Pressure

[J-B Racing]

Can anyone tell me how much pressure gain would be from a .500 to .570 Boost Valve.

Thanks
Joe

 

[bison]

Can anyone tell me how much pressure gain would be from a .500 to .570 Boost Valve.

Thanks
Joe

IMO too much. Id estimate you would be over 300psi if the reg valve was held nearly closed. About 215-220psi with the .500. My rec would be a .530 valve.

 

[J-B Racing]

IMO too much. Id estimate you would be over 300psi if the reg valve was held nearly closed. About 215-220psi with the .500. My rec would be a .530 valve.

Thank You very Much..:smile:

 

[WE4]

It shouldn't change the overall line pressure.....

Can anyone tell me how much pressure gain would be from a .500 to .570 Boost Valve.

Thanks
Joe

What the bigger valve does is raise line quicker and more steady but the PR spring and valve control overall line pressure so the answer to your question is not how much will it increase but how fast?
That is the reason you go to a bigger boost valve.
You would be fine with the bigger valve and BTW we now make them at .555 because we didn't notice very much difference between the .570 and .555 So with some people having trouble with the thin lip, we have left more material there now.
But like I said, the PR valve and spring control it.

Bruce
We4
Performance Transmission Services

 

[Turbo1dr]

What the bigger valve does is raise line quicker and more steady but the PR spring and valve control overall line pressure so the answer to your question is not how much will it increase but how fast?
That is the reason you go to a bigger boost valve.
You would be fine with the bigger valve and BTW we now make them at .555 because we didn't notice very much difference between the .570 and .555 So with some people having trouble with the thin lip, we have left more material there now.
But like I said, the PR valve and spring control it.

I'm more of a part throttle person when I drive my car which is 99.9% street driven about 5000 to 10,000 miles a year. It has plenty of passing power at 5 to 8psi of boost without going to WOT. Right now I have a .500 valve and was wondering if I really need the larger one to boost part throttle pressures?


Just a few weeks ago I burned the forward clutches out of the trans at the drag strip. After taking the trans apart, the backing plate's on the 4th clutch, direct and forward clutches are not flat. I suspect it is caused by excessive pressure??? Anything I can do to avoid this? Special hardened plates????

Car made 600HP at the rear wheels about two months ago. This was with a suspected bad trans.

 

[WE4]

Hrmmm...

I'm more of a part throttle person when I drive my car which is 99.9% street driven about 5000 to 10,000 miles a year. It has plenty of passing power at 5 to 8psi of boost without going to WOT. Right now I have a .500 valve and was wondering if I really need the larger one to boost part throttle pressures?


Just a few weeks ago I burned the forward clutches out of the trans at the drag strip. After taking the trans apart, the backing plate's on the 4th clutch, direct and forward clutches are not flat. I suspect it is caused by excessive pressure??? Anything I can do to avoid this? Special hardened plates????

Car made 600HP at the rear wheels about two months ago. This was with a suspected bad trans.

The valve would help you at part throttle. You won't "repair" a problem with them but they will help. As for the pressure plates not being flat, sounds like the trans was slipping real bad and warped them. I have never seen excessive pressure causing this unless there are other problems. If you had excessive pressure, the trans would have been taking off from a stop in 2nd gear. So a good rebuild looks like is in order.
Sorry to be the bearer of bad news but..... Toys are toys.

Bruce
WE4
Performance Transmission Services

 

[Turbo1dr]

Thanks. Didn't have a problem with it taking off in second. I'll be checking pressures after this rebuild.