leadfoot4

iTrader: (1)

Anybody happen to know what the ignition timing should be for an LT-1 engine? I recently bought an Actron scanner that reads "live" data. Last night, I had some free time, and threw it on the car.

Initially, the timing figure read -50 degrees, while in closed loop. As the car warmed up, it went to -20 at idle and -40 as I drove under light throttle. As I accelerated, it went back to -45.

For the record, I have an LT-4 knock module in the PCM, but I left the OE LT-1 knock sensor in the block.

Any thoughts?


(thinking the reader might be wacked, I put it on my wife's car, and it showed timing numbers in "positive" numbers)

MEAN LT1

iTrader: (2)

What kind of timing are you talking about?. Initial timing?,wot timing?, part throttle timing?.

leadfoot4

iTrader: (1)

I mean the timing that the PCM is showing to the ADLD port, that the scanner is reading. It's -45 at idle, and varies between -45 and -25 as I drive the car, based on acceleration and/or load.

Bird_Of_Prey

iTrader: (1)

That is TOTALLY normal. All that matters is timing under WOT. Everything else is just setup for fuel efficiency and driveablity.

BlackScreaminMachine

iTrader: (17)

if you had a laptop, id just get datamaster, I trust their readings alot more then Actron