s/c bov??

[Lloyd]

Pollution? Its nothing but compressed air.

I think VIC is the "police state" over there, others aren't quite as bad from what I've heard

[Shady_Dan]

Pollution? Its nothing but compressed air.

u try telling an aussie cop that while he hands u a defect notice....you know and i know its all bullshit, but u know what the 5-0 is like, doesnt matter what country your in, theyre just revenue gatherers out to look for any excuse to put funny stickers on your car

[Dr-X]

No, they're wanky because on 99% of applications they're pure rice. So morons like you can cruise through town in 1st and go 'listen to maah phat blow off valve, braaaah, it's turbo braaaah'.

My GT4 must be the 1% where it ins't wanky then as it was not only factory fitted by Toyota, but doesn't go 'listen to maah phat blow off valve, braaaah, it's turbo braaaah'. But then again so is the one in my Rover..... and come to think of doesn't a Scoobie, Mitsi, some Nissans etc have them as factory? Bet they add up to more than 1% proving, once again that you must be wrong
Gary

The factory release valve is not called a blow off valve. Dont believe me? Ask Revhead, and he can look up 'blow off valve' on his system, and I'm guessing he comes up with nothing. Of course a release valve is a good idea, but in 99% of cases, the factory valve works fine. And even in those cases where it doesnt, it makes A LOT more sense to recirc the air back, preventing rich running problems (I think?? not sure on this) but more importantly, not making the retarded pppsssssssssssssshhh sound.

Answer me this, guys - if a BOV isn't wanky, why does someone want to put it on their GTZ?

[deaf_rattle]

well dr-x my factory "realease valve" makes more noise than some after market bovs.

so i think that $&#$% up that story.

genuine toyota bov on a 7mgte

[JT]

The factory release valve is not called a blow off valve. The factory release valve is not called a blow off valve. Dont believe me? Ask Revhead, and he can look up 'blow off valve' on his system, and I'm guessing he comes up with nothing.

Since when did God give you the right to be the car part namer? It does the same job, by the same principle. Arguing the name of it just shows how arragant you are

But my lexus isn't a toyota! The name is different!

Yes, you do alot of guessing.

Answer me this, guys - if a BOV isn't wanky, why does someone want to put it on their GTZ?

He didn't know if it would be of use on a s/c so he asks a question. He got a few helpful respsones telling him a bov does nothing for a s/c. Then you come in here and starting ranting on about turbos... Who cares if just wanted the sound. You need a bov, vent some excess air somewhere else than here.

[Dr-X]

OK...would it make you guys happier if I go back and replace the word 'BOV' in all most posts with the term "aftermarket BOV?" Well $&#$% off coz I'm not gonna. I thought you'd have enough intelligence to work that one out, but I guess not

[deaf_rattle]

that still doesnt explain why my factory valve is noisy, when you said it shouldnt be

[Dr-X]

that still doesnt explain why my factory valve is noisy, when you said it shouldnt be

Well, you're obviously the exception, because I've personally never heard a factory valve as loud as loud as all the boy racers around town.

[flygt4]

DR. X my standard vr4 valve is just as loud as any aftermarket item too..does this mean im another exception? it is plumbed back into the intake...you will still hear it because trhe air has to come out somewhere ,and the filter is where. you couldnt tell the difference between it and an aftermarket item

[CozmoNz]

The factory release valve is not called a blow off valve. Dont believe me? Ask Revhead, and he can look up 'blow off valve' on his system, and I'm guessing he comes up with nothing. Of course a release valve is a good idea, but in 99% of cases, the factory valve works fine. And even in those cases where it doesnt, it makes A LOT more sense to recirc the air back, preventing rich running problems (I think?? not sure on this)

Running rich only occur's in Air Flow meter'ed car's

where the PISSHHHH noise releases the boost when the engine's ecu belives it will receive that air. and injects the approperate fueling.

with a map sensor'ed car, the ecu will only inject what the engine *thinks* (due to mapping etc) it will need fuel wise... i think thats right, so @ x of vac, it injects x of fuel.

losing that air / boost, results in higher vac / lower boost whatever, so less fuel is required, since less pressure exists.


thus, wankie bov's on afm'ed cars = silly and cause engine to hate you

wankie bov's on map sens0rz0red cars = the shiz wizza gizza

[Dragger_Dan]

It's amazing to listen to the amount of excessive noise people make with BOV's and screamer pipes. The thing I don't get, is why do you sometimes hear a BOV on a full throttle gear change... isn't that counter productive? Shouldn't a well tuned setup mantain boost pressure at WOT changes to keep as much power as possible?

Second point, why so much wastegate noise? I'm not an expert on turbos, but I thought a wastegate was for controlling the pressure (or flow) on the turbine/exhaust side of the turbo? If this is the case, then shouldn't the wastegate be closed when the turbo is spooling up, then only open to control the turbine speed once desired boost level is reached? If that is the case, then why can so much noise be heard from some cars even from low revs? I could be wrong, so somebody please explain to me.

Anybody?

[1598cc]

It's amazing to listen to the amount of excessive noise people make with BOV's and screamer pipes. The thing I don't get, is why do you sometimes hear a BOV on a full throttle gear change... isn't that counter productive? Shouldn't a well tuned setup mantain boost pressure at WOT changes to keep as much power as possible?

