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Old 07-01-2012, 10:18 AM
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Difference between 5.7 and 6.4

Hello, I have a 2011 RT 5.7 auto. I have only 2 years on my lease left and may get out of it early so I can get into a 6.4 SRT8 auto earlier instead of waiting the two years.

-Is there that much of a difference between my RT and the new SRT8. I have never driven the SRT8 6.4, and would love to know?

-The numbers for my car are 376hp and 404tq. The numbers for the SRT8 are 470hp and 470tq. It is more, but it doesnt seem like a huge difference. It is about 100hp and 70tq more...

thanks
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Old 07-01-2012, 10:28 AM
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Having owned the R/T, 6.1, and now the 6.4, yes there is a tremendous difference.

Key differences:
- adaptive 3-mode suspension
- Brembo brakes
- engine (yes you will notice a huge difference)


What I would suggest is go test drive a 2012 392. Nothing typed out will be able to explain the driving experience difference.


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Torred '09 5.7L R/T - 13.291 @ 103.67 mph

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Old 07-01-2012, 12:05 PM
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It's a whole different animal !
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2012 SRT8 Challenger 392 6-speed
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Old 07-01-2012, 12:06 PM
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It depends on if the R/T has a 6speed or not and then the mods that have been done...
With my mods, on my '09 R/T 6 speed...I make more RWHP than the 392(I make 417hp on a Dynojet vs. my 364RWHP baseline)and most 392's only make 400ish for RWHP stock with no programming available...I have LESS $ in my R/T than the 392SRT8 costs...even with suspension & brake mods, bolt on engine mods, and programming of the PCM. If I do a VVT Cam and ported heads...I will be close to 500 RWHP...and still be under the cost of the SRT8-392 without supercharging or forging the motor. Just depends on what's important to you and where you want to go...better off buying a used Challenger 6-speed and modding the hell out of it.
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Old 07-01-2012, 12:16 PM
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Originally Posted by tommasom View Post
-The numbers for my car are 376hp and 404tq. The numbers for the SRT8 are 470hp and 470tq. It is more, but it doesnt seem like a huge difference. It is about 100hp and 70tq more...
100hp bump makes quite a difference, you'll have no problem noticing a difference
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Old 07-01-2012, 12:18 PM
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The 6.4 is a huge difference. I had a 09' supercharged R/T and my 6.4 is way faster than my old R/T. I also made the switch from a manual to an automatic, because I wanted to do better at the drag strip. The HP numbers don't tell the whole story. The real difference is the torque, which is more than 90 ft/lbs more than the stock 6.1, and makes the 6.4 a beast. This 6.4 comes out of the hole like a rocket compared to my old 5.7. My car just dragged on Friday and got a corrected E.T. of 12.2. The actual E.T. at +2000 Density Altitude was 12.5 with drag radials.

The best suggestion I can make is to test drive a 392 turn off traction control and go WOT on a straight road. Your head will be slammed into the headrest. Judge for yourself.
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Old 07-01-2012, 12:43 PM
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I'm with all the guys above. I too have had a heavily modded 5.7 with SC and a 6.1, this 392 is awesome. It's just an all around better car than the old RT or 6.1 was/is. HP #'s won 't tell the full story. Hard to tell you without driving it. There are few cars out there that accelerate from a dead stop like this heavy beast. I have a Hennessey Viper and coming out of the whole my 6.4 is there. Different story though once we get above 45mph. All in all this 6.4 is one of the more satisfying cars I've owned. I buy hotrods all the time but this will be one I'm keeping.
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Old 07-01-2012, 01:46 PM
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Huge difference!

I just traded my 11 rt for a 12 srt...i dont care what anyone says. People say you can take an rt and make it a srt clone by doing suspension and some hp upgrades. Nope I had suspension on my rt and it wasnt nearly as responsive as the srt it. The srt is night and day. Its a completely different animal.
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Old 07-01-2012, 02:13 PM
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What I would suggest is go test drive a 2012 392.
I wish I could! NONE of the dealers around here will let you test drive one until you actually buy one!
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Old 07-01-2012, 02:29 PM
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Originally Posted by SparkChicken View Post
The 6.4 is a huge difference. I had a 09' supercharged R/T and my 6.4 is way faster than my old R/T. I also made the switch from a manual to an automatic, because I wanted to do better at the drag strip.
Sounds to me you didn't drive a stick very well if it is way faster!!! I would think a supercharged 5.7 should hang pretty easily with a 392!!
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