I have 2 pullies and the biggest one still gives me around 9psi at 59xx rpm. Is there a way to bleed some boost off without changing pullies?

Would it work if I adjusted the bov to not fully close?

 

good question ttt for ya

 

something called a pop-off valve. I know Greddy makes one but that's the only company I've seen. It bleeds boost at an adjusted level with an adjusting screw.

 

Ahh, something I have to buy, lol.

 

long tubes and a highflowing catback will bleed some of the boost off.

 

How does belt driven boost lower with better flowing exhaust?
I can see that simply with a Turbo.

 

Boost is simply resistance to flow. If you increase the engine flow & the charger supplies the same amount of air, it will make less boost. This still increases efficiency & power. I have seen LS1 cars lose 2# boost with headers, exhaust & no cats, while still running substantially better.

 

a cheaper method would be to replace your bov with a plastic elbow(no valve). im sure youll loose quite a bit of boost this way.

but unlike less restrictive exhaust, you will loose power instead of gain it.

 

Pulley down if you have to. A BOV will lose boost, but you still have the same parasitic drag on the motor. Keep the boost, keep the boost .

Ryan

 

I already have a good exhaust but it wouldn't have made a difference anyway. Unless I change cams, boost will stay the same. The exhaust valve closes at the same time regardless of exhaust.

I am not going to totally throw away the bov so that is out. I would probably lose alot that way.

And 96speed, I would love to, but I want to keep the motor alive for at least a year.

 

Ooohhh, vaseline! I don't think so

 

um.. keep the 9psi.. dont get on it as much? Then it will last.. No matter how much boost your running.. you beat it, it will die..

 

What constitutes "beating". I have maybe made 4 full 1/4 mile passes since I got the blower on 8 months ago.

 

Restrict the inlet side of the blower....less air going into it=less air for it to compress=less boost.

 

do you have a boost gauge? if you do, you can experiment and see whats working and whats not.

the restriction on the inlet side of the blower sounds like a good idea.

i actually tried what i mentioned to you today. i replaced the BOV with a simple 1" elbow. its cheap so i thought id give it a try.

i dont have a boost gauge so i cant tell you how much boost it scrubbed off. i know its still boosting cause the ignition retard light comes on when i put my foot down so there is boost being sensed by the secondary MAP that came with the crane ignition/retard kit.

and also, the "but-O-meter" says im only loosing maybe 10 to 20ponies. but you know the but-O-meter isnt very accurate. but my point is, the car is still really friggin fast.

i think if your seeing 9psi right now, and you do replace the BOV with a regular elbow, i think you will still be satisfied with your power.

if you try it, let me know how much boost you lose.