Power train diff in 09 to 10

[dward]

Are there any differences in the engine and trans from the 09 3rd gen to the 4th gen trucks?

Does the 09 have the exhaust brake?

Thanks

 

[Powder Extreme]

Probably subtle programming differences and such, but the 09, 10, 11 all have the same functionality, HP / TQ ratings and yes, the 09 has the exhaust brake.

 

[dward]

Thanks for the info. I'm sure the 4th gen is a much nicer truck, but I think the 3rd gen body style looks better.

 

[rscurtis]

I think the 4th generation is a nice looking truck. I prefer the 3rd gen. instrument cluster, as it's laid out better and the ancillary guages are larger and easier to read. The only feature of the newer trucks I'd like to have in my '03 is the 68RFE and the quieter cab- the rest of it you can keep, particularly the $50K+ price tag.

 

[HBarlow]

No Cummins ISB6. 7 engine has an "exhaust brake" but all of them have a feature that provides exhaust braking. The variable geometry turbocharger provides the same identical function as an exhaust brake by closing the nozzle to block exhaust discharge.

 

[BSeyler]

The 6. 7 page on the Cummins website states, "Now in a Ram Heavy Duty truck, an integrated exhaust brake is available direct from the factory. Utilizing the 6. 7L Cummins Turbo Diesel engine's turbocharger, the exhaust brake significantly improves control when towing heavy applications, such as pulling RV fifth wheels and horse trailers, providing added vehicle control and vehicle brake savings by transforming horsepower into braking power. " Cummins calls it an exhaust brake. Call it what you want if you own it, I guess.

 

[Powder Extreme]

Lol. Its not an exhaust brake if you think like the old style tthat would block the exhaust flow with a flapper valve. But it still blocks the exhaust flow by closing the vanes on the exhaust side of the turbo. Same principle, exhaust flow is restricted. Added benefit is since the turbo spools up, it creates pressure just like under load which creates more exhaust thus creating more restriction.

I would imagine Cummins calls it an exhaust brake for two reasons.
1. It is all accomplished using exhaust from the engine.
2. They don't want to confuse it with a jake brake that mounts on the cylinder head and changes the valve opening and closing.

 

[HBarlow]

The turbocharger used in the Cummins ISB6. 7 does not close "vanes" for exhaust braking, it closes a nozzle.

 

[Powder Extreme]

But it's still an exhaust brake.