Big 3 Diesel Dyno Test

Kinja'd!!! by "Jcarr" (jcarr)
Published 03/23/2017 at 15:34

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STARS: 1

Interesting results here from The Fast Lane Truck. They took the most recent HD dually diesel from each of the Big 3 and did a dyno test at ATS Performance Diesel. Results below (spoiler).

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Spoilers Below!

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Ram 3500 6.7 Cummins

Claimed: 385hp / 900lb/ft

Dyno: 338hp / 828lb/ft

Ford F-350 6.7 Powerstroke

Claimed: 440hp / 925lb/ft

Dyno: 387hp / 807lb/ft

Chevy Silverado 3500 6.6 Duramax

Claimed: 445hp / 910lb/ft

Dyno: 337hp / 771lb/ft

Replies (16)

Kinja'd!!! "Nibbles" (nibbles)
03/23/2017 at 15:43, STARS: 1

Holy crapsnacks that’s a lot of loss on the new DMax. The other trucks dyno’d pretty much what I expected but shitballs, 25%/15% drop respectively on the Chevy, that’s a fuckton of loss.

Kinja'd!!! "Highlander-Datsuns are Forever" (jamesbowland)
03/23/2017 at 15:43, STARS: 0

Seat of the pants for me the Ford has the biggest balls, the throttle mapping and turbo are also more condusive for better engine response.

Kinja'd!!! "Jcarr" (jcarr)
03/23/2017 at 15:47, STARS: 1

Yeah, curious to see if this can be replicated by another tester. If so, bad news for Chevy.

Kinja'd!!! "Milky" (jordanmielke)
03/23/2017 at 16:08, STARS: 1

Dat Cummins tho.

Also TFL never disappoints at being disappointing. “828, its supposed to be 900 .... the mustang dyno is known as a heartbreaker now you know why.”

Bruh, thats less than 10% drivetrain loss, or you know shows that it makes more than claimed.

Kinja'd!!! "themanwithsauce - has as many vehicles as job titles" (themanwithsauce)
03/23/2017 at 16:30, STARS: 0

Is 20% still relevant anymore? You’d think dyno technology would be improving too. If every engine is “losing less than it should” then maybe the dyno is eating less power? I’d be amazed if it was still a 20% estimated loss to the dyno.

Kinja'd!!! "DanZman" (DanielHarpel)
03/23/2017 at 16:39, STARS: 0

That is a very disappointing performance by the chevy.

How is it that an FCA product seems to have come out on top?

Kinja'd!!! "Jcarr" (jcarr)
03/23/2017 at 16:44, STARS: 2

Probably because the engine isn’t made by FCA.

Kinja'd!!! "HammerheadFistpunch" (hammerheadfistpunch)
03/23/2017 at 16:54, STARS: 2

So I keep thinking that they ran this test wrong for the Ford and Chevy, either doing the pull in a gear that limits torque, or by not fully disabling electronic controls and so the trucks were again pulling torque. The drop for the ram is expected, but the drops for the Ford and Chevy are way out of line, especially considering these exact same trucks stomped all over the RAM on the same hill with the same trailer.

Also, why no charts? I want to see what the curves look like, not just the peaks. As far as I recall the cummins is very peaky and has a pathetically low redline.

Kinja'd!!! "HammerheadFistpunch" (hammerheadfistpunch)
03/23/2017 at 16:56, STARS: 0

I think they ran the test wrong, the Chevy which doesn’t weigh too different to the ram has proven to be faster with the same load on the same hill (these same trucks even) so it was either in regen, or pulling torque electronically.

Kinja'd!!! "Jcarr" (jcarr)
03/23/2017 at 16:56, STARS: 0

Yeah, I’d like to see that, or see someone else test all 3 same day/same dyno.

Kinja'd!!! "Manwich - now Keto-Friendly" (manwich)
03/23/2017 at 16:59, STARS: 0

From a total ownership experience, I’ve heard that the Cummins engine is the best from a long term ownership point of view.

Kinja'd!!! "Jcarr" (jcarr)
03/23/2017 at 17:06, STARS: 0

Makes sense given the fact that they have tons of experience.

Kinja'd!!! "Milky" (jordanmielke)
03/23/2017 at 17:30, STARS: 0

I’m sure (hopeful) its not 20% anymore as automakers try to eek everything out engines these days. Efficiency and not losing power sure is part of that. Hell, there was a meeting about a half a millimeter next to me today.

Just realized that if it was 20% drivetrain loss that’d put the cummins over 1000lbft. Damn.

Kinja'd!!! "Jordan and the Slowrunner, Boomer Intensifies" (jordanwphillips)
03/23/2017 at 18:32, STARS: 0

Having towed with a mid-2000's Cummins and Duramax, I see GM still overrates the Duramax. The Duramax feels incredibly weak in comparison, all the while being rated more powerful.

Kinja'd!!! "Jordan and the Slowrunner, Boomer Intensifies" (jordanwphillips)
03/23/2017 at 18:32, STARS: 0

Because Cummins, not FCA.

Kinja'd!!! "Demon-Xanth knows how to operate a street." (demon-xanth)
03/24/2017 at 10:08, STARS: 0

The Ford looks inline, but the Chevy seems strangely off.