Gas vs PSD
Senior User
Joined: Nov 2009
Posts: 219
Likes: 0
If a v-10 is faster than a PSD who cares, just add a simple programmer and light mods and the PSD will be untouchable. Im sure most of the people on here who research about their truck certainly don't drive stock anyway. all things the same, you can add a programmer to a gas engine and get minimal power gains but better shifting, add a programmer to a diesel and you just found yourself a whole new truck you have never seen before.
Posting Guru
Joined: Aug 2007
Posts: 1,317
Likes: 0
From: Auburn, Wa
I want to build my 7.3 but for the cost a Used duramax with tuning and built trans is way below the cost after selling my truck then building my 7.3.
the 6.0's main downfall was the lack of head bolts per cylinder.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
the 500 hp generated from such a motor is very modest. its 2.5x the size of the 5.9's, with < 2x the hp, BUT 3x the amount of torque. . . . the 14L ISM cummins is rated at 435hp at 600 rpm. 600 rpm!. it has a torque peak of just under 2,000 lb/ft at 1250 rpm, with factory redline of 2400-ish. its peak hp is a little over 500, so from 600 rpm to 2400 rpm it virtually has between 435 and ~500-525 hp. . . .
I shouldn't need to tell you why but I will. The ISM cummins is NOT 14L never has been. It is also not rated at anywhere near 435hp. It is ACTUALLY rated at 280hp at 500rpm and it's torque rating is is 1150-1550 at 1200rpm (no where near 2000ft/lbs)
Now if your talking 14L then the N14 is rated at 310 @ 525rpm and 1250-1850ft/lbs at 1200
so what you ACTUALLY should have been quoting was the isx which is 14.9L
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Rob, correct me if I'm wrong, but I thought when you get the new engines in a semi, you have options on horsepower. It could range from around 300HP up to perhaps 600HP, depending on the engine. I'm assuming the difference would be in the injectors, turbo, and tuning. In fact, with the right computer, program, and the right person using it, you can tune a big truck in much the same way as a PSD, correct?
Fleet Mechanic
Joined: Sep 2007
Posts: 1,256
Likes: 6
From: Garden Valley, Idaho
My 2008 F-250 4X4 super cab short bed with my bumpers and usual crap, filled with gas, weighs 8100. I would expect a stock diesel with stock bumpers to be close to that number as well. My front bumper weighs around 275 and the rear is around 250. My tool box with crap probably weighs another 300 easy.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Rob, correct me if I'm wrong, but I thought when you get the new engines in a semi, you have options on horsepower. It could range from around 300HP up to perhaps 600HP, depending on the engine. I'm assuming the difference would be in the injectors, turbo, and tuning. In fact, with the right computer, program, and the right person using it, you can tune a big truck in much the same way as a PSD, correct?
Senior User
Joined: Sep 2004
Posts: 116
Likes: 0
the 500 hp generated from such a motor is very modest. its 2.5x the size of the 5.9's, with < 2x the hp, BUT 3x the amount of torque. . . . the 14L ISM cummins is rated at 435hp at 600 rpm. 600 rpm!. it has a torque peak of just under 2,000 lb/ft at 1250 rpm, with factory redline of 2400-ish. its peak hp is a little over 500, so from 600 rpm to 2400 rpm it virtually has between 435 and ~500-525 hp. . . .thats almost its hp max from idle to redline.
I shouldn't need to tell you why but I will. The ISM cummins is NOT 14L never has been. It is also not rated at anywhere near 435hp. It is ACTUALLY rated at 280hp at 500rpm and it's torque rating is is 1150-1550 at 1200rpm (no where near 2000ft/lbs)
Now if your talking 14L then the N14 is rated at 310 @ 525rpm and 1250-1850ft/lbs at 1200
Now if your talking 14L then the N14 is rated at 310 @ 525rpm and 1250-1850ft/lbs at 1200
By my calculations, 280 hp @ 500 rpm would yield over 2,900 ft-lbs of torque at that speed, 435 hp @ 600 rpm would give over 3,800 ft-lbs, and 310 hp @ 525 rpm would be over 3100 ft-lbs--all waaaaaaaay above the peak torque numbers you are listing.
And according to the spec sheets linked at http://www.cummins-sp.com/document_l...ne_ratings.pdf , even the highest rated ISM 500 doesn't make 280 hp until 1100 rpm.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Cargo Master
Joined: Jan 2005
Posts: 2,413
Likes: 11
I would think that if some thought went into the tuning and it was done sensable then longevity could be increased. Going nuts w/ the tuning w/ out upgrading the parts that get stressed is just stupid and will no doubt cause failure. I think its safe to say that the tunes on this trucks from the factory are alittle mild. Alittle tuning can improve everthing across the board to suit your actual driving habits. That's the one thing the factory can't program for. Its inpossible to have a tune to best all of our driving habits. But the saying is wanna play you gotta pay.
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
tuning on highway tractors is less popular than pickups.
1st off, they get inspected all the time, so hacking off emission parts is not an option.
2nd, I met a dude that threw on a 50 HP chip on his 550 CAT PETE, and drivetrain problems developed within days. The truck was 2 weeks old.
3rd, we get away with big chips cause we're driving pickups around like toys. A semi is almost always hauling weight, so how can you really boost power without crazy EGT's and other problems?
1st off, they get inspected all the time, so hacking off emission parts is not an option.
2nd, I met a dude that threw on a 50 HP chip on his 550 CAT PETE, and drivetrain problems developed within days. The truck was 2 weeks old.
3rd, we get away with big chips cause we're driving pickups around like toys. A semi is almost always hauling weight, so how can you really boost power without crazy EGT's and other problems?
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
tuning on highway tractors is less popular than pickups.
1st off, they get inspected all the time, so hacking off emission parts is not an option.
2nd, I met a dude that threw on a 50 HP chip on his 550 CAT PETE, and drivetrain problems developed within days. The truck was 2 weeks old.
3rd, we get away with big chips cause we're driving pickups around like toys. A semi is almost always hauling weight, so how can you really boost power without crazy EGT's and other problems?
1st off, they get inspected all the time, so hacking off emission parts is not an option.
2nd, I met a dude that threw on a 50 HP chip on his 550 CAT PETE, and drivetrain problems developed within days. The truck was 2 weeks old.
3rd, we get away with big chips cause we're driving pickups around like toys. A semi is almost always hauling weight, so how can you really boost power without crazy EGT's and other problems?
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
I rode in a 700 HP cummins semi, don't know if it was chipped or stock. It had a little bit of torque to it. Showing 7 mpg around town.
Lead Driver
Joined: Jan 2006
Posts: 6,267
Likes: 5
My friend was going to turn his semi up, but I told him about this thread, now he's looking to swap a V10 Triton into it.