slow at high rpms

[guesswho512]

everyone knows the CTD is quick, but in my pursuit of quickness i have noticed that when i get to ~2600rpm there isn't a lot left.... i would thank that my fuel rate is dropping, but i have an airdog 150.my truck is completly stock except for the dog and a "boost elbow". i have a 1999 2wd 2500 5speed.is it just me or is this normal for the cummins?thx for the helpbryan

[cummins2k]

Mine is the same way. If you look at the dyno graphs after about 2600rpm the torque curve drops dramatically. Its perfectly normal. http://dodgeram.org/tech/dsl/Facts/98ISBspecs.html If you want to wake it up in this range your going to need more fuel and more air.

[Mopar1973Man]

Actually you need to more the governor forward to 4K to defeat the curve. Redline box, Edge Drag Comp, Quadzilla Adrenaline, etc have ability to move the governor red line. But typically the Cummins 24V starts de-fueling at roughly 2,700 all the way to 3,200 RPM redline.

[guesswho512]

i see... i thought that 24 valves kept the torque high in high rpms.is it because i'm hitting 21psi boost?does the edge comp do it, or just drag comp?do you have to "splice" the wire to "turn off" defuel?

[flagmanruss]

This is good to know... so this is all electronic controlled if any box can alter it. Russ

[Mopar1973Man]

i see... i thought that 24 valves kept the torque high in high rpms.

is it because i'm hitting 21psi boost?

does the edge comp do it, or just drag comp?

do you have to "splice" the wire to "turn off" defuel?

Yes you must tap the wire...

Edge Comp fuels with normal de-fueling (2,700 RPM)

Edge Drag Comp fuels all the way to 3,200 RPM (redline).

Edge Juice (Hot) will act just like Edge Drag Comp

Adrenaline I'm not sure of... I'm pretty sure there is a setting/program to all it.

I think the Smarty does it too.

BD Has a box too...

http://www.dieselperformance.com/index. ... /index/43P

[dorkweed]

The 3rd gens will fuel all the way to redline before defueling. I've held my truck at about 96-100mph; which is about 28-2900rpm........then stick her to the floor, and she goes until 3200rpm or about 110mph. At least in my truck!!! :thumbsup You're loosing the torque in the 2nd gens above about 2800rpm.....that's why it seems to be doggish.