6.2 ip pump adjustment help??

[n8r67]

ok guys heres what I got:
I am runnng a military 6.2 with a 6.5 turbo setup. running the 6.5 Injectors and ele lift pump. I*have turned the "fuel screw" the 1/6 turn and advanced the timing approx 1/16" using marks. now that I have advanced the timing the truck runs very strong from 0-1/4 throttle. runs good at 1/2 throttle then it seems to drop off the more throttle you apply. it does not die or run bad just doesnt seem to "accelerate" as well after 1/2 pedal. I do notice the egts climb quickly after 1/2 throttle so I assume its not a lack of fuel?? my reading leads me to believe its something with the transfer pump pressure at the ip inlet but cant find much info on it. 2nd guess would maybe say internal advance?? anyone got experience with this??
thanks in advance
nate

[Corts60]

That is the exact characteristics of the DB2 injection pump in my experience. Pretty much never any reason to give her more than half throttle because your only wasting fuel and sending your EGT's through the roof with no more power produced. It is just the nature of the beast. But, do you have a boost gauge? Are you sure that your turbo is functioning as it should?

[n8r67]

well I guess thats better than an issue with my pump??I am running a boost guage and a manual (spring operated) waste gate. it pops open at around 10-13psi and holds at 9-10psi all the way thru the throttle/rpm range

are the 6.5 mechanical pumps any better with this??

[Corts60]

I'm not sure. I know the 6.5 had electronic versions that were even worse as far as reliability, but not sure about the behavior as far as power is concerned.