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No muthafu*king boost..

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Old 07-15-2010, 07:21 PM
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Default No muthafu*king boost..

After installing MS on my greddy setup I'm not getting boost over 5psi. The limit set on MS is 11psi and I've adjusted the WGA/MBC over and over again, but same result. It gets up to 5psi of boost when cold, but when all warmed up it gets down to 3-4psi only.

I unhooked the WGA hose from MBC and got only 3psi steady. ( I thought it would be at least 7PSI) I have yet to try Joe Perez's way by hooking up the lines to the cold pipes rather than the compressor itself. I am going to though, I'm currently waiting for the JB welds to dry on the barb on the cold pipe.

I have a helper spring on my wastegate, but it doesn't seem to help for ****..

I took off all the pipes to check for leaks; nothing.

I'm still a
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Old 07-15-2010, 08:13 PM
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What's happening when you are getting to 5psi? Is it breaking up (like hitting a rev limiter) or is it just continuing to pull (albeit slowly).
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Old 07-15-2010, 08:17 PM
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Is the wastegate stuck open? Try opening and closing it by hand
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Old 07-15-2010, 08:27 PM
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Originally Posted by pdexta
What's happening when you are getting to 5psi? Is it breaking up (like hitting a rev limiter) or is it just continuing to pull (albeit slowly).
It's a steady 5PSI, when it gets up to higher RPMs it sounds like the engine about to blow, but it's still picking up speed, but slowly. I initially thought it was the clutch, but it ran fine at 7PSI w/o MS back then. I tried some diagnostics and it seems like the clutch is fine.

Originally Posted by miataspeed2005
Is the wastegate stuck open? Try opening and closing it by hand
It's not stuck open. Even took out the DP to check, it was fine.
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Old 07-15-2010, 08:41 PM
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Originally Posted by caideN
It's a steady 5PSI, when it gets up to higher RPMs it sounds like the engine about to blow, but it's still picking up speed, but slowly. I initially thought it was the clutch, but it ran fine at 7PSI w/o MS back then. I tried some diagnostics and it seems like the clutch is fine.



It's not stuck open. Even took out the DP to check, it was fine.
That's really weird man. If you can't figure it out this week, call me up, well try to figure it out.
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Old 07-15-2010, 08:47 PM
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Originally Posted by Marc D
That's really weird man. If you can't figure it out this week, call me up, well try to figure it out.
Haha alright. I'm just trying to figure this thing out so I don't have to bother you
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Old 07-15-2010, 11:52 PM
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What's your wideband say?
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Old 07-16-2010, 02:39 AM
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Originally Posted by curly
what's your wideband say?
wot 11-12
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Old 07-16-2010, 01:46 PM
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So I did Joe Perez's way of connecting the MBC to the Cold pipes. Same problem
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Old 07-18-2010, 01:10 PM
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Is this suppose to be loose? I checked the shaft play and it was fine, but then that piece came loose.



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Old 07-18-2010, 01:41 PM
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Yes, the heat shield will move around a bit until you put on the turbine housing.

Does it spin freely? It looks like there's quite a bit of oil on the exhaust side. Does it have so much play that it could twist and bind on either housing?

Does it even have the heat shield on it? It's hard to tell from the pic, your art skills are covering it up.
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Old 07-18-2010, 07:07 PM
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Originally Posted by lordrigamus
Yes, the heat shield will move around a bit until you put on the turbine housing.

Does it spin freely? It looks like there's quite a bit of oil on the exhaust side. Does it have so much play that it could twist and bind on either housing?

Does it even have the heat shield on it? It's hard to tell from the pic, your art skills are covering it up.
Oh sorry, I was just using those images to be specific. That's not my turbo. My shaft does not have any freeplay and it doesn't hit the housing.
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Old 07-18-2010, 07:21 PM
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How about any questionable couplings? May be a boost leak somewhere? Are you lifting the BOV under boost?
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Old 07-18-2010, 09:49 PM
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Originally Posted by lordrigamus
How about any questionable couplings? May be a boost leak somewhere? Are you lifting the BOV under boost?
Idk. It whistles slightly when letting off the gas @ about 3k+rpm
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Old 07-18-2010, 10:03 PM
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Are you running a BOV?
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