need help lowering trans line pressure
12-12-2009, 12:54 AM
#1
On The Tree
Thread Starter
iTrader: (24)
Join Date: Nov 2007
Posts: 157
Likes: 0
Received 0 Likes
on
0 Posts
need help lowering trans line pressure hi,
anyone around the melbourne area that has hp tuners. i had my pcm tuned and my line pressures might be to high. i want to lower my transmission line pressures. i blew out my trans pump and the trans people think its because my line pressures are set to high. is there someone that could help me out. this is costing me a pretty penny just to have a pump installed and i don't want to put the new pump in and have it happen again. please someone help me out. thanks
anyone around the melbourne area that has hp tuners. i had my pcm tuned and my line pressures might be to high. i want to lower my transmission line pressures. i blew out my trans pump and the trans people think its because my line pressures are set to high. is there someone that could help me out. this is costing me a pretty penny just to have a pump installed and i don't want to put the new pump in and have it happen again. please someone help me out. thanks
12-13-2009, 07:10 PM
#2
12 Second Club
iTrader: (22)
Join Date: Nov 2005
Location: above you
Posts: 546
Likes: 0
Received 0 Likes
on
0 Posts
you can do it manually. by dropping the pan. and turning the set screw like an 1/8 of a turn to the left to reduce line pressure. do a search and see if there is more information on it, dont do it if you dont know what your doing,
12-14-2009, 11:15 AM
#3
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,605
Likes: 0
Received 6 Likes
on
6 Posts
I would point the finger at that re-re-stalled converter,
not the PCM settings. Line pressure max is something
any OE pump should be able to push against indefinitely.
And the hard max is set by that blowoff valve (the screw)
with the soft settings knocking it down from there.
Lower the pressure too much, and you'll start killing the
frictions instead.
If you are after an absolute pressure, you need someone
with trans line pressure gauges. If line pressure is within
limits at idle & WOT, then you can look elsewhere for the
pump-killer. Have the trans shop test line pressure on the
lift and on the road, then make up your mind.
I don't know as I'd put that converter back in again, sure
not without checking balance and runout.
not the PCM settings. Line pressure max is something
any OE pump should be able to push against indefinitely.
And the hard max is set by that blowoff valve (the screw)
with the soft settings knocking it down from there.
Lower the pressure too much, and you'll start killing the
frictions instead.
If you are after an absolute pressure, you need someone
with trans line pressure gauges. If line pressure is within
limits at idle & WOT, then you can look elsewhere for the
pump-killer. Have the trans shop test line pressure on the
lift and on the road, then make up your mind.
I don't know as I'd put that converter back in again, sure
not without checking balance and runout.
12-15-2009, 08:43 AM
#4
If the TC did not have enough free-play between the flexplate & the converter slide all the way back into the tranny (1/8" to 1/4") then the converter snout will bind against the pump & take it out in no time.
Allthough the line pressure in the tune can be tweaked up, if you have a trans shift kit in the tranny it also raises the line pressure so any additional in the tune can cause to much pressure blowing through the seals, but it usually takes out the 2-3 clutch paks, not the pump.
A quick look at your tune will show max line pressure, but I would look at the TC pushing on the pump.
Allthough the line pressure in the tune can be tweaked up, if you have a trans shift kit in the tranny it also raises the line pressure so any additional in the tune can cause to much pressure blowing through the seals, but it usually takes out the 2-3 clutch paks, not the pump.
A quick look at your tune will show max line pressure, but I would look at the TC pushing on the pump.