Help! Trans Pressure in 4L60E
Thread Starter
Joined: Sep 2004
Posts: 2,013
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From: Hicksville MN!
Help! Trans Pressure in 4L60E Guys what are you all recommending for WOT line pressure on a 4L60E? Internally this thing is built to the hilt so no worries here. Keep in mind i am running the factory PCM and force motor yet. I am at about 270 psi now WOT and at part apply around town its 225. Is this safe? I have some of the tables in the tune changed to help this and the screw in the force motor has been cranked about a 1/4 turn. The only problem i am having now is when it's at idle it's at about 150 psi and when i go to put it in drive with the brake applied the pressure jumps to about 225 and lugs the motor down and the driveline clunks at the same time. Any ideas on this? Should i go back to the stock apply pressures in the tune and leave the screw in a 1/4 turn?? Please help.............
What is stock pressure suppose to be at in drive at idle??
What is stock pressure suppose to be at in drive at idle??
Minimum mechanical line pressure should be at least 190 psi.
This cannot be raised by electronics.
Maximum line pressure should not need to go above 240 psi.
A 4L60E in good condition with a transgo .500 boost valve and spring will have 236psi.
With the transgo white actuator valve spring it will have 3 to 4 psi more.
You really need to put a gauge on it and adjust the EPC back to normal.
This cannot be raised by electronics.
Maximum line pressure should not need to go above 240 psi.
A 4L60E in good condition with a transgo .500 boost valve and spring will have 236psi.
With the transgo white actuator valve spring it will have 3 to 4 psi more.
You really need to put a gauge on it and adjust the EPC back to normal.
Thread Starter
Joined: Sep 2004
Posts: 2,013
Likes: 85
From: Hicksville MN!
Minimum mechanical line pressure should be at least 190 psi.
This cannot be raised by electronics.
Maximum line pressure should not need to go above 240 psi.
A 4L60E in good condition with a transgo .500 boost valve and spring will have 236psi.
With the transgo white actuator valve spring it will have 3 to 4 psi more.
You really need to put a gauge on it and adjust the EPC back to normal.
This cannot be raised by electronics.
Maximum line pressure should not need to go above 240 psi.
A 4L60E in good condition with a transgo .500 boost valve and spring will have 236psi.
With the transgo white actuator valve spring it will have 3 to 4 psi more.
You really need to put a gauge on it and adjust the EPC back to normal.
Last edited by ramairws6; Jul 4, 2010 at 11:18 PM.
Are you saying at closed throttle?
I would say more like 70-80PSI at idle.
I would shoot for 210-230psi depending on the combo myself. More pressure is not always the solution for transmission life. I personally have seen many hard part failures to to excessive line pressure. With that being said use what I have suggested and I think you will be fine.
Ramairws6 my suggestion would be to get the stock pressure tables back in this trans and get the epc adjusted accordingly. You are not doing your trans any favors by what you are doing! Vince
I would say more like 70-80PSI at idle. This cannot be raised by electronics.
Maximum line pressure should not need to go above 240 psi.
A 4L60E in good condition with a transgo .500 boost valve and spring will have 236psi.
With the transgo white actuator valve spring it will have 3 to 4 psi more.
You really need to put a gauge on it and adjust the EPC back to normal.
Maximum line pressure should not need to go above 240 psi.
A 4L60E in good condition with a transgo .500 boost valve and spring will have 236psi.
With the transgo white actuator valve spring it will have 3 to 4 psi more.
You really need to put a gauge on it and adjust the EPC back to normal.
Ramairws6 my suggestion would be to get the stock pressure tables back in this trans and get the epc adjusted accordingly. You are not doing your trans any favors by what you are doing! Vince
Max line pressure should be 190 minimum and 240 maximum. This is with no EPC solenoid bleed off, such as when max line is being set and the EPC is disconnected electrically. Or when at WOT.
If max mechanical line pressure is set 190 to 240 the pressure with the epc connected should be within range at idle and part throttle (depending on computer tuning) but should be verified with a mechanical gauge.
I have the transgo kit and low mileage trans, it gets 70 psi at idle and 235-240 wot.
Last edited by Jays_SSZ28; Jul 5, 2010 at 11:06 AM.
Thread Starter
Joined: Sep 2004
Posts: 2,013
Likes: 85
From: Hicksville MN!
Are you saying at closed throttle? I would say more like 70-80PSI at idle.
I would shoot for 210-230psi depending on the combo myself. More pressure is not always the solution for transmission life. I personally have seen many hard part failures to to excessive line pressure. With that being said use what I have suggested and I think you will be fine.
Ramairws6 my suggestion would be to get the stock pressure tables back in this trans and get the epc adjusted accordingly. You are not doing your trans any favors by what you are doing! Vince
I would say more like 70-80PSI at idle. I would shoot for 210-230psi depending on the combo myself. More pressure is not always the solution for transmission life. I personally have seen many hard part failures to to excessive line pressure. With that being said use what I have suggested and I think you will be fine.
Ramairws6 my suggestion would be to get the stock pressure tables back in this trans and get the epc adjusted accordingly. You are not doing your trans any favors by what you are doing! Vince
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Verdad Gallardo Thread Starter
Joined: Sep 2004
Posts: 2,013
Likes: 85
From: Hicksville MN!
Ok, i dropped the pan and turned the force motor back a 1/4 turn. I seem like i gained quite a bit except for when i go from Park/Neutral to drive i still get the aggressive driveline clunk. If i watch my force motor amperage on my Tech II it goes from .9 amps to .6 amps going into drive and this is my problem with line pressure rise. I think my tune is jacked so i will have to go back to the stock tune and start from there??
Thread Starter
Joined: Sep 2004
Posts: 2,013
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From: Hicksville MN!
Make sure the force motor current table is stock.
Make sure the Base Shift Pressure vs Torque vs Gear is stock.
Any other pressure constant table should be at zero (stock)
Then adjust the EPC back to a normal range.
Thread Starter
Joined: Sep 2004
Posts: 2,013
Likes: 85
From: Hicksville MN!
If thats the case then I don't know what the problem is.
Make sure the force motor current table is stock.
Make sure the Base Shift Pressure vs Torque vs Gear is stock.
Any other pressure constant table should be at zero (stock)
Then adjust the EPC back to a normal range.
Make sure the force motor current table is stock.
Make sure the Base Shift Pressure vs Torque vs Gear is stock.
Any other pressure constant table should be at zero (stock)
Then adjust the EPC back to a normal range.
You don't seem to want to take advice, so don't. Just leave it alone.
Thread Starter
Joined: Sep 2004
Posts: 2,013
Likes: 85
From: Hicksville MN!
Thread Starter
Joined: Sep 2004
Posts: 2,013
Likes: 85
From: Hicksville MN!
