6.4 or 6.7? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 11-20-2011, 06:41 PM Thread Starter
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6.4 or 6.7?

I have a 08 crew cab dually, 2 wheel drive, RCD 450 tune, intake, 5" exhaust. I could have the opportunity to buy a 6.7, so I'm tryin to get a list together. Here it is

afe intake, stage 2 or that magna force?

Prolly go with 5" exhaust

Reading alot about h&s on these trucks, is there any other tuner to consider?

The trucks a crew cab 2 wheel drive, single rear wheel, how much better will it run then my 08?

How much difference is there, as far as power goes, in having dual wheel versus a single?

what can these transmissions hold compared to the 6.4 trans?

any help, suggestions, advice is greatly appreciated, thanks

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post #2 of 21 Old 11-20-2011, 07:09 PM
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Quote:
Originally Posted by SixNine View Post
I have a 08 crew cab dually, 2 wheel drive, RCD 450 tune, intake, 5" exhaust. I could have the opportunity to buy a 6.7, so I'm tryin to get a list together. Here it is

afe intake, stage 2 or that magna force?

Prolly go with 5" exhaust

Reading alot about h&s on these trucks, is there any other tuner to consider?

The trucks a crew cab 2 wheel drive, single rear wheel, how much better will it run then my 08?

How much difference is there, as far as power goes, in having dual wheel versus a single?

what can these transmissions hold compared to the 6.4 trans?

any help, suggestions, advice is greatly appreciated, thanks

Well, I had an 08 6.4 and power wise, the 6.4 doesn't even compare to the new 6.7! Not to mention the way better fuel economy that I have experienced with the 6.7 compared to the 6.4,

and to your question about single rear wheels compared to a dually, my opinion is if your always towing gooseneck or 5th wheel trailers duallys are the way to go. I have single rear wheels on mine and it does not struggle one bit towing a loaded 28ft stock trailer though.

About the programmers, I myself just ordered the h and s mini maxx because of all the good things and cecommendations I received about them.

And to your question about the 6.7's tranny I prefer the tow haul mode in drive "D", and the ability to shift through the gears in the manual mode "M" when towing.



'11 F250, 6.7 PSD, 3.55 gears, FX4 CC,SB,KR,5% tint, Hankooks w/ moto metal 959's, B&W hitch
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post #3 of 21 Old 11-21-2011, 04:12 AM
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Stock to stock, go with the 6.7L.
After that, the 6.4L is twice the engine.
The 6.7L lacks miserably in lift pump potential, fuel flow potential and boost potential.
You can easily dial up 600/1,200 power numbers with the 6.4L, the 6.7L does not have the hardware to touch the 6.4L in any way when tuned.

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post #4 of 21 Old 11-21-2011, 09:58 AM
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Stock to stock, go with the 6.7L.
After that, the 6.4L is twice the engine.
The 6.7L lacks miserably in lift pump potential, fuel flow potential and boost potential.
You can easily dial up 600/1,200 power numbers with the 6.4L, the 6.7L does not have the hardware to touch the 6.4L in any way when tuned.
The. 6.4is faster so far, bu for the 6.7 with the H&S were seeing ~500 hp ~1100 torque on just the hot tune with a .88 nos jet ,~600 and 1250-1300 trq. But it runs out of air and fuel at that point as far as I've tested, yet I'm no pro.nor do I work for H&S when I say we I mean my own shop.
I was thinking of buying another truck and leaving my tuned one with NADP to ramp it up a bit and do some beta testing. I think a new intake manifold and turbo, combo plus a bit more fuel it will put out more

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post #5 of 21 Old 11-21-2011, 04:19 PM Thread Starter
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Thanks guys, this does help, still stuck, I have my truck the way i want, but i really think the 6.7 could make power with more time, if I keep my 6.4, then it'll get alot more power, if not I'll have to settle with the 6.7 until more power is available, thanks again
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post #6 of 21 Old 11-21-2011, 04:20 PM Thread Starter
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Matty, I reckon your runnin the H&S on the hot tune? Can you pull with that tune? Hows the trans act?
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post #7 of 21 Old 11-23-2011, 03:43 AM
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Quote:
Originally Posted by SixNine View Post
Thanks guys, this does help, still stuck, I have my truck the way i want, but i really think the 6.7 could make power with more time, if I keep my 6.4, then it'll get alot more power, if not I'll have to settle with the 6.7 until more power is available, thanks again
The 6.4L is gone, but make no mistake, the 6.7L will never stack up.
You will have to change a multitude of expensive, and yet-to-be developed parts just to equal the hardware that came stock from Navistar on the incredible 6.4L.
That's no BS, that's just the way it is..

I always trade at three years, but I am holding on a little longer until more parts come available for the 6.7L. Once you've had real power, it's hard to go backwards.

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post #8 of 21 Old 11-23-2011, 04:06 AM
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If you want a rock solid DD/Tow rig that makes great power and gets excellent mileage go 6.7. If your goal is to run it at the track and nothing more stick with the 6.4.

But George always forgets. It was 2 years in before 6.4 tunes were making decent reliable power.

What the 6.7 lacks in air is already being made up for with twin kits.

IMO George should just by the POS Dmax hes been pining for for the last 2 years

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2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
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post #9 of 21 Old 11-23-2011, 05:15 AM
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Quote:
Originally Posted by Dave View Post
If you want a rock solid DD/Tow rig that makes great power and gets excellent mileage go 6.7. If your goal is to run it at the track and nothing more stick with the 6.4.

But George always forgets. It was 2 years in before 6.4 tunes were making decent reliable power.

What the 6.7 lacks in air is already being made up for with twin kits.

IMO George should just by the POS Dmax hes been pining for for the last 2 years
Dave, they twin turbo kits for the 6.7?


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post #10 of 21 Old 11-23-2011, 05:22 AM
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Just outta curiosity, why did Ford go from the 6.4L to the "Scorpion?"

Larry
2015 F-350 CCLB DRW, Lariat Ultimate,
2nd Gen. 6.7L "Scorpion" Turbo Diesel,
440HP/860TQ, Torque Shift 6-speed,
Tuxedo Black W/Charcoal Black Int.,
14,000 LB GVWR,
3:73 Gears W/Limited Slip,
17" Polished Forge Alum. Wheels,
BFG All-Terrain Tires,
Factory 5th Wheel/Gooseneck Prep Pkg.,
Spray In Bed-Liner,
Supplemental Cab Heater,
Camper Pkg.,
Chrome Pkg.,
FX4-Off Road Pkg.,
Upfitter Switches,
Engine Block Heater,
9025 Lbs. on the CAT Scales.

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