Histogram Help - MAF vs Dynamic Air

[Screamn03]

I want to log MAF in g/sec and compare it to Dynamic Air in g/sec. I've been messing with the histogram this morning and can't get it display anything.

I'm thinking I should be able to get something similar to the default MAF histogram that's labeled 'MAF - LTFT' but instead of logging LTFT it'll show dynamic air in g/sec and instead of the x axis being Hz it'd be in g/sec. Can this be done?

[Bill@HPTuners]

cant see why not post up a log.

[Bill@HPTuners]

it would be something like this but you'd need a custom calculation PID

[Screamn03]

Hey thanks Bill, I actually sort of confused myself after I posted this thread, had to re-ask myself what exactly it is I'm trying to accomplish, but the example you posted helped me out with a crash course in how histograms work.

I ended up doing something like this:
http://www.hptuners.com/forum/showthread.php?t=7100
...which ended up being a custom PID of [PID.16]-[PID.2320] which I used with a Primary_VE_vs_RPM_vs_MAP table, this gave me the difference between the MAF and Dynamic Air in lbs/min.

It was interesting to watch, under slow throttle transitions I could see MAF and Dynamic Air match pretty closely, but if I moved the throttle too fast they would vary. Upon further investigation it looks as if the VE table is off which I verified by loading a 1barSD tune, disabling the LTFTs, and watching the STFTs. I had previously tried to get the VE dialed in but this is a 00TA so just using the secondary VE table and then trying to copy over to the primary didn't work out so well.

[Bill@HPTuners]

so do you need help with the custom pid/histogram any further or are you cool?

[Screamn03]

so do you need help with the custom pid/histogram any further or are you cool?

I'm good to go, thanks!