Line pressure vs kpa
Thread Starter
TECH Fanatic
Joined: Oct 2022
Posts: 1,778
Likes: 629
From: Louisiana
Line pressure vs kpa For those who dont know my setup is a single cab silverado with a piston & rod gen 4 5.3 with vs racing next gen 2.5 78/75. I have a 4l60e that is built to handle the power levels i putting at it with a rossler transbrake. I was wondering what kind of line pressure you guys are putting to your transmissions? My line pressure in park stays around 150 psi and to me that seems a bit high. I tried raising duty cycle in holley and it had no effect on those numbers. My transmission does not give me any problems but i was just curious how you guys are dropping line pressure and could you share you setting with me. I have a 0-300 psi pressure sensor screwed in the npt port on the side on the case wired to holley terminator x max so im positive my readings are correct. Im measuring in dome pressure vs kpa since it turbo. My current setting are.
1st gear- 30, 30, 30, 20, 15
2nd gear- 30, 30, 30, 20, 10
3rd gear- 30, 30, 30, 20, 10
4th gear, 30, 30, 30, 20, 10
1st gear- 30, 30, 30, 20, 15
2nd gear- 30, 30, 30, 20, 10
3rd gear- 30, 30, 30, 20, 10
4th gear, 30, 30, 30, 20, 10
For those who dont know my setup is a single cab silverado with a piston & rod gen 4 5.3 with vs racing next gen 2.5 78/75. I have a 4l60e that is built to handle the power levels i putting at it with a rossler transbrake. I was wondering what kind of line pressure you guys are putting to your transmissions? My line pressure in park stays around 150 psi and to me that seems a bit high. I tried raising duty cycle in holley and it had no effect on those numbers. My transmission does not give me any problems but i was just curious how you guys are dropping line pressure and could you share you setting with me. I have a 0-300 psi pressure sensor screwed in the npt port on the side on the case wired to holley terminator x max so im positive my readings are correct. Im measuring in dome pressure vs kpa since it turbo. My current setting are.
1st gear- 30, 30, 30, 20, 15
2nd gear- 30, 30, 30, 20, 10
3rd gear- 30, 30, 30, 20, 10
4th gear, 30, 30, 30, 20, 10
1st gear- 30, 30, 30, 20, 15
2nd gear- 30, 30, 30, 20, 10
3rd gear- 30, 30, 30, 20, 10
4th gear, 30, 30, 30, 20, 10
Thread Starter
TECH Fanatic
Joined: Oct 2022
Posts: 1,778
Likes: 629
From: Louisiana
damn your pressure is set a little higher then mine and your psi is lower. Do you have a turbo and what temps were your transmission when you checked it? My trans temp was around 130.
Yep I've got an 88mm turbo and I run a big remote transmission cooler my temps on a hot summer day after usually in the sweet spot of 165-175. Your 130* temps is too cold
Thread Starter
TECH Fanatic
Joined: Oct 2022
Posts: 1,778
Likes: 629
From: Louisiana
I checked this last night and even though I live in Louisiana is was fairly cool last night and I have a Tru Cool 40k transcooler with dual fans. I let it run about 20 minutes in the driveway but thats about where the temps stayed. It will go up more if I were to go drive it but I still figured whether it was cool or not that my line pressure still should have been around the same. I could understand a few psi but was at 150 and I was hoping to see atleast 120 at idle and i wouldn't expect driving it that it would go down 30+ psi.
I checked this last night and even though I live in Louisiana is was fairly cool last night and I have a Tru Cool 40k transcooler with dual fans. I let it run about 20 minutes in the driveway but thats about where the temps stayed. It will go up more if I were to go drive it but I still figured whether it was cool or not that my line pressure still should have been around the same. I could understand a few psi but was at 150 and I was hoping to see atleast 120 at idle and i wouldn't expect driving it that it would go down 30+ psi.
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