Bov...?

[97TunedMustang]

Well since i cant post anywhere else hopefully i can get an answer here. This has got me stumped. ive seen BOVs like this http://www.optionimports.com/grtybloffvau1.html. that sit on the intake. but there are ones like this http://www.optionimports.com/grtybloffvak1.html that i have seen with the outlet on the side hooked up to a hose and then not. is this BOV capable of being used a dump valve and a compressor bypass valve in the case of hooking up a hose to the outlet and routing it back to the turbine?

And i would have to assume you dont get the Vrmmm PShhhh sound if the hose is connected to the outlet on the side, and if its not hooked up then the sound escapes through the same hole. im just guessing here... ### help.

 

[GUY]

Those blow off valve are the same excpet one is capabale of holding more pressure than the other. now they can both be hooked up to a hose and plumed back into your intake. this makes it so your car wont bog, die, backfire all that stuff....cause its quite rich when you realse that pressure. now on our cars, your usually dont want to vent it to the atmosphere ( not plumbed to intake) dump valve, compressor bypass vavle, blow off valve, pop off valve.........all the same thing. and no it is not loud when you plumb the pressure back in your intake.

 

[MrBoxx]

You're talking about recirculating the blow-off valve. It's a good thing to do, unless you have a MAF translator to vent the blow-off valve to the atmosphere properly.

Even with the recirculation, just about any blow-off valve for our cars will make some noise.

The BOV sits on the intercooler pipe, not the intake. It routes the blown off charge back into the intake which goes to the compressor, not the turbine.

 

[97TunedMustang]

So do you think on a supercharged system theres anyway you could get a BOV to function in place of a BPV and vent the air , rather then recirculate the air back into the s/c?

 

[1993eclipseGS]

That bottom picture is the ebay knock off blow off valve which can be had for 20$ brand new on ebay.

 

[Iceman90]

i don't think you could without having the same problems as you would with a turbocharged system. when you vent your bov to the atmosphere you are losing air that your MAS has already accounted for. so your a/f ratio gets screwed up which causes you engine to bog and die. why would you want a bov noise on a supercharger anyways?

 

[97TunedMustang]

I think it might sound kinda cool actually. why would the maf sensor get pissed tho. your not losing any air until after you let off the gas anyway. the bov stays closed until that point. and recloses again once you get on the accelerator...i must be missing something simple.

 

[1993eclipseGS]

Everytime you let off the gas, The motor thinks that air is going back into the engine, So it is dumping the amount of fuel to get the correct air to fuel ratio. With the bov vented, You are actually getting the fuel to the motor, But the air is going to the atmosphere, Causing the car to run rich.

 

[MrBoxx]

In actuality, our valves are by-pass valves; we just call them blow-off valves. They do more or less the same thing. And 1993eclipseGS is right, when you vent them in a metered air system, the car will tend to run rich between shifts.

 

[fsu99gsx]

On a stock set up the air gets calculated right after the filter on the inake pipe. That is the maf. The thing with wires hooked up to it on the intake pipe. The bov is after this on the intercooler pipe, so the air has already been accounted for, so venting it to the atmosphere causes there to be to much gas and not enough air (rich) when the bov lets air out. That is why it is suppose to be routed back into the intake behind the maf. If you had a blowthrough set up it moves the maf after the bov , so if you vent to atmosphere it is ok cause the air hasn't been calculated yet.