need help tuning pump

cummin not strokin3 · 10-14-2009, 12:39 AM

so i installed my 0 plate and the truck has insanely horrible bottom end. it hits really hard at about 2300 rpm i have the plate about 3/4 of the way forward and my star wheel is about 2 turns from the spring being loose. the whole blowing black smoke thing was cool for a while but its getting old and now i just want power. another strange thing the truck does is when start out in a high gear and the truck almost stalls it will blow a huge thick cloud of grayish black smoke and it doesn't stop till about 2400 rpm or till i let off. its so thick that the whole street disappears

__________________
1997 dodge 2500 no plate 4" str8 pipe ,AFE BHAF,BD intercooler boots, boost and pyro gauges,what silencer ring? 2009 dodge 2500 6.7 stock as he!!

jknowles4 · 10-14-2009, 09:50 AM

Tighten up the starwheel and back out the pre-boost screw. Mine did the same thing as you describe. Was pretty cool when I first got the truck then it started to get embarrassing. Most people think that a truck smoking means it is a piece. Read up on pump tuning here and compD. I have it set pretty good right now, very little smoke and pulls great down low. I am having trouble with the topend now. Think I need to adjust timing!

Last edited by jknowles4 : 10-14-2009 at 02:39 PM.

YOUNG GUNS15 · 10-14-2009, 10:32 AM

i did a 2 houre tuning session on the highway and turned my starwheel way back and i actually gained alot of speed

__________________
94' cummins 12 valve. lots of fuel and a crazy ___ year old

SPECIAL THANKS TO TOXIC DIESEL

mathews8pt · 10-14-2009, 10:42 AM

Where is the AFC housing set? Have you flipped the washers in the housing?

__________________
2000 QCSB with a p-pump, typically broke and always stealing $$ from me

ohiocoalrollers.com

cummin not strokin3 · 10-14-2009, 02:34 PM

what does flipping the washers mean

__________________
1997 dodge 2500 no plate 4" str8 pipe ,AFE BHAF,BD intercooler boots, boost and pyro gauges,what silencer ring? 2009 dodge 2500 6.7 stock as he!!

Cowboy_Customs · 10-15-2009, 10:31 AM

Quote:

Originally Posted by cummin not strokin3

what does flipping the washers mean

x2 havent heard of this. But I dont have a working AFC either.......

__________________
'95 3500 SLT Laramie clubcab 4x4 bolt action flatbed Pacbrake 60# springs timed and tuned 4.10LS 19.5's and 309K on the clock!

http://community.webshots.com/user/Cowboy_Customs

hoodstack96 · 10-15-2009, 10:52 AM

Quote:

so i installed my 0 plate and the truck has insanely horrible bottom end. it hits really hard at about 2300 rpm i have the plate about 3/4 of the way forward and my star wheel is about 2 turns from the spring being loose. the whole blowing black smoke thing was cool for a while but its getting old and now i just want power. another strange thing the truck does is when start out in a high gear and the truck almost stalls it will blow a huge thick cloud of grayish black smoke and it doesn't stop till about 2400 rpm or till i let off. its so thick that the whole street disappears

Sounds like the arm is getting hung up under the plate. If she doesnt start to come alive till 2400? And is a real dog down low, I would pull the afc and see where the arm contacts the plate

__________________
1996 2500 4x4, Externally Gated HX35+HT60,#10, 3000 GSK, 18*, DDP 191's,5x.012's, Modified AFC,5" Hood Stack, Home Made Traction Bars,Autometer Ultra Lite II Gauges,Auto to Manual,Valair 12 1/4" 3800# Ceramic, 3.54:1 Gears.

hoodstack96 · 10-15-2009, 11:04 AM

Quote:

what does flipping the washers mean

You take the back cover off your afc and there is two washers sandwiching the afc diaphragm. One has a lip the ther doesnt. If you reverse these washers, you get full travel of the afc lever, some people also grind the angle of the afc foot off and make it flat, in order to achieve full travel.

__________________
1996 2500 4x4, Externally Gated HX35+HT60,#10, 3000 GSK, 18*, DDP 191's,5x.012's, Modified AFC,5" Hood Stack, Home Made Traction Bars,Autometer Ultra Lite II Gauges,Auto to Manual,Valair 12 1/4" 3800# Ceramic, 3.54:1 Gears.

YOUNG GUNS15 · 10-15-2009, 02:09 PM

Quote:

Originally Posted by hoodstack96

You take the back cover off your afc and there is two washers sandwiching the afc diaphragm. One has a lip the ther doesnt. If you reverse these washers, you get full travel of the afc lever, some people also grind the angle of the afc foot off and make it flat, in order to achieve full travel.

ive done both these and i dont smoke too much...

