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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #11  
Old 06-24-2013, 05:44 AM
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Quote:
Originally Posted by Chefalan23 View Post
Great numbers for sure! Just out of curiosity, where does the big power loss come from in the drivetrain?
It's called parasitic loss. Carmakers publish their power numbers at the crank. Transferring that power to the rear wheels sustains a power drop. For an auto tranny, the power loss is in the range from 18-20% drop from crank to rear wheels. RWHP (rear wheel horse power) will always be less than crank/advertised HP.
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  #12  
Old 06-24-2013, 09:50 AM
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Dyno sheets or a vid or it didnt happen...
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  #13  
Old 06-24-2013, 10:21 AM
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...or just hit the local track and post up your 13 second slip

My best pull on a Dynojet,
with a long list of mods, was just 317 HP, 347 Torque...but at least I've got a dozen 13' slips


"Dyno time on my 2011 express s/c"


What's the s/c stand for? super charger?
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Old 06-24-2013, 01:03 PM
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Quote:
Originally Posted by BlackRamHemi View Post
...or just hit the local track and post up your 13 second slip

My best pull on a Dynojet,
with a long list of mods, was just 317 HP, 347 Torque...but at least I've got a dozen 13' slips


"Dyno time on my 2011 express s/c"


What's the s/c stand for? super charger?
It might just mean Short Cab but thats what i was wondering too why not just put regular cab. Or maybe he is posting up numbers prior to doing a supercharger??? Either the folks down in mexico gave that motor some extra cubic inches or that dyno was loose as a goose!!!
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  #15  
Old 06-24-2013, 02:35 PM
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Quote:
Originally Posted by RamTex View Post
It might just mean Short Cab but thats what i was wondering too why not just put regular cab. Or maybe he is posting up numbers prior to doing a supercharger??? Either the folks down in mexico gave that motor some extra cubic inches or that dyno was loose as a goose!!!
I just tough this was funny. Maybe i needed a loose dyno for my numbers maybe it wouldn't have been so depressing lol.
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Old 06-24-2013, 05:13 PM
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Quote:
Originally Posted by cal45 View Post
It's called parasitic loss. Carmakers publish their power numbers at the crank. Transferring that power to the rear wheels sustains a power drop. For an auto tranny, the power loss is in the range from 18-20% drop from crank to rear wheels. RWHP (rear wheel horse power) will always be less than crank/advertised HP.
Got you on that, I was more so wondering what part specifically in the drivetrain is the weak link where parasitic loss in concerned. Is it the driveshaft, tc, trans, ect. What parts can be upgraded to reduce the loss? I don't hear about anyone installing aluminum DS.
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  #17  
Old 06-24-2013, 05:53 PM
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Everything that "rotates" after crank/flex plate is responsible for drive train loss.

Torque converter, transmission, transfer case, drive shafts, differential, axles, wheels and tires.

The biggest factor is the only thing you cant change though, the Transmission.

Word is the new 8 speed trans is up to 10% more efficient than the old 5/6 speeds though.
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  #18  
Old 06-24-2013, 07:48 PM
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Exclamation Dyno

Thanks for the replies,for those of you haters,that cant take a man for his word i dont care to waste my time with you(why would someone make up random numbers to impress anyone)if i did that i would only be lying to myself.i was there and i know what my truck does,,,,,
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  #19  
Old 06-24-2013, 08:21 PM
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I believe that's what your dyno sheet reads,
but a dyno is only as good as the guy operating it and the one who calibrated it.

A bone stock Ram "Should" barely break into the 300's under ideal conditions
The Dyno is simply a measuring/tuning tool and if you did a before and after on the same machine it would tell you how much you gained. Nothing more, nothing less.

Since a muffler and intake alone is highly unlikely to see a +50HP gain,
we are saying your truck bone stock on that same dyno would very likely have read higher than normal too...probably 320-330 HP.
...which is not normal, but certainly has happened before.

If you think your Ram came out of the factory 20-30HP higher than everyone elses then you would be fooling yourself.

Now if you had a buddy with a similar truck with zero mods run 290-295 HP on the same dyno, same day, same operator
then yes, Your 350 HP would be very impressive without a tune.
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  #20  
Old 06-24-2013, 09:28 PM
S.C. Express S.C. Express is offline
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Why could his truck not have came from the factory with a bit more h.p/tq. power? Manufacturing tolerances are a major factor here.. When buying new cars.,some people get the occasional lemon, some get the rare gem. Maybe he got lucky, or maybe the dyno was off a bit.
@ the OP, put that thing on the track and show us a time slip please!
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