PSI Conversion - Lateral-g Forums

**Swain** · #1 08-09-2015, 10:23 AM

I have a PSI conversion wire harness in my 68 Camaro with a T56 trans.
Engine LS3
Do u need to have the brake switch hooked up? I cannot get the car to fire, and the guy who wired the car didn't hook up the brake switch. Any ideas?

XLexusTech · #2 08-09-2015, 10:34 AM

Quote:

Originally Posted by Swain

I have a PSI conversion wire harness in my 68 Camaro with a T56 trans.
Engine LS3
Do u need to have the brake switch hooked up? I cannot get the car to fire, and the guy who wired the car didn't hook up the brake switch. Any ideas?

Not only do you need it hooked up but you need a modern switch... Car won't crank without brake petal depressed

http://www.psiconversion.com/tech_ar...STRUCTIONS.pdf

**Swain** · #3 08-09-2015, 11:10 AM

Thank you I figured it needed to be wired.

Keep you posted

dhutton · #4 08-09-2015, 12:49 PM

I thought the TCC (Torque Converter Clutch) signal was only needed with the auto trans. At least that was the case with the LS1 builds I did.

Is the car cranking? Is there provision for a clutch safety switch in the harness?

A lot of guys make the mistake of connecting the ECM power to the power that is not hot when cranking. It needs to be connected to power that is hot both when cranking and running.

Don

**Swain** · #5 08-09-2015, 04:22 PM

Put a new cam sensor in still not fire.

**andrewb70** · #6 08-09-2015, 04:51 PM

Quote:

Originally Posted by dhutton

....
A lot of guys make the mistake of connecting the ECM power to the power that is not hot when cranking. It needs to be connected to power that is hot both when cranking and running.

Don

^^^This...

Andrew

gerno · #7 08-09-2015, 06:01 PM

I used PSI and had a firing issue too due to the tune and VATS. I had to add a wire to the harness and put it to constant ground. I forget exactly which one it was but will see if I can find it tonight.

You can and google it to come up with the wire, that's how I figured it out.

cpd004 · #8 08-09-2015, 06:38 PM

Do you have fuel at the rail?

**Swain** · #9 08-09-2015, 06:44 PM

Yes fuel at rails. I did notice the power dropped from 12v to 9.8V when cranking so I'm charging the battery. Maybe the ignition switch could be bad also. Trying to figure this out.

cpd004 · #10 08-09-2015, 06:47 PM

When cranking, do you have spark?