what trannie pressures readings should you expect?

[wiked87gn]

what trannie pressures readings should you expect in all gears with the car at idle temperatures?

 

[wiked87gn]

anybody, comon 26 views and nobody knows the answer to this question?

 

[lost2a6]

It depends on your tranny build. A high performance application should be around 220-240 at full TV above 1000 RPM's. Slightly less at idle, but not much.

 

[Firechicken]

These are the pressure readings I get from my stock 7 vane pump with upgraded pressure regulator system(.500 boost valve and .296 low/rev boost valve and purple spring).

1000 Idle trans hot
.......Min TV............Max TV
Park....95...................250
Rev.....145.................200
Neut...95...................250
D4......95...................235
D3......95...................240
D2.....240-245...........240
D1.....230-235...........230

 

[wiked87gn]

thanks a lot, my trannie after build, wont go over 150 even on low 1st gear and some are about 100 pressure, shifts are very soft and cant even feel them even after adjusting TV cable to max it doesn't make a difference, when you mean max tv setting what do you mean? oh yeah this is an ART Carr build trannie with all the goodies in it, cost total $2,600.00 including 9"NL 3,500 stall..

 

[WE4]

Well the one we built today.

here is how we test them and this is in a car an 84 Regal with a 327 Chevy
PTSX, shown below.

park idle 120 1/2tv@1500rpm 240 fulltv@1500rpm 345
Reverse idle 200 1/2tv@1500 rpm 325 fulltv@1500 rpm 355
neutral same as park
od idle 120 1/2tv@1500 rpm 285 fulltv@1500 rpm 345
d idle 120 1/2tv@1500rpm 285 fulltv@1500rpm 345
2 idle 200 1/.2tv@1500rpm 300 fulltv@1500rpm 355
1 idle 200 1/2tv@1500rpm 295 fulltv@1500rpm 345

the reason 1st is lower than 2nd at 1/2 tv and full t/v is because I drill a tiny hole in the piston for bleed. This in turn drops the pressure. Now these readins were taken at 160 degree trans temp. So I took it out and got it hot to 200 degrees. Pressures didn't vary 10 psi anywhere afterwards. I even have to admit, this was one tight unit. Works bitchin. Sweet on the bottom but lay your foot into it and it comes alive.

Normally you are looking for at LEAST 90 at idle for a hp unit 75 for a stocker.
Boost in reverse should be at least 180 200.
boost in low1 and low2 should be at least the same if not 10 or so pounds less. At full tv park & Neutral should be 240 or so and reverse and 1,2 should be 260 or better. Alot has to do with the set up tho and the components used.
We have found the chrome moly rotors and slides to not loose much at temp. I mean no more than 5-8 pounds. Even at 220 degrees we didn't loose more than 10 but at 320-345 it doesn't have much effect.
Now the stock stuff set up without cking the cleareneces can drop 20-50 pounds when hot. Test nice at cold temp but get it hot and see what happens. Cushioned correctly and set up correctly these pressures will not hurt anything but help to extend the life of the trans. Both in temp and in volume.
One very critical part to the operation of this trans is the pump. The thread Strengthening the 2004r
http://www.ptsnctb.com/faq/display_faq.asp?faq_id=4
is good reading and explains what to do to set up the pump correctly. Done properly, you would be surprised how well it makes everything work correctly.

Hope this sheds some light on what you were looking for.
:biggrin:

 

[wiked87gn]

thanks very much bruce that helps a lot...

 

[Firechicken]

By the way, full(Max)TV is found when you disconnect the TV cable from the linkage and have someone pull it out to max while you keep RPM steady and record the pressure.