Ok Guys,
This takes the cake. I have a twin 300 HPDI rig with my port motor doing the lost rpm suffle. That is, I plane out with both motors syc'ed up to lets say 3200 rpms, in 15 to 20 secs after everything stabilizes my port motor will drop, 200 rpms and about 1 to 2 minutes later it slowly comes back to syc. With that said, I have monitored both medium pressure and HP during this event (ie medium press 50 psi, HP 986 psi). Additionally, all variables monitored using YDS (ie TPS, Spark, Fuel PW, temps, etc..) remain constant except for of coarse the fuel PW; it goes up ever so slightly with the rpm drop (that is expected given the load appears to be increasing for no reason). This has been happening for about 2 yrs and now and I have finally decided to fix it but I'm at a lost. One more detail, the motor will not achive max rpm, hence the concern.
Somethings I've done: swapped entire VST assembly with good motor (no change), swapped HP pump with good motor (no change), swapped entire coil and spark plug wire assem with good motor (no change)....any ideas anyone? Oh, and good motor remains running good. Compression is good and even, no codes. Any help appreciated. I even swapped fuel line just incase and still no change.
This takes the cake. I have a twin 300 HPDI rig with my port motor doing the lost rpm suffle. That is, I plane out with both motors syc'ed up to lets say 3200 rpms, in 15 to 20 secs after everything stabilizes my port motor will drop, 200 rpms and about 1 to 2 minutes later it slowly comes back to syc. With that said, I have monitored both medium pressure and HP during this event (ie medium press 50 psi, HP 986 psi). Additionally, all variables monitored using YDS (ie TPS, Spark, Fuel PW, temps, etc..) remain constant except for of coarse the fuel PW; it goes up ever so slightly with the rpm drop (that is expected given the load appears to be increasing for no reason). This has been happening for about 2 yrs and now and I have finally decided to fix it but I'm at a lost. One more detail, the motor will not achive max rpm, hence the concern.
Somethings I've done: swapped entire VST assembly with good motor (no change), swapped HP pump with good motor (no change), swapped entire coil and spark plug wire assem with good motor (no change)....any ideas anyone? Oh, and good motor remains running good. Compression is good and even, no codes. Any help appreciated. I even swapped fuel line just incase and still no change.
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