Doing the math on that map shows that the PCM-commanded injector pulse width exceeded the IDM's capability severely under high load/RPM situations. This thing would fart and pop terribly with any decent amount accelerator input at high RPM.
8 ms is very excessive, even with low injection pressures. However, unless something is wrong with the truck, you won't be at 100 MFD and 435 PSI of HPO. Interestingly, the IDM is capable of supplying up to 19.22 ms at 750 RPM. You certainly couldn't run that much and have a driveable truck though. Conversely, the IDM is capable of running only 3.7 ms at 3350 RPM without having issues. Another thing to keep in mind is that unless you have your MFD vs. Boost map allowing 100 anywhere, you really won't get 100 MFD commanded anyway and that last tune I showed you has 100 across the board.
__________________
Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
|
Fri, April 2nd, 2010, 08:11 PM
Threaded Mode