No muthafu*king boost.. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 07-15-2010, 08:21 PM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
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
caideN is offline   Reply With Quote
Old 07-15-2010, 09:13 PM   #2
Elite Member
iTrader: (17)
 
Join Date: Aug 2007
Location: Fort Myers, FL
Posts: 2,791
Total Cats: 130
Default

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).
pdexta is offline   Reply With Quote
Old 07-15-2010, 09:17 PM   #3
Senior Member
iTrader: (3)
 
Join Date: Jul 2005
Location: Connect-I-Cut
Posts: 1,431
Total Cats: 0
Default

Is the wastegate stuck open? Try opening and closing it by hand
miataspeed2005 is offline   Reply With Quote
Old 07-15-2010, 09:27 PM   #4
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

Quote:
Originally Posted by pdexta View Post
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.

Quote:
Originally Posted by miataspeed2005 View Post
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.
caideN is offline   Reply With Quote
Old 07-15-2010, 09:41 PM   #5
Senior Member
iTrader: (7)
 
Join Date: Jul 2007
Location: Milpitas, CA
Posts: 1,057
Total Cats: 1
Default

Quote:
Originally Posted by caideN View Post
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.
Marc D is offline   Reply With Quote
Old 07-15-2010, 09:47 PM   #6
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

Quote:
Originally Posted by Marc D View Post
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
caideN is offline   Reply With Quote
Old 07-16-2010, 12:52 AM   #7
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,109
Total Cats: 518
Default

What's your wideband say?
curly is offline   Reply With Quote
Old 07-16-2010, 03:39 AM   #8
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

Quote:
Originally Posted by curly View Post
what's your wideband say?
wot 11-12
caideN is offline   Reply With Quote
Old 07-16-2010, 02:46 PM   #9
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

So I did Joe Perez's way of connecting the MBC to the Cold pipes. Same problem
caideN is offline   Reply With Quote
Old 07-18-2010, 02:10 PM   #10
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

Is this suppose to be loose? I checked the shaft play and it was fine, but then that piece came loose.



caideN is offline   Reply With Quote
Old 07-18-2010, 02:41 PM   #11
Senior Member
iTrader: (14)
 
Join Date: Aug 2008
Location: Tinley Park, IL
Posts: 1,488
Total Cats: 0
Default

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.
lordrigamus is offline   Reply With Quote
Old 07-18-2010, 08:07 PM   #12
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

Quote:
Originally Posted by lordrigamus View Post
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.
caideN is offline   Reply With Quote
Old 07-18-2010, 08:21 PM   #13
Senior Member
iTrader: (14)
 
Join Date: Aug 2008
Location: Tinley Park, IL
Posts: 1,488
Total Cats: 0
Default

How about any questionable couplings? May be a boost leak somewhere? Are you lifting the BOV under boost?
lordrigamus is offline   Reply With Quote
Old 07-18-2010, 10:49 PM   #14
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Jan 2010
Location: SF Bay Area
Posts: 142
Total Cats: 0
Default

Quote:
Originally Posted by lordrigamus View Post
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
caideN is offline   Reply With Quote
Old 07-18-2010, 11:03 PM   #15
Senior Member
iTrader: (14)
 
Join Date: Aug 2008
Location: Tinley Park, IL
Posts: 1,488
Total Cats: 0
Default

Are you running a BOV?
lordrigamus is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
HF-mx5t's 3076 turboed trackday/street toy :) hf-mx5t Build Threads 151 11-16-2014 02:42 PM
another 91 greddy.. but its clean atleast :) amak87 Media 42 12-27-2011 07:44 PM
Quality turbo pieces to complete your setup... Panasports etc.. aug Miata parts for sale/trade 11 09-20-2010 01:11 PM
ECU Decisions, Xede or Hydra orr Adaptronic Serper3 ECUs and Tuning 26 04-09-2009 07:12 PM
MAF IAT Values elesjuan MEGAsquirt 12 01-26-2008 05:03 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:02 PM.