lack of power

[housecrusher]

i have two roll offs they lack big time in power one is a 03 and the other is 04 they both have a 400 in them there fuel hogs also and they are sluges i have a 99 r model dumptruck that smokes them when th dumptruck has 25 ton load and the rolloffs have 10 tons on them what can i do to get more power

[rsb502]

I had an 04 Granite with the AI 427 it was a TURD with a capitol T when I go it too , I went to Mack and complained they tinkered with the ECM, went back Irate it was worse they tinkered again, when I went back the third time I talked to the guys that send the reflash for the ECM from PA on the phone with the service advisor here in Nashville.I am pretty sure you can think of what I said long story short I said they could have teh TURD and I was Buying a KW that afternoon, amazingly when I left 2 hours later the truck black smoked and ran like a raped ape. I know a few Mack mechanics here locally and from what I have learned Mack can make the trucks run but they have to be leaned on to do so, the local dealers cant play with the calibration it is emailed to them from PA and flashed to your specific ECM but when they get it right you can make a AI 427 run with a CAT 475, I can vouch for that. I know the AI engines which should be in your 04 if not both have some pretty crazy emissions controls on them to keep them under the EPA Nox standards but thats it its all in the ECM calibration I say go back and ask for help tell them the guys with CAT engines are laughing at you most of the time they will help.

[Mackpro]

Yes exactly what 85superdog said. Both ECMs need to be updated (step 12B program). Fuel pressure tested and boost pressure tested under a load to make sure they are in specs. Also what trans, gears and tire size? Any tires bigger that 22.5 low pros and you better have 4.42 or 4.64 rear gears. When you have the AI engine, the rest of the truck has to be set up just right or you will have low power complaints.

[Lmackattack]

There was a program that really made the electronics rub good but the epa put the axe to it. Last I heard was it was almost impossible to get..

[rsb502]

I know that my truck was an 04 Granite with the AI-427 a Mack 310M trans and 4:64 rears with 11R24.5 tires and it would outpull my buddy's 2004 KW W-900 with a Cat C-15 475/500, 8LL and 4:30 rears on the same tires. Like I said it took some complaining but they can make it run

[Mack Doctor Jr.]

Ya the 03 427 my grandpa had was converted to a 460 with a fan change and a computer upgrade that they said u can no longer get. They said it was an off road computer upgrade. Im here to tell ya that thing got 38 pounds of boost and ran like a big dog. Im sure u can still get that upgrade with some persuading.

[TOMD]

i have a turbo and injector combo that will fix problem i can give you customers phone numbers if you want to talk ot some one that allready done really need extra power here in western Pa.