__________________
94' cummins 12 valve. lots of fuel and a crazy ___ year old

SPECIAL THANKS TO TOXIC DIESEL

DTanklage · 10-15-2009, 02:20 PM

Quote:

Originally Posted by hoodstack96

...some people also grind the angle of the afc foot off and make it flat, in order to achieve full travel.

that has got to be the worst way to get full rack

bout the only thing i could think of that is worse would be to gut the afc

take it apart...study it....figure out how it works....and modify accordingly

or take it to someone that knows whats up and pay them to mod it

the afc is the brain for your fuel curve

gutting the afc for a street driven truck is about as smart as removing your brain

(the one between your ears)_

hoodstack96 · 10-15-2009, 02:27 PM

Just info gathered from others on the site. Just thought I would make it easier for others, since most cant grasp the concept of the search feature this site has

__________________
1996 2500 4x4, Externally Gated HX35+HT60,#10, 3000 GSK, 18*, DDP 191's,5x.012's, Modified AFC,5" Hood Stack, Home Made Traction Bars,Autometer Ultra Lite II Gauges,Auto to Manual,Valair 12 1/4" 3800# Ceramic, 3.54:1 Gears.

YOUNG GUNS15 · 10-15-2009, 03:26 PM

Quote:

Originally Posted by DTanklage

that has got to be the worst way to get full rack

bout the only thing i could think of that is worse would be to gut the afc

take it apart...study it....figure out how it works....and modify accordingly

or take it to someone that knows whats up and pay them to mod it

the afc is the brain for your fuel curve

gutting the afc for a street driven truck is about as smart as removing your brain

(the one between your ears)_

why do you make it sound as if it is going to be the end of the world? i just ground the curve off my foot and nothing bad has come of it.

and some of us cant spend 200 bucks to have someone do the same thing we can do for FREE.
waste of money

__________________
94' cummins 12 valve. lots of fuel and a crazy ___ year old

SPECIAL THANKS TO TOXIC DIESEL

10-14-2009, 12:39 AM	#1 (permalink)
cummin not strokin3 Cummins Enthusiast Join Date: Dec 2008 Location: Oxbow Posts: 243 Thanks: 8 Thanked 3 Times in 3 Posts cummin not strokin3's Truck Pics	need help tuning pump so i installed my 0 plate and the truck has insanely horrible bottom end. it hits really hard at about 2300 rpm i have the plate about 3/4 of the way forward and my star wheel is about 2 turns from the spring being loose. the whole blowing black smoke thing was cool for a while but its getting old and now i just want power. another strange thing the truck does is when start out in a high gear and the truck almost stalls it will blow a huge thick cloud of grayish black smoke and it doesn't stop till about 2400 rpm or till i let off. its so thick that the whole street disappears __________________ 1997 dodge 2500 no plate 4" str8 pipe ,AFE BHAF,BD intercooler boots, boost and pyro gauges,what silencer ring? 2009 dodge 2500 6.7 stock as he!!

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10-14-2009, 09:50 AM	#2 (permalink)
jknowles4 Cummins Fanatic Join Date: Jan 2009 Posts: 101 Thanks: 0 Thanked 1 Time in 1 Post jknowles4's Truck Pics	Tighten up the starwheel and back out the pre-boost screw. Mine did the same thing as you describe. Was pretty cool when I first got the truck then it started to get embarrassing. Most people think that a truck smoking means it is a piece. Read up on pump tuning here and compD. I have it set pretty good right now, very little smoke and pulls great down low. I am having trouble with the topend now. Think I need to adjust timing! Last edited by jknowles4 : 10-14-2009 at 02:39 PM.

10-14-2009, 10:32 AM	#3 (permalink)
YOUNG GUNS15 Cummins Nut Join Date: Mar 2009 Location: Monticello Utah Posts: 385 Thanks: 0 Thanked 8 Times in 7 Posts YOUNG GUNS15's Truck Pics	i did a 2 houre tuning session on the highway and turned my starwheel way back and i actually gained alot of speed __________________ 94' cummins 12 valve. lots of fuel and a crazy ___ year old SPECIAL THANKS TO TOXIC DIESEL

10-14-2009, 10:42 AM	#4 (permalink)
mathews8pt P-pumped 24v Guy Join Date: Jul 2008 Location: Cardington, Ohio Posts: 4,451 Thanks: 9 Thanked 344 Times in 213 Posts mathews8pt's Truck Pics	Where is the AFC housing set? Have you flipped the washers in the housing? __________________ 2000 QCSB with a p-pump, typically broke and always stealing $$ from me ohiocoalrollers.com

10-14-2009, 02:34 PM	#5 (permalink)
cummin not strokin3 Cummins Enthusiast Join Date: Dec 2008 Location: Oxbow Posts: 243 Thanks: 8 Thanked 3 Times in 3 Posts cummin not strokin3's Truck Pics	what does flipping the washers mean __________________ 1997 dodge 2500 no plate 4" str8 pipe ,AFE BHAF,BD intercooler boots, boost and pyro gauges,what silencer ring? 2009 dodge 2500 6.7 stock as he!!

10-15-2009, 02:27 PM	#11 (permalink)
hoodstack96 Cummins Enthusiast Join Date: Feb 2008 Location: Connecticut. AKA between new york and boston Posts: 284 Thanks: 1 Thanked 14 Times in 13 Posts hoodstack96's Truck Pics	Just info gathered from others on the site. Just thought I would make it easier for others, since most cant grasp the concept of the search feature this site has __________________ 1996 2500 4x4, Externally Gated HX35+HT60,#10, 3000 GSK, 18*, DDP 191's,5x.012's, Modified AFC,5" Hood Stack, Home Made Traction Bars,Autometer Ultra Lite II Gauges,Auto to Manual,Valair 12 1/4" 3800# Ceramic, 3.54:1 Gears.