EngTrqRef

jpowel29

jpowel29

Member
Feb 1, 2008
780
0
16
Bentonville, Arkansas
I am back on stock injectors temporarily. Attached is a snapshot of data of spool up while on the foot brake. I feel that I should see more that 389ft/lbs on EngTrqRef. Truck leaves soft - Thoughts?

Throttle - 30.6%
rpm - 2425
Calc Fuel Flow - 51mm3
Main Pulse - 804us
Main Inj Timing - 8.4deg
Rail Pressure - 22.7k psi
MAF - 22.66lbs/min (2.2v)
 
JoshH

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,713
773
113
Texas!!!
Just remember that torque reference is only a reference number not an actual torque output value. The ECM looks at B1102 to determine how much fuel it needs to achieve the "torque" requested by the throttle position. The ECM then uses the fuel quantity and RPM to determine fuel pressure, timing, and boost, and it uses fuel quantity and fuel pressure to determine pulse width.

How much boost pressure are you building before you leave the line?
 
jpowel29

jpowel29

Member
Feb 1, 2008
780
0
16
Bentonville, Arkansas
going to dial up b1115 a little starting at 20% throttle and see what happens. I sold my mechanical gauges and didn't watch map but it was starting to build pretty good. I need a little more fuel to start to see the 60' times drop.
 
JoshH

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,713
773
113
Texas!!!
You may want to play with B0795 a little bit too. The engine is fuel limited based on the MAF. That table will allow it to fuel harder with less air. Lower numbers give more fuel.
 
JoshH

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,713
773
113
Texas!!!
beach_33 said:
Is not possible to over fuel during spool up in reference to the maf table. I believe this to be happening to my truck
Click to expand...

Yes it is, but if you are already up on the turbo pretty good, then there isn't much chance of choking it out.
 
You must log in or register to reply here.
Top Bottom