compressor surge

[brandons 95]

I know this is probably dumb but I am trying to learn everything about my car before I go messing around with it so, how can you tell if you have compressor surge and how hard should you set your blow off valve to where it will be set up perfectly

 

[dvbrien]

What I did was start at the lowest setting on the MBC and take it for a run, after 5-10 times of minute adjustments, you should notice your boost leveling off at a certain psi (you have to have an after market Decent boost guage). I am thinking this is the point when pressure is being releases from your piping. Then just set it a little lower than that point. Worked great for me. My stock 1g BOV is holding 18-19 psi, Though I dont think this is normal.
Hope this helps. It is a process not an exact setting.
dvb

 

[JCMDSM]

Without any fuel mods it is unwise to run anything over 15 psi. As far as the tuning itself just take her for a spin and gradually increase the boost until you reach about 15 psi. If you want to go higher than that look into a new turbo and some fuel upgrades.

 

[blcknspo0ln]

if you have no upgraded fuel components, do NOT run over 12 psi. make sure you have a working boost gauge to ensure that you are not boost creeping. this is a very common problem with the 16G turbo family.

anyway, on to the BOV. it is a greddy RS so it should have a soft and hard setting. The easiest way to tune is grab a 3mm allen wrench and a 10mm open end (or wahtever fits the nut). turn it to very loose (NOT all the way out!). then turn the key a good 2 full rotations (720*). start there. This will be very far from the sweet spot on your BOV, but start soft. go for a spin, put it in 2nd and boost to 10 psi and let off. you will hear a WHOOOSH sound. it is too soft. now, go out and loosen the nut and continue to turn the allen key 1/2 turn. repeat the 2nd gear run. you will hear a WHOOSH again. keep repeating this process (by tightening 1/2 turns) until you get in 2nd and blow off. when it is too tight it will compressor surge, it will literally sound like a turkey. CHUCK CHUCK CHUCK CHUCK.. ok, go out and turn the BOV SOFT about 1/4 turn. repeat 2nd gear. if you still hear teh turkey, do another 1/4 turn. then pretty soon it will go back to teh whoosh sound. now go back and tighten it 1/8 turns until you get it perfectly in the middle. it will sound very distinct.

goodluck

 

[ericbev]

I just posted this information on your last requests. Did you go look to see if anybody anwsered them? Anyways Ill repost what I said before to clear anything up that you havent already figured out.

How do I adjust my BOV correctly?

The "harder" the setting (the deeper the adjustment screw. I assume its the same as the type-s), the less prone the valve will be to being blown open and the greater the change in pressure needed to open it. Set too soft, the valve could possibly be blown open under high boost. Set too hard, the valve may flutter or not open at all. Any fluttering from too hard of a setting will be most noticeable during light throttle changes since there is only a small change in pressure on either side of the valve. The more you let off the gas and/or the more quickly you let off, the greater/sharper the change in pressure and the increased ability for the valve to open flutter-free. In short, for the very least potential valve flutter, adjust the spring as light as possible without it being blown open for your setup and boost level. The fluttering sound you will hear is also known as compressor surge and is bad news. So basically, loosen it up enough that you dont hear fluttering at very low throttle releases, but make sure its hard enough that it doesnt start blowing off boost. It shouldnt be hard to find this "neutral" spot. The fulttering is very noticeable and so is the valve blowing off boost. Go on a backroad where its you and the road (nice and quiet), carry the allen wrench and box wrench with you, and play with it till you are satisfied

What is compressor surge?

Compressor surge is when the air pressure after the compressor is actually higher than what the compressor itself can physically maintain. This condition causes the airflow in the compressor wheel to back up, build pressure, and sometimes stall. In cases of extreme surge, the thrust bearings of the turbo can be destroyed, and will sometimes even lead to mechanical failure of the compressor wheel itself. It is commonly described as a chuffing or fluttering sound depending on the severity. You will know it when you hear it.

 

[ericbev]

I found a video clip of compressor surge for ya.

http://rds.yahoo.com/S=96781308/K=c...38325893/*-http://neil.f-dup.net/Cory-BOV.WMV