Air by pass valve question.

[91LX2Bfast]

Originally posted by ArtMan
... The blow off valve on a turbo releases excess boost when it reaches a predetermined max.

You're thinking of a wastegate.

A blow off valve and a bypass valve (or divertor valve) are basically the same thing. Used on MAF equiped cars, the bypass and divertor valves recirculate the air back into the intake track before the compressor but after the MAF. Where as a BOV just releases it to the atmosphere.

[ArtMan]

OK, thanks. When he said blow off valve, I thought he meant wastegate.

You can install a bypass valve on a s/c and leave the end open to the atmosphere. And you definetly will get a noise - some say a farting noise.

[Jaegermeister2k]

Originally posted by ArtMan
OK, thanks. When he said blow off valve, I thought he meant wastegate.

You can install a bypass valve on a s/c and leave the end open to the atmosphere. And you definetly will get a noise - some say a farting noise.

But that's the problem.If you do that some superchargers have problems idling.I've talked to several people claiming that.

[91LX2Bfast]

Yup. With a pull through MAF (oem type,) you want to recirculate the air. The bypass/divertor valves still make that "cool" whoosh sound, just not as loud as the bov.
With a blow through MAF, you can install a BOV and vent to the atmosphere.

[USMC302]

ok, let me ask the obvious. Pro-M will only be able to recalibrate Pro-M meters right? Does C&L have this option, anyone know?

[jonnyk]

Yes you must send it to Pro-M for a recal. You would have to check but I don't think C&L has a calibration for blow-through (you just change sample tubes on them when you want to change the calibration).

[Blackstare]

I know that this is a very old thread... But... It can be done? Put a blowoff vavle instead of the bypass valve???