@CadillacKid - feel free to chime in here.
I am looking to enable 6th on an early 2006 model Allison 2500 (I -might- have to put new valves in) through PCM Performance but I noticed that still, even with 6th, the rear end is kinda high @ 6.17.
cruising at 65, the RPM in 5thOD and 6thOD would be 2375/2050 respectively. That only provides me a little room to pass as the limiter is set to about 2550RPM.
Main reason is milage, not speed. I'm happy cruising at 65, but would like to pass someone who is doing 62.5 (happens often).
So... I am looking for (google search didn't turn up what I'm looking for) the HP/Torque dyno charts for the 2006 DT466E 220HP engine. Along with that, since the torque is made at about 1400RPM and HP is about 2400RPM, what's the recommended RPM for cruise?
I want enough as to not lug the engine, while providing enough extra RPM to quickly accelerate and pass that slug - all while increasing MPG.
So I guess I am looking for a few things:
- Dyno Charts
- Recommended Cruise RPM to maximize MPG while not lugging the engine
- Lowest gearing as to not affect starts (lots of stop and starts in windy mountain roads in Latin America for this Skoolie)
- What's required to remove the RPM limiter on this beast?