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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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  #1  
Old 08-15-2012, 01:06 AM
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2012 5.7 liters HEMi is 390hp....crank or wheels?
Anyone dynoed his stock truck here?I need the wheels hp's and or the drivetrain loss(%).
Thanks!
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  #2  
Old 08-15-2012, 01:34 AM
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The "claimed" 390 ponies is crank.

Yes, several have dynoed their trucks and I'm sure they'll chime in upon discovering this thread.

There are TONS of variables, but I've always been taught that there's app. 15-20 percent loss/change of HP from crank to the wheels.

Finally, there's really no need to post multiple threads asking the same questions on various sections of the boards. Most members use the "New Posts" button so, believe me, one time only and your thread will be viewed by MANY.

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Old 08-15-2012, 02:36 AM
Jchaney579 Jchaney579 is offline
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308whp/332ftrq on my truck dynoed back a couple months ago when it only had 350 miles on it.
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Old 08-15-2012, 02:55 AM
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390 is at the crank. Most see 300ish to the wheels stock.
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Old 08-15-2012, 06:28 AM
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HP rating is at the crank.
Figure about 20% drivetrain loss so about 305-310hp at the wheels....
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Old 08-16-2012, 07:25 AM
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Nice to have the new motor mines 300 rear wheel with full bolt ons and a cam lol
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