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4l80E intermediate 5 clutch stack with BTE drum

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Old Dec 29, 2023 | 01:49 PM
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Originally Posted by badass68
Are you variable line pressure. I see this often with turbo cars because you can be 50% tps making 800hp and epc is knocking the pressure down. If that’s the case, tune epc vs. map or switch to fixed pressure.
FYI, 195psi is plenty for 1500rwhp
​​​​​​THis was in the back of my head because I drive the car on the street and it gets into boost pretty easy so thought maybe I was getting the frictions that way. Trying to decide if I plug the epc or just set 100dc across the board in my tune.
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Old Jan 1, 2024 | 12:58 PM
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i see this commonly when dealing to tuners

max boost oil pressure from the EPC/boost valve circuit = zero duty cycle
min oil is if you crank the duty cycle to that max number (96 in HP tuners, 100 in Holley)

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Old Jan 1, 2024 | 01:30 PM
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Originally Posted by truckdoug
i see this commonly when dealing to tuners

max boost oil pressure from the EPC/boost valve circuit = zero duty cycle
min oil is if you crank the duty cycle to that max number (96 in HP tuners, 100 in Holley)
Yes so setting to 0 in Holley trans file should give "full" pressure.
Mine was using TPS rather than MAP as well which probably doesn't make sense for a turbo car as mentioned. Instead I am just going to install one of Jakes EPC plugs and call that done and see where it gets me.
I went back to some old driving logs and even at 20%DC I was getting 160psi so not sure that is my problem, but since anything under power on the street was probably in 2nd gear better safe than sorry.


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