EFI guys please stand up...

[David]

Here's the latest pic I have (it's not as pretty with wires and hoses everywhere ):




Here's how I laid out the M600 wiring although I don't have about 1/4 of the stuff actually wired like the wheel sensors and cockpit switches:

[gsmith660]

Looks very nice. Did you make your own billet brackets?

[Raceboy]

The silicone insulated wires that I used don't crack with heat & cold cycles and I have the harness made from it in my turbocharged 924 for 4 years, no hardening of the wires, nothing. Withstands contact with exhaust without melting etc.

There is always numerous ways of doing things but 1200 for harness materials is clearly overkill for a hobby racecar. There is just no point in claiming the most expensive way is the only way. Question is: what is the goal? And follow the requirements to achieve it, be it with your wallet or your brain (or both).

[David]

Originally Posted by gsmith660

Looks very nice. Did you make your own billet brackets?

Yes. I'm not a machinist (well maybe an amateur machinist), but I work in a machine shop so I have access to the machines.

[drb930]

Originally Posted by David

If you're really good at wiring you could do it yourself. I'm above average at wiring, I built the harness myself, and I wish I paid Motec to build it.

I spent about $1200 in material to build the harness for my M600. I checked, double checked, and triple checked and I still made a couple of mistakes. I could have saved myself a lot of heart burn by shelling out the extra money for them to build it.

I put a bulk head connector at the fire wall to make pulling the engine easier. Even though I used very good DT gold plated connectors, I wonder if it doesn't add unnecessary risk for a bad connection.

I have a lot of aviation avionics installs, do you think that will qualify?

Thanks for the input,
Dave

[David]

Originally Posted by drb930

I have a lot of aviation avionics installs, do you think that will qualify?

Thanks for the input,
Dave

You'll probably do much better than I did

My biggest issue was ground wire connections in the harness. I crimped them together using standard unisulated butt connectors and heat shrunk them. For some reason I got a few bad readings when checking the harness and had to open it back up and fiddle with the connections. I don't know what I would do different, but hopefully a good wiring guy would do better.

If I did it again I would use better heat shrink tubing. I used pretty good stuff, but I'd spring for Aero quality stuff next time. Especially since there are good Tee's and other shape shrink tubing from Aero suppliers.

I was glad I used good DTM connectors even though they're more expensive and require a $300 crimping tool, they are a much more positive connection than Weatherpack or others.

[TimT]

I use "expandable mesh sleeving" for the bulk of the harnesses I make, only using heat shrink at the terminus of each circuit...

Sleeving

And Weatherpac connectors.. mil spec connectors are cool.. and better than the Weatherpac if a customer wants mil spec thats what we build... If he want to get a harness that works just as well and costs much less than the mil spec... Weatherpac..

I can't find pics of the whole harness I built for my car, but here is the expandable sleeving, and the bulkhead connector

[930gt-40r]

Tim- you use Ballenger Motorsport?

[TimT]

We probably buy from the people that supply Ballenger

Had not seen that site before