pump tweaking

[Cummins Cowboy]

ok today i finally got around to adjusting the injector pump. I adjusted the fuel screw about 1. 5 turns in. I got into the truck and noticed the idle was up to slightly over 900rpm up from 800 rpms which of course i expected. I took it for a spin and didn't notice much difference in acceleration. Does the power only come at the upper end of the rpm range??? Is there another adjustment that i can make that will make this one more pronounced?? or am i really getting more power and not feeling it LOL???? No i don't have any gages yet and i know i need them i don't do any pulling so i am not too worried. Also i did notice more smoke but it quickly dissipated as boost comes on. any thoughts?????

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93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[John Martines]

I turned about 2-21/2 and noticed a big difference mostly top end from 40mph up. I don't pull much and my egt won't go above 1200 and not much smoke. I'm running 31/2 exaust and Banks intercooler also might be helping in egt's and in power. These pumps do have a limit and I think a injector change is the next step.

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93'4+4 LE emerald green Banks PowerPack,Cummins chrome

 

[joesoot]

You can adjust the full load fuel delivery rate by turning the diaphragm under the top of the AFC. The below link to Dave Fritz' ram page contains diagrams and "howtos".
VE Pump Tweaking
Be careful, as these adjustments can shorten the life of your VE pump.

[This message has been edited by joesoot (edited 02-25-2001). ]

 

[Matt S]

I would recommend going with a turbo housing swap and an injector swap. You may also want to rotate the diaphram. You should be able to notice a change. Your current injectors may be what is limiting you.

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90 W250, 5-speed, isspro gauges, 16 cm2, K&N, Borgeson shaft, JRE 3" exhaust, Banks Intercooler, Lucas injectors

 

[RDusch]

be carefull with these pumps they will wear out real fast with the fuel screw adusted more than 1 1/2 to 2 turns, i was running 2 turns on mine and it went about 15k after
worn out cam plate and 2 broken rollers, i had the pump rebuilt, installed new injectors
(JRE) and now run the pump tuned up 1/2 turn the diaphram turned to max and the low fuel screw backed out all the way, still makes more power and plenty of smoke if i want it to (those low riders are so tempting!!).

Just my 2 cents worth

Rick D

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93 W 250, Banks,B&D,K&N,JRE,Rickson 19. 5's,FourWheel camper. <A HREF="http://rducsh.homestead.com/truck.html" TARGET=_blank>
Truck Spec Site</A>
<A HREF="http://albums.photopoint.com/j/AlbumList?u=279120&Auth=false" TARGET=_blank>
Photo Site</A>

 

[Gary - K7GLD]

AHHhh! That pointer back up above was EXACTLY what I have been looking for!

Did the 1/4 turn on the diaphram and star wheel - seems stronger on my "butt dyno", but will see what happens in the hills next time I pull our 5er...


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http://community. webshots.com/user/davison71 Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... MORE than a match for every new PS Ford encountered so far...

 

[Shrimpy]

I have a 92 that had the 21. 5 cm3 housing. Before I changed the housing I did the diaphram and star wheel adjustment. This was a HUGE increase in power even with the larger housing. Then I put the 16 cm3 housing on and I did not feel that much more of an increase in noticiable power. Then the PW injectors. These seemed to really smooth out the truck at all RPM's and gave a slight increase in power.

I can now spin the tires from a dead stop, and with a slight power brake really break them loose good. I am not having a smoke problem at all, just a slight noticable haze when accelerating. I have not turned the full fuel flow screw any at all.

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92 Ext. Cab, Auto trans. , 3. 54 Non-LS, Isspro Tach, 16 cm housing, PW injectors, no name 3 Gauge cluster, 230,000+ miles, straight pipe, old and abused but still running strong!!!!

 

[Gary - K7GLD]

SHRIMPY, how MUCH did you open yours up to get the gains you mention, and were you able to make any before/after pulling comparisons? I just opened mine a quarter turn each, and it SEEMS to feel stronger, but hard to tell. I don't see any change in smoke level (didn't have any to begin with!), but the boost appears to come clear up to max LOTS more easily than before. Dunno if I can REALLY tell the actual difference until I hitch up the fifth wheel and head for the hills...

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http://community. webshots.com/user/davison71 Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... MORE than a match for every new PS Ford encountered so far...

