bypass valve and blow off valve difference

xXJayManZXx17 · March 3rd, 2010, 07:23 PM

whats the difference between a bypass valve and a blow off valve?? looking at a kit with a bypass valve and was wondering what the difference was between the two its a intercooled kit.. i thought you needed a blowoff valve for those

00mustang00 · March 3rd, 2010, 07:35 PM

To be honest I think that they are the same thing. I bought a new procharger kit and it came with a bypass valve. Don't quote me on that though

BOOSTED96 · March 3rd, 2010, 07:38 PM

They are different..there is a write up on here explaining the difference and I am trying to find it now. You can use either or but if you arent going above 12lbs there really is no need for a blow off valve or in other words race valve

mell0 · March 3rd, 2010, 07:39 PM

yes. a bypass valve bypasses air back to the intake track, where as a blow off valve blows it off into the atmosphere. if you run a bypass valve open, that is not recirculating, then it essentially functions as a blow off valve.

00mustang00 · March 3rd, 2010, 07:46 PM

Oh cool thanks for correcting me I had no idea lol

xXJayManZXx17 · March 3rd, 2010, 08:05 PM

that would be awesome if you could find that writeup ... honestly i love the sound of a blowoff valve never heard the bypass valve ill have to check youtube ... also with a bypass valve run open and a blowoff valve you have to have a blow-thru setup correct?

UnixHH · March 3rd, 2010, 08:47 PM

it will depend on where the maf is located.. if its a draw through maf and your purging air back into the intake before the maf your shits gona go all wacky (maf backwash kinda)

xXJayManZXx17 · March 3rd, 2010, 09:23 PM

alright so im just gonna get the bypass valve that it comes with and run it open... which type of MAF should i run blow thru or draw thru? does it really matter?

RyanGT · March 3rd, 2010, 09:24 PM

Blow through is better with tuning. Will have better drivability.

xXJayManZXx17 · March 3rd, 2010, 09:29 PM

Originally Posted by RyanGT

Blow through is better with tuning. Will have better drivability.

thanks man thats what i have been leaning towards i have another vehicle but in the summer im sure ill be driving it a lot so better drivabilitly is always good

RyanGT · March 3rd, 2010, 09:35 PM

Welcome! No point in not doing it hehe. MAF's are about same price, unless you cheap out and go LMAF. Even if you don't DD the car, might as well get the most out of it!

xXJayManZXx17 · March 3rd, 2010, 09:39 PM

Originally Posted by RyanGT

Welcome! No point in not doing it hehe. MAF's are about same price, unless you cheap out and go LMAF. Even if you don't DD the car, might as well get the most out of it!

hahaha yea i hear im looking at the PMAS blow through MAF right now any other suggestions

mell0 · March 3rd, 2010, 09:44 PM

im running a PMAS blow through maf and am completely satisfied with it.

00mustang00 · March 3rd, 2010, 09:55 PM

not to thread jack or anything i was just curious i bought a lightning maf sensor. will that work with the procharger p1sc kit i bought?

Eagle2000GT · March 3rd, 2010, 10:17 PM

Originally Posted by xXJayManZXx17

alright so im just gonna get the bypass valve that it comes with and run it open... which type of MAF should i run blow thru or draw thru? does it really matter?

I'm venting my ProCharger by-pass valve to atmosphere so technically it has become a blow-off valve. You have to have a blow through MAF and the blow-off valve has to be before the MAF. Typically its between the supercharger and the intercooler and the MAF is after the intercooler. I'm running a stock MAF with a Diablosport MAFia. Lightning MAFs can be used with a ProCharger. They just have to be tuned correctly to use them.

00mustang00 · March 3rd, 2010, 10:25 PM

will the car still run with the lightning mafs? because i need to drive it an hour to the tuner.

mell0 · March 3rd, 2010, 10:53 PM

Originally Posted by 00mustang00

will the car still run with the lightning mafs? because i need to drive it an hour to the tuner.

yep it should still run. as long as it's properly calibrated for the injectors. the procharger kit comes with a stock/lightning style MAF adapter so it should be pretty straight forward.

xXJayManZXx17 · March 4th, 2010, 06:54 AM

Originally Posted by Eagle2000GT

I'm venting my ProCharger by-pass valve to atmosphere so technically it has become a blow-off valve. You have to have a blow through MAF and the blow-off valve has to be before the MAF. Typically its between the supercharger and the intercooler and the MAF is after the intercooler. I'm running a stock MAF with a Diablosport MAFia. Lightning MAFs can be used with a ProCharger. They just have to be tuned correctly to use them.

awesome sounds good to me pretty straight forward i was planning on getting the PMAS blow through MAF

Trick Tuners · March 4th, 2010, 11:55 AM

You can make a BPV into a BOV, but you can't (usually) make a BOV into a BPV. BPV is for a draw thru setup, BOV is for a blow thru setup. BOV with the HPX maf or 05+ slot maf / mafia work well.

