Today I attempted to use Dash Command to set timing on my truck. During my set-up of the software I scrubbed the codes and had a crank shaft correlation code so I know that's needed. I deleted the code and will in the near future run the truck to relearn the code with out a scanner.
I purchased extended PIDs in the software to gain access to the cam retard functions. Nothing descriptive on the PID name is exactly what I'm looking for but it is showing timing. I've attached a few photos for reference of what I saw on the truck. When running the truck up to 1100-1200 rpm in neutral the degrees stay at 25* it does not change when rotate the distributor in either direction. I gave it a good amount of movement clock wise and counter clockwise with no change. One PID reads -25* and the other reads 25*
After clearing all the codes I took the truck out for a drive. The following degrees is what I noted:
->Idle 17-20*
->Cruise 1000-2500 rpm 25* @ part throttle up to 35% throttle
->WOT 13-17* @ 50% to 100% throttle (2800-4800 rpm pull)
Truck runs good but this whole box of worms was opened due to a occasional pop at cruise that felt like the ignition was overly advanced.
Truck is currently on a flashedblack box PCM that has the L31 file loaded *no tables changed, post cat O2 sensor and and EGR functions deleted, whipple S/C at 4.2 PSI, GM-HT383 cam, 1.6 roller rockers, forged FM pistons, walbro 450 fuel pump. Whipple piggy back computer is working and the ignition is a MSD 6AL ignition system for the vortec L31 engines.
Anybody have such ignition timing in their trucks like this? I fully expected the ignition to be more linear in changes and not just stay at 25* then jump down to 13* under hard load. Usually when tuning cars I can sweep the throttle across it's range and see the degrees of timing change linearly. Not this time.
I purchased extended PIDs in the software to gain access to the cam retard functions. Nothing descriptive on the PID name is exactly what I'm looking for but it is showing timing. I've attached a few photos for reference of what I saw on the truck. When running the truck up to 1100-1200 rpm in neutral the degrees stay at 25* it does not change when rotate the distributor in either direction. I gave it a good amount of movement clock wise and counter clockwise with no change. One PID reads -25* and the other reads 25*
After clearing all the codes I took the truck out for a drive. The following degrees is what I noted:
->Idle 17-20*
->Cruise 1000-2500 rpm 25* @ part throttle up to 35% throttle
->WOT 13-17* @ 50% to 100% throttle (2800-4800 rpm pull)
Truck runs good but this whole box of worms was opened due to a occasional pop at cruise that felt like the ignition was overly advanced.
Truck is currently on a flashedblack box PCM that has the L31 file loaded *no tables changed, post cat O2 sensor and and EGR functions deleted, whipple S/C at 4.2 PSI, GM-HT383 cam, 1.6 roller rockers, forged FM pistons, walbro 450 fuel pump. Whipple piggy back computer is working and the ignition is a MSD 6AL ignition system for the vortec L31 engines.
Anybody have such ignition timing in their trucks like this? I fully expected the ignition to be more linear in changes and not just stay at 25* then jump down to 13* under hard load. Usually when tuning cars I can sweep the throttle across it's range and see the degrees of timing change linearly. Not this time.