Re: Qs re DYI pressure source (for MBC setting, etc) - Saab Performance Bulletin Board - Saabnet.com
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Re: Qs re DYI pressure source (for MBC setting, etc)
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Posted by Dean (more from Dean) on Fri, 2 Aug 2002 15:36:56 Share Post by Email
In Reply to: Qs re DYI pressure source (for MBC setting, etc), Stealthbomber, Fri, 2 Aug 2002 14:24:34
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Just to pre-set a MBC? Don't bother. Just hook it up and start adjusting. I assume that you gave a boost guage. But how accurate are boost guages?

The MBC's setting will depend on the wastegate actuator to some extent as well.

If you had shop air and a regulator, you could connect the installed MBC and adjust it that way, watching the wastegate move etc. That is how base boost should be set too, connecting directly to the actuator.

I created a test manifold with a fitting to snap onto my shop air. It has a 1" hose barb for my pop-off valve, and on small barb for my boost gauge, which removes very easy from my Saab, and a hose barb to provide pressure to the pressure regulator that controls the pop-off valve. That was interesting to use. But sounds like overkill for a MBC.

(My pop-off valve is really a blowoff valve where the regulator pressurizes the blow-off valves hose barb to allow the pop-off pressure to be regulated with the pressure regulator knob. So I had to see how it worked and test to see if it was going to work at all etc. I did get it roughly dialed in before installation. I might put a softer spring in it which and then dial the pressure ip. This might improve its control and reaction speed etc. A bench test rig was definately good to have in this case. It was also good to use the same guage that I drive with, the same boost guage. That eliminates problems with differences between guages.)

95SET 143000 miles, MBC and frankenstien pop-off valve

posted by 208.24.179...

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