Engine/Transmission (1998.5 - 2002) What rpms are you getting hp and torque peaks.

[RonA]

I would like to know what rpm some are seeing peak torque and peak hp.

Ron

 

[Hohn]

My peak tq was at 2K rpm (918lb-ft) and peak HP was 2700 rpm (390hp).



If you look at the dynojet sheet, it basically a big hump peaking at 2000rpm. It rises quickly (almost vertically) from 1200 to 2K, but tapers off after that, reaching peak hp at 2700.



Then again, I'm running the stock turbo on the edge of its performance. At 32psi of boost, I'm sure I have way over 60psi of back pressure. It's just not well-matched. I'm looking for more air.



Hope this helps.



jlh

 

[Sticks]

2200 for the tq and 2350 for the HP

 

[RustyJC]

762 lb-ft @ 2280 RPM

347 BHP @ 2600 RPM



I didn't start this particular pull until 1800 RPM (my bad ), so there may be more torque hiding down low than these figures show.



Rusty

 

[RonA]

Do the 12 valve motors put out their peak numbers at a lower rpm?

Ron

 

[Hohn]

I think the 12V generally have more bottom end. THe problem with the 24V engines is that the Dodge ECM has a torque-limiting function in it. This is something Dodge made Cummins put in the software to keep the rest of the driveline (primarily auto trannies) from shredding.



I'm not sure if the EZ gets rid of the TLC-- torque limiting calibration. The 24V dyno sheets I have seen almost never shown a tq peak lower than 1900 rpm, so I'd say that the TLC might be there still.

 

[jaybigboy34]

Peak HP at 2500 Peak TQ at 2500