Brando5641

iTrader: (3)

I got a 89 turd gen we are putting a ls1 into and i need to know how long the harness needs to be from measuring the back of the pass side head to the ecu to mount under the dash.

Friggy

iTrader: (1)

...Personally I am not sure, I am in the beginning stages of my swap. You might be able to find what you need on here...

If I were you, I might check the engine swap section on thirdgen.org. There is a wealth of knowledge specific to LSx swaps for third gens.

Brando5641

iTrader: (3)

I went with 4'. I think it will be way to long but its better then too short.

Pocket

iTrader: (22)

4' is pretty long, but you'll have to cut a hole in the firewall to get it to fit. To go the stock route behind the fender, it needs to be 7.5' long, measured from the RR corner of the fuel rail

Brando5641

iTrader: (3)

What size did that hole need to be above the frame rail for the ecu plugs? I cant find that write up on that. Did you use some cut vacume line for a grommet?

found the thread but i dont see what size the hole needs to be... i herd 2" in there but no one was certain.

http://www.thirdgen.org/techboard/lt...ing-under.html

gMAG

iTrader: (1)

The trick is getting the connectors through the hole.
There was an existing 1 7/8" diam hole in the firewall. I elongated the bottom, then squared the bottom into a cathedral, so that from side to side is 1 7/8, and top to bottom is 2 1/2".
My harness was reworked by a sponsor. In bending the harness carefully to make it pass through, I managed to break one wire going to the crank sensor. Maybe the wire was broken to begin with.



Whatever the standard harness length is, there was enough to either mount as seen here, or under the dash in a 1st Gen Camaro.
Some drill a hole lower, where the bottom of the heater box would be, to keep the harness out of sight. Since the hole was already there, I decided that invisible was not an issue.
Everything will be dressed up later. Probably two pieces of sheet metal (upper & lower) over the hole.

Pocket

iTrader: (22)

I cut a 2" hole for mine and its a perfect fit with the grommet. The grommet is some 3/8" fuel line split long ways

The best way to prevent breaking a wire in the bends is to think about where the bends will go before building the harness and move splices to the strait parts

Brando5641

iTrader: (3)

Can this be done without pullin the ac box? I would rather cut my arm up doin it with the engine in as to have ta pull that box.

Pocket

iTrader: (22)

With extreme difficulty

Why bother since the box is rather easy to remove, 4-5 10mms on top, plus some 9/32" screws on the top. Slide the drier out and get the last hidden 10mm, then 3 more 10mms from inside the cabin. Out it comes