Compression Ignition Addict
Join Date: Apr 2016
Location: Auburn WA
Thanked 58 Times in 58 Posts
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The MFD map above is a table I have been tweaking on my personal truck. The MFD map is completly adjustable and any PCM should be able to be tuned for fuel Cutout. There may be variances how things work as the processors and such had changed. However a professional tuner should be able to answer that better as I have never messed with the MFD map in those areas that effect 0 fueling. I only adjust the top of the map where pedal input is 50% or higher. So yes it is normal for the injectors to cutoff above a certain speed and when pedal position is at idle.
Also I can not personally compare the calibration files you listed as I only have definition files for my OBS pcm family. Purchasing all the known definition files cost a bit of money and is unnecessary unless you are tuning on a professional level.
Also how the Cutout happens I am still unsure of. If you cross reference 0.00 MFD to the PW map you will typically see low numbers around 0.50 MS. In fact my calibration has 0.42MS at every intersect of 0.000MFD on the PW table. Below a certain PW I believe the IDM will not even fire but I am uncertain how that works I do believe it has to do with the FSCS signal from the PCM to the IDM. That would take more investigation and an Oscilloscope to confirm those finding or possibly high speed data logging from the J3 port which as far as I have searched is not for sale to the general public.
97 4x4 Eaton supercharged 7.3, S369sxe R&D IDI performance T4 mount, my B350/200s, my tuning, honey badger SR hpop, Valair Ceramic single, BMW M3 bucket seats, SKY 5" RSK/Skyjacker TTB , SKY RFK & shackles, Toyo M/T
Waiting on installation: more fuel system parts
1948 GMC 4-53T Detroit, 1945 Chevy rat rod dually 4-51 Detroit, project mean green 8V53 Detroit, 1951 Mack A51T
Last edited by SuperchargedPSD; 05-19-2017 at 03:54 PM.