Blow off? - Toyota Nation Forum : Toyota Car and Truck Forums

TRDemon · 01-30-2006, 02:05 PM

Question guys, A friend of mine told me he has a blow off valve installed in his car and the thing is he told me its blow off with out a turbo or supercharger do you think that an N/A engine can can create enough pressure the can make a blow off valve open.is this realy possible

Flashmn · 01-30-2006, 02:58 PM

Nope, because theres no pressure inside the intake tubing in a N/A car, since theres nothing to create pressure, thats what a turbo / sc does.
Blow off valve is there to prevent turbine stalling, which damages the bearings of a turbo.
Your friend either is bullshitting or just plain stupid.

TRDemon · 01-30-2006, 03:10 PM

thanks bro

canadianae92 · 01-30-2006, 05:19 PM

Blow off is also useless on a s/c, am I wrong?

VooDoo · 01-30-2006, 05:48 PM

Quote:

Originally Posted by canadianae92

Blow off is also useless on a s/c, am I wrong?

depends. the stock 4AGZE has the charger after the throttle body so theres no use to add a bov. some after market scs put the charger before so a bov could be of some use.

punter · 01-30-2006, 07:01 PM

Quote:

Originally Posted by VooDoo

depends. the stock 4AGZE has the charger after the throttle body so theres no use to add a bov. some after market scs put the charger before so a bov could be of some use.

You mean like this

ProjectCorolla · 01-30-2006, 11:11 PM

does he have something like this?
http://www.sunamiturbo.com/

its a turbo simulator lol

digital_racer · 01-30-2006, 11:55 PM

Some guys here who have scooters place a speaker in series with their brake lights. Everytime they break, they make a turbo like sound - static turbo lol. You could put one with the timing lights maybe?

bov is used to modulate the drastic change in pressure when letting go of the throttle. some extreme tunings with sc would probably be using that.

***REN69*** · 01-31-2006, 01:42 AM

fake blow off valves.. AHAHAHAHAHAHAHAHAHAHAHAHA!!

digital_racer · 01-31-2006, 01:50 AM

On the plus side - used speakers are a lot cheaper than
http://www.sunamiturbo.com/

Flashmn · 01-31-2006, 06:30 AM

Quote:

bov is used to modulate the drastic change in pressure when letting go of the throttle. some extreme tunings with sc would probably be using that.

Its not used to modulate pressures, but to keep the turbo from stalling like I said previously. Nothing else. You can run a turbo car without a bov, but your turbo wont like it.
SC cars its rather a matter of choice as you dont really need it.

SR5_4WD · 01-31-2006, 12:53 PM

Quote:

Originally Posted by digital_racer

On the plus side - used speakers are a lot cheaper than
http://www.sunamiturbo.com/

Oh shit not that again. But on the plus side there's a car like my dads in the background. But a hot girl didn't come with it

polo708 · 01-31-2006, 02:17 PM

at WOT on a n/a car there is 0 pressure... normal driving and at idle you will be in vaccuum. "Boost" is considered pressure.

digital_racer · 01-31-2006, 06:30 PM

Quote:

Originally Posted by Flashmn

Its not used to modulate pressures, but to keep the turbo from stalling like I said previously. Nothing else. You can run a turbo car without a bov, but your turbo wont like it.
SC cars its rather a matter of choice as you dont really need it.

So a bov makes sure that the pressure between the turbo and the throttle doesn't exceed the point where it would start doing any harm. It's supposed to relieve the system of the drastic increase in pressure when the throttle is suddenly closed while the turbo is spining (taking more air:increasing pressure).

punter · 01-31-2006, 06:39 PM

Quote:

Originally Posted by Flashmn

SC cars its rather a matter of choice as you dont really need it.

Not always, that car in the pic i posted up used to run a smaller BOV on the first time at the track the BOV couldn't vent fast enough, and it blew all the intercooler piping. Hence the massive one on there now.