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1G W4A33 line pressure

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SasaniFab

Proven Member
2,433
782
Dec 1, 2013
Mexico, Connecticut
I wanted to pass this along as it was brought to my attention. Most guys , if not all guys running this transmission are using the standard shift kit offered and have the line pressure adjustment either maxed out or nearly maxed out along with the reducing pressure. When they logged the line pressure they were seeing 150 psi Max. According to Kiggly for guys making decent power you should have at least 200psi. They decided to add a 4mm shim and will be taking the car out later. I’m Interested to see what the pressure is after this adjustment.
 

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There is a spring kit that's available now that includes a pr spring and a tcc regulator spring.
Would those 2 spring upgrades be fine for street driving? Pretty sure I have just the normal shift kit, purchased back in 2010, curious to know if it’s a big difference or not. Is it possible to have too much line pressure for the street? I don’t care for comfort.
 
Too much pressure can break hard parts, shimming is really not the cure on this kind of thing, its needs the right spring, sure shimming can get results but your then limiting spring travel and getting closer to coil bind, its really better to just use a proper spring.
 
I have the IPT upgraded spring, I've never measured line pressure, it was recommended by Kiggly to shim to increase line pressure.

I have a race car, is it necessary on the street? Probably not, as Matt said, it can be hard on parts. I have billet front and rear baskets so this doesn’t really apply to me. I just thought I’d share the information.
 
Last edited by a moderator:
Thanks so much for the RESULTS. Thats what this forum is about.
@transdude is a very good source, believe me.
@transdude, I need that kit. Can you link it here in this thread?
Thanks John!
I need to PM you.
Marty
 
is this John from ipt ? If it is ... had no idea LOL. If it is .... what line pressure should I expect with your spring?
The MAN himself!!!! :thumb: I have to chuckle OMG ROFL
 
Thanks guys. A spring kit should get at least 150psi in a healthy transmission.

I think that it is of importance to note that line pressure is certainly only a part of the equation in getting any transmission to handle more power.

Rewind to 1989 to my first "KM" transmission build in my mom's driveway/garage- on my neighbor's 1985 Gallant I was cranking on those adjusters LOL
 
Mine is almost done now finally. Curious though but which parts take the abuse with high line pressure? I have the upgraded 2 spring kit with a ratchet shifter. Would be nice to drive on the street from time to time. Real kick in the buttocks on shifts?
 
I think it's gonna depend on how much you grip the road. With drag radials, it will hook and that will be rough on gears and cv joints.
 
Mine is almost done now finally. Curious though but which parts take the abuse with high line pressure? I have the upgraded 2 spring kit with a ratchet shifter. Would be nice to drive on the street from time to time. Real kick in the buttocks on shifts?
It should absolutely shift hard- you are not controlling reducing pressure via the solenoid, it's at full pressure regardless of throttle opening the way it's set up now.
 
I wanted to pass this along as it was brought to my attention. Most guys , if not all guys running this transmission are using the standard shift kit offered and have the line pressure adjustment either maxed out or nearly maxed out along with the reducing pressure. When they logged the line pressure they were seeing 150 psi Max. According to Kiggly for guys making decent power you should have at least 200psi. They decided to add a 4mm shim and will be taking the car out later. I’m Interested to see what the pressure is after this adjustment.

Good info just what I was looking for. Which port on the trans are you using to log line pressure?
 
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