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Old 09-09-2008, 09:46 AM   #1
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Default Greddy type s\rs question

when i adjust the spring on the bov, how do i know if it is correct and not to soft\hard?
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Old 09-09-2008, 11:26 AM   #2
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By when it opens. if you are getter turbo flutter it's too tight. If it's not building boost as quick it's too loose. I rev mine from up in the engine bay and set it so it just opens a lil when released. It should leak at idle, by leak i mean it should be sucking air in slightly.
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Old 09-09-2008, 11:33 AM   #3
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I have one of the springs inside my unit removed, the softer of the two.

I tighten it until I get some flutter when I lift, then loosen it until it blows off clean. Too loose and it chirps loud of ****, when it's just right it should just whoosh and leak ever so slightly at idle.
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Old 09-09-2008, 04:01 PM   #4
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ok, so when it is at idle only i should notice that it sucks air slightly, and when i rev it in nutral it should make a little noise..... i thought that the engine should hawe resistance before i should hear the bov... ?
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Old 09-09-2008, 04:16 PM   #5
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Nah, you can get the BOV to make noise in neutral, there doesn't need to be a load on the motor.
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Old 09-09-2008, 04:20 PM   #6
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You won't be making any significant boost just revving in neutral, but you'll get the compressor spun up and have enough air moving that when you release the throttle it will vent slightly if you have it set loosely enough. It won't be terribly loud, but it'll be audible.
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Old 09-09-2008, 05:17 PM   #7
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it can be heard with enough throttle....only builds 1-2psi

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Old 09-09-2008, 05:29 PM   #8
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ok i thought i might had it set wrong, beccauce when i am at full boost on a long road the boost is going to 0,8 bar and then it goes down to 0,65, maby the greddy turbo is to small then (i dont hawe stable boost at 0,8bar) i thought maby it was a leak somewhere, baby it helps to get a new acuator (wastegate) at the turbo?
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Old 09-09-2008, 05:32 PM   #9
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search "helper spring"
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Old 09-09-2008, 05:43 PM   #10
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Two things about the turbo that comes with the Greddy kit:

1- The wastegate can sucks.

2- (more importantly) If you add an intercooler, you need to relocate the vacuum line that actuates the wastegate can to a location after the intercooler.

Actually, the latter point is pretty much universally applicable. For a given MAP and VE, as RPM increases, the volume of air passing through the intercooler increases. Pressure drop across the intercooler is a function of airflow- the greater the volume of air you're passing through it, the greater the pressure drop across it. So the WG winds up maintaining a constant pressure in the portion of the system before the IC, while pressure after the IC drops as RPM increases.
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Old 09-09-2008, 05:57 PM   #11
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thank you guys! What a great forum! i hawe an intercooler, but hawe not mooved the vacum line....
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Old 09-09-2008, 06:12 PM   #12
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hmm exaxtly what should i do? get a vacum-line from the intake manifold to the actuator, and blend the hose on the turbo?
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Old 09-09-2008, 06:37 PM   #13
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Not from the intake manifold itself, but from the pipe between the intercooler outlet and the throttle body. Then just plug up the old hole on the compressor with a cap.
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