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Just looking for some direction from someone experienced on the correct way to go about tuning a fixed vane turbocharger on a modern common rail diesel. I am very proficient at tuning VGTs for power & making them clean. Seems I struggle with non VGT because I just don't do any but a friend wants me to tune his truck. I have a Mustang chassis dyno if it would help. The truck is basically a turd and will surge at a steady load. I know it is lacking fuel but really unsure of the "correct way" to achieve this.
1. Factory Injector pulse width table - modify or leave stock? Assuming if this is correct to modify I would focus on lower RPMs to lite the turbocharger unlike VGT where the focus is mainly in high load/RPM sections
2. Lambda smoke limit - set a fixed value 1.000 and then trim to make the truck clean in certain locations?
THANK YOU for the HELP
JZ,
The pulsewidth table and the lambda table are two sides of a similar coin. I usually advocate modifying only the lambda table if you're relatively sure your pulsewidth table is accurate. I make this recommendation because modifying adding duration to the pulsewidth table will artificially depress your fuel pressure, timing, and pilot commands. Where you used to need 50mm3 to cruise/trailer, you now only need 40mm3 - think about you timing and FP number delta between those two fuel rates. Changing lambda does not have this effect.
Nick
