I've been looking to buy a motor home and have found some (2013/2014) have 300 hp rating while newer models (2015) have 340 hp, but both are the Cummins 6.7L engine. Why and how does the same engines differ? Can the 300 be tuned somehow to give 340 hp?
Cummins 6.7L horsepower
- Thread starter CharlieBR
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Gary RV_Wizard
Site Team
Yes they can. Other Cummins engines have the same sort of variations. It's pretty simple to limit the horsepower with a computer-controlled engine, and they can also limit or expand the turbo boost to adjust horsepower. And later models years often boost the power further as they tweak the design. For 2015, the 6.7L goes as high as 385 hp! However, I believe in the configurations used in motorhome chassis, the choices are 300, 340 and 360 hp.
I have a Cummins ISL 8.9L that generates 370 hp, while some of its sister ISLs can do 400, and later model years of the same engine offer 425 and 450 hp.
I have a Cummins ISL 8.9L that generates 370 hp, while some of its sister ISLs can do 400, and later model years of the same engine offer 425 and 450 hp.
Gary RV_Wizard
Site Team
Usually Cummins likes to replace the engine computer to do it, even though it should be just re-programming. Pricey, though they may give a trade in for your old one. They wanted near $3000 to do my ISL. Ask a Cummins shop about it.
Ernie n Tara
Well-known member
I'd be careful about doing that. Often the heat generated by the engine is the determining factor. The radiator, fan, transmission/oil coolers, etc are designed for a given power level.
That said, I expect one of the aftermarket "tuners" would accomplish what you want.
Ernie
That said, I expect one of the aftermarket "tuners" would accomplish what you want.
Ernie
lavarock1210
Well-known member
- Joined
- Nov 7, 2010
- Posts
- 483
Be carefull about tuners. As said there is cooling requirements and most important the transmission.
Many get away with tuners in trucks. But they do not have a heavy load all the time like your motor home has.
Many get away with tuners in trucks. But they do not have a heavy load all the time like your motor home has.
