Cranking injector pulse width
#1
Cranking injector pulse width
I think I found a couple tables for setting cranking IPW based on coolant temp:
They are shown here with the scaling from the rom, which looks to be microseconds, so divide by 1000 to get IPW in milliseconds.
There is also a table which acts as a multiplier to these values based on throttle position:
So in the stock configuration it just disables this enrichment if you floor it, but there might be other interesting ways to set it up.
caveats
There are other checks against pedal position, throttle, ECT and unknowns, that can disable this enrichment. Also unknown is exactly under what circumstances table A or B will be used, and there are other modifiers to the final value, including some learned parameters, that I don't understand. This is all totally untested.
Almost forgot, I looked these up in some other roms for reference:
Code:
Table A Coolant Temperature [c],Cranking IPW [us] -30,123700 -25,121000 -20,112400 -10,65000 0,43300 10,34700 20,28100 30,22000 40,17500 50,14200 60,11870 70,10170 80,8135 Table B Coolant Temperature [c],Cranking IPW [us] -30,123700 -20,112400 -10,65000 0,43300 10,34700 20,28100 30,22000 40,17500 50,14200 60,11870 70,10170 80,8135
There is also a table which acts as a multiplier to these values based on throttle position:
Code:
[Throttle Position], [Multiplier] 21.02102,1 22.52252,0 100,0
caveats
There are other checks against pedal position, throttle, ECT and unknowns, that can disable this enrichment. Also unknown is exactly under what circumstances table A or B will be used, and there are other modifiers to the final value, including some learned parameters, that I don't understand. This is all totally untested.
Almost forgot, I looked these up in some other roms for reference:
Code:
Series II 2010 MT USDM -30,91230 -25,89240 -20,82895 -10,47940 0,31935 10,25590 20,20725 30,16225 40,12905 50,10475 60,8755 70,7500 80,6000 Very early JDM -30,123745 -25,121030 -20,118310 -10,103220 0,90130 10,72270 20,46835 30,35465 40,25140 50,17450 60,11870 70,10170 80,8475
#4
I've looked at that a few times, but I still think cranking dwell is set by a single parameter. Not something you'll be able to change with ProTuner as it is.
Last edited by oltmann; 02-26-2012 at 05:01 AM.
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