Scott2001GT · March 4th, 2010, 12:07 PM

Blow-Thru vs Draw-Thru MAF Setups

I think a Big Red Race valve can be a BPV or BOV...that one that is made for draw thru.

March 3rd, 2010, 07:35 PM	#2
00mustang00 Hardcore Enthusiast 2011 Caddy cts, 09 Jag XJ Join Date: Apr 2008 Location: New Hope, PA Posts: 2,337 iTrader: 0 reviews	To be honest I think that they are the same thing. I bought a new procharger kit and it came with a bypass valve. Don't quote me on that though __________________ 2000 GT- Gone but not forgotten

March 3rd, 2010, 07:38 PM	#3
BOOSTED96 Regular 1996 STEEDA Join Date: Mar 2009 Location: Va Beach, Va Posts: 219 iTrader: 0 reviews	They are different..there is a write up on here explaining the difference and I am trying to find it now. You can use either or but if you arent going above 12lbs there really is no need for a blow off valve or in other words race valve __________________ Highly Intelligent Modular Young Gun! Get off my D1 SON!!

March 3rd, 2010, 07:39 PM	#4
mell0 Hardcore Enthusiast 2002 Procharged GT, STR 12.503 @ 113.08 Join Date: Feb 2010 Location: Boxford, MA Posts: 1,873 iTrader: 0 reviews	yes. a bypass valve bypasses air back to the intake track, where as a blow off valve blows it off into the atmosphere. if you run a bypass valve open, that is not recirculating, then it essentially functions as a blow off valve. __________________ 2002 Procharged GT 12.503 @ 113.08 351rwhp 353rwtq Car Videos: http://www.youtube.com/user/mell00ut5?feature=mhee

March 3rd, 2010, 07:46 PM	#5
00mustang00 Hardcore Enthusiast 2011 Caddy cts, 09 Jag XJ Join Date: Apr 2008 Location: New Hope, PA Posts: 2,337 iTrader: 0 reviews	Oh cool thanks for correcting me I had no idea lol __________________ 2000 GT- Gone but not forgotten

March 3rd, 2010, 08:47 PM	#7
UnixHH MM Fanatic 2003 Saleen S281 Join Date: Nov 2008 Location: Houston, Tx Posts: 4,274 iTrader: 0 reviews	it will depend on where the maf is located.. if its a draw through maf and your purging air back into the intake before the maf your shits gona go all wacky (maf backwash kinda) __________________ 480RWHP 450RWTQ 15psi @ 15* on 91 octane

March 3rd, 2010, 09:24 PM	#9
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	Blow through is better with tuning. Will have better drivability. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

March 3rd, 2010, 09:35 PM	#11
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	Welcome! No point in not doing it hehe. MAF's are about same price, unless you cheap out and go LMAF. Even if you don't DD the car, might as well get the most out of it! __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

March 3rd, 2010, 09:44 PM	#13
mell0 Hardcore Enthusiast 2002 Procharged GT, STR 12.503 @ 113.08 Join Date: Feb 2010 Location: Boxford, MA Posts: 1,873 iTrader: 0 reviews	im running a PMAS blow through maf and am completely satisfied with it. __________________ 2002 Procharged GT 12.503 @ 113.08 351rwhp 353rwtq Car Videos: http://www.youtube.com/user/mell00ut5?feature=mhee

March 3rd, 2010, 09:55 PM	#14
00mustang00 Hardcore Enthusiast 2011 Caddy cts, 09 Jag XJ Join Date: Apr 2008 Location: New Hope, PA Posts: 2,337 iTrader: 0 reviews	not to thread jack or anything i was just curious i bought a lightning maf sensor. will that work with the procharger p1sc kit i bought? __________________ 2000 GT- Gone but not forgotten

March 3rd, 2010, 10:25 PM	#16
00mustang00 Hardcore Enthusiast 2011 Caddy cts, 09 Jag XJ Join Date: Apr 2008 Location: New Hope, PA Posts: 2,337 iTrader: 0 reviews	will the car still run with the lightning mafs? because i need to drive it an hour to the tuner. __________________ 2000 GT- Gone but not forgotten

March 4th, 2010, 11:55 AM	#19
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	You can make a BPV into a BOV, but you can't (usually) make a BOV into a BPV. BPV is for a draw thru setup, BOV is for a blow thru setup. BOV with the HPX maf or 05+ slot maf / mafia work well. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

March 4th, 2010, 12:07 PM	#20
Scott2001GT BYAHHHH! 2001 Mustang GT 13.874 Join Date: Mar 2008 Location: Missouri Posts: 14,793 Blog Entries: 1 iTrader: 3 reviews	Blow-Thru vs Draw-Thru MAF Setups I think a Big Red Race valve can be a BPV or BOV...that one that is made for draw thru. __________________ Precision Turbo\|TurboSmart\|TeamZ\|Strange\|Hellion\|BBK\|SCT\|Edge Converters\|Fairbanks\|CG Fabrications\|Treadstone

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