Power compared to 6.4? - Ford Powerstroke Diesel Forum
6.7 Performance Parts Discussion 6.7 Performance Parts Discussion

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post #1 of 88 Old 10-18-2012, 03:25 PM Thread Starter
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Power compared to 6.4?

I was looking at a new 6.7 and I've seen post about the 6.4 blowing it away after both being slightly modded Is this true?


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post #2 of 88 Old 10-18-2012, 06:24 PM
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Originally Posted by Mwhitt002 View Post
I was looking at a new 6.7 and I've seen post about the 6.4 blowing it away after both being slightly modded Is this true?


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Stock 6.7 is way better power and fuel economy then a 6.4

Modded. 6.4 makes more power then a 6.7. The 6.7 runs out of fuel and air and has a weaker turbo then a 6.4

But I wouldn't trade my 6.7 for any 6.4

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post #3 of 88 Old 10-19-2012, 12:40 AM
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Originally Posted by Mwhitt002 View Post
I was looking at a new 6.7 and I've seen post about the 6.4 blowing it away after both being slightly modded Is this true?


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Stock the 6.7 is a better truck in every way shape and form. Modded the 6.4 is a more powerful reliable motor, but that is it. Creature comforts on the 6.7 are awesome. LCD "productivity" screen in dash is awesome!

So it's all up to what you want the truck for. If I was planning on a 40ft 5er I would have bought a 6.4 with 4.10 gears. but I am looking at 30-34ft 5er's so the 6.7 with 3.55's was what fit my bill the best.

If you want a really fast truck to race in, get a 6.4:

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post #4 of 88 Old 10-19-2012, 03:31 PM
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What a modded 6.4L gets you is almost 1/3 more torque. It's not about racing, it's about unrelentless and non stop torque when towing or just stepping on the gas at 60+. Nothing the 6.7L can or will do without at least 15K worth of mods can equal a 6.4L. The 6.4L is king, and that's indisputable.

Having said that, the 6.4L is history. I'll be downgrading to a 6.7L this summer because it's time for a new ride.

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post #5 of 88 Old 10-19-2012, 03:44 PM
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Originally Posted by George C View Post
What a modded 6.4L gets you is almost 1/3 more torque. It's not about racing, it's about unrelentless and non stop torque when towing or just stepping on the gas at 60+. Nothing the 6.7L can or will do without at least 15K worth of mods can equal a 6.4L. The 6.4L is king, and that's indisputable.

Having said that, the 6.4L is history. I'll be downgrading to a 6.7L this summer because it's time for a new ride.
I actually agree with Mr C.

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Originally Posted by BIG Laing View Post
Stock the 6.7 is a better truck in every way shape and form. Modded the 6.4 is a more powerful reliable motor, but that is it. Creature comforts on the 6.7 are awesome. LCD "productivity" screen in dash is awesome!

So it's all up to what you want the truck for. If I was planning on a 40ft 5er I would have bought a 6.4 with 4.10 gears. but I am looking at 30-34ft 5er's so the 6.7 with 3.55's was what fit my bill the best.

If you want a really fast truck to race in, get a 6.4:
I wrote this ^ wondering what Mr C. would say to it.

The 6.7 internals can't handle the shear power a 6.4 can.

But spend 2-3K on deletes and tuner and the 6.7 IMHO is better over all, as long as you arn't going to treat your truck like chit.

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post #6 of 88 Old 10-19-2012, 03:47 PM
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Whats the stock hp/torque ratings of the 6.4?

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post #7 of 88 Old 10-19-2012, 03:53 PM
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Originally Posted by 6.0f250firstcar View Post
Whats the stock hp/torque ratings of the 6.4?
6.4 is 350/650

6.7 is 400/800

6.7 has the 6 speed automatic too! (better for towing, and fuel eco.)

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post #8 of 88 Old 10-19-2012, 04:01 PM
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Originally Posted by BIG Laing View Post
I actually agree with Mr C.



I wrote this ^ wondering what Mr C. would say to it.

The 6.7 internals can't handle the shear power a 6.4 can.

But spend 2-3K on deletes and tuner and the 6.7 IMHO is better over all, as long as you arn't going to treat your truck like chit.
I've never raced my truck, and I can honestly say that I never floored it from a dead stop and let it run the gears. I am convinced that the transmission would not handle the power while adjusting, and I wasn't about to test it. In fact, I am sure something in the driveline would break because there was simply to much wild power along with jolting shifts. Honestly, you don't need to start off hot to destroy another truck or car, just ease in to it..
I've never had a breakdown because I have always respected that the truck was not designed for a 1,200lb engine. I drive it like an old man, but tow with it like an animal. When you have 12K hooked and your EGTs are still cool, and you know there still isn't much out there that can stay with you on an interstate, you are king.


Correct me if I'm wrong, but I think stock 6.4L torque was 720.

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Last edited by George C; 10-19-2012 at 04:04 PM.
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post #9 of 88 Old 10-19-2012, 06:00 PM
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Stock for stock, 6.7

Modded, 6.4
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post #10 of 88 Old 10-19-2012, 06:14 PM
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Originally Posted by Moto2four View Post
Stock for stock, 6.7

Modded, 6.4
for now. I think if the 6.7 remains in production, they will fix a few weak links. And with time and more understanding, tuning will become better on the 6.7.

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