Second point, why so much wastegate noise? I'm not an expert on turbos, but I thought a wastegate was for controlling the pressure (or flow) on the turbine/exhaust side of the turbo? If this is the case, then shouldn't the wastegate be closed when the turbo is spooling up, then only open to control the turbine speed once desired boost level is reached? If that is the case, then why can so much noise be heard from some cars even from low revs? I could be wrong, so somebody please explain to me.

Anybody?

Probly have no exhaust. Wastegates are only noisy when vented to atmopshere, eg exhaust peipe is literally 30cm's long.

You hear the bov on a shift because the throttle is closed, which makes only one exit for all the pressure still in there.. out the bov

[Lloyd]

You'll hear the BOV during changes at WOT because generally you take your foot off throttle briefly when the clutch goes in so you have time with the throttle closed so the engine ins't astually wanting any large volume of air. The BOV opens to allow somewhere for the compressed air in the intake before the throttle to go rather than trying to go back out the intake past the turbo compressor which would basically try to stall the turbo from spinning at 100,000rpm to going backwards, a huge stress on the shaft. With the BOV open (throttle closed) the turbo is still actually spinning which means when you open the throttle again the turbo will already be spinning and you'll have boost sooner than you would otherwise.

As for the wastegate... muppets with exhaust leaks? Couldn't tell you sorry, all the cars with externals I've heard start to scream higher up in the revs

[vvega]

maniford pressure changes on engine load
bov work off this value and can be triggered buy the drop or buy the overboost that occured when you flatchange

as for wastegates its called gain
basically if it takes a bit to slow the aceleration of the turbo compressor
so in the real world you pressure is reached and then excceded by the time the acuator has even thought about opening

this is why they progressively open and should be fully open by the time said boost pressure is reached

hope this helps

ps dr-x is a crack head

[jury_nz]

It's amazing to listen to the amount of excessive noise people make with BOV's and screamer pipes. The thing I don't get, is why do you sometimes hear a BOV on a full throttle gear change... isn't that counter productive? Shouldn't a well tuned setup mantain boost pressure at WOT changes to keep as much power as possible?

Second point, why so much wastegate noise? I'm not an expert on turbos, but I thought a wastegate was for controlling the pressure (or flow) on the turbine/exhaust side of the turbo? If this is the case, then shouldn't the wastegate be closed when the turbo is spooling up, then only open to control the turbine speed once desired boost level is reached? If that is the case, then why can so much noise be heard from some cars even from low revs? I could be wrong, so somebody please explain to me.

Umm hok well ill do my best dude...

I cant say ive actually ever heard a BOV go off at a full throttle gear change, bnut the idea of them is to prevent the compressed air from hitting the throttle butterfly thus sending it back down you intake piping back into your turbo...called compressor surge, sure it would be great to keep the entire system full of compressed air even when throttle is dis-engaged but with no where else for the air to go it can onli go back the way it came.
As for the wastegate this its a little out of my league but basically is your running an wastegate without an electronic boost controller it is quite likely that the wastegate could begin to open as early as 4-5 psi allowed some xhaust gases to bypass the the turbine wheel even if the turbo is still spooling up.
I Think I've got this right, if not I'm sure someone will correct me

[jury_nz]

It's amazing to listen to the amount of excessive noise people make with BOV's and screamer pipes. The thing I don't get, is why do you sometimes hear a BOV on a full throttle gear change... isn't that counter productive? Shouldn't a well tuned setup mantain boost pressure at WOT changes to keep as much power as possible?

Second point, why so much wastegate noise? I'm not an expert on turbos, but I thought a wastegate was for controlling the pressure (or flow) on the turbine/exhaust side of the turbo? If this is the case, then shouldn't the wastegate be closed when the turbo is spooling up, then only open to control the turbine speed once desired boost level is reached? If that is the case, then why can so much noise be heard from some cars even from low revs? I could be wrong, so somebody please explain to me.

Umm hok well ill do my best dude...

I cant say ive actually ever heard a BOV go off at a full throttle gear change, bnut the idea of them is to prevent the compressed air from hitting the throttle butterfly thus sending it back down you intake piping back into your turbo...called compressor surge, sure it would be great to keep the entire system full of compressed air even when throttle is dis-engaged but with no where else for the air to go it can onli go back the way it came.
As for the wastegate this its a little out of my league but basically is your running an wastegate without an electronic boost controller it is quite likely that the wastegate could begin to open as early as 4-5 psi allowed some xhaust gases to bypass the the turbine wheel even if the turbo is still spooling up.

[Dragger_Dan]

... generally you take your foot off throttle briefly when the clutch goes in ...

Ooohhhh, I see now. So that's why the gearbox died in my Mazda

[Shady_Dan]

... generally you take your foot off throttle briefly when the clutch goes in ...

Ooohhhh, I see now. So that's why the gearbox died in my Mazda

dont think thats what wouldve killed a mazda gearbox, just have to look at one of those puppies and they bust

[Santa'sBoostinSleigh]

[quote="CozmoNz]thus, wankie bov's on afm'ed cars = silly and cause engine to hate you

wankie bov's on map sens0rz0red cars = the shiz wizza gizza[/quote]

ok so does this mean if i BOV my GT-T Caldina it will hate me or it will be the shizzel?

[Ash]

DR. X my standard vr4 valve is just as loud as any aftermarket item too..does this mean im another exception? it is plumbed back into the intake...you will still hear it because trhe air has to come out somewhere ,and the filter is where. you couldnt tell the difference between it and an aftermarket item

Oh bullshit. Bullshit bullshit bullshit.