blow off valve?
06-04-2006, 02:14 PM
#2
I ♥ Acer
Join Date: Jan 2006
Location: Orange County, California
Posts: 746
RE: blow off valve?
A blow-off valve is mounted in the intake plumbing between the
turbocharger compressor and the throttle plate. The blow-off valve is a
second safety measure against the turbocharger over-boosting and damaging
the engine.
The blow-off valve is more commonly used to keep the turbocharger spinning
when the throttle plate is suddenly closed. When the turbocharger is
generating maximum boost pressure at full throttle and then the throttle
is suddenly closed, compressed air coming from the compressor slams
against the throttle, generating extremely high pressures that travel
backwards to the compressor stopping the compressor from spinning. When
the throttle plate is again opened, the engine must spool the turbocharger
shaft again. The effects of this high pressure can also be very damaging
to the turbocharger.
turbocharger compressor and the throttle plate. The blow-off valve is a
second safety measure against the turbocharger over-boosting and damaging
the engine.
The blow-off valve is more commonly used to keep the turbocharger spinning
when the throttle plate is suddenly closed. When the turbocharger is
generating maximum boost pressure at full throttle and then the throttle
is suddenly closed, compressed air coming from the compressor slams
against the throttle, generating extremely high pressures that travel
backwards to the compressor stopping the compressor from spinning. When
the throttle plate is again opened, the engine must spool the turbocharger
shaft again. The effects of this high pressure can also be very damaging
to the turbocharger.
06-04-2006, 10:44 PM
#4
2nd Gear Member
Join Date: Nov 2005
Location:
Posts: 489
RE: blow off valve?
Damn...that's what I was going to say on my own...
A recirc valve routes the pressured air back into the intake track to aid in spooling up the turbo after shifting. A "blow off" valve vents the pressurized air into the atmosphere, and depending on the horn, it makes a nice sound. Most cars with air flow meters need that vented air since the computer has already calculated for it. Thats why without proper tuning most cars run like crap with a blow off, unless they are using a MAP sensor for their reference instead of a MAF, etc.
A recirc valve routes the pressured air back into the intake track to aid in spooling up the turbo after shifting. A "blow off" valve vents the pressurized air into the atmosphere, and depending on the horn, it makes a nice sound. Most cars with air flow meters need that vented air since the computer has already calculated for it. Thats why without proper tuning most cars run like crap with a blow off, unless they are using a MAP sensor for their reference instead of a MAF, etc.
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