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VetteVet · 02-20-2012

Tyler,

I have done the secondary delete. Are you running all 16 injectors at idle? I was under the impression that pulse widths got too short at idle to fire all 16 injectors reliably enough for smooth idle.

Also, I'm not sure that the 411 injector drivers could handle the current required to drive two injectors per driver, which could mean an add-on driver circuit to handle the exra current.

I think that the mods could be made to the 411 code, the hard part is getting the code hacked. I've started disassembling it, but it's a lot more complex than the P4 code.

One interesting note: the Motorola 68332 processor has table lookup instructions as part of the instruction set. Instead of having to execute a routine for lookups, it just takes a couple of instructions to load the registers and then execute the lookup instruction.

The 411 PCM code has adaptive octane control with high and low octane spark maps with interpolation between the two. The PCM basically maintains an effective octane rating variable that is used for the interpolation between the two tables. It also has shift light control that can be set independently for each gear. All of the tables extend up to 8000 RPM. It also uses an adaptive idle strategy, although I'm still trying to figure out exactly what that is.

The really cool thing is that the code is divided into segments. My understanding so far is that segments can be mixed and matched and features can be turned on and off. If you want air pump functionality, click the mouse and you have it. If you don't, click the mouse and that code is not executed. If you're using electronic throttle, click and it's turned on in the code. Cable throttle? Click and those routines are made active and the electronic throttle routines are disabled. The alternator excitation can be controlled by the PCM if you enable it. The alternator is de-excited at WOT to make the extra power available.

I've just started digging into the 411 PCM, but so far I'm pretty impressed.

02-20-2012	#16
VetteVet Join Date: Jan 2009 Location: Mandeville, LA Posts: 340	Re: Ignition Impulse @ Balancer/Dampner Tyler, I have done the secondary delete. Are you running all 16 injectors at idle? I was under the impression that pulse widths got too short at idle to fire all 16 injectors reliably enough for smooth idle. Also, I'm not sure that the 411 injector drivers could handle the current required to drive two injectors per driver, which could mean an add-on driver circuit to handle the exra current. I think that the mods could be made to the 411 code, the hard part is getting the code hacked. I've started disassembling it, but it's a lot more complex than the P4 code. One interesting note: the Motorola 68332 processor has table lookup instructions as part of the instruction set. Instead of having to execute a routine for lookups, it just takes a couple of instructions to load the registers and then execute the lookup instruction. The 411 PCM code has adaptive octane control with high and low octane spark maps with interpolation between the two. The PCM basically maintains an effective octane rating variable that is used for the interpolation between the two tables. It also has shift light control that can be set independently for each gear. All of the tables extend up to 8000 RPM. It also uses an adaptive idle strategy, although I'm still trying to figure out exactly what that is. The really cool thing is that the code is divided into segments. My understanding so far is that segments can be mixed and matched and features can be turned on and off. If you want air pump functionality, click the mouse and you have it. If you don't, click the mouse and that code is not executed. If you're using electronic throttle, click and it's turned on in the code. Cable throttle? Click and those routines are made active and the electronic throttle routines are disabled. The alternator excitation can be controlled by the PCM if you enable it. The alternator is de-excited at WOT to make the extra power available. I've just started digging into the 411 PCM, but so far I'm pretty impressed.