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Uh oh...just bought an '82 931!

 
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bureau13  



Joined: 07 Sep 2017
Posts: 18
Location: South Florida

PostPosted: Fri Oct 06, 2017 11:53 pm    Post subject: Uh oh...just bought an '82 931! Reply with quote

I don't have pictures of my own yet, because I just won the auction...the car is still several states away. However, you can see it here: https://bringatrailer.com/listing/1982-porsche-924-turbo-931/?blm=1

It has a mysterious unknown ignition system, so digging into that should be fun, but otherwise seems to be a nice driver...actually, that's misleading, as it seems to be a nice driver regardless, but I will definitely need to understand what that ignition system is and what it's doing.

I don't know too much about other maintenance history, save that the turbo was rebuilt a few years ago, and the seller did not know when the timing belt was last changed, which to me means it should be changed fairly promptly.

Any other thoughts on "immediate" needs that should be addressed, or at least investigated?

I come from the 928 world, so timing belts, soft fuel lines and power steering high pressure hoses all typically fall into that category with that car.

I will get more info regarding exactly what's been done over the last year or two by the time the car is delivered...
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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morghen  



Joined: 21 Jan 2005
Posts: 7674
Location: Romania

PostPosted: Sat Oct 07, 2017 12:04 am    Post subject: Reply with quote

Timing belt, water pump, good oil..dont go cheap here.
Cam oiler elbow...then see how it drives
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red 924 and not red 924
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bureau13  



Joined: 07 Sep 2017
Posts: 18
Location: South Florida

PostPosted: Sat Oct 07, 2017 1:03 am    Post subject: Reply with quote

Is there a recommended water pump? In the 928 world, we've had a terrible time with water pumps. The Porsche-branded ones are crazy expensive, and most of the cheaper aftermarket pumps seem to leak, seize or eat into the block.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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morghen  



Joined: 21 Jan 2005
Posts: 7674
Location: Romania

PostPosted: Sat Oct 07, 2017 2:33 am    Post subject: Reply with quote

I always used hepu
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red 924 and not red 924
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1418
Location: Not Detriot - NMI

PostPosted: Sat Oct 07, 2017 7:23 pm    Post subject: Reply with quote

Congrats!

Timing belts are cheap and easy on these, like $30 and done..
Water pump doesn't matter as much as in the 928/944 because they aren't on the timing belt..

I'd do an injector flow test on it just because, ngk copper plugs, timing belt, drive the crap out of it..

Sweet car..
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1980 931S LSD FMIC hobby - 01 RS25 coupe - 95 M3 coupe
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Paul  



Joined: 02 Nov 2002
Posts: 9285
Location: Southeast Wisconsin

PostPosted: Sun Oct 08, 2017 7:10 am    Post subject: Reply with quote

Find and correct the oil leak that's coating the tranny.



https://bringatrailer.com/wp-content/uploads/2017/09/IMG_6774-1.jpg
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
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Ian89C4  



Joined: 01 Apr 2011
Posts: 480
Location: North Carolina

PostPosted: Sun Oct 08, 2017 9:39 am    Post subject: Reply with quote

Love the color!


Agree with the others above on initial maintenance.

The wet trans looks like a lose or ill fitting bottom drain plug. I wouldn't drive until inspecting further.

Happy motoring!!
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Ian Edgerly
Spiveys Corner, North Carolina

Current:
1981 924 Weissach Race Car ("Serenity")
1980ish 931 ("Alice")
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bear924  



Joined: 26 Jul 2005
Posts: 70
Location: South West Queensland, Australia

PostPosted: Sun Oct 08, 2017 11:30 pm    Post subject: Reply with quote

Neat looking car, not that many 82 models around either. Suspect that once you have it sorted you'll find it a great little car.
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bureau13  



Joined: 07 Sep 2017
Posts: 18
Location: South Florida

PostPosted: Tue Oct 10, 2017 12:46 am    Post subject: Reply with quote

Thanks everyone. I'm excited for it to get here! I will definitely check out that goopy transmission.

I've ordered the Haynes manual, which I've seen recommended a few places, so hopefully that has pretty good info regarding the timing belt job, etc. I did that on my 928, which was a fairly involved and long (I'm slow, plus a lot of other stuff to take care of popped up) process, but it does sound like this is quite a bit easier (and cheaper!) on this car.
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Tue Oct 10, 2017 6:09 am    Post subject: Reply with quote

bureau13 wrote:
I've ordered the Haynes manual

Good start, but unfortunately, the Haynes doesn't cover nuances unique to the 931, and especially a late-run series 2. PM me with coordinates and I can hook you up with other more authoritative reference material.

RE: water pump, GEBA is the most common brand available here in the states, and I've never had any complaints on my own cars or from customers. I specialize in the 924 and would appreciate the opportunity to earn your patronage: http://garage.ideola.com/

As I posted on BAT, I'm very curious about the ignition system. I would want to know what distributor is being used, whether it is controlled electronically, and whether the system retains the IAT and MAP references to manage timing. If not, you'll want to proceed with caution. It's probably OK in relatively stock form with easy street driving, but I would be very careful about extended boost runs, especially in hot weather, until we know how that system functions. If they just slapped in an S1 distributor ... or worse, one of the NA distributors ... you're going to have less than ideal ignition curve.

Congrats on the acquisition, and welcome to the forum!
_________________
15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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bureau13  



Joined: 07 Sep 2017
Posts: 18
Location: South Florida

PostPosted: Wed Oct 11, 2017 1:37 am    Post subject: Reply with quote

I have been poking about your website At some point I want your air-water intercooler I think...but fist things first. I too am very curious about that ignition system. Comparing to other S2 engine bay pictures, it looks like on this car there is a wire grounded to the valve cover, and no wire going to some sensor in the air tube that attaches to the intake manifold....I was wondering if this is the IAT sensor and they've just grounded that wire? I could be all wrong here...but that was definitely different from other car pics with which I compared it.

PM incoming...
_________________
-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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ideola  



Joined: 01 Oct 2004
Posts: 15462
Location: Woodstock IL

PostPosted: Wed Oct 11, 2017 2:29 am    Post subject: Reply with quote

bureau13 wrote:
it looks like on this car there is a wire grounded to the valve cover, and no wire going to some sensor in the air tube that attaches to the intake manifold....I was wondering if this is the IAT sensor and they've just grounded that wire?


It's more likely that it's the lead to the overboost switch. It is common to have these bypassed by simply tying them to ground. With the DITC gone, there would be no reason to connect the IAT to anything at all, as it is only used by the DITC.
_________________
15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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