Blow off Valve question

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07-02-2003, 02:49 PM

TZapper

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Blow off Valve question

Hi all,

Im curious, are Blow Off Valves recommended for Turbocharged cars only, or can they be used with stock engine (w/ an intake mod) too?

Thanks.

07-02-2003, 03:29 PM

trey

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I wish i could use one on my stock engine. i believe just a turbo charged engine.

07-02-2003, 05:41 PM

WildmanAL

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I had a friend you had one on a jetta that just had CAI. I thought it was really stupid since there insn't any forced inducted pressure so BOV are pointless on stock cars.

07-02-2003, 06:14 PM

PCGuRu2K

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On our Max's you only need them on sc'd or turbo'd cars.. It's used to release excess pressure so that it doesn't mess up the blower by backdrafting.

07-02-2003, 07:05 PM

maxGTRvq35de

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did your friends blow off at all?

07-02-2003, 07:45 PM

WildmanAL

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Quote:

Originally posted by maxGTRvq35de
did your friends blow off at all?

Actually it did when he shifted gears since it was a standard. I didn't hear it when we were riding around, but when he backed up and switched gears you could hear is pshhhhh. It was such a small sound it probably couldn't be heard going down the road. BTW he had an Injen.

07-02-2003, 08:44 PM

asu174

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You ******* ricers. Why the **** would you need a blow off valve if you don't have a turbo?

07-02-2003, 08:49 PM

02'maxed-out

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i guess they want to be something they aren't...which would be non-turbo...
why would you want to sound intimidating, but really you're just allmotor..

07-02-2003, 08:54 PM

mjg

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Quote:

Originally posted by wildmanal

Actually it did when he shifted gears since it was a standard. I didn't hear it when we were riding around, but when he backed up and switched gears you could hear is pshhhhh. It was such a small sound it probably couldn't be heard going down the road. BTW he had an Injen.

BTW, i think your friend is lying. All injen's SHH... It doesn't just happen when you change gears, it happens when you just give it a touch of gas, or enough gas so that when its interupted u will notice the sound over the engine noise. Some guy said it on ohere, it sounds like air sucking out of a straw. Real BOVS make like a sneeze sound aCHOO like that. hahaha

07-02-2003, 09:18 PM

#10

maxGTRvq35de

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im not for puting it on a NA car i was just curius to see if it worked

07-02-2003, 10:03 PM

#11

asu174

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This is what you guys are looking for

http://www.takakaira.com/accessories...ightpager.html

07-02-2003, 10:09 PM

#12

WildmanAL

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Quote:

Originally posted by mjg

BTW, i think your friend is lying. All injen's SHH... It doesn't just happen when you change gears, it happens when you just give it a touch of gas, or enough gas so that when its interupted u will notice the sound over the engine noise. Some guy said it on ohere, it sounds like air sucking out of a straw. Real BOVS make like a sneeze sound aCHOO like that. hahaha

No he had a BOV saw it with my own two eyes. Well I think it was an injen. In reality the guy isn't my friend, but I didn't know what to call him. I can't stand the guy, but my other friends like him so be it. And I don't exactly remember when it made the SHH sound. I just remember hearing it when he was backing out of the driveway.

07-03-2003, 12:13 AM

#13

mjg

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does he have like a sticker on the back of the car that says "BOV" charged : P

07-03-2003, 12:25 AM

#14

HitManSE

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Quote:

Originally posted by asu174
You ******* ricers. Why the **** would you need a blow off valve if you don't have a turbo?

07-03-2003, 12:38 AM

#15

2001SE

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Jetta's have turbo engines, the guy could have had a BOV there

07-03-2003, 12:45 AM

#16

HitManSE

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The 1.8T motor usually does NOT have a blowoff valve installed. The car will run rich as hell, go search on www.vwvortex.com for more info on this.

07-03-2003, 12:49 AM

#17

2001SE

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oh yeah, you're right, my bad
you gotta add some PSI, maybe the guy had a chip?

07-03-2003, 05:21 AM

#18

busakiller

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Quote:

Originally posted by asu174
You ******* ricers. Why the **** would you need a blow off valve if you don't have a turbo?

To be Pretty Coooooooooooooooooooooool.....

07-03-2003, 05:22 AM

#19

busakiller

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Quote:

God Bless You.... HAHAHAHAHAHA!!

07-03-2003, 05:51 AM

#20

PCGuRu2K

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If you N/A guys wants to hear the psshht sound on your car then go on ebay and buy that lil fake bov sound maker

07-03-2003, 06:11 AM

#21

busakiller

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Quote:

Originally posted by PCGuRu2K
If you N/A guys wants to hear the psshht sound on your car then go on ebay and buy that lil fake bov sound maker

Shoooooooot... I'll make a .wav file of a psshhhhh sound and play it real loud through the radio.. Betcha I'll get so many looks like damm he's got a turbo dude!!!!

I really need to start thinking of stupid **** like that to sell to idiot's and make a killing...

07-03-2003, 08:03 AM

#22

itdood

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Quote:

Originally posted by maxGTRvq35de
im not for puting it on a NA car i was just curius to see if it worked

I'm not sure for SCed cars, but for a turbo, BOVs are used to help minimize turbo stall during a shift. If you close the throttle to ****, the throttle plate will cause a pressure wave to head back to the turbo and will stall it. The BOV vent the pressure so the turbo can keep up to speed in between shifts.

A BOV works when vacuum hits the top side of the diaphram and there is boost on the bottom side.

I know the BOV on my Talon TSi has a port on the bottom side (intake side) and the boost signal is part of what makes it work.

So in a N/A car, I'm not so sure it would work the same way that it does in a turbo. The BOV may actually open when it's not supposed to or vise versa, making the car run like **** since the vent would be pulling in air that didn't go through the MAF and get counted by the ECU.

Normally, you vent them back to intake behind the MAF since this is counted air. For an N/A car, there would obviously be no venting since there is no boost, but you still might get a woosh sound since there would be high vaccum in the intake when it opens. But that would make the car run like $hit since this would be "un-counted" air making its way into the intake. You could try hooking the vent on the other side of the MAF, but that would muffle the sound a lot.
I'm assuming you already knew there would be absolutely no perfomrance gain, in fact, it would probably hurt performace. People that do this in a N/A car are doing it to pose a turbo.

That all being said, I have to give my humble opinion that someone that tries to sound like something they aren't (i.e. PRETENDS to have a turbo) is completely effing ghey