How big of a turbo could you get a Cummins to spin? 4.1 or bigger? This would be a p-pumped motor so fuel probably wouldn't be an issue. Thanks

iadiesel's Sig:

2006 Chevy 2500HD CC/SB LBZ/Allison- EFI Live, Trans Go, 5" MBRP, Leveled with 285's

John Deere 4455 Hot Farm Pulling Tractor- 505cu, 850cc A-pump, GT4202R

thats a big effin turbo man most pro mods that run twins are just a lil bigger than 4in,and it would need to be a big p pump maybe even a sigma

hunter's Sig:

97 cummins 370s,laser cuts,afc tuned, #o plate,4 gsk,HD valve springs,16*,bhaf,4 in turbo back to 6in stack,phat shaft 62/14 531.8hp/1100tq

i only know of one guy pulling in the unlimited single class that pulls and is sucessful with a turbo over 4 inches.

Your gonna need a 14mm pump pushing a metric shit ton of fuel and it tuned just right to be able to stay on top of it down the track once you get the box coming forward

stkdram55's Sig:

Just an Inline 6 Cylinder

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would it work to put a garrett gt47 series 88mm on a cummins with a p pump? it has an 88mm inducer wheel and normally a .96 a/r ratio

it would most likely have to be a common rail head to flow a good enough air flow also to get it spooled.

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99 12v pull truck - bombs: 12v, 175 p-7100 pump, 4k gsk, SDX 5x.014, SDX competition DV's, goerends TC and VB, o-ringed block, airdog 150, mack rack plug, 60lb valve springs, arp studs

98 12v 2wd dauly - bombs: upgraded clutch, 100 plate, 300 marine injectors

thats really is suprising. i would have figured that a 5.9 would spool it quite nicely. i was wondering cause the factory 3.0 liter straight six in a supra will spool it mind you it spools at 4700-5000 rpm but i was thinking the displacememt would make up for it

gas engines work a lot different than diesels my buddy runs a 76mm on his 5.0

i mean i know they work alot diferent and guess i was just thinking along the lines of displacememnt not rpms and shit

i beleive many of the superstreet guys are running a 3.2+ charger and few are around 3.6 inducer. The problem with goin even larger like 4.1 is you can spool it no problem but its about granteed to snuff at the end of the track.

4.1 is huge, you would have to have a ton of air to spool that. By the way, a 12v head can flow tons of air when preped properly. Assuming you are just using this truck for pulling, and depending whatclass you are going to run i would stay more around the 3.0 to 3.6 rannge. But hey, you might be aable to pull it off. Even if you snuffed it at the end of the track you might be able to get a good enough run to make up for it, a lot of the pro stock tractors do it, they look at it as a race, they want to get down the track the fastest as possible, and it makkes sence, if you average 10mph faster down the track you might not need that grunt at the end of the track. Just my input, i just run a 3.0 truck, you want something totally different, good luck and let us know how it goes.

R&RDiesel's Sig:

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95 3.0 pro stock puller, rockwell, drop box.....

The injection pump and billet cam with big lift and duration is where its at. In this video the trucks that ran out all had a 3.6 or larger.

Very nice video, some good running trucks. We all run big pumps and cams in our 3.0 trucks. If i could afford it i would love to get a different turbo to run in nadm's unlimited class, but big turbos cost big money, i will just stick to my lil 3.0 for now.

Its not the turbo that cost money its the driveline you need to hold the power.

True but i have all of that all ready. If you can weld in a rockwell yourself, it really not that bad to build one, as far as money goes. But the drop boxes and reversers are expensive. I am still running a nv4500 with a pro fab drop box, with very good luck, but i will probably go to a reverser when or if i toast it. But so far the nv has held up to 1100 plus hp and the drop box well, if i break that i am either doing something really wrong or really bad!

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And you would be surprised what some really well built turbos for pulling cost, much more than my drop box!!

If you want to pay for those over priced turbos. Many of the top trucks on a national level run box charges from borg warner.