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New guy, getting barn find 924 Turbo back up and running
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Sat Jul 11, 2020 3:39 pm    Post subject: New guy, getting barn find 924 Turbo back up and running Reply with quote

Hey all!

I'm a long-time Porsche guy (my daily is a 958 Cayenne diesel) who just picked up a 1980 924 Turbo.

Short story, I picked up the car after someone bought it for a race car and couldn't get it started. It was last registered in 2006, so probably hasn't run in around 14 years.

It looks like someone really hacked up the wiring on this car, so I've been going through and undoing the butchery.

Anyway, here's a video of the initial progress, with many more to come. I've got a ton of questions for y'all and hope you can help bring this gem back to life.

Sean

https://youtu.be/WHii7kvsQME
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ideola  



Joined: 01 Oct 2004
Posts: 15506
Location: Woodstock IL

PostPosted: Sun Jul 12, 2020 1:34 am    Post subject: Reply with quote

Welcome to the forum! If you haven't seen these threads already, you may find them immensely helpful:
http://www.924board.org/viewtopic.php?t=22724
http://www.924board.org/viewtopic.php?t=28790

Good luck with the restoration!
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75 Fiat X1/9 | 80 US 928 | 80 US 931 '941' | 78 D-Prod Replica | 78 Poli-Form
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jacobroufa  



Joined: 18 Nov 2016
Posts: 291
Location: Rockford, IL

PostPosted: Sun Jul 12, 2020 3:44 am    Post subject: Reply with quote

Awesome! Glad to see someone with motivation to do videos featuring this car. It doesn't get enough love for how awesome they really are.

I hear the S1 is the better one to have, but maybe I'm biased also with a 1980...

Love the interior here -- Chuck on the board also has the brown, tan and tartan interior. Very cool!

Replace all the rubber bits as you said in the video and it'll be a much happier car. The CIS injection hates vacuum leaks.. I've got some leftover correct large braided hose (e.g. for the upper charge tube to the four-way yellow plated hard tube under it, and from the AAV to that same tube) if you want I can send you some at cost let me know... I had to buy several feet of it even though I only needed a few inches, and it's not cheap or widely available. I saw you got the small lines but not the bigger ones under the intake -- it's just easier with the charge tube off, to refurbish the entire loom.

http://www.924board.org/viewtopic.php?p=401098#401098

If you see on the top picture of this post, the two shortest, widest braided hoses on the four-way yellow hard pipe.. that's what I am referring to. And all the rubber elbows -- Guarantee those are source of some leaks too. The bigger diameter one is available through Porsche but for the smaller one the best fitting part is a Dorman elbow for a Ford I believe.. You'll also want to get the elbow and straight connectors on the turbo recirculation valve to the lower intake manifold -- that's a job for when you have things apart to do the timing belt or you'll be cursing a lot..
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1980 Porsche 931
1981 Porsche 924 Weissach
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Sun Jul 12, 2020 8:03 am    Post subject: Reply with quote

Thanks everyone for the encouragement, I'm really excited to get this one back up and running.

Those are some phenomenal links and I'll definitely be going through them asap.

Jacobroufa, thanks for the offer, and I'll be reaching out to you in a bit to discuss the braided hose. I just redid a 66 Thunderbird and replaced around 200 feet of vacuum hose, so this car should be a breeze!

Sean
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2058
Location: MI

PostPosted: Sun Jul 12, 2020 1:32 pm    Post subject: Reply with quote

These cars are actually very easy to work on once you can come to an understanding of them..

Replace all vac lines..
CIS pressure tet.. (haynes)
Injector flow test.. (haynes)
And you're golden..
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80 Turbo - Slightly Modified
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Sat Jul 18, 2020 12:39 am    Post subject: Reply with quote

FINALLY! After a 14 year slumber the 924 Turbo is back to life. It only took undoing a lot of ďrepairedĒ wiring and cleaning the fuel system again. Plus, I took it on my first drive.

