big red race valve

[onequicktang]

is the procharger big red race valve able to adjust boost?

 

[t-kid]

No... that's what a "boost controller" is for... to control boost.

 

[fdjizm]

Nope that's just a blow off valve.

 

[lostsoul]

Nope that's just a blow off valve.

did you read that off the box in your closet?

 

[19COBRA93]

No... that's what a "boost controller" is for... to control boost.

A wastegate controls boost. A boost controller controls the wastegate.

 

[JeremyH]

is the procharger big red race valve able to adjust boost?

No.

 

[Doug M]

No... that's what a "boost controller" is for... to control boost.

A wastegate controls boost. A boost controller controls the wastegate.

ha ha,,

 

[fdjizm]

did you read that off the box in your closet?

I will have my revenge upon you infidel!

 

[onequicktang]

so pulleys are the only way to change boost? Im trying to get on the dyno next week and my pulley is suppose to make around 22psi and im looking for 17-19 but my gauge was only reading about 9psi.

 

[onequicktang]

so whats the adj bolt on top of the big red for?

 

[19COBRA93]

so whats the adj bolt on top of the big red for?

You can adjust how tight or loose you want the valve. If you tighten it up, it'll only slightly open at idle. With it loose, it'll be wide open at idle. Regardless of what you do with the bolt, it will be closed tight at WOT and have no effect on boost.

If you're only seeing 9lbs on a 22lb pulley you have a severe boost leak somewhere.

 

[t-kid]

A wastegate controls boost. A boost controller controls the wastegate.

really? I thought the boost controller just sat there... I assumed most people know that a boost controller is run to the wastegate... seeing as if you have a turboed car and don't run off the spring you would know this.

 

[19COBRA93]

I actually don't have a turbo'd car, but when I did (twin turbo 03 Cobra), I controlled boost with the wastegates only by swapping out springs.

 

[t-kid]

I actually don't have a turbo'd car, but when I did (twin turbo 03 Cobra), I controlled boost with the wastegates only by swapping out springs.

That's pretty hood rich.

 

[Godzirra]

so pulleys are the only way to change boost? Im trying to get on the dyno next week and my pulley is suppose to make around 22psi and im looking for 17-19 but my gauge was only reading about 9psi.

Seems like you've got some issues somewhere...
Pulley supposed to make 22.
You want 17-19
Gauge reads 9....
Need to go over for leaks in piping, intake mani torque'd to spec? etc....Check the gauge. No way pulley is supposed to make 22 and only making 9...

 

[matt06]

might also want to double check how tight the belt is, with a previous setup i thought the belt was tight enough and was running alot lower boost after talking to procharger a handful of times we just cranked it tighter and fixed it

 

[JeremyH]

The adjustment is to adjust your effective spring pressure in the bov based on your idle vaccuum for best performance.

 

[05stroker]

The adjustment is to adjust your effective spring pressure in the bov based on your idle vaccuum for best performance.

I assume if you have less vac. you would back off the spring some?

 

[JeremyH]

Correct. For a supercharger setup to make it the most repsonsive you would adjust it at idle so the spring is just barely weaker than vac, enough for vac to overcome the spring and stay open at idle and then it should fully snap shut right away when you rev it and the vac goes away. On a turbo car you want the opposite, you want spring pressure strong enough to keep to the bov fully closed at idle and be stronger than vac, then it should snap open after a rev at idle then shut again. This is due to the way blowers move alot more air at idle comapred to a turbo with no load.

 

[05stroker]

Correct. For a supercharger setup to make it the most repsonsive you would adjust it at idle so the spring is just barely weaker than vac, enough for vac to overcome the spring and stay open at idle and then it should fully snap shut right away when you rev it and the vac goes away. On a turbo car you want the opposite, you want spring pressure strong enough to keep to the bov fully closed at idle and be stronger than vac, then it should snap open after a rev at idle then shut again. This is due to the way blowers move alot more air at idle comapred to a turbo with no load.

Interesting, I will check mine with the new cams then.