7secpontiac

Running a carburetor on a 01 trans am with msd 6ls ignition. I have no map sensor and seen somewhere I need to disable it.
I can't seem to find out how to disable it. I pulled all the curve out of it, I assume this should work right? Or does it need to be completely disabled. If so, how? Thanks

WE TODD DID

iTrader: (2)

If you set your timing curve to zero, that's where it needs to be.

7secpontiac

Thanks just making sure. This the only LS car we got. More into race cars so all these sensors just aren't my thing

Doug G

If using the MSD box....yes....ZERO it out, save to PC, and then save to MSD box.

74novalq4

I do NOT understand this problem. I talked to MSD and they said just disconnect the plug and it will not add any timing.

Doug G

Others have reported it adding timing when not zeroed.

74novalq4

I'M wondering how that could happen, as the computer is looking for an exact return voltage from the 5volt reference at the sensor. With it unplugged it would have no return voltage to bias any map circuits in the computer. At that point the computer would have no knowledge of any vacuum changes to add timing.

WE TODD DID

iTrader: (2)

Then leave your settings as is.

74novalq4

Thank you, that's exactly what I have done and it works great.

fast89stang

iTrader: (2)

I didnt 0 mine when I first got it built. Got to track, with no sensor on it, it was showing 45-46 degrees of timing.... YIKES. I ran it like that several passes. Lucky i didnt hurt something. It has since been 0'ed out.

Pop N Wood

iTrader: (1)

LOL

With the unit unplugged it will read 0 volts on the signal line all the time. The box will interpret that as max vacuum (zero absolute pressure) and will dial in whatever timing you have in your curve for zero pressure. So a 6010 box will add 6 degrees on top of your timing vs. RPM curve whereas a 6012 box adds 20 degrees.

Your choice, either zero out the vac curve and advance your static timing accordingly or leave the vac curve the way the box came from the factory and mentally add 6 degrees to everything.