I got the dealer to let me take an 04 f-350 overnight b/c they have no stock anymore due to the big sales so i found one similarly equipped but it has no power until like 2k then it pulls hard....is there something wrong?

 

Wonder if they got some bad fuel, so it could have plugged fuel filter???

 

nope, thats the nature of a turbo diesel. that small (relatively) 6.0 liter engine isnt much without the help of forced induction. it wont produce much power at all until boost arrives at the intake manifold. you may ask why it takes so long on the stock 6.0 to produce power? mainly, it is stock programming. once you get an aftermarket program loaded, it cuts down on most of the "lag". another contributing factor is the "dead pedal". when the engine is happily sitting at idle, and you mash the throttle, it doesnt do anything for maybe 1.5-2 seconds. that is because the throttle is electronically controlled, not by a cable. it takes that long for the sensor to tell the injectors "hey dump some fuel in, this guy wants to go". once the engine starts speeding up, the exhaust gases start to pass through the turbo charger. the expansion of the gases inside the shroud and then the force of the gases passing out of the turbo spin the wheel, causing air to be compressed on the intake side. then the compressed air has to travel through 4' of pipe, (crimped very restrictively on some) and then through a huge intercooler, and then back through 3' of more piping. once this air gets to the intake, then you start feeling the power. by that time the engine has managed to speed up to 1500-1750 rpms. very intricate system, indeed. i just simplified it so it would be easier to understand.

 

ya i know all about the diesels and compressor wheel operating characteristics but man....it even has a 4" or more (haven't measured) performance exhaust. I pulled over on the highway and had to get back on and i nailed it....waited as the truck crept forward a bit, then right around 1800 or so rpms BAM...there was boatloads of power and the truck shifted smooth as smooth gets and the transmission ratios kept the truck in it's powerband perfect. Going it's not bad, but from a dead stop...better watch out....cause it ain't goin nowhere for a bit. If I powerbrake it and build up boost it might take off better, but that makes the TQ converter heat up quick. Otherwise I just might not know how to drive a diesel...lol...but even still...it seems a bit on the lagging side, that is until it's off idle...then watch out...

 

that is the reason the guy who pulled out in front of me thought he had enough time to get out of the way, to broke to pay attention i guess, the turbo lag let him get to the optimum point so that all i could do was to hit him behind the cab and save his life, then it kicked in and dragged us all over the place, eeehaw.

 

The turbo lag seems to be less when you slowly press the go pedal rather than stab it while at a dead stop. I believe the engineers programmed them this way to keep from damaging the trannies or rear ends (or rear tires).

 

hmmm but that is still odd though that you have to roll into the pedal though....The 05 f-250 i drove wasn't like that though as much....

 

would it be that easing into the throttle allows the computer time to monitor inputs and react accordingly? or is this just another attempt to breed common sense out of us?

 

Edge module with Atitude sensor, AFE Air and 4" Magnaflow fix that. Little harder on rear tires though.

 

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Could be the EGR. I know there was an issue with them sticking open. I have an 03 and had that problem. The truck would not spool up until it downshifted (this was while pulling a trailer). Even when I went over a freeway overpass, it would have to downshift. I took care of it and disconnected the EGR. No problems now.

 

I agree with the discussion, most of it. My '05 F-250 CC 4X4 PSD has significantly less turbo lag if the throttle is rolled on, vice stomped on. I have also disabled the EGR, quite some time ago, so that is not the issue. What actually occurs I have know idea. The 'seat of the pants' meter tells me there is definitley a difference though.