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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis SPONSORED BY:

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  #31  
Old 07-01-2014, 04:00 PM
JR58 JR58 is offline
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Quote:
Originally Posted by parkland View Post
Yeah don't even try it on a stock truck, or tuned with DPF on.
Disaster could be the end result.

The 6.4 uses so much EGR that if you disable the turbo, the combustion will be severely lacking clean air, so it will gum everything up and probably run like absolute garbage.
The DPF on tunes control the air intake and EGR intake to burn clean, and if you disable the turbo, it will no longer do that, and likely the truck will run like junk for a short time until the DPF is destroyed.
On a tuned deleted truck, the engine is getting 100% fresh air, instead of EGR mixed air, so the truck runs decent without the turbo actuator hooked up.
One more time, don't mess with the turbo actuator if the DPF is on the truck, or the EGR is operating. Bad idea.
So let me sum this up: "Don't do that!"
I think I get the picture
Seriously, thanks for the heartfelt advice.
JM
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  #32  
Old 07-12-2014, 12:30 AM
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ZPI28 ZPI28 is offline
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I took my 35" mud tires off and put on some 285 AT 10 plys. Ill be making a trip to Texas next week and will hand cal my fuel mileage. Im still running stock with a SCT 120hp tune. DFP on still.
When I check my mileage after removing the mud tires I picked up almost 1.5 mpg.
My truck is a LWB DRW 4x4 King Ranch. Ill check back in after my trip next week.
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  #33  
Old 07-12-2014, 05:33 PM
wp6529 wp6529 is offline
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A lovely truck, looks like mine except mine is black. What axle ratio do you have? Larger tires = less rev / mile, so they would be expected to get you more mpg unless the axle ratio was already lower and they lowered the rpm too much.
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  #34  
Old 07-12-2014, 05:45 PM
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ZPI28 ZPI28 is offline
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Originally Posted by wp6529 View Post
A lovely truck, looks like mine except mine is black. What axle ratio do you have? Larger tires = less rev / mile, so they would be expected to get you more mpg unless the axle ratio was already lower and they lowered the rpm too much.
Ive got 4:10s.
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  #35  
Old 07-12-2014, 06:09 PM
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Hmm, 4.10 here as well. Should be plenty high for a bit larger tires and better mpg. Functionally equivalent to a lower ratio like 3.73.
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  #36  
Old 08-06-2014, 04:09 AM
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Originally Posted by parkland View Post
I think over 20 is possible, but depends how you drive.
Screaming down the road at 70 mph, no friggin way.

Mine has 3.73 gears, and I can get over 20 on highway trips.
Also stock wheels and tire size.

They say the best MPG a vehicle can get, is the slowest speed possible with the torque converter locked. This would be around 80 km/h.
I noticed when driving in BC with mine, most of the time I'm driving a lot slower than on the open roads of the prairies, and the fuel lasts a lot longer.

As much as I hate lowered trucks, a worthwhile investment might be putting airbags and new suspension on one of these trucks, so you could go say 4" lower than stock to 2" higher than stock.
Lowering it on the highway I bet is good for a couple MPG.

I don't believe a tuned 6.4 should have any problems to get great MPG. It's a common rail diesel just like any new diesel engine, and once the emissions junk is gone, I see no downside at all to owning one. In fact I think the 6.4 is actually a tougher engine than the 6.7, although the 6.7 is much nicer 100% stock for sure.
with 3:73 rear end I could do no better than 9+ mpg's towing a 6,400 lb. toyhauler on a 3400 mile round trip? I am suspicious of underated trailer tires and just plain old WIND being part the blame! but I passed people on grades like they were standing still! and my best unladen mileage was 17-18 mpg's on a 900 mile trip hand calc'd.
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Old 08-06-2014, 04:09 AM
 
 
 
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