why is the 5.7 in the ram rated higher? - Dodge Challenger Forum: Challenger & SRT8 Forums
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#1 (permalink) Old 01-14-2013, 11:06 AM
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why is the 5.7 in the ram rated higher?

I was just curious as to why the 5.7 hemi in the ram is rated at 390hp, and the Challenger is rated at 375? Are there some mechanical differences in the two engines, or does Dodge like to underate the 5.7 in the Challenger to show more of a power gap between the 5.7 and 6.4.
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#2 (permalink) Old 01-14-2013, 11:25 AM
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The Rams 5.7 has an active intake manifold and I also believe it has a different cam.

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#3 (permalink) Old 01-14-2013, 02:29 PM
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It's because they have a oil pressure controlled intake. why you wouldn't put it on the premier sports car is beyond me.

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#4 (permalink) Old 01-14-2013, 07:46 PM
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This was discussed a lot back in 09, the throttle body on the truck engine is to tall to fit under the Challenger hood. That was the reason then.

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#5 (permalink) Old 01-14-2013, 08:33 PM
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it could be two things.

(1) the intake on the Ram is the same active intake on the 392 Challenger
(2) Dodge would rather close the gap in the performance numbers of their TRUCK to compete more with the Silverado and F150 than their cars (Camaro vs Mustang).
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#6 (permalink) Old 01-14-2013, 08:37 PM
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Maybe they just said it had more HP so everyone would wonder why??.....
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#7 (permalink) Old 01-14-2013, 08:48 PM
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Not trying to kid myself, but the R/T has to be under rated. The performance of the R/T tells me it has more than 375 hp. Maybe not much more, but more.

When someone asks me how much hp my R/T has, I don't exaggerate, I tell them 375....but deep down I know it's more.

Hasn't anyone dyno'ed a 5.7 at the crank to discover the truth?
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#8 (permalink) Old 01-15-2013, 09:30 AM
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I agree...my suspicion is that the difference in numbers came purely out of marketing politics that decided the Challenger RT could not be "390" while the (then current) SRT8 was just sitting a step above 400.

Was there ever a Hemi Ram SRT8? What was that rated?

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#9 (permalink) Old 01-15-2013, 11:26 AM
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Quote:
Originally Posted by randycat99 View Post
I agree...my suspicion is that the difference in numbers came purely out of marketing politics that decided the Challenger RT could not be "390" while the (then current) SRT8 was just sitting a step above 400.

Was there ever a Hemi Ram SRT8? What was that rated?

Never was an SRT8 Ram but there was an SRT10 Ram (2004-2006). They made it in a std cab with 6sp manual and quad cab with auto.....had the 8.3L Viper motors rated at 505 HP....I owned a 2006 std cab...badazz truck..

Chrysler has a reputation for under-rating HP...when you do the math (RWHP, ET vs weight, etc) on the 6.1 engines they better match an engine putting out cloeser to 450hp than 425hp.......similiar to this the 6.4 is probably putting out closer to 500 than 470...

Last edited by Bradley Manning wannabe; 01-15-2013 at 11:26 AM.
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#10 (permalink) Old 01-15-2013, 12:00 PM
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Quote:
Originally Posted by TNCHARGER View Post
Never was an SRT8 Ram but there was an SRT10 Ram (2004-2006). They made it in a std cab with 6sp manual and quad cab with auto.....had the 8.3L Viper motors rated at 505 HP....I owned a 2006 std cab...badazz truck..

Chrysler has a reputation for under-rating HP...when you do the math (RWHP, ET vs weight, etc) on the 6.1 engines they better match an engine putting out cloeser to 450hp than 425hp.......similiar to this the 6.4 is probably putting out closer to 500 than 470...
Those SRT10 Dodge trucks (I refuse to call them "Rams") are beautiful, especially the regular cab ones.


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