Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Jan 2009
Location: DC
Posts: 1,210
Garage
Porsche Crest Turbo shaft snapped in half

I was driving along when some youngsters pulled up an WRX STi , Great here we go..he he he I nail it ... I pulled away.... nice but then clank.. wtf , I thought i bent the valves, but when I turned the engine off something was still rattling for a few seconds afterwords, then i realized it was the turbo, When took the turbo out and apart the shaft was broken in half , why would this happen ? can some shed some light on this ? I have sense replaced the cartridge with a new one,
__________________
1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 02-27-2014, 01:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
mark houghton's Avatar
 
Join Date: Jul 2008
Location: Central Washington State
Posts: 3,794
Wow, never heard of that happening. Flaw/stress crack in the shaft??? How does the turbin wheel look....did it suck something up and slam into the wheel?

Got me on this one. Brian B. most likely can shed some light on possibilities.
__________________
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 02-27-2014, 02:28 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Jan 2009
Location: DC
Posts: 1,210
Garage
the wheel on the cool side was chewed up, don't know how, every thing was tight
__________________
1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 02-27-2014, 02:54 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Brando
 
quattrorunner's Avatar
 
Join Date: May 2006
Location: Las vegas
Posts: 6,004
Garage
I feel your pain. My bearing$ let go and ruined my gt30r chra.
Through no fault of the turbo, I must have left a tiny object inside the up pipe and it went back into the compressor wheel nicking it. At high speeds, tiny nicks make out of balance problems as you probably know. My fault.
__________________
Turbo powa!
1977 911s. it's cool

Last edited by quattrorunner; 02-27-2014 at 02:58 PM..
Old 02-27-2014, 02:56 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
how is your blow off valve working?
Old 02-27-2014, 03:04 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Jan 2009
Location: DC
Posts: 1,210
Garage
i probably should lube it up and make sure working freely , it uses a red grease,
__________________
1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 02-27-2014, 03:56 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
If the blow off valve isn't opening when you let off the gas quickly under full boost acceleration between upshifts the compressor surge pushes the compressor wheel against the thrust bearing hard and tries to reverse the direction the turbo is spinning.
That could cause the shaft to break.
Old 02-27-2014, 04:05 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
oilonly's Avatar
 
Join Date: May 2008
Posts: 1,148
Quote:
Originally Posted by JFairman View Post
If the blow off valve isn't opening when you let off the gas quickly under full boost acceleration between upshifts the compressor surge pushes the compressor wheel against the thrust bearing hard and tries to reverse the direction the turbo is spinning.
That could cause the shaft to break.
Yikes, i'm gonna adjust mine a smidge softer after reading that.
__________________
'87, Modified WUR, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD
Old 02-27-2014, 04:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,726
Quote:

Quote de JFairman



If the blow off valve isn't opening when you let off the gas quickly under full boost acceleration between upshifts the compressor surge pushes the compressor wheel against the thrust bearing hard and tries to reverse the direction the turbo is spinning.

That could cause the shaft to break.

Yikes, i'm gonna adjust mine a smidge softer after reading that.
If it doesn't make a "chi-chi-chi" sound after letting off under boost, you're fine.
Old 02-27-2014, 04:55 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Rocket Scientist
 
Join Date: Jun 2008
Location: Detroit
Posts: 909
I would guess, and it is just a guess without some pics, is that an object went into your compressor wheel. Be sure to look in the intercooler for junk, or your new turbo might meet the same fate as this one.
Old 02-27-2014, 05:23 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,726
What kind of turbo? Did I miss it?
Old 02-27-2014, 05:40 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Jan 2009
Location: DC
Posts: 1,210
Garage
The turbo is an turbonetics / Garett hybrid dual scroll t3/t4 60-1 , 0 trim , 84AR , old school
__________________
1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 02-27-2014, 08:23 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,726
I have the same turbo lying around, unfortunately the bearings are shot and the wheels have kissed the housings on both ends.

The turbine shaft is salvageable.
Old 02-27-2014, 08:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,726
60-1's hit hard!!!
Old 02-27-2014, 08:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
Registered User
 
Join Date: Jan 2009
Location: DC
Posts: 1,210
Garage
Tippy , I'm in San Antonio did you want donate your old turbo, I plan being Austin on the 4th of March
__________________
1986 944 turbo -first car
1997 993 Cab 6 speed-sold
1992 964 C2 turbo
SOLD, 911GT ,CIS, 428 fwhp 450 trq, Carrillo rods, 964 cams, TT retainers,7.5 comp 1.1 bar boost 320 ml black fuel head 009 injectors, 044 pumps, 60-1 T4/T3 dual scroll turbo
Old 02-27-2014, 08:43 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,726
I just reread. You are a T3, mines a T4 "P" trim. 64mm exducer essentially.

No worky.

I think the CHRA's are different for T3's and T4's?
Old 02-27-2014, 08:51 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,628
Garage
I think you got off lucky Helio. It would appear that something on the cold side went through the blades. It takes just a tiny piece of rock or metal to lodge between the turbine wheel and housing for a split second to pop the shaft. The blades can explode at that point if spinning fast enough when hitting the housing. I would inspect everything from the air meter assembly to the down pipe before putting on a new turbo.
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 02-27-2014, 09:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered User
 
Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
I just looked at your list of modifications and it looks like you have CIS and it's set up about as good as it gets. You even have 7.5:1 compression ratio which I think would be all around better than stock 7:1 for driving on the street.
Anyway, with CIS and it's convoluted intake air plumbing and airflow meter back there near the firewall I don't see how any solid objects could get into the turbo intake and destroy the compressor wheel unless you were running with no air filter and tossing stones at the air sensor plate.

I've heard the chirping sound when there is no blow off valve opening right when closing the throttle under full boost in EFI motors. With CIS I don't know if the CIS airflow meter housing would muffle it too much to hear it over a loud exhaust.
I think you would have still heard it and I don't know if you have an after market BOV venting to atmosphere.
Your hybrid turbo may have been defective too.
Good luck with it. Those things are expensive.

Light weight faster spooling ceramic compressor wheels are coming and when they suck in something hard they shatter and blow to pieces.
Old 02-28-2014, 06:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
 
Registered User
 
Join Date: Jul 2013
Location: Menomonee Falls,Wisconsin
Posts: 148
Garage
I have seen more than one turbo fail like that (not on my car on big trucks) so you are not alone. Good luck with finding a new turbo.
Old 02-28-2014, 07:43 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #19 (permalink)
Registered User
 
T77911S's Avatar
 
Join Date: Oct 2006
Location: MYR S.C.
Posts: 11,314
someone just posted a k27 7006 for sale
__________________
86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 02-28-2014, 07:54 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 08:50 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.