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Old 06-04-2007, 12:22 AM   #1
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Default I think my WG is done :(

I spike to 10 psi and as i apraoch redline it drops to near 7 psi it was fine this morning. i hope turning up the MBC helps me fix this. Would anything else cause this besides WG issues?
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Old 06-04-2007, 12:24 AM   #2
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internal or ex?
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Old 06-04-2007, 12:25 AM   #3
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internal stock 16g WG before i ran 8 psi with just WG and i had the MBC on there and was making a good 10 psi across the baords before
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Old 06-04-2007, 12:30 AM   #4
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well...the MBC would cause it to spike because it's just a ball and spring... is this what u are talking about? it spiking and then dropping ?
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Old 06-04-2007, 12:31 AM   #5
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no before it went to 10 psi and held steady +-1 psi now it is droping down to like 6 psi around redline.
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Old 06-04-2007, 12:34 AM   #6
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ohhhh...dang... possible BOV leak? if you're boosting more.
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Old 06-04-2007, 12:35 AM   #7
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no bov in place
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Old 06-04-2007, 12:44 AM   #8
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if it were Externally gated i'd say take the MBC off and adjust it to 6-7 psi and then put the BC on to adjust it up to 10.... BUT lol

are u using a bleeding MBC?

i don't know, how often do wg springs go bad?
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Old 06-04-2007, 02:05 AM   #9
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How is spool? Exhaust leak could cause this.
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Old 06-04-2007, 02:38 AM   #10
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spool is good here is a log. Ive had exhaust leak i get boost the same as before but it does not carry for ****.
Attached Files
File Type: zip nightfile.zip (295.4 KB, 55 views)
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Old 06-04-2007, 02:50 AM   #11
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Its probably from not having an intercooler and no proper crankcase ventilation system.
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Old 06-04-2007, 02:58 AM   #12
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that was just mean.
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Old 06-04-2007, 03:11 AM   #13
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My experience with an exhaust leak from turbo to manifold limited my boost to about 7psi and spool sucked a bit.
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Old 06-04-2007, 09:45 AM   #14
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that's why i asked if you had an open wastegate line, your boost didn't seem to spool like it should....try a helper spring and see how it reacts.

but you're dropping to 5psi, the actuator must be toast...
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Old 06-04-2007, 10:15 AM   #15
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i was criuseing and then going into spool to make sure my tip in was right and most of the time i was launching the car, only 1 or twice did i let it caost down and start sub 2K rpm and see if the spool was the issue.
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Old 06-04-2007, 11:14 AM   #16
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well as of 2 minutes ago i am thinking it is the clutch my other WG feels about the same and i even ran with No line on the WG and it still dropped after 4K rpm. So i will bleed it later and hopefully that solves the problem :( god damn ACT extreme with 4 puck unsprung disk should be tougher than that damn you prostreet.
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Old 06-04-2007, 11:17 AM   #17
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with an internal gate, hook up a line to it and blow in it. If no air leaks, its proably still good. if the diaphragm is ripped, you will have a leak
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Old 06-04-2007, 11:20 AM   #18
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i highly doubt it's your clutch...

whats weird I'm looking at your datalogs, and i guess maybe your 4th gear pulls from down low your wastegate hits and maintains 8psi....but with your gun it through the gears it looks like you are spiking a 8-9psi and dropping to 4.

If it was your clutch then the RPMs would rapidly increase, your rpms are still very linear.
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Old 06-04-2007, 11:25 AM   #19
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yes but i totally disconected the WG from vaccum source i tried it with my hand pump and it takes 12psi to actuate just fine. I think it is only slipping enough to unlaod me becouse the power falls off with the boost. And if my WG was shot internally i would never hit 10 psi. Like i said i will bleed it unless there would be a reason my motor wouldn't put out 10 PSI towards redline?
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Old 06-04-2007, 11:33 AM   #20
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did you drive that way? how did it react then?
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