Bypass valve and blow off valves

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bentley429

Banned

Nov 25, 2004

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Connecticut

Aug 26, 2006

#1

• Aug 26, 2006

• #1

Is there a real difference between a bypass valve and a blow off valve besides a BPV recirculating the air to before the supercharger and a BOV just releases pressure into the air. Ive seen many being used just dumping the the pressure into right into the air and also with a hose running back to a point before the supercharger. Can someone explain to me why some people recirculate the air and some dont?

 

RacEoHolic330

I like to dress like a pretty girl

15 Year Member

Mar 4, 2003

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Aug 26, 2006

#2

• Aug 26, 2006

• #2

There is no difference between a bypass valve and a blow off valve, it's just how they are used as you said above. You can use a "blow off valve" and recirculate the air back into the inlet tube and vica versa. People that have blow-through MAF's mounted before the throttle body and after the supercharger normally use blow off valves and vent them to the atmosphere. On the other hand, most people run standard draw-though MAF's mounted before the supercharger. That requires the air to be recirculated into the inlet tube to avoid losing metered air which can cause a rich condition between shifts and whle downshifting.

 

B

bentley429

Banned

Nov 25, 2004

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Aug 26, 2006

#3

• Aug 26, 2006

• #3

Thats basicly what I thought, I remembered talking to you on AIM about it but I wanted to be 100% sure before going out and buying one or the other. But it looks like either or should be fine. One more thing, a by pass valve makes the same noise as a bov if its not recirculated right?

 

GearHd6

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Jul 19, 2005

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Aug 26, 2006

#4

• Aug 26, 2006

• #4

Oh boy, another guy more concerned about the sound than the performance. Sheesh.

 

B

bentley429

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Nov 25, 2004

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Aug 26, 2006

#5

• Aug 26, 2006

• #5

GearHd6 said:

Oh boy, another guy more concerned about the sound than the performance. Sheesh.

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WTF! OMMMMMMMFG! Everyone ignore this but GearHd6.

 

RyanSG

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Oct 24, 2002

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Aug 26, 2006

#6

• Aug 26, 2006

• #6

bentley429 said:

Thats basicly what I thought, I remembered talking to you on AIM about it but I wanted to be 100% sure before going out and buying one or the other. But it looks like either or should be fine. One more thing, a by pass valve makes the same noise as a bov if its not recirculated right?

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depends each type and make has it's own sound... some BOV's you can get recirc kits for them, although i'm not sure if they sound the same or not with the recirc kit....

 

B

bentley429

Banned

Nov 25, 2004

528

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Connecticut

Aug 26, 2006

#7

• Aug 26, 2006

• #7

RyanSG said:

depends each type and make has it's own sound... some BOV's you can get recirc kits for them, although i'm not sure if they sound the same or not with the recirc kit....

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I think the Vortech Mondo is actually a BOV isnt it? People recirculate those sometimes also.