Blow off valves "mythbusted", also, BOV on a NA car...

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ayabe

Diamond Member
Aug 10, 2005
7,449
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Thanks for the link.

Pretty entertaining, I haven't seen those guys before, going to have to check out some of their other videos.
 
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HarryLui

Golden Member
Aug 31, 2001
1,518
33
91
BOV is to blow off excessive pressure between the intake manifold and the turbo/supercharger.
 
punjabiplaya

punjabiplaya

Diamond Member
Nov 12, 2006
3,495
1
71
nice, lol @ that company's name "Go Fast Bits"

+1 to more fking ricers, ugh
 
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Greenman

Lifer
Oct 15, 1999
21,873
6,248
136
I don't fathom how there could be any myth here. On any forced induction engine there are going to be times that you don't want boost. When that happens there are two options, you either vent the excess pressure, or let the air stall in the intake tract.
On an NA engine, there is never any pressure to vent. A blow off valve will have the same effect as adding a pencil sharpener.
 
GasX

GasX

Lifer
Feb 8, 2001
29,033
6
81
Looks like they showed, despite their premise, that aftermarket blowoff valves do provide a performance enhancement.
 
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ShawnD1

Lifer
May 24, 2003
15,987
2
81
I might be retarded, but I don't think those guys tested what the engineer actually said. He didn't say it gave more power. What he said was that saving some of the pressure rather than venting all of it reduced LAG because you start from maybe 3psi instead of 0. All their numbers showed was peak power, which has absolutely nothing to do with the throttle lag that guy talked about.


Ok I have idea. Instead of using some complicated spin up and down kinda deal, why not have a small tank that stores pressure? Instead of waiting for a turbo to spin up, it would just open the valve and boom instant boost. Boost comes from the tank, and the turbo feeds the tank. It's actually how a battery backup system works in electrical systems....
 
thescreensavers

thescreensavers

Diamond Member
Aug 3, 2005
9,916
2
81
GasX said:
Looks like they showed, despite their premise, that aftermarket blowoff valves do provide a performance enhancement.
Click to expand...

uh where? The stock Blowoff Valve is fine but if you add boost, or tune for boost to hold longer or w/e then you need a bigger valve to handle the pressure.
 
DivideBYZero

DivideBYZero

Lifer
May 18, 2001
24,117
2
0
ShawnD1 said:
I might be retarded, but I don't think those guys tested what the engineer actually said. He didn't say it gave more power. What he said was that saving some of the pressure rather than venting all of it reduced LAG because you start from maybe 3psi instead of 0. All their numbers showed was peak power, which has absolutely nothing to do with the throttle lag that guy talked about.


Ok I have idea. Instead of using some complicated spin up and down kinda deal, why not have a small tank that stores pressure? Instead of waiting for a turbo to spin up, it would just open the valve and boom instant boost. Boost comes from the tank, and the turbo feeds the tank. It's actually how a battery backup system works in electrical systems....
Click to expand...

They did show the plot and pointed out the line for the stock unit. It was clearly leaking boost at higher RPM. The aftermarket units were not.
 
PlasmaBomb

PlasmaBomb

Lifer
Nov 19, 2004
11,636
2
81
DivideBYZero said:
They did show the plot and pointed out the line for the stock unit. It was clearly leaking boost at higher RPM. The aftermarket units were not.
Click to expand...

That doesn't show throttle response though, which is what Shawn was complaining about.

It does however show that "an old valve with leaking valve seals" sucks. That should be common sense.

It also shows that if a factory valve is rated at 10 psi, it will vent any boost you generate above about 10psi by remaping the ECU.
 
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