• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

m90 bypass valve question

bhrfpa11

bhrfpa11

New member
so i was wondering if its even possible to do a mod to the supercharger and make the bypass valve stuck open so the supercharger is functional at all times. and what the pros and cons would be. one bad thing i know already is decreased mpg...anything else good or bad about doing this? or eevn how to do it?
 


you wouldnt want that. trust me.

you could JB weld the plunger so the valve is closed, but it would cause all kinds of problems. DO NOT DO THIS.
 
well i didnt necessarily meaN open. i meant like whichever way made the supercharger active at even low rpms. just curious...what would happen?
 
Cons:
a bunch more heat
more parasitic loss resulting in the fuel economy loss you mentioned, but also putting more wear on the engine
Possible rougher running engine
More part throttle burst knock

Pros:
?
 


not meaning to thread jack but i recently "fixed" my BBV problem by plugging the lower line and leaving the bbv nipple open to the atmosphere. will this give me trouble?
 
2000GTP said:
not meaning to thread jack but i recently "fixed" my BBV problem by plugging the lower line and leaving the bbv nipple open to the atmosphere. will this give me trouble?
Click to expand...

No, that's totally different. You still have a fully functioning, vacuum operated BBV; the computer just can't interfere with it anymore. We're talking about totally disabling it and blocking the valve shut like some of the Fiero guys do
 
i was just thinking that sine the valve keeps the blower from working at low rpms that if it was disabled then the blower would work at all rpms...
 
bhrfpa11 said:
i was just thinking that sine the valve keeps the blower from working at low rpms that if it was disabled then the blower would work at all rpms...
Click to expand...

It's not about RPM, it's about vacuum levels. At low vacuum (high throttle position), the BBV is closed, so even at low RPM, the blower is pushing air if you push the gas. All this could do is cause more boost at part throttle, but why not just push the throttle more? There's no gains to be had that I know of, and plenty of potential problems.
 


You must log in or register to reply here.
Back
Top