3bar Posted November 16, 2019 Share Posted November 16, 2019 Hi, new to PCMTec and I am used to a parameter "injector duty cycle %" or similiar used in other ecus and if you go past 80% your injectors are typically open 100% of the time (deadtime included) in PCMtec i have found inj pulsewidth and typical values are 0.44 to 0.53 under WOT so i am looking for an equivalent in PCMTec I dont want to assume that that means 44% and 53% injector duty cycle and hence I have lots of headroom available - so please can you point me in the right direction to determine if i am good with injectors or maxxed out ? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 17, 2019 Share Posted November 17, 2019 From memory I don't think the PCM actually calculates duty cycle. Most other packages would just have a math formula to guesstimate the duty cycle. Pulse width is the width of the injector pulse in microseconds, 0.44 microseconds doesn't sound right. You can calculate your duty cycle from your pulse width fairly easily. Basically you work out the duration of a revolution at your given rpm, this gives you a window and you can divide it by your injector on time. There are calculators if you google it. Personally I find pulse width more interesting as it is comparable across the rpm. Eg 100% duty cycle at 6000 rpm would be far lower at 3000 rpm. Peak torque almost always correlates with peak pulse width as well which makes for and interesting graph. Quote Link to comment Share on other sites More sharing options...
rfh Posted June 14, 2022 Share Posted June 14, 2022 Hey Roland On pulsewidth, I am finding the logs to be displaying very large numbers. As can be seen here.. Maybe the wrong time divisor in this parameter? bf wagon std Cheers Rob Quote Link to comment Share on other sites More sharing options...
Kirby@PCMTec Posted June 14, 2022 Share Posted June 14, 2022 On 11/16/2019 at 1:42 PM, 3bar said: Hi, new to PCMTec and I am used to a parameter "injector duty cycle %" or similiar used in other ecus and if you go past 80% your injectors are typically open 100% of the time (deadtime included) in PCMtec i have found inj pulsewidth and typical values are 0.44 to 0.53 under WOT so i am looking for an equivalent in PCMTec I dont want to assume that that means 44% and 53% injector duty cycle and hence I have lots of headroom available - so please can you point me in the right direction to determine if i am good with injectors or maxxed out ? MID42591 is injector duty expressed as an absolute value (0.0>1.0) you can convert it to a percent, by disconnecting your session (press vehicle), then you can change the units from absolute to %, then reconnect to the car (press vehicle button again). Also have a look at MID42654, this will tell you if the PCM is commanding the injectors above 100% and you are clipping. Quote Link to comment Share on other sites More sharing options...
Kirby@PCMTec Posted June 14, 2022 Share Posted June 14, 2022 4 hours ago, rfh said: Hey Roland On pulsewidth, I am finding the logs to be displaying very large numbers. As can be seen here.. Maybe the wrong time divisor in this parameter? bf wagon std Cheers Rob That is interesting. From memory MID36175 is in us not ms, so I think the value you are seeing there *might* be out by a factor of x1000. Could be an equation issue.... can you please go Help > Upload files to support > Upload editor log files to support from a logging session that is looking at this channel. Can you compare this value to MID36178 (Bank1 Injector Pulse width) and send me another screenshot to support@pcmtec.com? 1 Quote Link to comment Share on other sites More sharing options...
rfh Posted June 14, 2022 Share Posted June 14, 2022 Kirby, Editor log sent Quote Link to comment Share on other sites More sharing options...
rfh Posted June 14, 2022 Share Posted June 14, 2022 Also MID36178 reads 0 ms under all running conditions Cheers Rob Quote Link to comment Share on other sites More sharing options...
rfh Posted June 14, 2022 Share Posted June 14, 2022 Effectively 0ms min 0 max .01 Quote Link to comment Share on other sites More sharing options...
Kirby@PCMTec Posted June 14, 2022 Share Posted June 14, 2022 Just now, rfh said: Effectively 0ms min 0 max .01 Hi Rob. I have responded to your support ticket, but I need the editor logfiles, not the datalog files. If you could please send them via the help menu. Thanks Quote Link to comment Share on other sites More sharing options...
rfh Posted June 14, 2022 Share Posted June 14, 2022 Editor log sent again Quote Link to comment Share on other sites More sharing options...
rfh Posted June 15, 2022 Share Posted June 15, 2022 Found in Editor log Quote Link to comment Share on other sites More sharing options...
Kirby@PCMTec Posted June 15, 2022 Share Posted June 15, 2022 13 minutes ago, rfh said: Found in Editor log yep saw this in your uploaded log, oddity...but its being fixed now. Thanks for bringing it to our attention. 1 Quote Link to comment Share on other sites More sharing options...
engineermike Posted January 24 Share Posted January 24 Does anyone have an idea how to log injector pulsewidth and max pulsewidth in a gen3 coyote? None of the mid numbers mentioned above show up in the logger. Quote Link to comment Share on other sites More sharing options...
engineermike Posted January 25 Share Posted January 25 Nevermind I figued it out. It's MID42954 for the for injector pulsewidth and MID71830 for the max pulswidth. So just divide to get duty cycle. Quote Link to comment Share on other sites More sharing options...
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