Itís got a few issues that need sorting pretty quickly. First, the clutch doesnít feel like itís fully disengaging...I have to shift slow and even then it will grind sometimes. Perhaps it needs a new clutch.

Second, thereís a rattle at about 3000 RPM. It sounds like a heat shield, but is coming from the clutch area. Perhaps itís related to #1 above.

Regardless, thereís still a lot to do. Itís has a wiring short (still) that drains the battery overnight and it needs a LOT of cleaning.

I do need a few parts, and hopefully someone can help.

If you're in the general Colorado area, I'm in need of a few parts for this car:

-Rear spoiler (just the center piece, but will take the whole spoiler if needed)
-Front windshield
-Rear view mirror
-Air filter housing straps

Let me know if you can help!

Thanks for the encouragement and advice, I really appreciate it!

Sean

https://youtu.be/R6qcx-iNbXI
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Harm  



Joined: 02 Apr 2009
Posts: 1358
Location: Holland

PostPosted: Sat Jul 18, 2020 3:47 am    Post subject: Re: New guy, getting barn find 924 Turbo back up and running Reply with quote

Auto Anatomy wrote:
https://youtu.be/R6qcx-iNbXI

FYI Clutch Master Cylinder rebuild kits do exist and start at a minimum price of ~Ä17,-

Like many others Iíve used the FTE product provided by Michael of sportwagenparts.eu

My 2 cents.
Good Luck.
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Sat Jul 18, 2020 3:54 am    Post subject: Reply with quote

Good to know. I briefly looked and couldn't find one, so went ahead and bought a replacement unit. I'd rather rebuild the original units if possible.

Sean
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1107
Location: Washington DC area

PostPosted: Sat Jul 18, 2020 4:24 am    Post subject: Reply with quote

+1 on the Cayenne Diesel!
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Wed Jul 22, 2020 11:06 am    Post subject: Reply with quote

Thanks for all the help. The Cayenne diesel is a great car, and such a workhorse.

As for the 924, the next step is going through all the brakes/suspension and getting them back to life. I'm afraid the car will need a clutch soon as the pedal disengages at the very top and doesn't feel like it's disengaging fully. The transmission will grind unless you shift very slowly and there's a vibration at around 3000 rpm that sounds like it's coming from the clutch area.

Sean
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Thu Jul 23, 2020 7:08 am    Post subject: Reply with quote

OK, strange thing happened today...

I was letting the car warm up (it has been running really well lately) when suddenly it just stopped. I thought it may have been low on fuel, but that doesn't appear to be the case. I've got good fuel pressure, but now no voltage to the coil. I let the car sit for a minute with the battery disconnected, checked voltage at the coil and it was around 6.7V. The car started back up again and then died about 3 seconds later. Now, no voltage to the coil.

I haven't had a chance to troubleshoot yet, but any immediate thoughts?

Sean
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Fri Jul 24, 2020 6:12 am    Post subject: Reply with quote

Looks like the fuel pump relay died, killing the tach signal. When I jumper across 30-87, the car fired right up.

More parts on order!

Sean
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2058
Location: MI

PostPosted: Fri Jul 24, 2020 9:26 am    Post subject: Reply with quote

tach signal could have died causing the relay to stop working..

tach still works fine with no FPR in, but FPR needs tach signal to turn the pump on..
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80 Turbo - Slightly Modified
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Auto Anatomy  



Joined: 11 Jul 2020
Posts: 22
Location: Colorado Springs, CO

PostPosted: Sat Aug 08, 2020 12:10 pm    Post subject: Reply with quote

Getting closer to having the abandoned 924 turbo as a daily driver!

https://youtu.be/sVT7-mCqTlc

Sean
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2021
Location: Somerset, UK

PostPosted: Sat Aug 08, 2020 9:33 pm    Post subject: Reply with quote

Check the turbo overboost switch is earthing. If itís not it kills the FPR.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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