04.5 LLY dyno questions/fuel mileage

[DarkDMAX1022]

New to the forum, my first duramax and Just Curious to see what kind of Numbers my 04.5 LLY should be showing on the dyno with exhaust, programmer and K&N drop in filter. Ran it last week and didnt seem right, also what fuel mileage LLY owners are getting with these mods, mine seems high, not complaining, just curious. anyone with any input would be awesome. Thanks..

[jlb444]

I have an '05 LLY, it's the one in my sig. Don't know what it dyno's at, but if I drive it normal on stage 2 of my progarmmer (65 h.p.) I can get 21-23 mpg. And thats checking it manually, not just going by what the computer says (cause it lies).

[DarkDMAX1022]

ok that sounds right at about what im getting on the dash display, does the computer show higher readings or lower than what your really getting?

[SDP-1]

with your 20's its most likley off a ways.? did you say you dynod it last week

[DarkDMAX1022]

Well i have 33 inch tires and adjusted tire size on the programmer so it should be ok? still not too sure. But yea it was dynod last week. It showed up 254HP and 420tq on stock settings and then the power dropped when i adjusted the programmer to the extreme (120HP) setting.

[SDP-1]

i would say the power should have went up 65hp or so.far as the speedo check it with a gps

[DarkDMAX1022]

Yea definetly i think the guy didn't know what he was doing on the dyno, does those numbers sound about right for a stock truck with exhaust and k&n filter? And will do for the speedo, didn't think of using a gps. Thanks!

[SDP-1]

sure what kind a dyno.dyno jet,or what

[DarkDMAX1022]

ya it was a dyno jet.

[SDP-1]

yea a guy ran mine on a dyno jett.started my run at 2500rpms and was done about 1000rpms later.that was with my edge evo on 100hp 450 hp and 770 torque there was a little left i thot. was kinda pissed for a $100