Boost leak
I'm running out of ideas on this one, so I'm throwing it out to the group for help. A few months ago, I picked up an 03s with 130k on the clock. Po bought it with a bad head gasket, had his friend (a BMW mechanic) repair that, also found supercharger was shot. Sent it to Dustin at stateline for a rebuild, slapped it in with a 15% pulley, just started driving it and found out he had stage 4 cancer. I picked it up from him in June and have been driving it since.
Aside from the pulley its stock. I decided to add a boost gauge and I'm only seeing a max of 10psi, and it starts around 6psi ar lower rpms. With the pulley, I understand I should be up near 15 psi or so? so in my quest to correct it, I've done the following: -checked pulley isn't slipping on sc shaft, replaced belt -checked bpv function with vac gauge, adjusted set screw so it closes pretty well -pressure checked from throttle body to head. Looks tight, changed out a bunch of gaskets that were leaky or questionable(intake mani, mani horn to ic, ic boots, injector o rings, throttle body gasket, sc inlet) -tried vgs mod to see if it helped. No real improvement. at this point, I'm about out of ideas. Last few thoughts: -supercharger not producing enough boost (but Dustin seems like the go to guy for rebuilds) -bpv leaking back into intake tract (looks like it seals ok visually, but I dont know how tight it should seal?) -withcraft or bad juju from rocking Japanese cars my entire life until now. any ideas? She runs good, but I feel like I should be getting more from it and its driving me nuts! Thanks all! |
Guys, since the last post I have changed out the crank pulley as it was looking pretty tattered and I feared it might be failing, however that didnt fix it. Still cant get beyond ~10psi.
I'm losing my mind here. My last few guesses, which I really dont want to just shotgun because I'm tired of spending money: -bpv leaking by, even though it looks and behaves correctly -belt slip due to tensioner issue? Not sure how to test this -bad supercharger rebuild, which again seems unlikely anyone have any thoughts at all? I know this car can do more and its killing me not knowing what's wrong... thanks!! |
How does it run on the road? |
Originally Posted by Tgriffithjr
(Post 4425828)
How does it run on the road? thanks! |
We've seen improper rebuilt superchargers only make 10psi before. So I would be checking that.
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Did you connect into the pressure regulator line under the intercooler? Or the intake manifold? |
Originally Posted by Tgriffithjr
(Post 4425848)
Did you connect into the pressure regulator line under the intercooler? Or the intake manifold? |
Originally Posted by WayMotorWorks
(Post 4425845)
We've seen improper rebuilt superchargers only make 10psi before. So I would be checking that.
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