Logging injector duty cycle with E38?

[Redline Motorsports]

This seems like this issue has been hanging out there for a while. Why can't we log injector duty cycle with the E38?

I made a pid that takes ms and back calculates it but I am not sure if it is accurate.

Am I missing something?

Howard

[GMPX]

I'm sure Paul already added this in to a recent release.

Cheers,
Ross

[Redline Motorsports]

Which release? 66?

I spent 20 minutes on the dyno yesterday searching for one and couldn't find it. Can someone direct me to it or confirm its existence?

Howard

[redhardsupra]

isnt it better to calculate it yourself? it doesn't eat up your bandwidth this way. I have a bunch of pids i calculate myself so i can cram more other, useful stuff without losing resolution.

[Redline Motorsports]

I did create a pid but I am not sure if its correct. Based upon a 6000 rpm limit and injector can fire 20 ms at max. If I divided the actual ms into 20 and multiple by 100 it should give me duty cycle but what happens over 6000 rpms?

Thats where I am off.

Howard

[redhardsupra]

convert RPM to Rotations per second (RPS=RPM/60, thus 6000RPM=100RPS)

you need to know a slightly different entity tho: how long does it take to make a rotation, so 1/100RPS= 0.01sec or 10msec. however the fueling cycle lasts 2 revolutions, so it's 20msec

so you can do it for any other rpm:
8000RPM=125RPS
1/125RPS=0.008sec or 8msec
two revs per cycle= 8msec*2=16msec

[Redline Motorsports]

convert RPM to Rotations per second (RPS=RPM/60, thus 6000RPM=100RPS)

you need to know a slightly different entity tho: how long does it take to make a rotation, so 1/100RPS= 0.01sec or 10msec. however the fueling cycle lasts 2 revolutions, so it's 20msec

so you can do it for any other rpm:
8000RPM=125RPS
1/125RPS=0.008sec or 8msec
two revs per cycle= 8msec*2=16msec

OK...........do you have a calc pid expression you can post?

Thanks

Howard

[Redline Motorsports]

RHS,

DO you have a calc pid for this?

Howard