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Please critique this 930 3.5 TT w/ EFI

So my hunt for a 930 continues and here is my latest find.
It is a '79 930 modified to 3.5L with twin turbo running EFI. The big caveat is #4 cylinder has no pressure so its either dropped valve and/or burnt piston. Dyno shows it was making 500+ rwhp before.

I'm of course most concern about the damaged cylinder. From what I read, it could range from a simple top end valve job to a complete engine rebuild.
In one of the pic it show that the compression varies from 100 - 125psi. What does it tells me? Is it too big a range for a big bored twin turbo engine?

As clueless as I am about Porsche, I'm including some pics so experienced eyes here can scrutinize and see what else could be said about this car.
:

Last edited by hchc; 06-24-2010 at 09:38 PM..
Old 06-23-2010, 07:50 PM
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The engine sound pad has severely deteriorated and looks like one of the cv boots has dislodged. To me, it looks like it hasn't been maintained very well. Considering a lot of money has been spent on the engine. Hopefully this car is relatively inexpensive
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Old 06-23-2010, 08:00 PM
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I agree with Alf, this car mechanical looks like crap, you'd better be prepared to spend lots of money to bring this back to a descent driving car, so it better be cheap. What does the rest of the body look like?
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Old 06-24-2010, 05:35 AM
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Figure minimum $10K for the engine overhaul with you doing most of the work.

I can't see the pics.
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Old 06-24-2010, 05:45 AM
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wow thanks for all the insight! Can you elaborate what cause you to think this car is crap? what do you see that needs to be fix/replace?...aside from the mud that is all over place and the damaged CV joint. I'm learning so hopefully I could apply the knowledge in the future

Body-wise its actually decent. Straight, no rust. I would give it a 8/10
Interior is so-so. Seat is shot, dash started to peel from the heat, but carpeting looks new.

I forgot to mention the motor only has 39k miles but I guess it doesn't matter if its poorly maintained or abused...Btw is the compression range 100-125 psi a bad indication that points to a complete rebuild in the near future?

Last edited by hchc; 06-24-2010 at 09:39 PM..
Old 06-24-2010, 08:01 AM
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pics aren't visible?
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Old 06-24-2010, 07:37 PM
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ok I've re-upload the pics here.

I have now read that the Andial 100mm kit is known for its short life especially for turbo application. Maybe that explain the blown piston...

So how much would it cost to go back to 3.3 or 3.4? The casing has already been machined afaik so I would need to replace with stock casing as well?










Last edited by hchc; 06-24-2010 at 09:40 PM..
Old 06-24-2010, 08:43 PM
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Pics of the car? I see lots of rust on all the steel bolts, brackets, fittings. Is this car located in the rust \ snow belt? It would be neat to pull the motor, clean up the wiring while it was being rebuilt and address the cosmetic issues.

Interesting car.
Yasin
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Old 06-25-2010, 04:11 AM
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Seems pretty rough, looks like a lot of restoration.
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Old 06-25-2010, 05:40 AM
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In terms of costs, you will be on a slippery slope. Looks like it has been driven hard with little or no maintenance. Engine rebuild, and while the engine and transmission is out, possibly new clutch components, new sound pad, comparment detailing, and then perhaps suspension and brakes should also be considered. The list in this case is never ending.
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Old 06-25-2010, 05:44 AM
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I brought a 77 930 last year. It was running. Lets just say, I've spent around $18,000 with the engine rebuilt, machine shop, struts, upgrade turbo brakes, inter-cooler and interior.

The truth is, i wouldn't do it any other way. Yes you can spend $25,000 to $30,000 on a nice 930. Or get one that after your done with it, you KNOW what you have.
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Old 06-25-2010, 06:29 AM
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Quote:
Originally Posted by gruppe75 View Post
In terms of costs, you will be on a slippery slope. Looks like it has been driven hard with little or no maintenance.
Have to agree.. You'd be sailing 'closer to the wind' than I did (and I wish I'd maybe spent a bit more getting a more solid car to start with).

I think that thing would make a great 'donor car' but little else. Honestly, it looks like you're going to have to rebuild just about everything. You're going to have to assume that nothing works..

Take, for example, the engine. If you rebuild it yourself, it'll cost you about 3,500 (sorry, don't know what that is in $) ; if you get somebody who knows what they're doing to rebuild the engine, it'll cost you 10,000. If the gearbox needs a complete rebuild, that'll cost 2,500.. The front disc brakes, 600.

Honestly, buy a better car and THEN tune it to 500RWHP - it'll be cheaper (and quicker to do)
Old 06-25-2010, 06:37 AM
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is that the compression test results marked on the body? 0 is not good.....
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Old 06-25-2010, 11:09 AM
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Thanks for all the inputs. It looks like this might ends up a $30k+ car with countness hours of labors...which is probably not for noobs like me

@Yasin: No this is a Texas car. It might have been stored outside for long I'm not sure. I could imagine all the condensation at nite causing that

@lite75: yes #4 is blown or dropped valve. Aside from that, does 100 - 125psi on the other cylinders looks ok?
Old 06-25-2010, 11:25 AM
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25psi between two cylinders would signal trouble, your in for a complete rebuild. $$$
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Old 06-25-2010, 11:31 AM
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What is with the mangled oil filter, no clamps on the turbo to intercooler up pipes(or was that from removing the intercooler for the pictures?), and the messy paint over spray in the front trunk area?
The car has never had a front end alignment since the re-paint, that scares me! Why was it repainted?
Rust at the bottom of the brake vacuum booster, and more rust, and yet even more rust, etc. etc. etc.

RUN FORREST RUN!!!!!!

Mark

Last edited by full quack; 06-25-2010 at 12:24 PM..
Old 06-25-2010, 12:21 PM
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Honestly, I would say if you had a lot of previous Porsche experince then this might be a acceptable car. However, in light of all. I suggest you find a un modified car if possible. Something in good working order.

The thing with modified cars is a matter of the quality. And this cars well " in need of a lot of TLC. " Now there are exceptions to the listed above! There are vehicles tuned with notoritey that sell for a lot and those go frankly to a rather specific species and such cars come up for sale rarely.

Anyways, good luck!
Old 06-27-2010, 06:19 AM
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It doesn't look like it has been well taken care of since its "rebuild" and that fuel rail setup looks very dangerous. You would be spending 15-20K to fix that car up.
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Old 06-27-2010, 07:43 AM
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Someone spent some money building this car in the "PAST".. The EFI looks 90's so you may have to ditch the system and start over along with engine rebuild.. like many have said be ready to spend money.. Also you are rebuilding an old hot rod motor which may have hard to find parts. I would not pay over 10k since you could easy spend 10-30k in rebuild. The money is the motor in old porsche the rollers are cheap.
Old 06-27-2010, 11:33 AM
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