Just wondering why the common rail cummins, didn't do as well as the Dmax at the Scheid Diesel Pulls. I am happy that it did not, but was just wondering what is holding them back.

Could be lack of development time since it's newer than the Duramax.

The same turbos can be used as the older Cummins and the injector nozzles can be enlarged just like the Duramax.

Possibly because there are a lot of "cheaper" old Cummins trucks out there to modify. If your in the Cummins camp, why modify your "brand new" $40K truck for questionable results when you can pick up an older model for $15K that already has proven parts developed for it. Just a thought,,,,,

Possibly because there are a lot of "cheaper" old Cummins trucks out there to modify. If your in the Cummins camp, why modify your "brand new" $40K truck for questionable results when you can pick up an older model for $15K that already has proven parts developed for it. Just a thought,,,,,





Probably right on though

It just looks as though the cummins would have the best of both worlds. It is common rail like the Dmax so stacked boxes should be great. And you can still put the hard parts on it like the older Cummins, correcthttp://www.dieselplace.com/forum/smileys/Confused.gif?

The new Dodge common rails I see are mostly in the 400 - 460 range with stock turbo. It is small. With twins, Johnner's made great power. I want to see the common rail with a variable on it. I think it will make an awesome ride. Edge will have their box out for it soon and my guess, things can only get better.


The Duramax takes electronics better then anything I have seen though.

The real reason is when they went to common rail the also redesigned the engine for emmisions. Now they're having heat issues and turbo issues with the upgrades. It'll take some time to work through those problems. Power isn't a problem... self destruction is.

Hoot


You left out 6 speed tranny's and rear ends


Genohttp://www.dieselplace.com/forum/smileys/Hug.gif

I'm sorry geno... fill us in

Friend of mine blew his turbo up on his new dodge and he only had a mild level programmer on it.

a TST box turned up too high will take out the stock turbo on the common rail cummins every time

Part of the programming changes for these motors are mapping for boost. Too much boost and huffing the turbo will get it everytime. That is why when I dyno a new CR Cummins, I let it defuel and ease out of the throttle.

a TST box turned up too high will take out the stock turbo on the common rail cummins every time





NO IT WONT!

a TST box turned up too high will take out the stock turbo on the common rail cummins every time





NO IT WONT!





I wouldn't go so far as to say every time, but I've seen it happen twice on one '04 here and six times on six other Dodge's around here. All of them ran it a couple times on the high setting, but I have yet to see one run it that didn't eventually loose the turbo...

Part of the programming changes for these motors are mapping for boost.


That might change soon.

a TST box turned up too high will take out the stock turbo on the common rail cummins ALMOST every time

a TST box turned up too high will take out the stock turbo on the common rail cummins ALMOST every time

Yea that's right Mike. The TST box has 10 levels of hp/tq. It cannot be used much over level 5 on a stock engine. The turbo is small so it can spool really fast for it to help keep soot levels down at lugging rpms.

The TST is a very HOT “analog timing/duration" box. It was designed to give you a lot of choices including race levels that are too high for a stock engine. Unfortunately the shaft in the turbo can't handle the sudden spool and barking produced when at the higher levels, not to mention the heat. There are some who do not head the warning.

If you notice, one of the biggest mods on Cummins since the beginning is bigger turbos. That will continue. Turbos run around $800 to $1500. They are pretty easy to do yourself if you are a tinkerer.

So if anyone want s to throw a negative at the Cummins CR than it would be... "Must upgrade the turbo for real performance"... but that always has been the case.

Accessability.... sure makes things easy... Cummins... KISS

This shot is just with the hood up, nothing removed.
http://home.comcast.net/~hoot74/dodge/turbomod/images/DSCN5034.jpgEdited by: hoot

If I had that truck hoot I would have a new tranny, turbo, and tst box in it the first week http://www.dieselplace.com/forum/smileys/HiHi.gif . There's no doubt the Cummins engine is the easiest to work on. Plug and play ease has made the Duramax an engine that most don't need or want to work on though. Have you got any upgrade plans for the new truck hoot?

Right now I'm staying in warranty as I gain confidence.

I'm sorry geno... fill us in


I posted this before Hoot but here goes again. Good friend of mine hase the new Common rail H/O cummins and has had numerious problems with Diff and slack in the trans. Ring and pinnion been replaced 2 times and they say trans slack is normal. As it stands Dodge has left it in the factorys hands and they are doing nothing. Lawyer has been hired, truck is setting with less than 5k. He is driving his old 5 speed and says the new one will set till all is settled. He gonna win cause it is obvious about the diff. You cant here the engine for the howl at 45 to 55 mph and un hook drive shaft and it turns clost to a half a turn in 6th gear.


Genohttp://www.dieselplace.com/forum/smileys/Hug.gif

Don't the Dodge/Cummins trucks have the same rear end as ours? (1150 AAM) So I wouldn't think that would be just a Dodge problem. The only difference I see is that the Dodges have axle tubes that are the full 4" diameter, where ours taper down a little right outside the housing. I'm not sure why. But, I would guess that they have the exact same internal parts. I think I have heard of some of the ones in the GM trucks having the ring & pinion replaced, as well.

Yes Dodge is also using AAM.
GMs axles are spec'd with less capacity because of the tubes tapering. Must be a cost saver.

Internals if you have anti-spin are different. Dodge has a Torsen type unit instead of an Eaton Gov-lok.

Geno yes... there were a few axle problems early on but they seem to have subsided. Just like the GM HD when it came out... launch shudder, some problematic Allisons... things that you get during a first year or so introduction of an all new design.

Mountain GoatsEdited by: hoot