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Old 07-10-2010, 10:49 PM   #1 (permalink)
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Thumbs up best power adders

i just got myself a cummins about two weeks back. i am trying to go for some big power out of this thing but am new at diesel performance only built gas motors before this. i have already gotten the ats tranny and torque converter in it and i have ordered a new 4 inch turbo back exhaust. now i have heard turnin the fuel pin up will give it more power idk how much?? but i am going to try and do tht but what would be next?
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Old 07-11-2010, 01:52 AM   #2 (permalink)
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pyrometer, then a denny t fuel pin
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Old 07-11-2010, 01:04 PM   #3 (permalink)
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Pyro and boost gaugs, Denny t fuel pin, turn fuel screw to just before runaway, turbo upgrade, upgrade airhorn, etc...... Just so u no u can't make BIG power with a ve. Most ever made was jus over 700hp
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Old 07-11-2010, 01:37 PM   #4 (permalink)
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Just so u no u can't make BIG power with a ve.
So you're saying that a 160hp VE fueled Cummins making 450hp isn't making big power?
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Old 07-11-2010, 01:40 PM   #5 (permalink)
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Lol not compared to a 1400 pony ppump lol
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Old 07-11-2010, 02:47 PM   #6 (permalink)
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Well here is the order of my mods -
  • ISSPRO Boost, fuel pressure, pyro (no performance gain)
  • South Bend clutch (Getrag needed a rebuild, so upgraded for the coming bombing)
  • Turned the pin - minimal gain
  • 5 x .014 injectors - significant gain, but with stock turbo was "peaky" temps were still reasonable, fuel pressure would go to 0 under 15+ pounds of boost
  • HTT 62/65/13 - no real power gain, but smoothed out power band and reduced temps, boost with stock turb was 22 pounds, HTT pushed it to 32, spiked to 36 psi once
  • Source Automotive (Diamond Eye) 4" turbo back, straight pipe exhaust - done with turbo
  • BHAF - done with turbo
  • Piston Lift pump, 3/8" feed line, 5/16" return - minimal performance gain, but brought fuel pressure up to 15psi under boost
  • A1 studs with OEM gasket - I blew my head gasket the ONE time my boost spiked to 36 PSI
  • 3600 RPM governor spring - see below
  • Turned full fuel screw - while I had the pump apart for the spring change I removed all the "lockouts" from the pump adjustments, turned my full fuel screw up significantly (still no indication of runaway), all I can say is WOW. I can roll from 40-90 in 4th gear and get there RIGHT NOW, temps are 1400ish and boost is 45 (waste gate blocked)


I did things in the order I did due to time and parts deals (group buys and good old fashioned negotiations)... I still have more on the "wishlist"... But now I am focusing more on getting the temps down. I want to do a cam swap, ported head, 3 piece exhaust manifold and intercooler upgrade... I also want to do a M2 pin, but Thomas is on vacation right now so it might be a couple weeks...


If I was to do it all over again I would probably do it in this order:
  • GAUGES - boost, pyro, fuel pressure and trans temp (for automatic)
  • Piston lift pump and fuel lines
  • governor spring, turn pin and full fuel screw
  • Turbo/exhaust/BHAF
  • M2 fuel pin
  • Studs
  • Injectors (and likely more pump tuning)


JMHO


*EDIT* After another run, the truck will hit 1600* if I run it WFO all the way to 110ish...
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"lightly modified" 85 Crew Cab: 92 CTD, 6" lift, South Bend ConO clutch, ISSPRO gauges, 5x.014s, HTT 62/65/13, ported, studded and o-ringed, 4" turbo back, piston lift pump, M2 fuel pin, M&H timing spacer, pump turned up, 3200 RPM governor...

Last edited by freak007; 07-11-2010 at 11:53 PM.
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Old 07-11-2010, 03:10 PM   #7 (permalink)
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You haven't said what you've done with the injection event timing . . . . . ?
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Old 07-11-2010, 11:46 PM   #8 (permalink)
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You haven't said what you've done with the injection event timing . . . . . ?
Injection timing is stock...
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"lightly modified" 85 Crew Cab: 92 CTD, 6" lift, South Bend ConO clutch, ISSPRO gauges, 5x.014s, HTT 62/65/13, ported, studded and o-ringed, 4" turbo back, piston lift pump, M2 fuel pin, M&H timing spacer, pump turned up, 3200 RPM governor...
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Old 07-22-2010, 09:27 PM   #9 (permalink)
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im in the coming stages of building my 91 for some serious pulling action, i dont have much right now but i guess ill shoot you my parts list.
in order
i did a fresh pump rebuild this spring and put 370 marine injectors in it

boost, pyro, fuel, tranny temp gauges
piston lift pump swap
4 in tb exhaust- 6in stacks
built tranny- either build up auto thats in it or nv4500 swap
engine time
possible head swap if injector orifices are cracked
14 mm head and main studs
guerilla block girtle
turbo
p pump conversion, possible built to 8.3L specs with mack delivery valves = maddd fuell
o and finally, paint and body work lollll
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Old 07-25-2010, 12:05 PM   #10 (permalink)
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Hey morinscummins....i see you have guerilla block girdle.....if ya don't mind me asking, how much for the kit? I never even heard of it before, until i seen you write about it. My block is currently cracked and i like the thought of putting this on my replacement engine! I watched the youtube video of it and thats pretty darn slick.
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