled, at lower throttle positions the EPC (Electronic Pressure Control) bleeds off pressure. The higher the TPS the lower the bleed off.
When you change the pressures by tuning you're basically changing the bleed off rate of the EPC at lower TPS.