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Join Date: Oct 2005
Location: Northern California
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951 Exhaust Blast from the Past
Just for fun...
This factory part failed on my modified 951 back in 1998 on the way to the Historics at Laguna Seca. Took a while to find the cause of the "low boost" symptom and stumped some of the best. This factory exhaust center section was dissected using a borrowed sawzall at Partsheaven. I took some pics last weekend as I was finally discarding the leftover pieces. Some time ago, my friend, the late Jim Pasha, took some pictures... they never made it into an article however. 
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Mike PCA Golden Gate Region Porsche Racing Club #4 BMWCCA NASA |
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09-21-2009, 01:03 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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What could have caused that to happen?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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09-23-2009, 05:20 AM
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manufacturing defect?
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Mike - CFI, A&P Mechanic w/ I.A., Aztec driver at Island Tyme '88 951S - zermatt silber/black - staying stock. purchased in 11-2006 '84 944 - gemini grau/tan+brown - lightly modified. purchased in 11-2001 2021 Tesla Y - to get me to work |
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09-24-2009, 09:03 AM
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vtec kicked in?
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!) |
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09-24-2009, 10:49 AM
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over run on the turbo pulling a vacuum on the exhaust?
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09-24-2009, 10:50 AM
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your average wrencher...
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when muffler bearings fail.....pure carnage!
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1982 931 *project* 1986 951 Garrett turbo, Rogue Tuned (sold  )1987 944S chipped, konis, rollbar (traded) 1979 924 total rebuild and blueprinted (sold) |
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09-24-2009, 06:05 PM
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In the Fires of Hell.....
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Personally I think that Magneto got a hold of this exhaust pipe and did his dirty work
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PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost |
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09-24-2009, 10:05 PM
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Architect / Car Guy
Join Date: Jan 2009
Location: Atlanta, Ga
Posts: 699
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Quote:
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Looking Forward to getting my First "car" Porsche 951 |
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09-25-2009, 01:25 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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Quote:
And what kind of dirty work is it, exactly, that he does?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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09-25-2009, 03:06 PM
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In the Fires of Hell.....
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You need to watch an X-Men movie....... Don't get out much, eh?
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PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost |
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09-25-2009, 09:56 PM
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Check this link at 944OnLine. Explains what happened.
944 Online Forum - The Porsche 944 Forum For The 944 Enthusiast.
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'86 944 Turbo You have to be a masochist to love something so frustrating. |
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09-27-2009, 06:52 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Quote:
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-02-2009, 10:04 AM
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In the Fires of Hell.....
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Quote:
FWIW, Magneto can bend metal with his powers, hence the reference 
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PCA Instructor: '88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost |
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10-02-2009, 07:04 PM
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Registered
Join Date: Oct 2005
Location: Northern California
Posts: 3,747
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I originally posted about this in 1998 on Porshefans or whatever we had at the time. Immediately fixed several cars that folks were having trouble diagnosing. When Pasha was over taking pictures for the two articles about engine building in Excellence, we took some pictures of these parts, but we never followed up to get a technical Q&A on this problem into the magazine.
This issue stumped many back then including Milledge. The fellow that pointed me in the right direction was a pro mechanic and ex pro racer (IMSA), and is still a friend. He had seen this in a customer car-- a silver rose turbo s... the one on the cover of the PCNA water cooled parts catalog from back in the day. Blast from the past.
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Mike PCA Golden Gate Region Porsche Racing Club #4 BMWCCA NASA |
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10-02-2009, 07:36 PM
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Avatar's are to SMALL.
Join Date: Jul 2009
Location: Belvidere, NJ
Posts: 1,051
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Quote:
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1986 951 - Wrecked. Being used for engine swap and parts. 1987 944 - SCCA specification track/ street car. Awaiting 951 engine and parts. |
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10-04-2009, 10:59 PM
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Registered
Join Date: Jan 2009
Location: Reno, NV
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Oh wow!! Hey Mike! I remember when Mat figured that one out. We used to use that 944 TS for running parts around town. I think it made its way into an autocross one time, too.
 Anyway, it's great to see that pic as it brings back memories...
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Don Weaver-EBS Racing don@ebsracing.com 2006 Cayman S '86 944T '00 Boxster with EBS Racing 3.4 liter engine |
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10-05-2009, 04:02 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Quote:
On a more serious note, why is the pipe double-walled, anyways? It can't be to retain heat energy, because it is AFTER the turbocharger. And it can't be to maintain longevity, because it is stainless, and won't rot through, anyways. Does anyone know, or think they know? Or guesses, maybe?
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-11-2009, 10:47 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
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It feels funny answering my own post, but after thinking about it for a day (not continuously), I came up with an educated guess.
My guess is that it IS to retain heat, but not for the reason of retaing energy. Must be to block heat from escaping for reasons of being able to place the pipe closer to the firewall, body, and other parts of the car without cooking them, right? The reason I suspect this is that we all know how tightly things are packed under the hood of these cars.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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10-12-2009, 05:14 AM
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Grey car
Turbo
1986 Porsche 944 turbo
944 Turbo
1986 Porsche 951
