24 hours in Rental 5.7/A8 Challenger - Page 4 - Dodge Challenger Forum: Challenger & SRT8 Forums
2015 to Current R/T & RT Plus Specific This area is for vehicle specific information about the 2015 and beyond R/T and the R/T Plus

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post #31 of 41 (permalink) Old 04-06-2019, 01:23 AM
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post #32 of 41 (permalink) Old 06-08-2019, 07:28 AM
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Hal- if my 2012 Challenger RT has 400 ft/lbs. of torque, I can't feel it. Maybe it's the doggy 3.06 rear differential I got along with the 5 speed auto trans. I don't feel much power with this car until I rev it up past 4,500 rpm, maybe that's just a hemi thing. I'm used to General Motors V-8s with more torque right out of the gate.

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post #33 of 41 (permalink) Old 06-08-2019, 09:50 AM Thread Starter
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Hal- if my 2012 Challenger RT has 400 ft/lbs. of torque, I can't feel it. Maybe it's the doggy 3.06 rear differential I got along with the 5 speed auto trans. I don't feel much power with this car until I rev it up past 4,500 rpm, maybe that's just a hemi thing. I'm used to General Motors V-8s with more torque right out of the gate.
I would not have hesitated letting any family member drive the ‘17 R/T 5.7/A8/open-3.07 Challenger that I rented last year. The 5.7 was impressive, but not intimidating. I can understand why rental car companies have them.

I hesitate letting anyone, except my wife, drive the ‘18 R/T SP 6.2/A8/limited-slip-3.09 Challenger that we bought. The 6.4 is stupid-quick enough as to be almost intimidating. I can only imagine what the 6.2 cars feel like!

Maybe the 6.4 is significantly under-rated?

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post #34 of 41 (permalink) Old 06-08-2019, 10:44 AM
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Originally Posted by LT1 Iron View Post
Hal- if my 2012 Challenger RT has 400 ft/lbs. of torque, I can't feel it. Maybe it's the doggy 3.06 rear differential I got along with the 5 speed auto trans. I don't feel much power with this car until I rev it up past 4,500 rpm, maybe that's just a hemi thing. I'm used to General Motors V-8s with more torque right out of the gate.
I've only driven one 5.7 / A5 - that was before the 392 cam swap I did on a friend's car. Afterward, the next step was putting in the Blue Top solenoids to get the trans to respond better.

I didn't care much for the programming the A5 has in Dodge's applications. I have the same A5 in my 'Benz (and did the Blue Top AMG solenoid mods) and it feels way more responsive.

The A8 transmissions have more gear ratios and more gearing in the lower ranges over what the A5 had.

Peak torque in the (stock) 5.7 is @ 4,200 rpm and the engine runs out of breath 5,200 rpm (power peak). These short stroke engines like to rev.

IMO, the stock cam is what holds back the 5.7. Improve the breathing and this engine has potential

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post #35 of 41 (permalink) Old 06-09-2019, 05:45 AM
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Very true about the what posters said about the 5.7 vs the 6.4. I've had both and when you get into a 6.4 its amazing the additional power you notice - its a beast. More than enough for usable street power and your going to need a bigger set of tires at least in the rear to really take advantage of it. Hellcat? I can't imagine that much horsepower and to me unless you can use it - its a waste of money. I love the Hellcat don't get me wrong but … your paying a premium purchasing it, and paying for it daily and rarely can use its tremendous hp. Just my .02 - good luck.

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post #36 of 41 (permalink) Old 06-09-2019, 09:07 AM
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Hal- "IMO, the stock cam is what holds back the 5.7. Improve the breathing and this engine has potential"

I think you may be right on that. The only addition I have made to the RT is an AFE intake kit. The newest carbon fiber one I got, the tube is about six inches diameter at the airbox, and it curves in with a nice radius to the intake, so should be more airflow, we hope. The cone filter is humongo size, eight inches, and open on the ends as well, so should take in more air. I got the dry filter version. Will be cracking the car out soon so I'll see how it performs.
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post #37 of 41 (permalink) Old 06-09-2019, 09:09 AM
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Hal- "I have the same A5 in my 'Benz (and did the Blue Top AMG solenoid mods) and it feels way more responsive."

What year is your Benz, and tell me about the solenoid mods?
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post #38 of 41 (permalink) Old 06-09-2019, 11:37 AM
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Hal- "I have the same A5 in my 'Benz (and did the Blue Top AMG solenoid mods) and it feels way more responsive."

What year is your Benz, and tell me about the solenoid mods?
its an '01 Daimler had the A5 tranny in production from '91 through '12 models (many of the V12 and AMG models still used the A5 as it had greater torque capacity over the A7 that succeeded it.

The 2 solenoids (Modulating Pressure & Shift Pressure) used in AMG applications allowed faster / firmer shifts as well as quicker responses (downshifting and holding gear) during cornering, hard deceleration and harder acceleration over the standard ones.

The part # 240 270 00 89 for them. Various vendors sell these online.

It requires draining fluid, removing the valve body / conductor plate to install them
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post #39 of 41 (permalink) Old 06-10-2019, 07:53 PM
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I own a 2018 SP and have rented 2018 & 19 SXT, GT and RT in the past couple of months for work. (Very happy about rental companies having a selection of Challengers and Chargers). All are great drivers but, there is a big step up from the V6 to Hemi RT and a big performance jump thense to the 392. While I own SP, I could get along with the smaller RT hemi if I had gone that way. I also find the Charger to be easier to drive due to a higher view point. Challenger is not difficult but, Charger has better visibility over the hood and fenders.

I enjoy scrolling through the performance pages on the rentals. The Hemi RT registered a top speed of 158 and a sub 14 on the quarter timer. The GT registered 135 top speed and mid 14s on the quarter and, IIR, 5.1 on the 60 timer. People really "drive them like rentals". My timers all have the factory zero but, I won't mention my top speed in gentle company. The STX and GT rent for normal full size rates while the RTs may go a couple dollars more per day. Chatting at Enterprise while picking up a Challenger last month, I mentioned I try for the Challengers and Chargers to match controls of my car. Told the guy I drive a SP and he excitedly told me they charge $150 a day but they won't let him rent one - must be 25 or 26 for the RT and SP.
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post #40 of 41 (permalink) Old 06-10-2019, 11:36 PM
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Hal- how big a job for the mechanic to replace the two solenoids?
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