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Old 01-20-2019, 09:18 PM   #1
Skoolie
 
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Join Date: Aug 2018
Location: Santa Rosa, CA
Posts: 204
Year: 2007
Coachwork: ICCORP
Chassis: CE300
Engine: DT466
Rated Cap: 16
DT466 Torque & HP Dyno Charts

@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?
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Old 01-20-2019, 09:34 PM   #2
Skoolie
 
Join Date: Feb 2016
Location: Indianapolis, IN
Posts: 154
Year: 1999
Coachwork: AmTran
Chassis: International FE
Engine: DT466E
Rated Cap: 84 passengers
You are correct, those are pretty tall gears. I believe I have read various reports that recommend driving within 10-15% of peak torque of your engine. I'll see if I can back that up with any written evidence. But that likely won't be realistic for your bus currently. 1550-1600 rpms you'd be running much slower than you'd prefer.
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Old 01-21-2019, 05:51 AM   #3
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Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 17,246
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
Quote:
Originally Posted by Pizote View Post
@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?
1900 -2200 is good crusising rpm for a DT.

I've had highway gearing on most my buses. Its great.

WHy would you remove the rev limiter?
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