ok so i just bought my first cummins and first diesel yesterday and want to do some fuel tuning .... i read up on it and saw that you can just adjust the star wheel to do some light tuning ... were is it located ... i tried to look for the allen screw but did not see it ... maybe i looking in the wrong place ... were in the engine bay is it located ?

you can do the star wheel. the mechanism it adjusts is what limits fuel at low boost. basically, it makes it smoke more, but with a little turning you may get a little better response off the low end. Before you go into it though you really need to get at least an EGT gauge.
That being said, the allen screw your looking for is about a 1" plug behind where the injector lines come off the pump.

FastCR's Sig:

1995 Chevy K2500 Extended Cab Long Box P Pump 12 Valve + NV4500 + Military 37s
215s, No fuel plate, star wheel all in, WG shut, Southbend, stacks, some other stuff
'08 LMM 6" lift, 35's, blacked out, etc. (dads)
'02 VW Jetta TDI (All stock except deck)
I got a pocket full of bread a girl givin' me in the back row at the movies

ya i have a set of gauges ... first thing i did ... wich way do you turn the star wheel to up the fuel ... towards or away from the engine

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i tweeked with the star wheel a bit and and it did help acutally alot ... noticable diferance ... is there any thing else i can do ... something about moving the plate forward ?

yes you can move the plate foward it requires the removal of the afc witch is th housing
that the star wheel is located in if you are in their you might as well grind the plate to a 100 and push it full forward and as well as the afc housing hope that helps ya

hotcummins's Sig:

its a 12valve with a few performance adders

what trans do you have? Fill out your sig with truck info and it'll help a lot.

Slide your afc housing all the back too and that will help actually add power...not just the black smoke. When i first got my truck i wanted to do everything but had no money at the time. I slid that housing and played with the star wheel. It helped a little with throttle response. Buy a plate if u can while your right there and it would be even better. Theres 4 bolts on it and one is sealed. I used a punch driver

cool thanx alot guys ... i will probably get in there this weekend ... i am running a auto trans .. how much power can the stock auto hold up ?

not much ive seen them come apart with stock power

12valvetater's Sig:

1997 2500 4x4, 260,000 mi, nv4500, EMS lockout hub conversion, EMS vacum/delete, fully rebuilt engine, o-ringed head and block, 12mm ARP headstuds, 60 lb valve springs, 4k gsk, 4in down pipe to 5in behind the wheel, air dog2 165gph, Valair organic single disk, updated 5th gear nut, pyro and boost, street/towing cam from East Coast Diesel, NO fuel plate

crap ... wat do you think is safe like 250 ? 300 ?

mylilpwny's Sig:

97 cummins 2500 auto trany
stock with tweeked star wheel and guages (trans, exhst, and boost) but more things to come ( intake exhst and plate)

95 12v 5 speed chase truck/prerunner project

turn the star wheel away from the engine for more pre boost smoke...

j_hlad's Sig:

2000 Cummins 24v, 4.5" lift, 18" MotoMetal Wheels, 35x13.50 Mickey Thompson Baja ATZ's, 7" grandrock stacks, Bushwacker pocketsyle flares, 3" cowl induction hood, westin nerf bars, CFM+ carbon fiber intake manifold, BD's Black intercooler, Edge Comp, ARP studs, O-ringed, FASS 150, SB 3850 DD clutch, 66mm Charger and a little fuel...

Really depends how you drive it. Not sure how many miles it has but with performance mods the tranny is on borrowed time.

Dr. Evil's Sig:

DIESEL BOMBERS LEAD ADMINISTRATOR

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98 12V quad cab 4X4 AND 2001 24V quad cab 4X4

tune your afc correctly and you'll save on the trans abunch too if you have a tendancy to horse the throttle around. it delays full power for afew seconds; but once your rolling it isnt near as much strain as a dead stop at WOT

tower_ofpower's Sig:

One thing i learned in college: DON'T!!! stick your fingers where you wouldn't stick Mr. Happy 89' W250, full fuel 1 1/2 turns, smoke screw needs adjustment, M&H M3 fuel pin and timing spacer, 366 spring, air dog 150,3" DP to 4" DP back bully dog exhaust with the front baffle cut out. Soon to be:transmission upgade, turbo and manifold swap, and injectors.

put a good valve body and converter, and input shaft and flexplate in the tranny she will hold up alot better. also look into the torque converter lock up switch as a search on here its another cheap and easy mod that makes a big diffrence

96blackcloud's Sig:

[SIZE="1"]96 CTD, NV4500 Swap, Ceramic Valair Single, MBRP 4in to 5in straight pipe, AFE stage 2 filter,box,torque tube, modified p-7100, boost elbow, silencer ring MIA, Primelock fuel filter relocate, coolant filter, upgraded hogden electric clutch fan, 3 gauge pillar, boost,egt,tranny, 3in suspension lift w/ 33/12.5/16 hancook M/Ts, 2003 fx4 6.0- stock built 47re 4sale, lowstall converter,vbody,billet deep pan, shift kit.

thanks guys