bov adjustment

[GreddySpyder]

i recently purchased my 97 gs-t spyder and it came with quite a few goodies already on it. my question is about the greddy BOV, it has a screw on the top that is adjustable from soft to hard. does this actually make a difference in boost pressures and horsepower, or does this only change the sound of the BOV?

 

[GreddySpyder]

come on, surely somebody must know???

 

[sleepinGSX]

it putts more or less tension, so when u blow off, its either lets more or less air out, also easier or harder to blow off.

 

[LaserRST]

Adjust it to match your boost, this adjustment prevents boost leak out of your BOV. It is handy when you go over stock boost pressures. For instance the 1g BOV maxes at about 16psi. If you exceed 16psi the BOV will actually be pushed open and give a boost leak that will create lag at reaching your new max boost. This is why people crush the 1g BOV to hold higher boost pressures. If it is too tight, than there may be a problem with the BOV from opening between gears causing damage to you turbo and making it harder to spool back up between gears. Hope this helps.

 

[44pirate]

Keep tightning it till you compressor surge. THen loosen it till the surge goes away. Do this first at normal driving. Then when you go WTO see if your holding at where you set your boost at, that's if you have a Boost guage.If it isn't holding boost then tighten a little till it does.

 

[GreddySpyder]

Forgive me as I don't have much experience with turbo cars, only NA ones. How do i know when i get "compressor surge"?

 

[44pirate]

Compressor surge happens when the BOV doesn't open fast enough and air slams back into the compressor wheel. It sounds like a flock of birds taking off. CHA CHA CHA CHA CHA. You here it when you get off the gas while your in gear. Like say in 3rd 3/4 throttle to 5000rpm and then get off the gas fast, you should just here the BOV go sshhhhhhhh if yo get CHA CHA CHA CHA it's to tight.
Man this sounds really weird but I don't know how to explain it any other way. I hop it helps. Good Luck


George

 

[candela]

hahaha thats really funny pirate! That is an awesome way to explain it cause it really does sound like a bunch of pigeons taking off all at once...hehe Greddyspyder you will know when you have compressor surge. If you need to, then pull your dump tube off and vent so youy can listen for it and set your BOV, then hook it back up when your done. Its not the normal bov whistle or whoosh or w/e, its a fluttering and youll know...

 

[GreddySpyder]

could the adjustment of the BOV have anything to do with the fact that my boost gauge needle never reaches the top line where the + is even at full boost, or is this just to do with the fact that the stock gauge is innacurate?

 

[TurBoGs-T]

Stock gauges are completely useless. You will need an aftermarket Boost Gauge to get accurate readings. But It "could" be the problem if you have the setting too loose, or you might have boost leak coming from another part of the engine.

 

[rubbersidedown]

i assume it causes some sort of damage to your turbo when your compressor surges... if so, how much? if not, then what does it do? would it cause one's boost to spike well over their pre-set boost limit?

-edit-
btw, i'm asking this because my friend has a greddy type-s bov on his tsi awd and his turbo makes that sound ALL the time and i always thought it was kind of odd but i never thought anything of it cause frankly, i had no clue that was a problem. i'm still pretty new to turbos and the dsm scene in general. so this thread has really enlighted me. thanks

 

[candela]

It doesnt really cause instant damage, but it puts a lot of stress on the internals of the turbo. Its trying to spin one way and then all of a sudden, how ever much boost you run, is bounced off of the compressor, it would severly shorten your turbo life. It wouldnt really cause your boost to spike though

 

[TheHater]

Like others already said. Tighten down the greddy until it surge like pirates noise. Then back out the screw slighty.

Personly I dont like the Greddy bov's, they tend to either leak boost or surge when you get them tight enough to hold boost.

HKS SS is the way to go IMO for "street" usage. Tial is the shit but will surge like a MOFO on the street.

Compressor sure WILL shorten the life of your turbo. Compressor surge=bad for turbo.