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5.9L 12V Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps Related to Performance and Longevity

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  #1  
Old 09-08-2011, 01:12 PM
93ford's Avatar
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Default 400-450 hp goal

I know there are a million threads like this, but I'm not finding what I'm looking for so I'm just gonna ask. I'm about to do a cummins conversion on my ford, putting in a 12v out of a 96 auto. It's a bone stock motor with 130k on the odo. What needs to be done to make 400-450 hp? I will remove the kdp before install.

So far I'm looking at:

370 marine injectors
no fuel plate
TST light tension fuel spring
4k gsk
60 lb valve springs
BHAF
my 4" exhaust
phatshaft 62


Will this setup make my goal? Is there anything on this list not necessary? Can I get my goal with just upgrades on my hx35 instead? I'll be looking into a south bend clutch as well. I'm going to keep my zf5 since I've had it gone through.

Thank you for your time and nice site.

93ford's Sig:1993 7.3 xlt, 093 plugged, pump maxed, zf5 conversion with SMF, kingpin d60 front, hypermax cowl intake, 4" straightpipe off 3" downpipe, 5" tip, 4.10 limited slip, 37s, 6" lift, f SD rear springs.
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  #2  
Old 09-08-2011, 04:20 PM
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I'd invest in better injectors, like SDX 5x.012's. Personally, I'd just grind the fuel plate to a 100 and start with it centered in the slots so you have a little room to slide it forward and back according to the happy median between your butt-dyno and EGT's. No need for the light spring, really...just snag the awesome AFC tuning writeup sticky and tune your AFC accordingly (the AFC doesn't add horsepower, it just helps control the smoke and the takeoff grunt really...). Also, being a current PhatShaft 62 runner, I'd suggest upping the ante for a Silver Bullet unless you can handle a little turbo lag...I know that mine leaves a little bit to be desired.

All that in mind, plus a little timing bump and most likely a lift pump upgrade, you'll probably be in the running for right around 400 hp if everything is tuned correctly and the engine is tight. If not, perhaps look into the article that Diesel Power Magazine just ran on a "400 hp kit" for the P-pump Cummins that involves a HX35 exhaust housing upgrade, injectors, modified delivery valve springs, rack plug and some other hocus pocus all in a $1500 kit, iirc. Might be worth a look...

Good luck on the Fummins build! Glad to see another OBS Ford getting Cummins power!

93_Fummins's Sig:1993 F-250 "Fummins": P-pumped 12-valve, 5x.012 injectors, 4k GSK, PhatShaft 62, aFe Bladerunner and ProDry filter, '99 Powerstroke IC, cut fuel plate FF, AFC tuned and FF, KDP killed, head studded, 60lb valve springs, 16* timing, SB CONFE clutch (Getrag 360), AirDog 150...
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  #3  
Old 09-08-2011, 07:44 PM
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x2 on better injectors... but if u have the trans to hold it you should be there with ur setup or pretty darn close

---AutoMerged DoublePost---

may wanna upgrade dv's too...maybe some 181's

monster12valve's Sig:SOLD! 94' 2500 4x4, 5"mbrp to 8in black stack , bhaf, no plate, afc tune, isspro gauges, 4k gsk, 60lb VS, ATS intake manifold, tc lock up switch, 5x14's, 191 dv's, single disk, shift kit.
2007 powerstroke, cc,sb 4x4. stockish

Last edited by monster12valve; 09-08-2011 at 07:44 PM.. Reason: Automerged Doublepost
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  #4  
Old 09-08-2011, 09:53 PM
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alright, thanks for the info guys. would i need studs at this range? and is a 4kgsk necessary? if i just go with a 3kgsk i wont need valve springs. Not that they're expensive, but then I don't have to take the head off and get a valve job done.

would a gt37r be a good choice over the phatshaft? i love that bb whistle
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  #5  
Old 09-09-2011, 08:14 AM
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Personally, I think the 3k springs would just leave you wanting more. I have 4k springs (and 60lb valve springs and studs, mind you) and I love that mine pulls strong and doesn't start defueling until well past my 2500 rpm "****-it-n-git-it" shift point when I'm messing around. I would encourage the 4k GSK/valve spring/stud combo if you can swing it in your budget, but I can't really say that any of them are necessary for a daily driver. The 3k GSK will probably be fine if you're just looking to overcome that early defueling.

I don't know about a gt37r, but my PhatShaft 62 whistles pretty good...
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  #6  
Old 09-09-2011, 05:23 PM
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just put in the 4k....i agree with 93 fummins....you will want more.
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  #7  
Old 09-15-2011, 07:18 PM
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im running 4ks in my truck with no 60lbs just use your foot to not go past 3200ish

cumminspwr11's Sig:1995 auto, 4x4, 181 dvs, 5x12s, triple disk billet tc, no plate, afe intake, exhaust, afc mods, custom intake horn, 2095 rack plug, 18*, 4k govenor springs, kdp killed, somewhat built trans, mighty diesel head bolts, port and polish, he351vgt, 3.73 gears, hp front axle with free float hubs
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  #8  
Old 09-16-2011, 09:18 PM
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That's dangerous though... sure, it's possible, but if you break a driveshaft (or whatever), your foot will be on the floor for far too long

Rx7man's Sig:94 dodge 12v dually, stg 2 inj, 4" straight pipe, BHAF, #10 fuel plate full forward, 3K GSK, boost/pyro, 4.10 gears, NV4500 manual, BD exhaust brake, ~30psi peak boost, southbend 475 HP clutch, .010" head gasket, ARP head studs, Advance timing to where it liked it.
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  #9  
Old 09-16-2011, 10:47 PM
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I thought the 180hp pump came with 181 dvs. I may be mistaken

lodal cummins's Sig:1996 Dodge 12 Valve,100 Fuel Plate ff, Silencer Ring Removed, bhaf, AFC Tuned, Boost Elbow, 4"turbo backstage 2 75hp injectors
Boost & Pyro Meter Gauges, Automatic with low stall convertNer & Shift Kit
kdp killed,timing 15.5* 3kGSK Email: lodal@comcast.net
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  #10  
Old 12-14-2011, 06:03 PM
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Originally Posted by lodal cummins View Post
I thought the 180hp pump came with 181 dvs. I may be mistaken
I think so, its either 181's or 191's, I just know for sure its not 131's. 160's and 175's had 131's and 180's and 215's had the other ones.

Originally Posted by cumminspwr11 View Post
im running 4ks in my truck with no 60lbs just use your foot to not go past 3200ish
Its too cheap and too easy to change to make it not worth running 60lb springs IMO.

EasternAggie's Sig:
"ol blue"
1994 Ford F-150: 12v Cummins NV4500
Mods: Amsoil 4510, 5" exhaust, ISSPRO pyro/boost/FP, tuned pump, CD 5x.014's
4k GSK, 60lb springs, 35/40 hybrid, Mighty Diesel head bolts, 6k HID's
Audio: Hi-tech music box, new door speakers, 12" Kicker L7, Kicker 750.1, Probox
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