Finally drove a 6.4 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 05-30-2007, 08:36 PM Thread Starter
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Finally drove a 6.4

I decided to take a 6.4L for a spin today and I was pretty impressed overall. It took a while for the nose to grow on me, but the interior is pretty sweet. While the 6.4L is a nice improvement over my '06 6.0L, I wasn't "blown-away" with itís performance. The one thing I really liked was the "light" steering effort. It's about time Ford got that right. According to my fleet sales connection, he is getting around 14/15 mpg on the highway, which is right around what I'm getting around town with my 6.0. According to him, the dealer's Ford rep. told him the mileage should get better once the truck gets over 10,000 miles. The rep. told him that Ford programs the 6.4L to run a little rich for the first 10,000 to help "break it in". After exceeding 10,000 miles, the program is adjusted by the computer to deliver better mileage, via using less fuel. I don't know if I believe all that though. Seems a bit of a stretch.

Anyways, maybe I'll look again next year when all the bugs are worked out.
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post #2 of 10 (permalink) Old 05-30-2007, 10:48 PM
 
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most of the bugs are worked out from what i here . and did you like how the twins worked , becauce ive herd you cant realy feel the improvment over the single turbo of the past years
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post #3 of 10 (permalink) Old 05-30-2007, 10:52 PM
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Yea the improvement is in the takeoff,this truck get outta the gate alot better than my 6.0 did.

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post #4 of 10 (permalink) Old 05-30-2007, 11:30 PM
 
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I don't think there are any bugs to be worked out at this point. The first time I drove the demo at the dealer I wasn't impressed with the acceleration either. Especially against my 7.3 with 4.30 gears.

Now that I own one I've had to adjust my driving style. On Saturday past I went to get some pizzas and came up to a light. It changed as I approached so I stepped it down a little and the truck just rocketed across the intersection. I couldn't believe it.I've come to realize that this truck does have a lot of power. I find I just have to drive a little differently.

The more I drive this truck the more I like it. I keep looking for excuses to go somewhere.
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post #5 of 10 (permalink) Old 05-31-2007, 01:51 AM Thread Starter
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Quote:
Originally Posted by mackb61
most of the bugs are worked out from what i here . and did you like how the twins worked , becauce ive herd you cant realy feel the improvment over the single turbo of the past years
The twins work pretty well. Off the line acceleration was kind of like my 6.0L- not instant power, but the power "came on" lower in the RPM band than my 6.0L. The powerband of the 6.4 is different than in the 6.0L. Overall it seems like a nice engine, it's just a shame that all the extra/new emissions crap had to be added, but I can understand the reasons behind it.
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post #6 of 10 (permalink) Old 05-31-2007, 02:07 AM
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I've heard some people complain about terrible lag, that the turbo doesn't spool until 2000rpm and other people say they run great :shrug: I guess I just need to go drive one.

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post #7 of 10 (permalink) Old 05-31-2007, 06:28 PM Thread Starter
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Originally Posted by FordRacing200
I've heard some people complain about terrible lag, that the turbo doesn't spool until 2000rpm and other people say they run great :shrug: I guess I just need to go drive one.
Yeah, I've read the same conflicting posts from other members too. Don't get me wrong, there is some lag off the line, but nearly as bad as my 6.0L. After driving the 6.4, it was obvious that the 6.4 and 6.0 are two completely different animals. For example, with my 6.0, if I mash the pedal, there is a prolonged (1 to 1.5 seconds) delay in "positive" engine response, until about 1600 RPM, then the turbo kicks in and she takes off. With the 6.4, when I hit the gas, I noticed a brief delay that was quickly followed by a smooth/steady/linear increase of power.
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post #8 of 10 (permalink) Old 05-31-2007, 10:15 PM
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I think it mostly depends on altitude...the higher you go, the laggier it gets..thats been the case for years with turbo'd vehicles.

Go Greyhound, and leave your luggage with us. *maybe not intentionally*
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post #9 of 10 (permalink) Old 05-31-2007, 10:25 PM
 
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i just need to go drive my grandpas i gues
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post #10 of 10 (permalink) Old 05-31-2007, 10:34 PM
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Take it for a spin and do your own little experiments.

Go Greyhound, and leave your luggage with us. *maybe not intentionally*
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