2007 5.9
August 25th, 2011, 01:48 PM
Got a customers truck that is doing some strange stuff.
I sent him a tune a few days ago, and he liked it very much. Notice that overall rail pressure is low...ask him how low, 16,000psi low.
Strange...and when he lets off after a hard run...it spikes to 26K.
So I ask him for a log of this condition...compare the log to the tune...as soon as he hits the throttle the duration (FPD) maxes at 180MPA and never leaves.
Screenshot of uS and Rp at 850rpm.
11779
11780
11781
As you can clearly see the FPD in the pw table is maxed out but commanded fp is not...what gives??
Also he has a log of FPC down to 12.9mA...thats WAY too low...corresponding Duty cycle is 0% which should be 24%.
Anybody have thoughts as to why??
Here is a shot of the DC% and mA...
11782
And now what the commanded DC% is...
11783
~Les
I sent him a tune a few days ago, and he liked it very much. Notice that overall rail pressure is low...ask him how low, 16,000psi low.
Strange...and when he lets off after a hard run...it spikes to 26K.
So I ask him for a log of this condition...compare the log to the tune...as soon as he hits the throttle the duration (FPD) maxes at 180MPA and never leaves.
Screenshot of uS and Rp at 850rpm.
11779
11780
11781
As you can clearly see the FPD in the pw table is maxed out but commanded fp is not...what gives??
Also he has a log of FPC down to 12.9mA...thats WAY too low...corresponding Duty cycle is 0% which should be 24%.
Anybody have thoughts as to why??
Here is a shot of the DC% and mA...
11782
And now what the commanded DC% is...
11783
~Les