2500 5.7 less HP than 1500?

[cliffslocal]

Why does the 5.7 in the 2500 have less HP than the 1500?
thanks

 

[Galion]

Different tuning to increase engine life in the different application. Since a 3/4 ton is expected to be hauling more than a 1/2 ton truck, they detune them slightly to protect the engine from being overworked.

 

[brandonjansen]

^^ exactly. I believe they're turned to have a flatter torque curve as well to keep more torque throughout the RPM range. Peak horsepower isn't the only thing to be looking at on a dyno sheet.

 

[cliffslocal]

Different tuning to increase engine life in the different application. Since a 3/4 ton is expected to be hauling more than a 1/2 ton truck, they detune them slightly to protect the engine from being overworked.

Thanks

 

[Csanders1992]

Peak hp is for the track. Higher average hp is what you want for hauling


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[Rlaf75]

The HP may be lower but the TQ should be slightly higher. Like already mentioned it's because of towing/hauling capacities

 

[TestPilot57]

For a while I've been thinking someone should come up with a "usable power indicator".

It would essentially total up the area under the HP curve within the highest total spread of the average gear change.

The complicated part would be that the RPM spread grows as you go up, so there would have to be some fancy formulas to get it "right".

Another way to do it, that would give an overall "driveability" kind of indicator, might be to total the area under the Mid X% of the RPM range, maybe 50%. So on an engine with a 6000 RPM redline it would look at 1500-4500.

The first method would give an idea of the absolute highest ability of that engine/tranny while the second would be more of a "how it feels driving around".