Wire harness thru firewall ideas ??

[ohcbird]

Expect a nice shock if you step up to true AMP, Cannon, Siemens, Deutsch, Beru or Souraiu plugs. I'm using a Deutsch bulkhead fitting that is designed for vehicle power systems (the heavy-load pins Frank was talking about). Real easy to build- no special tools required (just patience).

When I did the engine swap in my 93 4 Runner, I used a factory harness from a later Tundra- easy day. Looks like it came with it. It's insulated / isolated from hell & 'double' waterproof.

[Rybar]

I drilled a 2" hole in the firewall to be able to fit the factory PCM connectors through. Then used a large grommet found at a wrecker. Here's a pic (this was done after the motor was installed, hence the higher location)

[rich-allen]

Originally Posted by eville

I have plans to do something like the bottom center pic in this link.
http://www.wiresandpliers.com/harnesses.html

Steve, that's a Cannon Mil-Spec plug. I don't think you can buy those plugs through wires and pliers any longer, the owner Mike Brown was killed earlier this year in a car accident. I have a couple of connections for getting those plugs if you need.

let me know,

Rich

[bigtyme1]

where is everybody putting ther PCM?

[XcYZ]

I'm mounting my ECM above the tunnel. I made a plate/bracket with studs and welded it in the car before it went to paint.

[bigtyme1]

Originally Posted by XcYZ

I'm mounting my ECM above the tunnel. I made a plate/bracket with studs and welded it in the car before it went to paint.

Scott, I'm assumeing you mean under the dash above the tunner. That's wah I was thinking about last night. Are you using the factory ECM? If you have any picks that would be great.

[XcYZ]

Yep, inside the car. It's a combination bracket that I made that mounts the ECM and the Vintage Air Compaq heater core that's welded right to the backside of the firewall. I added a couple of extra studs that I can use for good grounds for other stuff under the dash. It always seems finding good, solid grounds under the dash can be a pain.

I didn't take any pics of it though.

[Bowtieracing]

Originally Posted by bigtyme1

Scott, I'm assumeing you mean under the dash above the tunner. That's wah I was thinking about last night. Are you using the factory ECM? If you have any picks that would be great.

Yes i would like to see allso

[HWYSTR455]

The 10/12GA wires are for ECU power, correct? Those don't need to run through the firewall with all the others. I have two posts that are under the dash on the driver's side, one that's full-time/batt power, the other is key-on that's triggered through a relay.

One thing to keep in mind is that there are several wires that need to be signal & noise isolated, and the connector needs to be shielded. Using a low-quality connector will produce troubles that are hard to track down. Believe me.

You can split the injector harness from the sensor harness as suggested by using two connectors, which would allow further distance from other wires to provide more isolation.

I'm always interested in ANY source for these bulkhead connectors, so all can post, I'll keep it handy.

The problem with using the harnesses as delivered from most 'kit' EFi people is that the hole needs to be massive to pass the connectors through. You can pull some of the connectors' pins out and pass just the wire, then put it back together, but that can lead to boogered pins, and difficulties pulling it back through. Me, I refuse to cut a hole that big in a classic musclecar. Against my grain!

[Garage Dog 65]

As an aircraft avionics guy and a broadcast engineer - I'd echo the 2 connector solution. I am working on this question from another thread in this forum - so maybe we should solve this for everyone and post the results here - or in the How To section? (I haven't gotten that far in my project - so I had not started the research - but I was going down the same path)

Recommended Scenario: 2 connector solution with Mil Spec bulk head connectors and shielded sensor wiring. Plug 1 should be all the power and servo drive connections. Plug 2 should be the sensor connections with shielded wiring.

I'd be glad to do the legwork to build a solution and post some material sources if you'd like (I'm going there anyway - glad to share). If someone can tell me the scope of what you need.

Ex:

What is the max project requirement ? GM stock ECM config - or something like a FAST, Bigstuff, etc. Do you see the need for additional capacity ? If I build this for the max need you'd have additional capability if you don't need it today. Etc.

Here's one of my current vendors on connectors:

http://www.wingselectrosales.com/connectors.html

Here's one from the other thread:

http://www.newark.com/jsp/content/pr...=single&page=8

PS, RyBar - beautiful install sir !!