Boost Question
Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
Boost Question
I have a 98 A4 with Andy's PS1 charger setup. It is running 6 lbs of boost with the 4.10 pulley. I just installed a new 3.6 pulley over the weekend, but I am only seeing 7 lbs of boost???????? 
Any ideas as to what could be happening to the pressure. I was expecting to get close to 10 or 11 lbs of boost.
TIA
Dave
Any ideas as to what could be happening to the pressure. I was expecting to get close to 10 or 11 lbs of boost.
TIA
Dave
Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
Belt is tight
I put on a new Gates, 6 rib belt. It is very tight. In fact, it was a b***h to put on. It is at the tuner this week for a new high pressure oil pump, and a retune. The last tune with 6 lbs only gave me 440 RWHP. The engine is forged, so I am not worried about too much boost, just curious as to where the heck it is going.
Safety Car
Joined: May 2002
Posts: 3,615
Likes: 2
From: waterloo ontario
St. Jude Donor '08
When you say tight-was tight to the point that you had to remove the alternater pulley and loosen the alternater bolts so alternater moved inward? the only way to fit a tight belt is this way-oh and the blower bracket has to be loose as well.
Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
Absolutely, the alternator was pushed all the way forward and the SC brackets were loosened up so that I could get some lean out of that assembly. We just barely got the belt over the alternator with a screwdriver, and then when we tightened up the SC bracket and the alternator, all of the give came out of the belt. That sucker doesn't move.
I hooked up all the plumbing according to Andy's instructions. Hopefully, there is just something loose somewhere.
I hooked up all the plumbing according to Andy's instructions. Hopefully, there is just something loose somewhere.
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Thread Starter
Instructor
Joined: Oct 2004
Posts: 134
Likes: 0
From: Arlington Texas
Belt is fine
What I'm thinking is that the BOV that Andy supplies with his kits may have been limited to 7 lbs. The car used to go fairly uick to 5 lbs and then end up at 6 lbs at WOT. Now when you hit the throttle, the boost jumps to 7 lbs and then stays right there. I guess I need to call Andy and check.
Melting Slicks
Joined: Dec 2002
Posts: 2,480
Likes: 62
From: Middletown DE
is the line going to the boost gauge kinked? maybe it is only allowing x amount of air through (recently had this problem but on the vaccum side, line was kinked and only showing 10hg of vaccum)
I believe Quick tested running no BOV before (or wide open), and he only lost 1lb overall with the BOV wide open the whole time - and the BOV wouldnt restrict your boost (that is what a wastegate is for).
I believe Quick tested running no BOV before (or wide open), and he only lost 1lb overall with the BOV wide open the whole time - and the BOV wouldnt restrict your boost (that is what a wastegate is for).
Last edited by SmoothFRC; Nov 27, 2006 at 05:50 PM.
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
I had a problem with the Vortech valve that came with my A&A kit. Here are the pictures. The O ring came unseated and I was loosing a little boost. Your O ring might be stopping the valve from closing al the way. I reseated mine and have no problems now. The O ring goes in the groove in the last pic.
