bigpoppa822
Registered User
See first post.
Last edited:
What gasket or gasket maker is being used on the IC lines?
Is there one behind the nut?
Does the SC have a raised top?
Vac lines can be brand new, but are they routed correctly?
Gauge as mentioned would be the first look.
Inlet and return plenums ever been removed?
If they have been removed what gasket was used?
Same with the hat which gasket was used?
Had bad gasket leaks with the poly gaskets. Tighten the bolts to spec and could hear the air going past those gaskets especiallly with the hat.
Belt slip.....
Bumpity Bump.
I have a new ported 94 blower on running 13%OD. I am getting only 11psi up top, I'm pretty sure it should be making a lot more than that. Still has the GTP rotors in it, coating has a couple knicks in it but is in good condition. I swapped intercoolers yesterday (stockies, I know don't yell at me for running that much OD on a stock IC, front mount stuff is coming soon.)
Anyway, car pulls well, but only 11psi is discouraging and makes me think something is wrong somewhere. All vacuum lines are brand new, and I have MP springs in the tensioners (not clocked, stock pulley).
Anyone have any insight to what's going on?
If you are overdriving all 13% from the supercharger pulley, then it probably is belt slip. The pully can become very slick and won't grip very well...sandblasting the belt contact surface helps. Sometimes machining the tips of the ribs down a little will provide better fit for the belt into the grooves/ribs of the pulley.
Overdriving 10% from the jackshaft and only 3% from the supercharger pulley will work much better.
David