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#1
Wed, March 31st, 2010, 01:53 PM
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Quote:
 The screenshot Dave put up has the X axis (0-100) as Mass Fuel Desired (basically determined by accelerator pedal position). The Y axis (2.6-21) is Injection control pressure in Megapascals. The Z axis (0-5) is base pulse width in milliseconds. For pressure reference, 1 MPa is 145 PSI.
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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. 
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#2
Wed, March 31st, 2010, 04:20 PM
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OK. I'm getting it now. MFD is TPS input, based on how the pedal is scaled? And 21 MPa is 3045psi?
OK. If that's right... I'm somewhat confused again... On your 3D fuel injection PW table, it looks like ICP is going down as throttle input and PW is going up? Is that right?
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#3
Wed, March 31st, 2010, 05:37 PM
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Quote:
Here are a couple nondescript scenarios that get to the same point..... If the ICP is raised from 1400 PSI to 2500 PSI, the actual commanded pulse width HAS to decrease to maintain the same MFD. This is because a higher ICP is going to cause an injection of more fuel at higher pressures for a given pulse width. If the Mass Fuel Desired is raised with a constant ICP, then the pulse width HAS to increase. It is not possible to inject more fuel while keeping a constant ICP unless the injector is commanded to squirt more fuel. Don't get hung up on thinking that Mass Fuel Desired is another term for accelerator pedal position...... The MFD map is based on accelerator pedal position and RPM. This is enough to make a guy crazy sometimes!! 
__________________
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.
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#4
Fri, April 2nd, 2010, 03:20 PM
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After looking at the tables longer, and thinking about it more... I realize.........
I'm more confused than ever....  
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#5
Fri, April 2nd, 2010, 03:32 PM
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Going "up" in that direction happens when RPM/Pedal position increases, but in reality I don't think things really move in that direction.
The 3D graphs are a little confusing........look at it again in the 2D and it should be a little more clear. Cody, should be along to elaborate a bit. 
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#6
Fri, April 2nd, 2010, 05:24 PM
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Hey now.
The purple arrow direction is achieved by commanding higher PW at lower injection pressure. It hasn't got a whole lot of anything to do with RPM (except if you're looking at the MFD......but even that can be high at a low RPM or low at a high RPM; it all depends on load). More to come...WITH PICS!!
__________________
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.
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#7
Fri, April 2nd, 2010, 05:49 PM
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Here you go. Bonus points (gameroom cash) to the winner! Here's a hint: You will HAVE to look at two other maps to come to a conclusion. Oh, and this is at operating temp (no interference by the pulse width multiplier map). And since you can't get an exact number just from the maps, I'll take a certain range within a tenth.
__________________
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.
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