993 3.6 conversion into a 87 911 help

[David W]

I have a 95 993 3.6 I am installing into my 87 911 g50 (I am doing a 73 RSR backdate to it). I am very good with wiring and electronics (I used to repair TV’s and now a ME). I have looked at the factory wiring diagram on the CD, but of course it’s hard to follow. In addition I am trying to sort out the flywheel/clutch and engine mount issues. Trying not to reinvent the wheel so I am tapping into the experience of my fellow Pelican’s!
I know I can simply buy wiring harness conversions from the suppliers but I want to save the $$ of course. Plus I saw some links on conversions where the supplied harness were of poor quality (and wired incorrectly). Trying to save some time but my forum searches have come up with nothing definitive on the wiring. So, I would appreciate some help with the following:
1. Wiring: Does anyone have a concise wiring diagram of the DME/DME relay and immobilizer circuits? I plan to put in a Wong chip so the drive block won’t be an issue (I have a 124 box) (I hope). Next to the DME connections in the under seat area are several connectors in the harness that I have not sorted out (what are they/go to?). The engine harness connection to the rear electrical console looks similar to the 3.2 and may just need to have the pins changed (any help there?).
2. Flywheel. I have a new oem clutch/pp/tob setup for the 87, I assume I will need an aftermarket flywheel. Any orgianl P parts fit there? Will the starter engage my 87 clutch/new flywheel?
3. Engine mounts. I don’t like the idea of the engine hanging down with spacers. I understand that I can use my 87 engine mount if I go to a single pulley? What about using the 87 sheet metal?
I have read that the 96 varioram is too high for the parcel shelf if you don’t use the spacers. What about the 95? I have read about a process of denting the parcel shelf (necessary on the 95)?
4. Muffler. I am using the stock HE (95). I am considering using a MK. Any thoughts/alternatives?
5. Throttle hook up. I don’t like to go with a big $$ cable form a single source. Any suggestions for an 95?

I have not posted it yet, but if you have some left over 3.6 converion parts (block off plates, etc) please let me know.

Again, thanks for your help.
Regard, David

[James Brown]

Not sure if this helps but if you blow up the wiring diagram a couple thousand percent and tape it on the wall, following the flow is easer.

[Jim Dorociak]

I will answer a few of the easy questions first. The 95 993 engine is OBDI, 96 and up is OBDII and has the drive lock in the DME, plus they put out the error codes that cause immediate failure at smog stations. 1996 and up used the Varioram induction system. It is much taller. The 95 engine is the least expensive 993 engine to put in because you can use the 95 DME and simply plug a chip in to get increased HP. On the 96 and later it has to be reprogrammed to remove the immobilizer and get more hp. Jim

[burgundyben]

1. I'd say the loom is worth the money, get the Patrick one as its got the CEL wire too, the Instang G one doesnt (ask me how I know this). Loom comes with nice OEM style connectors.

2. My flywheel came with the engine but it is the Patrick one and seems fine.

3. I used the SC mount and spacers. I have sinlge pulley conversion and it fits fine.

4. Do what Jaskas did and weld tail pipes onto the 993 CAT! Yeharr!

5. I added a new arm onto the bell crank on the transmission, with a cable nipple on the end, used a Lambretta scotter gear cable shortened. Total cost about $4.

[David W]

Thanks, do you have a pic of the engine side of the cable? Great idea

I assume you needed the spacers? What year was your engine? Is the engine close to package tray?

I read in the 993 forum about a 914 with the Patrick harness that was wired incorrectly, hence my concern but thanks for the positive feedback.

[burgundyben]

Originally Posted by David W

Thanks, do you have a pic of the engine side of the cable? Great idea

I assume you needed the spacers? What year was your engine? Is the engine close to package tray?

I read in the 993 forum about a 914 with the Patrick harness that was wired incorrectly, hence my concern but thanks for the positive feedback.

Sorry, no pic of the other end, it was just a cable adjuster like found all over motorbikes and a couple of large washers. But check out Jev on impactbumpers.com post about modding a 993 cable.

Forgot to add, 3.2 tinware is miles away, use the 993 tinware.

I'd say go for the Patrick harness. Thinking more about it, do you even need that loom? Can you swap out your 3.2 loom for the 993 loom and be nearly ready to run?

I concluded on 3.6 conversions, that the lesser the age gap between car and 3.6 motor the easier it is.

Edit - thinking about it, I'm not sure you should take any notice from me, mine wont run!

[David W]

Thanks,

Clarfication please: "3. 2 engine tin is miles away" Does that mean it's too large? I heard the rear of the 993 tin is too small to fit to the "rubber engine skirt"

I wil ck out the impactbumpers.com site (never heard of it, thanks!

The 3.2 is a lot different (and simpler system).

Regards, David

[burgundyben]

I mean the tinware on the 3.2 is very different, you'd end up doing lots of cutting and welding and drilling new holes. It'd be a pig of a job i think. Usiing 993 tin is easy.

[midnight911]

3. I have 95 in an 84 and have no spacers. but then again, there is no space between idle control valve and hoses and the chassis, even mine without the insulator pad.

[cudabnu]

I put a 1 inch spacer on mine (90 3.6 in a 80) to level the engine better, and the stock 964 tin will fit, unfortunately I cut mine to use without the spacer at first, then didn't like the angle that the engine sat at (I used a modified 964 bracket)

I also used the Patrick Motorsport wiring conversion, and everything worked great.