Detuned 6.7 diesel in Ford Super C RV

[patperry2766]

I was looking online at a Super C based on the Ford F-550 chassis.

The specs on the Ford website are 330 HP/ 750 TQ, while the specs on a "non-commercial" F-350 are 440 HP & 925 TQ.

When a manufacturer detunes an engine, are there physical differences and different parts to the engine, or is it all in the software that can be altered either with a re-flash or a tuner such as Bullydog or some other brand?

[carringb]

Yes, you could easily change the tuning for more power, however keep in mind that will most definitely affect the powertrain warranty. I would not want to own a 6.7L without a warranty.

[Bedlam]

The chassis cabs are designed to run longer duty cycles at full output than the pickups. I have not seen those differences in the engine or transmission and all the tuning is done in software. You will find the chassis cab has different axles and RP ratios than the pickup to better use the detuned engine.

[Rich1961]

I've been driving a 2011 F350 6.7 PSD chassis cab at work since Dec of 2011, and now have approximately 115,000 miles on it. The F350 thru F550 chassis cabs have a different turbo, air intake, and different exhaust system than the pickups have. Detuned engine output also because of duty cycle requirements that the chassis cabs have that the pickups don't.

Rich

[Tiger02]

All the manufacturers do this with their commercial diesel engines. A lot of it has to do with reliability over many duty cycles hauling or towing near max capacity all the time. Different emissions requirements also play a part I'm sure.

I'm sure they could be reflashed with a different tune as I doubt there are any physical differences in the engine itself.

It is good to see a diesel in a class C though as an option.

[Turtle_n_Peeps]

No, they simply don't give the engine as much fuel.

The more fuel you give a diesel engine the more power you will make up to the point you burn it up, break it, or hydro lock it.

Many engine makers have the same engine make different power outputs. I think Cat's 3208 makes from low 200's to over 500 HP. Same engine, just different fuel settings.

My friend has a class 8 Volvo that he detuned to 400 HP to get better mileage. A lot of trucking company owners do this also.