 

[Cummins Cowboy]

so which mod is going to give me the most power?? the fuel screw or the diaphram and star wheel adjustment?? and also which mod hurts the pump life the most??? The truck does feel more responsive and faster upon driving it a bit more. I just wish i had gages to compare with my stock readings.

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93 D250 5sp 3. 54 gears sans muffler, ISSPRO tach, K&N filter, needs to be bombed BAD
I would rather be cummin than stroken

 

[Shrimpy]

Gary I havent pulled any since the adjustments. Don't normally pull much any way. I turned my diaphram so that the MOST tapered part of the shaft that is connected to the rubber gasket (Diaphram) is pointed to the front of the truck. The shaft is shaped like a dunce cap (tapered all the way up) and is more tapered on one part (side). Install so that this area points to the front of the truck.

I turned the star wheel (located below the diaphram) in two full turns. I operated my throttle while I had the diaphram out and made sure the pin that rides on the diaphram shaft moved freely. Mine was sort of binding up, so I sprayed electric cleaner on it and continued to move the throttle to force the pin in and out. It soon was moving freely with no binding. I went one turn in on the smoke screw. Hope this helps.

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92 Ext. Cab, Auto trans. , 3. 54 Non-LS, Isspro Tach, 16 cm housing, PW injectors, no name 3 Gauge cluster, 230,000+ miles, straight pipe, old and abused but still running strong!!!!

 

[Wirenut]

Bring it over to my house and we'll have you getting 30++ psi in a couple of hours! #ad


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• '93 250 LE 4x4 5spd 4:10 Loaded,dual 5" chrome stacks,12cm² turbo(37psi),PW injectors,K&N,pyro/boost,US Gear E-Brake,tool box,CB,10" AR rims, 285/75/16 Bf goodrich. "wirenut_21529" on Yahoo Messenger
• '97 Ford B-Series school bus (5. 9 Cummins!)I'm gonna Bomb it!
• '94 GMC 2500 6. 5L Turbo

PICTURES.

 

[AlK]

Gary, the following post provides some good information on the Diaphram and Starwheel adjustments.
https://www.turbodieselregister.com/ubb//Forum2/HTML/000852.html
---
Al

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92-LE,4x4,5spd,3. 54,Borgeson steering shaft, Tach,Isspro Pyro & Boost, 16cm2, PW injectors

 

[joesoot]

Originally posted by cummins cowboy:
so which mod is going to give me the most power?? the fuel screw or the diaphram and star wheel adjustment?? and also which mod hurts the pump life the most??? The truck does feel more responsive and faster upon driving it a bit more. I just wish i had gages to compare with my stock readings.

Actually, all those mods done together are pretty dam impressive if you tinker and tune it enough. Get some gauges to establish a baseline, then tune away and take it for a drive, see "what" turn of "what" scew does "what" to your boost,egts and smoke level. I've seen dyno results on 1st GEN trucks ranging from 160-210hp to the ground with nothing more than an "optimized" pump. The cool thing about the VE pump is that if you do each modification and tinker enough, the combination really brings the engine to life(not that it wasn't before). I believe that Dave Fritz' page on VE pump tuning provides quite exellent insight into each function of each modification. What you gotta watch when tinkering with the pump, is that you don't become the Dutch boy with his finger in the dyke. Meaning, turning one thing up will bring about an unfavorable side effect(egt?), doing something to get rid of that unfavorable side effect(smaller housing), "uh-oh, my egts are back down now, i need more fuel"-injectors and a bonus in those: the higher flow injectors will take some load off of the VE pump. Next thing you know the Dyke stops leaking, your truck hauls *ss and your howling Getrag is almost toast. BOMB on but enjoy the ride too #ad


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2001. 5 2500 4x4 ETH/DEE
3. 55 LSD, Stock is all I will be able to afford for a few years.

[This message has been edited by joesoot (edited 02-27-2001). ]

 

[Gary - K7GLD]

Thanks Shrimpy - not sure how your setting on diphragm compaers to mine, I simply rotated mine 1/4 turn clockwise as suggested on the website pointed to up above - and then only 1/4 turn on the star wheel - it seems like there's quite a bit more star wheel adjustment left according to what you have done with yours. #ad


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http://community. webshots.com/user/davison71 Early '91 250, 727 AT, 307 rear... Banks Stinger exhaust, intercooler... US Gear OD... MORE than a match for every new PS Ford encountered so far...