5.7 vs 6.4 Torque Curves - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 07-05-2013, 01:09 PM
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5.7 vs 6.4 Torque Curves

Does anyone know where I can find the torque curves for the 5.7 and 6.4 truck engines. I assume that the 6.4 would have slightly more bottom end torque but I'd like to see the curve.

Jim
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#2 Old 07-05-2013, 01:11 PM
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the 6.4 has a ridiculous amount more low end.

2013 Ram Laramie 4x4 hemi 8speed.
305 55 20 nitto trail grapplers, HBS 2.5
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#3 Old 07-05-2013, 02:39 PM
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Bottom End Torque

Mexi
The SRT 6.4 certainly does but I haven't seen anything on the truck motor.
More Torque is a good thing, NO ??
More Bottom end and Mid Range Torque is exactly what the Power Wagon seems to need. "NO Replacement for Displacement" ?
Not always I guess, Force feeding seems to be one alternative.

I don't own a Power Wagon (Yet) so this is a bit of a guess or assumption on my part.
Several owners have reported issues with transmission hunting (especially when pulling a grade or bucking a head wind).
I've also heard owners say that when pulling a trailer into the hills, they had to slow down, drop a few gears, spin the motor and watch the temp gauge.

Gods of the Ram, We needs MO Torque, Please Give us Sum Mo Torque.
Maybe our prayers have been answered.

Jim
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#4 Old 07-05-2013, 04:43 PM
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On my 07 PW the 4.56 gears help make-up for the the extra weight of the PW and provide peak hp and torque at the lower speed.

I have done some moderate towing lots of off-roading with a fully loaded truck and the Hemi does just fine. Personally I am very disappointed 6.4 numbers not much over the current Hemi.

Here are the comparison specs from allpar.com

[5.7 Hemi (2500 truck)]
Horsepower = 345
Torque = 375

[5.7 Hemi (2500 truck)]
Horsepower = 383
Torque = 400

[6.4 Hemi (2500 truck)]
Horsepower = 410
Torque = 429 (manual transmission is limited to 410 lb-ft torque)

2007 Quad Cab Power Wagon
Suspension: Carli 3" Hemi Coils | Carli Control Arms | Carli King 2.5 Pin-Tops | Carli Stainless Steel Damper | Synergy 1" Rear Shackle
Performance: Magnaflow Muffler | Magnaflow Y-Pipe
Wheels/Tires: Toyo ATII's 35x12.5x17
Steering/Drivetrain/Axles: Carli Front Diff Guard | Dynatrac Ball Joints | Redhead Steering Gear
Miscellaneous: EBC Front Slotted Dimpled Rotors | Line-X Bedliner | Locker Bypass Switch | Mopar Rock Rails | DieHard Platinum Battery G65 | Performance Friction Brake Pads | Weathertech Digital Fit Mats | Winch Thermal Protection Bypass

Last edited by coder; 07-11-2013 at 04:59 PM.
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#5 Old 07-05-2013, 05:56 PM
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Doesn't the 2009 power wagon have the 390 HP VVT engine?

2009 PW Inferno Red & 2011 Challenger RT
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#6 Old 07-05-2013, 06:54 PM
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Quote:
Originally Posted by sk8r View Post
Doesn't the 2009 power wagon have the 390 HP VVT engine?
Your are corrected about the year the HP it is lower in a 2500 VVT Hemi at 383 HP compared to a 1500 at 390...

2007 Quad Cab Power Wagon
Suspension: Carli 3" Hemi Coils | Carli Control Arms | Carli King 2.5 Pin-Tops | Carli Stainless Steel Damper | Synergy 1" Rear Shackle
Performance: Magnaflow Muffler | Magnaflow Y-Pipe
Wheels/Tires: Toyo ATII's 35x12.5x17
Steering/Drivetrain/Axles: Carli Front Diff Guard | Dynatrac Ball Joints | Redhead Steering Gear
Miscellaneous: EBC Front Slotted Dimpled Rotors | Line-X Bedliner | Locker Bypass Switch | Mopar Rock Rails | DieHard Platinum Battery G65 | Performance Friction Brake Pads | Weathertech Digital Fit Mats | Winch Thermal Protection Bypass

Last edited by coder; 07-11-2013 at 05:06 PM.
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#7 Old 07-05-2013, 08:22 PM
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i tell you this the 6.4 will put more out then 410

my stock 6.4 charger put 440 to they wheels lol

2013 Ram Laramie 4x4 hemi 8speed.
305 55 20 nitto trail grapplers, HBS 2.5
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#8 Old 07-06-2013, 11:15 PM
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Quote:
Originally Posted by MEXI View Post
i tell you this the 6.4 will put more out then 410 my stock 6.4 charger put 440 to they wheels lol
I'm sure the potential is there, auto makers usually de-tune heavy duty gas truck engines for reliability reasons.

2007 Quad Cab Power Wagon
Suspension: Carli 3" Hemi Coils | Carli Control Arms | Carli King 2.5 Pin-Tops | Carli Stainless Steel Damper | Synergy 1" Rear Shackle
Performance: Magnaflow Muffler | Magnaflow Y-Pipe
Wheels/Tires: Toyo ATII's 35x12.5x17
Steering/Drivetrain/Axles: Carli Front Diff Guard | Dynatrac Ball Joints | Redhead Steering Gear
Miscellaneous: EBC Front Slotted Dimpled Rotors | Line-X Bedliner | Locker Bypass Switch | Mopar Rock Rails | DieHard Platinum Battery G65 | Performance Friction Brake Pads | Weathertech Digital Fit Mats | Winch Thermal Protection Bypass
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#9 Old 07-10-2013, 11:15 PM
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Talking

The new 6.4 is not the same 6.4 in the cars. It's alittle different from what I read. It's a bored and stroked 5.7 truck motor.

I have an '08 PW, and I pull a 9,000 lb camper. When it comes to hills. I pull down a gear, and let the Hemi spin. The Hemi is a rpm motor. It don't like to be lugged.

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