3.6 conversion guys - where have you mounted your coils?

DW SD · 02-24-2006, 08:28 AM

Just curious, anyone have pictures of where you've mounted your twin coils? I thought about the engine rear crossmember and attaching a fixture close to the firewall. Any thoughts?

Thanks very much, as always.

Doug

jevvy · 02-24-2006, 08:59 AM

Only decent pics I have of mine:

Cant take the credit for it tho - I got Steve Timmins to make it for me as part of the kit I got from him.

Only disadvantage I have noticed so far is that you have to remove the bracket to make it easier to get the engine in/out.

Are you still going 3.6 - how far on are you?

911teo · 02-24-2006, 09:10 AM

Doug

mine were mounted on the back metal rear panel of the car (part of the body structure). I'll see if I can find any pics...

DW SD · 02-24-2006, 09:12 AM

Thank you!

I have the motor on the stand and have done a tune up.

I've been reinforcing the rear chassis (suspension pickup points), cleaning up previous holes in the rear sheet metal, etc. Coming along nicely. I will spray WURTH this weekend and be ready for the color shortly thereafter.

I'll be curious to know of any other setups......
Thank you,

Doug

ischmitz · ischmitz's Garage

993 engines have their coils mounted to the rear cross-member of the engine as seen in the images above. A 964 engine has a separate coil pack that has to go to the firewall of the engine bay. I have put mine in place where the Bosch CD unit used to be. Looks almost stock with the 964 electric box. I took the entire 74 relay panel out for this.

Cheers,
Ingo

DW SD · 02-24-2006, 10:16 AM

Ingo,
Looks very clean - thanks! Question: the electronic guts inside of your 964 box, is that custom made or is that from a 964? I'm guessing the latter?

Thanks,

Doug

Bill Verburg · Bill Verburg's Garage

As Ingo said 964 are mounted on the side wall

993 on the rear x-member

DW SD · 02-24-2006, 11:39 AM

Bill,
Thank you! Do you have clearance issues with the coil packs when removing the motor (993)?

Doug

Bill Verburg · Bill Verburg's Garage

No, the whole thing including exhast is bolted together, the exception would be the heater blower if you use one

ischmitz · ischmitz's Garage

Quote:

Originally posted by DW SD
Ingo,
Looks very clean - thanks! Question: the electronic guts inside of your 964 box, is that custom made or is that from a 964? I'm guessing the latter?

The "guts" are really only a metal carrier plate from an original 964. The two connectors from the DME harness clip to that carrier plate. I also decided to put in the stock capacitor that connects to the little two-pin connector. It's not an absolute must but it helps to smooth out the spikes from the alternator and make the +13.8 volt cleaner. The 964 Motronic is known to be sensitive to any type of electrical interference. So I thought I might as well put the little bugger in while I am at it.

What motor are you having? 964 or 993. If it's a 964 the coils are considerably heavier and I don't know if mounting them in the 993 location would be smart idea. Maybe they don't like the vibration. Just a thought. Try to get a hold of the stock coil bracket and some rubber posts. They are like two studs with a piece of rubber in between. That's the correct way.

Cheers,
Ingo

jevvy · 02-24-2006, 12:36 PM

Hi Doug

I have just finnished what looks like you are just part way through. I'm happy to help you as much as I can - just give me a shout with any Q's and I will do all I can to assist.

Have you posted a thread with where you are up to - I might have missed it.

From yr other post that i have seen - the only wiring diagrams I have are in my Bentley book and are spread over several pages - if you give me specifics I will look stuff up for you.

I also have a link to a thread with a post I made with the 993 worksop manual PDF to download:

993 engine diagrams/info

good luck

911teo · 02-24-2006, 12:38 PM

I have them mounted exactly like Bill's

jevvy · 02-24-2006, 12:48 PM

I guess the difference with the 964/993 coils is that the 964 coils have the igniters mounted with them where as with my 993 conversion the SINGLE igniter is mounted under the seat with the ECU and DME - this was dictated by the loom so I would imagine that this is the same for all motors.

I had to buy an igniter for my conversion and I also ordered (on back order) the heat sink - I got my car running before the Porsche heatsink arrived using an old PC CPU heatsink.

Since it was on backorder I was committed to buy it - I was gutted when I picked it up and realised that it was just an expensive rectangle of alloy with a few holes in - my DIY heatskink looked like a better solution.

Lesson was make yr own heatsink!

MuffinMan · 02-24-2006, 12:52 PM

hmm...I think mine are close to the "bumper side" of the engine bay, to the left of the fan. I'll try to remember to take a picture this eve.

DW SD · 02-24-2006, 01:06 PM

I thank you all for your prompt responses and support!

Anyone see any reason not to mount them on the gussett between the shock towers? Will they clear the intake mainfolds?

I would make longer coil to distributor wires to custom fit the necessary length.

I have a 993 box to house the engine to chassis harness connections (similar to INGO's and Bill's).

ischmitz · ischmitz's Garage

Doug, not a good idea - you won't be able to get to them without dropping the engine. Trust me it will be pretty crowded in there once the engine is in assuming you keep the stock intake system. Also, I don't like the idea of longer primary spark wires to the dizzy. They act like a big antenna radiating one more time into all those sensor wires running to the DME. Why don't you just put them to the left sidewall?

Ingo

William Miller · 03-01-2006, 11:57 AM

Quote:

Originally posted by ischmitz I also decided to put in the stock capacitor that connects to the little two-pin connector. It's not an absolute must but it helps to smooth out the spikes from the alternator and make the +13.8 volt cleaner. The 964 Motronic is known to be sensitive to any type of electrical interference. So I thought I might as well put the little bugger in while I am at it.

Cheers,
Ingo [/B]

Can you give a little more instruction on this for those of us that are "electrically challanged".
I was lucky enough to get the box, harness, coils and brackets from the doner car.

Do you have any pictures of the DME relay connector / wiring?
Thanks.

ischmitz · ischmitz's Garage

Check here http://sswl.di.com/~ingo/schematics.htm for the adaptation of the 964 DME harness to a DME relay. You can click on the graphics to expand them. The capacitor is a 1inch diameter black cylinder with a black and a red wire lead and a connector. It plugs into the DME harness. There is matching connector right in the same area where the two main plugs (14-pin and 16-pin) come out.

William Miller · 03-01-2006, 12:43 PM

Thanks for your link again. Did you use a factory type relay connector for the DME relay or just some spade connectors?

Should the capacitor have been with the doner car?

ischmitz · ischmitz's Garage

I used a stock relay socket from a 964. It was not the DME relay but for something else. I opened the plastic base and soldered new leads to it. The capacitor should have been in the donor car. It sits behind the metal plate in the black box in the engine compartment.