Do you guys run your BOV on the hot side or the cold side?

[SketchyRollin564]

Hm... makes sense

probably wont be getting a tune for a while.. will this also give me s***ty gas mileage since it thinks there is more air than it really is and in return will give it more fuel?

Also, is it possible to recirculate the air from the cold side, or is that just very impractical?

[AAV240sx]

You can recirculate from the cold pipe just fine. You'll just need a longer hose that goes from the bov on the cold pipe and attaches to the intake pipe behind the maf.

As for your mpg, it's possible? I've no idea, but if you're worried about gas then just baby the throttle and try not to hit boost.

[kouki munster]

Hm... makes sense

probably wont be getting a tune for a while.. will this also give me s***ty gas mileage since it thinks there is more air than it really is and in return will give it more fuel?

Also, is it possible to recirculate the air from the cold side, or is that just very impractical?

It won't effect a thing, (not gas mileage, and not power)the only time that it will dump more fuel than what is needed is when the bov is open and dumping air out of the charge pipes.(changing gears, or pushing in the clutch to come to a stop with enough pressure in the in the intake tract to cause the bov to actuate)

[SketchyRollin564]

alright so basically running and open BOV should be no big deal despite what some people are saying?

if it makes a difference i have a t25 and my intercooler isnt to big (not the massive huge front mounts most people have, but it is a front mount)

[S13Teddy]

Yeah, in theory you're dumping more fuel than you have air for.

Most pro and pro-am competition cars either have no BOV, or have a recirculated BOV.

Plus I think the idea of a BOV that "whistles" into the air is super tacky and "ricer". But that's just me.

[White Comet]

i got as good as 35 mpg on my sr with the bov vented and no tune. idle never dropped at all and the car ran slightly rich but no more then usual.

i dont vent my bov for the cool sound. basically if i dont have to plumb something and run hoses every where i wont

[scotty-2-forty]

You have a four cylinder car that is turbo'd and you're worried about gas mileage? Dude, the only way you'll save gas is to get rid of the turbo! I can't stay out of boost even if I try ... it's always too tempting! Try driving a '65 Skylark everyday with a carburated 455 in it! And to those who think that noisy BOVs are 'ricer' ... hehe ... On my car, it's a battle cry! But that's just me.

[SketchyRollin564]

Well im worried about gas milage as far as the s***ty tune. if i stay out of boost im pretty confident a well running SR gets good gas milage, but heres two reasons why i might be running rich

1. Non recirculated BOV2. Walboro 255lph fuel pump3. Not tuned for either

[E7-S14]

You'll prob run rich.and if your not recircing, you will run rich in parts of your powerband.

i ran mine open atmosphere, got annoyed when it wanted to stall after shifts, and slowing down. blew up before i could recirc.

and your not gonna get KA gas-mileage with the SR>and you'll want to stay in boost.. trust me

[kouki munster]

Well im worried about gas milage as far as the s***ty tune. if i stay out of boost im pretty confident a well running SR gets good gas milage, but heres two reasons why i might be running rich

1. Non recirculated BOV2. Walboro 255lph fuel pump3. Not tuned for either

The only thing that might happen is your stock fpr could take a crap because of the walbro, which will cause your car to run rich.

I'll say it again, the only time that the bov will cause it to run rich is when the bov is relieving pressure in the charge pipes, and it will only do that when you are changing gears, when you push in the clutch to come to a stop with positive pressure in the intake tract, or any time you let off the throttle with with more than 0 psi in the charge pipes.

[SketchyRollin564]

You'll prob run rich.and if your not recircing, you will run rich in parts of your powerband.

i ran mine open atmosphere, got annoyed when it wanted to stall after shifts, and slowing down. blew up before i could recirc.

and your not gonna get KA gas-mileage with the SR>and you'll want to stay in boost.. trust me

You blew your SR from that? Holy s***, thats not what i want to do lol. Wasnt yours a DE that your added a turbo to though? Im guessing (hoping) thats why lol. My motor was rebuilt, i want this to give me as little problems as possible

It doesnt seem very practical to try and recirculate the BOV all the way from the cold side. Should i be fine if i just leave it open? Im only gonna be running somewhere around 7 or 8 pounds of boost till i get a tune. My friend is running his open on the cold side with a T3 and about 350rwhp. Its his daily driver and never gives him any problems. He doesnt have a real tune but he has an apexi safc NEO or whatever its called

Lastly, I don't want my FPR to take a crap, would i need an aftermarket to run the walboro safely? Or should i be fine for the first month or two if i take it easy

[kouki munster]

How long the factory fpr will last depends on what condition its in, it could go out next week or it could last a few years, just run it until it goes then replace with a good aftermarket adjustable unit.

Running a open atmosphere bov is not what popped his motor, I'm not going to speculate on it as I don't know the full details on what happened, but it sure as hell wasn't the bov.

Also tell your friend to get something better to tune his car with, the safc is a crutch at best, and IMHO all it does is f*** up a good wiring harness.

Now, stop being a worry wart and go enjoy your car, you don't need a tune to run a open atmosphere bov or a walbro fuel pump.

[GTR PrYdE]

Hotside.

I figured I should run it on the cold, like my evo's setup, but it was just much much easier to plumb on the hotside, so I went for it.

No problems, no flutter, every now and then the rpms dip real low coming to a stop, I THINK it's from the maf being too close to the turbo inlet. I'll fix that and post results when I do.

I did NOT want to vent, it's less efficient, stalls are way more likely to happen, and I wanted it to be very streetable.

Evo IX Bov FTW, super smooth, and practically guaranteed to hold at least 25psi.