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NFERNOSS · 10-02-2012, 05:54 PM

Now, am I an electrical engineer? No, a 32 year GM Tech, which means I repair engineer mistakes in my employers eyes. I specialize in electrical repair and do 99% of the Corvette work here, which includes the classics (I have a '66' 427 Convertible sitting in one of my stalls as we speak).

The first piece of info is correct. There are no octane (or fuel) tables. It uses spark timing tables to adjust for the variance in octane. Seeing no spark knock from the sensors "should" allow the ECM to go back to the High Octane table.

The piece with the dyno graph. The author doesn't know what he is talking about. There is no VVT on the L99's. Only displacement on demand (DOD), which any L99 owner will attest only comes into play during certain cruising situations and coastdown for the most part. My '09' 4WD is Procharged and I have it turned off, makes no difference in fuel mileage.

The last piece which mentions the LS1. That PCM uses a completely different system. There are only two fuses, one for battery supply, the other is ignition to turn on the PCM. Here again, I owned at one time a 2004 GTO with the LS1 that was running a Maggie with meth injection and nitrous. I know the system well, as I spent many hours with my HP Tuners program messing with it. It's two octane tables were set identical so as not to go into a low performance issue (some with tunes have commented about this here already).

If you look at my schematic, the F10RA fuse supplies constant battery voltage to the ECM. The F20UA fuse is powered up by the "Ignition Run Relay" which the BCM switches on being the Power Mode Master. The F5UA fuse then gets power along with other fuses on that circuit for other items when the ECM closes a ground within itself to power up the Engine Controls Ignition Relay, this also totally powers up the ECM.

10-02-2012, 05:54 PM	#49
NFERNOSS Drives: Inferno Orange 2SS Join Date: May 2012 Location: Prairieville, LA Posts: 48	Now, am I an electrical engineer? No, a 32 year GM Tech, which means I repair engineer mistakes in my employers eyes. I specialize in electrical repair and do 99% of the Corvette work here, which includes the classics (I have a '66' 427 Convertible sitting in one of my stalls as we speak). The first piece of info is correct. There are no octane (or fuel) tables. It uses spark timing tables to adjust for the variance in octane. Seeing no spark knock from the sensors "should" allow the ECM to go back to the High Octane table. The piece with the dyno graph. The author doesn't know what he is talking about. There is no VVT on the L99's. Only displacement on demand (DOD), which any L99 owner will attest only comes into play during certain cruising situations and coastdown for the most part. My '09' 4WD is Procharged and I have it turned off, makes no difference in fuel mileage. The last piece which mentions the LS1. That PCM uses a completely different system. There are only two fuses, one for battery supply, the other is ignition to turn on the PCM. Here again, I owned at one time a 2004 GTO with the LS1 that was running a Maggie with meth injection and nitrous. I know the system well, as I spent many hours with my HP Tuners program messing with it. It's two octane tables were set identical so as not to go into a low performance issue (some with tunes have commented about this here already). If you look at my schematic, the F10RA fuse supplies constant battery voltage to the ECM. The F20UA fuse is powered up by the "Ignition Run Relay" which the BCM switches on being the Power Mode Master. The F5UA fuse then gets power along with other fuses on that circuit for other items when the ECM closes a ground within itself to power up the Engine Controls Ignition Relay, this also totally powers up the ECM.