Need help with cmdfuel limiter
I've been trying to get that last bit of power out of my truck on a stock fuel system. my problem has been a commanded fuel drop past 2800 rpm. If i torque on it its fine as soon as i downshift it starts to tapper off downward to 122 cmdfuel at 3150 rpm. I've read every forum in this cummins 5.9L section and have tried a ton of different things ( one at a time of course). Here is a data Log. Frame 3600 shows it well. Any help would be awesome. Thanks
CMB_0066.efi
06 dodge 3500 5.9 Auto.
port & polish head, ARP head Studs, valve springs, colt stage 3 cam, Gillett 62 mm turbo,
ATS Manifold, cold air intake, 5" exhaust. and a Built Trany.
One possibility: In the upper RPM range it's hard to maintain 100% load which as that load tapers off will cause a drop in fueling.
2006 Ram 2500 4x4, 5.9 CTD, Laramie, QC
Fully Built 48RE, Billet Flex Plate, Triple Disc TC, 62/65 HE351cw
2017 Corvette 3LZ Z06 M7 with Z07 Package
Interesting... is there any references to load in any tables? i know i can view my calculated Load on my display in my truck. What variables create the calculated load output.
06 dodge 3500 5.9 Auto.
port & polish head, ARP head Studs, valve springs, colt stage 3 cam, Gillett 62 mm turbo,
ATS Manifold, cold air intake, 5" exhaust. and a Built Trany.
Take a look at this thread
https://forum.efilive.com/showthread...rpm-fuel-issue
2006 Ram 2500 4x4, 5.9 CTD, Laramie, QC
Fully Built 48RE, Billet Flex Plate, Triple Disc TC, 62/65 HE351cw
2017 Corvette 3LZ Z06 M7 with Z07 Package
Thanks man i have read that one over and over. ill keep digging.
06 dodge 3500 5.9 Auto.
port & polish head, ARP head Studs, valve springs, colt stage 3 cam, Gillett 62 mm turbo,
ATS Manifold, cold air intake, 5" exhaust. and a Built Trany.
What's your rail pressure at in the upper rpms? You might have to have full fueling down in the 120mm^3 range in order for it to keep full fuel at a lower rail pressure. You might also try and tweek the current conversion table a bit to keep rail up in the higher load areas. I've had a truck startpulling fuel due to rail not keeping up and was able to get full fuel by doing this.
Between 155-165 mpa. I found what was pulling my commanded fuel down it was a pid rpm limiter. Apparently even with all the pids disabled the rpm limiter in the pid section was still pulling fuel some how. I got full fuel now to about 3400 rpm but after that it starts pulling fuel slowly agian all the way up to 4200rpm. Guess I'll just keep data logging.
06 dodge 3500 5.9 Auto.
port & polish head, ARP head Studs, valve springs, colt stage 3 cam, Gillett 62 mm turbo,
ATS Manifold, cold air intake, 5" exhaust. and a Built Trany.
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