Swapped pulley, same boost as before
Thread Starter
Burning Brakes
Joined: Jun 2009
Posts: 1,065
Likes: 7
From: Madison, MS
Swapped pulley, same boost as before
I have a 98 coupe, with a p1sc, dual front mount intercoolers. I have long tubes, full exhaust, ls6 intake.. On my 4.25 pulley I was right around 5psi. That was with a 92.5 belt, 6rib.. I swapped on a 3.85 pulley today, and used a 91.0 6rib belt.. At wot, I am right around 4.5 psi now.
I don't think I have belt slip, as there is no noise, and the boost stays constant, but I am not 100% sure.
Tomorrow I am going to check all my piping fittings, air filter inlet, and bypass valve. Any other suggestions would be very helpful. I was hoping to see 7-8psi with this smaller pulley.
I don't think I have belt slip, as there is no noise, and the boost stays constant, but I am not 100% sure.
Tomorrow I am going to check all my piping fittings, air filter inlet, and bypass valve. Any other suggestions would be very helpful. I was hoping to see 7-8psi with this smaller pulley.
Thread Starter
Burning Brakes
Joined: Jun 2009
Posts: 1,065
Likes: 7
From: Madison, MS
I have read that people take off the air filter inlet and run it to see if there is a restriction in that. Also I saw that people plug the bypass valve and run it without it and see if that is the issue. My question is if I plug the bypass valve, is that bad to have all the boost on the tb at all times, when my car wasn't tuned with that??
Le Mans Master
Joined: Jan 2009
Posts: 7,767
Likes: 19
From: East Texas
I have read that people take off the air filter inlet and run it to see if there is a restriction in that. Also I saw that people plug the bypass valve and run it without it and see if that is the issue. My question is if I plug the bypass valve, is that bad to have all the boost on the tb at all times, when my car wasn't tuned with that??
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Thread Starter
Burning Brakes
Joined: Jun 2009
Posts: 1,065
Likes: 7
From: Madison, MS
anks for the suggestions guy. Think I found the issue. My bottom bracket bolt was loose, causing some belt slip I believe. Haven't driven it yet to confirm. I checked the bypass valve and by revving it up, the valve seals at 0 on the boost gauge.
Team Owner
Joined: May 2006
Posts: 21,473
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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Can we have some pictures of your set-up?
Your bracket? Tensioners? Air filter? etc?
It is more than likely a belt slipping issue, you won't hear it slipping either.
Thanks,Matt
Your bracket? Tensioners? Air filter? etc?
It is more than likely a belt slipping issue, you won't hear it slipping either.
Thanks,Matt
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
