Engine/Transmission (1998.5 - 2002) lowering power curve

[cu1160]

Hi Everyone,



Have a 2002 ram 3500 dually 4x4 with a gear vendors, 5 inch exhaust, and a quadzilla adrenaline (1000) series. This was all in hopes of increasing my MPG.



Question is when I'm cruising at 72mph @ 1500rpm (double overdrive) my egt's seem to rise dramatically when im using the gear vendors. I havent really noticed much improvement in mpg, but it sure is more quiet and more pleasant in the cab.



Is there a way to lower the power curve from 1500rpm's to about 1300rpms. I was hoping to get the mighty cummins sweet spot down a couple hundred rpms?



thanks,

cu1160

 

[SnoKing]

Sweet spot is at 2K for 24V. Maybe a Smarty. What transmission do you have, if it is an auto you line pressure to the TC is really low at lower RPMs? Sounds like you are below the point of spooling the Turbo correctly. If you have a 6sp with a HX35 Turbo, you might try a HY35 on it. Someone should have one in their garage.



Chris

 

[fox]

Aftermarket camshaft should help with your truck.

 

[BDaugherty]

The reason that you see higher EGTs at lower cruising RPMs is that you are not getting as much air through the engine. I would try the cam swap first. Although I haven't done it, I've heard that some of the major benefits are better MPG, powerband that starts sooner and lasts longer, and faster turbo spoolup. All of those would help your situation.

 

[ThrottleJockey]

It would be easier to try SNOKING's suggestion first. With that crazy transmission, a little LESS exhaust housing would result in a bit more air. The stock exhaust housing is 12 cm2 and the HY-35 is a 9 cm2. The tighter housing would create more of a restriction and more actual charger rpms and more air.



Welcome to the TDR.

 

[cu1160]

Thanks for the suggestions everyone. Time to start a christmas list.

 

[Bob4x4]

It is very hard on the engine to load it at 1300rpm... ... . not a good idea.

When towing at low rpm with added power you will also increase the risk of breaking the transfer case. I had a customer who towed in double od at low rpm broke so many parts it made him quit the towing biz. The fuel mileage will not go up if you are running under a load at super low rpm

 

[cArNiVaLwOrKeR]

1950 Maybe?



cArNiVaLwOrKeR