Procharger belt problems!!! Please help..
Procharger belt problems!!! Please help.. Ok I running a 370 c.i. motor 225 72 cc AFR heads Fast 92 intake and tb.. procharger blow off valve..Trying to make 16 lbs of boost.. I can only get it to make 10.. The belt is pretty tight.. What do I need to check?
Ds1 and 3.55 and Im not sure about the crank pulley but its the same size as the balancer I think 7.25 .. Its an 8 rib setup..
Last edited by Kiss_My_99SS; Jun 6, 2009 at 10:26 AM.
Look to see if you have any black dust on the head unit, which would indicate belt slippage.
What air filter are you using? If it is the stock ProCharger filter, you'll need a larger one to see 16 psi of boost. Try making one run without the filter, if it is too small you'll pick up boost.
The bypass valve should only have a small airgap when in the closed position, if it has too wide of a gap, you'll lose boost.
If all of the above items don't take care of it, and provided you're not up at 5000+ ft in elevation, I would suggest taking off the intercooler to throttle body hose at the throttle body, and the other end where it comes out of the blower. Block off one end and pressurize the other end to see if you have boost leaking out anywhere. We had an intercooler several years ago that had a pinhole in it, it can also leak out at connections. The easiest way to pressurize the other end of the tubing is to cap it off but drill a hole in it and install a shrader valve. Bob
What air filter are you using? If it is the stock ProCharger filter, you'll need a larger one to see 16 psi of boost. Try making one run without the filter, if it is too small you'll pick up boost.
The bypass valve should only have a small airgap when in the closed position, if it has too wide of a gap, you'll lose boost.
If all of the above items don't take care of it, and provided you're not up at 5000+ ft in elevation, I would suggest taking off the intercooler to throttle body hose at the throttle body, and the other end where it comes out of the blower. Block off one end and pressurize the other end to see if you have boost leaking out anywhere. We had an intercooler several years ago that had a pinhole in it, it can also leak out at connections. The easiest way to pressurize the other end of the tubing is to cap it off but drill a hole in it and install a shrader valve. Bob
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Which crank pulley and blower pulley are you using? Mine only made 10 on a 7.65 and 4.5", changed it up and has the 7.65 but with the 3.4" now, makes 19psi on the dyno with no filter, 17ish with it.
After you figure out if you have more potential out of a differnet/smaller pulley combo, and you are already running a huge air filter, I would also take a look at what kind of inlet tube you are using. If its the plastic one that came with the D1SC, then that can be a big robber of boost. Just from swapping air filters and going with a custom metal inlet tube, I went from 9#'s of boost to 15#'s and gained over 100 RWHP. If you still aren't getting enough, I would possibly upgrade to a 12 ribbed setup (thats what I am running) and a good tensioner to make sure your belt isn't slipping.
Past that, you can also try using meth instead of the intercooler (as Bob mentioned). Intercoolers have been known to rob a pound or two. Finally, depending on what cam you are running you may not have an ideal blower cam that could potentially give you more boost. Finally, with AFR 227 heads you need to consider that boost is a measure of restriction, and having large heads like that are not restrictive and although they can have an end result of more power, they may not be as restrictive as smaller ones that will show more boost. I am running AFR 180 heads that have been fully ported on my setup.
Past that, you can also try using meth instead of the intercooler (as Bob mentioned). Intercoolers have been known to rob a pound or two. Finally, depending on what cam you are running you may not have an ideal blower cam that could potentially give you more boost. Finally, with AFR 227 heads you need to consider that boost is a measure of restriction, and having large heads like that are not restrictive and although they can have an end result of more power, they may not be as restrictive as smaller ones that will show more boost. I am running AFR 180 heads that have been fully ported on my setup.
I'm running a epp front mount intercooler and piping..I noticed that the elbow swells up a lot. I'm also running their blower cam..I pulled off the filter and still only 10 lbs...
