Two turbo failures in 3 months - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 11-28-2009, 07:00 PM   #1
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default Two turbo failures in 3 months

Hello,
3 months ago my gt2560r failed at a low pressure, All of a sudden the turbo started to make a terrible noise and the compressor wheel couldnt move freely enough. 3 days later turbo started to smoke like crazy.

Now my gt2871r has the exact same failure. The strange thing is that the failure occured during low boost again.

I run a 0.050 oil restrictor. I cannot determine if this is the problem , or an instant high egt. Something else, is it possible to fail due to boost leak?
Any ideas are welcome.
gianic is offline   Reply With Quote
Old 11-28-2009, 07:06 PM   #2
Elite Member
iTrader: (1)
 
Join Date: May 2009
Location: Jacksonville, FL
Posts: 4,682
Total Cats: 216
Default

The fact that you had two identical failures make me think it must be related to the oiling system, maybe the restrictor is too small
Full_Tilt_Boogie is offline   Reply With Quote
Old 11-28-2009, 07:15 PM   #3
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default

I flirt with this idea too. My concern is that the ball bearing turbos doesnt require much amount of oil.
gianic is offline   Reply With Quote
Old 11-28-2009, 07:26 PM   #4
Senior Member
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

A boost leak may overspin it, so yes, it's possible. How bad was the leak?
ARTech is offline   Reply With Quote
Old 11-28-2009, 07:42 PM   #5
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default

I haven't figure it out yet. I had the boost controller routed to the im. When I adjusted the valve for more boost the only leak I had was from the valve. But isn't this quiet normal?
gianic is offline   Reply With Quote
Old 11-28-2009, 08:30 PM   #6
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

Most (maybe all?) GT turbos come with a built in restrictor. You might also have dirt getting into your feed line, clogging your restrictor and starving the turbo.
Splitime is offline   Reply With Quote
Old 11-28-2009, 08:55 PM   #7
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Quote:
Originally Posted by Splitime View Post
Most (maybe all?) GT turbos come with a built in restrictor. You might also have dirt getting into your feed line, clogging your restrictor and starving the turbo.
I thought it was all actually.
I thought the oil pressure sender feed comes after the filter.
Saml01 is offline   Reply With Quote
Old 11-28-2009, 09:16 PM   #8
Elite Member
iTrader: (7)
 
Join Date: Jan 2007
Location: Renton Washington
Posts: 1,742
Total Cats: 3
Default

Did you ever take off the CHRA?
SKMetalworks is offline   Reply With Quote
Old 11-29-2009, 02:46 AM   #9
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

Just out of curiosity, where are you getting the oil from, and what size line?
dustinb is offline   Reply With Quote
Old 11-29-2009, 04:19 AM   #10
I'm Miserable!
iTrader: (16)
 
Join Date: Dec 2008
Location: where most people are Utarded
Posts: 1,323
Total Cats: 0
Default

both real Garretts or Chinese equivalents?
zoomin is offline   Reply With Quote
Old 11-29-2009, 04:30 AM   #11
Elite Member
 
Join Date: Jul 2005
Posts: 6,454
Total Cats: 80
Default

Quote:
Originally Posted by gianic View Post
I had the boost controller routed to the im.
I haven't heard of actual failures, but in theory, doing this will allow full boost at small throttle openings, which at high engine RPM, requires very high turbo RPMs.
JasonC SBB is offline   Reply With Quote
Old 11-29-2009, 08:12 AM   #12
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default

Quote:
Originally Posted by sbkcocker499 View Post
Did you ever take off the CHRA?
The last work I did before the failure was to change a broken stud on the manifold . Had to disassemble the turbo.


Quote:
Originally Posted by dustinb View Post
Just out of curiosity, where are you getting the oil from, and what size line?
I'm getting the oil from a port next to the oil filter. I'm not sure about the size of the line but you can see it in the picture.


Name:  DC081030008.jpg
Views: 2
Size:  74.1 KB

Quote:
Originally Posted by zoomin View Post
both real Garretts or Chinese equivalents?
Real Garretts.
gianic is offline   Reply With Quote
Old 11-29-2009, 08:35 AM   #13
Elite Member
iTrader: (1)
 
Join Date: Jun 2007
Location: VA, Germany, Afghanistan
Posts: 2,967
Total Cats: 3
Default

Is that how your lines are actually routed when running? If so that may very well be your issue.
KPLAFIN is offline   Reply With Quote
Old 11-29-2009, 08:54 AM   #14
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default

This is the gt2560r setup, but with same lines. Where do you see the problem?
gianic is offline   Reply With Quote
Old 11-29-2009, 11:03 AM   #15
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default

I sent an email to atp and told me that if I send them my old chra they will send me a new one for 466 dollars . Has anybody done this before?
gianic is offline   Reply With Quote
Old 11-29-2009, 11:18 AM   #16
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

I did that with limit engineering (i think?) whom Bell said they use. It is a warranty chra replacement program. Went without a hitch.

Take some pictures of chra angle from vertical. Drain pictures also.
Splitime is offline   Reply With Quote
Old 11-29-2009, 12:10 PM   #17
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

Quote:
Originally Posted by gianic View Post
This is the gt2560r setup, but with same lines. Where do you see the problem?
It looks like your oil is feeding from the side, not the top. The oil should be coming straight down into the turbo, and exiting straight down as well.
dustinb is offline   Reply With Quote
Old 11-29-2009, 12:36 PM   #18
Junior Member
Thread Starter
iTrader: (4)
 
Join Date: Mar 2007
Location: Greece
Posts: 290
Total Cats: 4
Default

Quote:
Originally Posted by dustinb View Post
It looks like your oil is feeding from the side, not the top. The oil should be coming straight down into the turbo, and exiting straight down as well.
It's not on the side, the oil feed is on top of the chra, here is a more recent photo


gianic is offline   Reply With Quote
Old 11-29-2009, 01:35 PM   #19
Elite Member
iTrader: (1)
 
Join Date: Jun 2007
Location: VA, Germany, Afghanistan
Posts: 2,967
Total Cats: 3
Default

Quote:
Originally Posted by gianic View Post
This is the gt2560r setup, but with same lines. Where do you see the problem?
Just looks like a lot of sharp bends to me. probably not much of an issue with the feed given the pressure, I loved my 1.6 and having the feed port right there on the hot side. how/where is your drain running?
KPLAFIN is offline   Reply With Quote
Old 11-29-2009, 01:43 PM   #20
Elite Member
iTrader: (1)
 
Join Date: May 2009
Location: Jacksonville, FL
Posts: 4,682
Total Cats: 216
Default

Im gonna say you dont need a restrictor with the banjo there, since they usual act as a bit of a restriction, not to mention the fact that the turbo may already have a restrictor as others pointed out

hows the drain?
Full_Tilt_Boogie is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
ISO 1.6 turbo cast iron manifold cale saurage DIY Turbo Discussion 16 10-01-2015 12:25 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 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 01:16 PM.