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Old 03-04-2008, 05:59 PM   #1
Ginsu
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Member#: 112882
Join Date: Apr 2006
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2002 Stg4 WRX Wagon
4EAT PSM

Default Low line pressure in 4eat

quick story...bought a brand new 4eat and had IPT valvebody and Protorque TC installed and everything was good for over a year...Do to the joys of PA roads, ended up putting a hole in the tranny filter and lost all my fluid and burned up that tranny...having a buddy who owns a local performance shop rebuild the tranny from ground up with a level 10 rebuild kit and the tc is being rebuilt, etc...he said he found abnormal wear on parts b/c of low line pressure (outside of the fact that it was fried) and he's waiting to hear back from a couple of places about what he can do to increase said pressure (IPT being one of them)...Now i thought that having the VB upgrade increased the line pressure...looking for ideas and suggestions about what the heck happened...lol
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Old 03-05-2008, 06:28 AM   #2
Ginsu
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bump for any help...or if anyone has a solution to increasing line pressure
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Old 03-05-2008, 12:33 PM   #3
romanlynch
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well the low line pressure could be caused by low fluid, bad pump, clogged filter, but my boss (owns his own trans shop and been a trans guy for 20+ yrs) said its near impossible to say that there could be abnormal wear cause by low line pressure if the trans is already fried.

NOT to say that your buddy doesnt know what he's talking about, just trying to say how could you tell if everything is already burned up?

the line pressure is controlled by the ECU through a solenoid, there might be a flash that you could do, but not sure
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Old 03-05-2008, 06:41 PM   #4
Ginsu
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2002 Stg4 WRX Wagon
4EAT PSM

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Basically i was leaking fluid slowly through the external filter for about 2 weeks, before I noticed it...then when the new filter was put on, the o-ring blew out on it and that did in the trans...when he did the tear down, it was the seals that were fried and he said the rest of the internals showed abnormal wear...I haven't seen it for myself and wouldn't know what i was looking at if i did, not a trans guy, but i don't think he would steer me wrong...i was going to have him loosen the TC more, but he said he didn't feel comfortable doing it unless he can increase line pressure...do you think an upgraded solenoid would work, but that goes back to the valve body and isn't that part of the IPT valve body upgrade? Forgive my ignorance, it's my fault for not understanding everything i was getting on the VB when i got it i guess...lol...My car is tuned with Ecutek, should I talk to my tuner to see if there is something he can do? or would it be more of a SOA flash?
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Old 03-06-2008, 12:39 PM   #5
romanlynch
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again i did not mean to bring in question your mechanic knowledge or anything i was just passing on what my boss had mentioned.

Anyways not sure what you mean by "loosen the torque converter". as for the solenoids you would have to contact IPT about that, they may just call for the OE ones, or they may use their own.

as far as the flash, i would think if anyone would have an update then it would be subaru. i dont know, but i dont think that anything like ecutek would be able to do anything with the trans.
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Old 03-06-2008, 03:31 PM   #6
Ginsu
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No, don't misunderstand me, I knew what you were saying and I greatly appreciate the advice from you and your boss...it gives me something to pass along b/c he was "lost"...I meant bumping the stall up from ~2800 to ~3000 or a little higher with TC...I'm not a mechanic nor do I play one on TV...I know only what i read on these forums...NASIOC=good...lol
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Old 03-07-2008, 12:55 PM   #7
romanlynch
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PLATINUM silver baby

Default

well goin to a higher stall tc wouldnt increase the line pressure. stall speed is when you have the car in gear and press the brake and gas at the same time, also called power braking, the engine will only rev up to a certain RPM, that is your stall speed. goin to a higher stall speed for a DD would eventually be bad because you would have to rev the ish out of the car to get it to go anywhere. i think you should call IPT and talk to them about the kit that you have, and see if there is anything that they could recommend.
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Old 03-07-2008, 04:20 PM   #8
Ginsu
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4EAT PSM

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The TC thing wasn't for the line pressure, he actually want's to increase the pressure b/c of bumping the stall...I spoke with him today, he said the solenoid on the VB looks stock and he has waiting on a return from IPT about an upgraded 'noid...he also has a call into someone he knows who writes custom programs for engine tuning to see what he has/can do for my suby...so right now its a waiting game...Thanx for your help, b/c it got the ball rolling in a few directions.
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Old 03-08-2008, 08:09 PM   #9
romanlynch
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PLATINUM silver baby

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glad i could help, whats the stall speed of the tc now? why do you want to bump that up at all?
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Old 03-09-2008, 12:06 AM   #10
Ginsu
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2002 Stg4 WRX Wagon
4EAT PSM

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I believe stock is 2600rpm, and i bought an OTS protorque one and it's around 2800rpm...i want it at 3 b/c of my VF30...help me offset lag lag by higher stall
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Old 03-10-2008, 12:54 PM   #11
romanlynch
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Vehicle:
02 wrx
PLATINUM silver baby

Default

ah, okie dokie.
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