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Old 03-06-2015, 02:19 PM   #121
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Update

Following my gut as well as some sound advice from several of you, we decided to stick with the truck we picked. We would just have too many regrets if we went with the 4x4 and other options we don't need or want.

There simply aren't ANY 4X2 Lariats available anywhere in Texas with the 2.7L Ecoboost at the moment -- it's a new and very rare breed. So, we worked out a plan with the dealer. He is going to rent us a truck for the trip with unlimited mileage on a 30 day rental. It'll be an F150 of the same size, but a V8 XLT. He refunded my deposit and is waiving the first month's payment, so the rental will wind up costing us a little under $200. Of course, it'll give us less mpg, but it's only one trip. They don't have 'demonstrators' or loaners when it comes to pickups, unless your vehicle is in their shop for repairs and it's short term.

I picked up an el-cheapo Reese Towpower controller for $29 so we will have trailer brakes on the way home. "Our truck" has been released from the factory and is awaiting shipment. It's scheduled to arrive in San Antonio on March 27th. When we get home we simply swap trucks.

Another crisis averted.
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Old 03-06-2015, 03:20 PM   #122
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"The 2015 4x2 2.7L Ecoboost will tow 8200 lbs". When the turbo is engaged?
"It'll be an F150 of the same size, but a V8 XLT." This will be a unique opportunity to compare to the 2.7 ecoboost after you take delivery.
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Old 03-06-2015, 03:31 PM   #123
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Quote:
Originally Posted by Jubal View Post
"The 2015 4x2 2.7L Ecoboost will tow 8200 lbs". When the turbo is engaged?
"It'll be an F150 of the same size, but a V8 XLT." This will be a unique opportunity to compare to the 2.7 ecoboost after you take delivery.
They don't quantify it for when the boost is engaged vs not engaged. You're right about the 'unique opportunity' thing too. It will be interesting to see real world number comparisons between the V8 and the 2.7L V6, with the same trailer and the same driver.
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Old 03-06-2015, 03:37 PM   #124
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Originally Posted by Jubal View Post
"The 2015 4x2 2.7L Ecoboost will tow 8200 lbs". When the turbo is engaged?
What does "engaged" mean for a turbo? Obviously, the towing capacity (and every other performance spec) assumes that the turbocharger is functional, along with every other part of the drivetrain.

The turbocharger is always spinning, and there is no driver control of its behaviour. This is not a mechnically driven supercharger with an on/off clutch like...
If you mean when it is producing boost, then it's going to do that whenever needed, and it's not going to boost under light enough load... both regardless of whether or not a trailer is attached.
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Old 03-06-2015, 04:18 PM   #125
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"no driver control of its behavior" ??
The turbo engagement or boost is in response to engine load and throttle position.
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Old 03-06-2015, 04:37 PM   #126
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Quote:
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"no driver control of its behavior" ??
The turbo engagement or boost is in response to engine load and throttle position.
Yeah, you can definitely get better mileage by slowing down and not stomping on it so it's not in boost as often. But similarly, you'll save gas by doing the same thing with a non-turbo engine.

There may be one difference though, and I plan to experiment with it once I get the truck: Some have reported that you should try to get up to speed more quickly with the Ecoboost, rather than gradually as with the non-turbo. The theory is that it's not in boost as long and the mileage is improved overall. Have no idea if that's true.
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Old 03-06-2015, 05:24 PM   #127
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Mileage

Quote:
Originally Posted by rbryan4 View Post
Yeah, you can definitely get better mileage by slowing down and not stomping on it so it's not in boost as often. But similarly, you'll save gas by doing the same thing with a non-turbo engine.

There may be one difference though, and I plan to experiment with it once I get the truck: Some have reported that you should try to get up to speed more quickly with the Ecoboost, rather than gradually as with the non-turbo. The theory is that it's not in boost as long and the mileage is improved overall. Have no idea if that's true.
We got over 15 mpg on our first trip with our new Ram truck when towing between 55 to 60 MPH . The mileage dropped to the upper 13's at speeds from 65 to 70 MPH . Driving like an old man. which I am, increases my gas mileage about 10 to 15%. It pays to be retired and not in a hurry.
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Old 03-06-2015, 06:52 PM   #128
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Originally Posted by Jubal View Post
"no driver control of its behavior" ??
The turbo engagement or boost is in response to engine load and throttle position.
Exactly. It is not engaged or disengaged directly by the decision of the driver, like Max pulling the red knob on his shifter. If getting 100 horsepower out of the engine uses the turbo, there's no way the driver can decide to get that 100 horsepower by using more open throttle and no turbo, even though the engine could produce that much power without a turbo... it's just going to what it is designed to do.

As a result, there are not different capacities for towing with and without turbo "engaged" - there's a capacity for the truck, which has a turbo, and uses it. A towing capacity without turbo use would make no more sense than a towing capacity with a 3000 rpm engine speed cap (with an engine that produces maximum power at 5750 rpm and runs safely well beyond that).

I suspect that if you hook any trailer to an EcoBoost F150 and manage to drive it without ever seeing any boost, you're probably holding up traffic pretty badly. Since these engines are intended to use significant boost even at moderate speeds, they probably end up running in boost at relatively low speed to produce the same power that the non-turbo V6 would produce by running at higher speed, so boost doesn't mean extreme operation. Even if the boost gauge shows vacuum, the turbo may still be boosting to some extent.


So it looks like the intent of "when the turbo is engaged" was "when driven in a way that causes the turbo to produce boost". That's called normal driving, so yes - 8200 lb when the turbo is "engaged".
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Old 03-06-2015, 07:03 PM   #129
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Originally Posted by rbryan4 View Post
Some have reported that you should try to get up to speed more quickly with the Ecoboost, rather than gradually as with the non-turbo. The theory is that it's not in boost as long and the mileage is improved overall. Have no idea if that's true.
Minimizing time in boost equates "boost" with "bad", and I see no reason for that. Maximum boost would likely mean that the engine management system will do things (in ignition timing and fuel injection timing, for instance) which compromise efficiency in favour of maximizing power output, and you wouldn't want that. Moderate boost, on the other hand, should be the mode in which the engine is designed to operate. Accelerating more quickly may improve overall economy because more of the energy produced by the engine comes in boost mode, not less... but we're just speculating here.

BMW did careful studies many years ago which showed that a typical (non-turbo) engine converted fuel to energy driving the car most efficiently at about 3/4 open throttle (and low engine speed), leading to a strategy of getting up to speed relatively quickly - while shifting early to keep the engine speed down - for best economy. Perhaps an EcoBoost engine shows a similar benefit when operated in moderate boost at moderate speed.

The BMW info was from memory, but in a quick Google search I found a brief reference: Popular Science, July 1981
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Old 03-06-2015, 07:15 PM   #130
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so the rental will wind up costing us a little under $200.

Another crisis averted. [/QUOTE]

Perfect, you save the wear and tear on your new truck and you will be able to deal with any new truck issues while around home. $200 well spent in my view.
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