stevieturbo

I tried a search, but couldnt find any info.

Im doing an install using an LS1, with an aftermarket ecu, but I need to know what the 4 wires are going to each coil ??

I can assume one is a +12v, one a -ve trigger, and one a chassis ground.

What is the 4th wire for ??

Cheers, Stevie

P Mack

iTrader: (6)

From Corvette fuel injection, the four wires are:
Ignition positive voltage - pink
Ignition Control Signal - light blue, purple, dark green, or red depending on which coil
Reference low - brown
Ground - black

Not sure what reference low is but i'd assume it is the difference between ignition control signal and reference low that fires the coil, not just the ignition control signal itself. I'm just guessing so feel free to correct me if i'm wrong.

stevieturbo

Thanks...

Any idea what Id connect it into then, or if its even required ? Obviously my ecu only has the normal trigger mechanism to fire the coil which is one wire per coil.

P Mack

iTrader: (6)

What kind of aftermarket ecu are you using? Like fast or something? If so i'd just try and find someone else who's using it and see what they did.

P Mack

iTrader: (6)

Although I found this sweet schematic of the ignition system. Looking at this leads me to believe you should hook the "reference low" wires (brown) up to a common ground at the ecu. Normally that would be pin 60 and 61 but you don't have those i guess.

stevieturbo

Its a DTA P8Pro. I had been using it on my previous Rover V8 twin turbo.
www.dtafast.co.uk

So, Id say Im probably one of the first to do it here.

patSS/00

iTrader: (6)

I agree that's pcm/ecu ground. The pcm ground is actually connected to the chassis ground, but with a direct connection there's less chance of voltage spikes etc. than if the current had to use a path thru the block or whatever. Your aftermarket ecu must have a ground connection, just use that.