Maxflow Bypass Q's....

[Thekid]

Couple of quick Q's on my Maxflow bypass.

First, I have my s-trim pulleys at 2.75"/8" and am only seeing 7psi of max boost (6000rpm). I'm really thinking I should see at least 12psi out of that pulley combo. This is on a '89 LX.

I think my problem is my Maxflow bypass valve.

1. It has the adjuster nut still set at the factory default, which I believe is all the way out for 3" Hg. Should I adjust this in?

2. I have the vacuum port plumbed into the vacuum block on the firewall. Is that ok?

3. I have the breather port on the bypass completely open right now. Will this cause a boost leak? Can I just plug it or should I run it to the breather which I have capped off right now?

Any help is appreciated.

[speedytang]

I don't see your combo listed but I don't think it is your bypass which you can just unhook and plug and verify that. Just remember how boost/psi is viewed, it is back pressure that your reading so if you have free flowing heads or intake and a cam with additional overlap your boost numbers will be lower than a person who is using for example stock parts. Your 8psi can equal 12psi.

[Thekid]

Speedy....thanks for the reply.

Can you help me on my 1st & 3rd questions though? I want to make sure I have the bypass setup correctly.

[speedytang]

The nut is set on how fast or amount of vacuum you want it to open. Boost keeps it closed and should not leak unless the o-ring is bad. If you venting and not putting it back to the intake pipe you will cause a rich condition between shifts or when the valve opens since it is unmetered air but should not cause a boost leak. I would adjust the valve so it stays closed till you decelerate at maybe 15" so it is not open all the time while driving.

[blown1989saleen]

I dont see the bypass being your problem, dont touch that adjustment.....its fine where it is from the factory. I personally make sure my bypass its own dedicated vacuum source (not T'd into) and no that breather will not cause a leak.....its exactly that a breather. as said what is your combo???? but Id say with a 2.75" compressor pulley your prolly experiencing belt slip, is the belt tight enough? I dont know the calculations off the top of my head but with a 2.75"/8" pulley combo your possibly overspinning the blower but thats another

[Sukkoi19]

At 6000 RPM that blower is spinning 60K RPM. I would say your boost numbers are low unless your running a big block or something very large. Belt slip is the most likely culprit. Although I did have a Mondo partially stick open on me once. I cycled the set screw all the way through its range and that fixed the problem.