Hi folks, I am getting ready to go into my 700R4 to do some more mods and correct some errors I made in last winter's build. I did before work pressure tests this morning and got some troubling results. Minimum TV, in P, N, D, 3 @ 1,000rpm, pressure is 90psi which is fine. But then in reverse, pressure @ 1,000 is only 110. In manual 1st and 2nd, pressure @ 1,000 is still just 90 psi. Full TV, pressure in P is 105. N is 110. D is 95. Man 3rd is 100. Man 1st and 2nd is 100. When I raise rpm to 2,000, pressures @ full TV are P & N- 220, R-210, D 190, 3-200, 1&2-210. Gauge is steady(no wiggly needle). In R, D and 3, when I rev the motor with the TV locked full open, pressure jumps to 240 before falling back off to the readings listed above. I wonder if that might be the pressure relief valve opening. I would like that to hold til 300psi if possible.
The unit has a .296 rev boost valve and the .500 TV boost valve with a high rate regulator valve spring. I have dual springs on the line bias valve and a new 10 vane pump. I expected much better readings. My ignorance is that I put the unit together and drove it most of the summer without pressure testing. Won't make that mistake again. To make things worse, the TCC never worked since the build and I know I got it hot. I know that there are probably several things that could cause this kind of behavior. Does anyone have any thoughts? What jumps to the front of your mind? Sealing ring(s)? Damaged pump? Gasket blown? I plan to go into the unit first thing in the morning and have the weekend to get it back together. I have a full gasket set, new sealing rings, and some other goodies to put in it. If I need other parts, I will need to run to Portland tomorrow to get them. Up side is that it is coming winter and I don't drive the car in anything but sunshine. Worst case is I find something wasted that I can't get tomorrow, I put it back together best I can, limp it home and go back in later better prepared. Moral of this story is pressure test before you drive it. Damn!
I am very thankful for any help. Go ahead and chew my butt. I've earned it.
The unit has a .296 rev boost valve and the .500 TV boost valve with a high rate regulator valve spring. I have dual springs on the line bias valve and a new 10 vane pump. I expected much better readings. My ignorance is that I put the unit together and drove it most of the summer without pressure testing. Won't make that mistake again. To make things worse, the TCC never worked since the build and I know I got it hot. I know that there are probably several things that could cause this kind of behavior. Does anyone have any thoughts? What jumps to the front of your mind? Sealing ring(s)? Damaged pump? Gasket blown? I plan to go into the unit first thing in the morning and have the weekend to get it back together. I have a full gasket set, new sealing rings, and some other goodies to put in it. If I need other parts, I will need to run to Portland tomorrow to get them. Up side is that it is coming winter and I don't drive the car in anything but sunshine. Worst case is I find something wasted that I can't get tomorrow, I put it back together best I can, limp it home and go back in later better prepared. Moral of this story is pressure test before you drive it. Damn!
I am very thankful for any help. Go ahead and chew my butt. I've earned it.