I'm only boosting around 8psi on my ls1. I have it located about a foot away from the d1sc. Tuner said it doesn't seem to be bypassing enough air and throwing off the MAF. Should the bov be closer to the throttle body or is there a way to check to see if the bov is working properly?

 

Which BOV do you have, the one that comes stock with the D1sc is crap, you need the bigger"Red" one. I have heard that people had to put two of the smaler stock ones when running a MAF set up

 

Im running the stock one and pushing 9lb no problem. It is located near the charger as well

 

I'm pushing 15 psi, mine is just before my 90* turn into the intercooler. I'm using a vortech race bypass valve though.
And X2 on the "big red" bypass valve.

 

I have a front mount intercooler on it. And the BOV is the black aluminum one procharger sells. I guess at idle the blower is pushing too much air and it's hitting against the closed throttle body and that's throwing off the MAF. It only happens at idle or just slight throttle. When i'm just driving it it's fine.

 

That would mean it's not big enough....

 

Can you mount the bypass valve before the intercooler? We've successfully used the standard black Proflow bypass valve up through 14 psi without any problems. If you can't relocate it, then I would go with the Race bypass valve.

http://shop.brutespeed.com/ATI-3FASS...-3FASS-004.htm Alum flange
http://shop.brutespeed.com/ATI-3FASS...-3FASS-008.htm Steel flange
Bob

 

The by pass valve is located before the intercooler. It is like a foot away from the blower and right before the bend going into the intercooler.

 

The bypass valve should be plenty large enough for your application. Do you have it dumping at atmosphere or is it recirculating? Bob

 

It's dumping into the atmosphere. I don't really want to go speed density now either because i've spent about a grand at the tuner already.I'm going to take my bumper off and check to see that the bpv is opening up all the way but i'm pretty sure it is. I can feel plenty of air coming out of it at idle. So the location i have the bpv is okay right?

 

The location is basically where it is on the as delivered ProCharger systems. If all else fails, I would add a second bypass valve up by the maf, and keep the one where you have it too as it keeps hot air from entering the intercooler until getting into the throttle. Bob

 

Thanks bob that was the other thing i was thinking about doing.

 

Would it be better to run two Pro-Flow BPVs or one Big Red if you're trying to make the most power possible? I'm running the F-body twins with a soon to be maxed out D1. Thanks.

 

if you need a second procharger bypass valve, i have one im not using, pm if interested

 

Is it ok to have my proflo bypass valve dumping into the atmosphere or could that be part of my problem?

 

That is perfectly fine. Bob

 

Should a bypass venting directly to atmosphere be a concern since there is no filter?

 

I have seen people atach a filter to the end that would usually route air back into plastic piping neerest the intercooler.

 

My question was based on that I am assuming the valve is open when the motor is creating vacuum. If true, the vacuum will suck in stuff as you drive around.

 

No, because the blower will be moving more air than the engine can take in at idle and cruising conditions, so air will always be flowing OUT of the valve.