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4L80E Line pressures

Posted: Sat Jun 18, 2016 12:28 pm
by flak monkey
Anyone got any input on 4L80E line pressures? Infact anyone know what the rise rate should be with throttle position?

I know the standard controller uses TPS for load, and my installation does too (the axis label is wrong). So I'm just interested to know what the standard rise rate is, is it linear with throttle position, or is 100% line pressure achieved at say 50% throttle and it's linear to there. Or does it rise exponentially with throttle position?

I set my lowest row based on the standard line pressure with a closed throttle. So I have about 75psi at 50% duty and 180psi at 100% duty (at idle speed)

Re: 4L80E Line pressures

Posted: Fri Jun 24, 2016 7:17 am
by Matt Cramer
I would just start with full line pressure across the board, and back it off until the shifts each your desired level of softness.

Re: 4L80E Line pressures

Posted: Tue Aug 09, 2016 5:33 pm
by rxl158
Mine is set very similar and has been successfully driving well for the past two years. I even did some doodling with pressure values in the low speed and load region to make it feel like a stock cushy box ;) I've ran it on slicks a few weekends a year and works really well. The "load" should be a function of TPS And RPM if you're using the default table in TunerStudio.

Re: 4L80E Line pressures

Posted: Tue Aug 09, 2016 9:41 pm
by Rukavina
4l80e specs.pdf
(825.02 KiB) Downloaded 702 times
Hope this helps