EcoBoost 4 cylinder in Ford Flex

By Greg S.

My wife and I recently test drove a Ford Flex. We loved most things about the vehicle, but I have a few ideas on how to make it least in my opinion. The main one involves the EcoBoost 4 cylinder engine. A new direct injection turbo charged 4 cylinder engine in teh 2.0 to 2.5 Liter range should be capable of about 270Hp and 270ft-lbs of torque. This would be the powertrain of choice in the Flex, at least in my opinion. A turbo charged engine has two huge advantages over the NA V6, first it has a much flatter torque curve, and second it is forced induction. This engine couple with at least a 6 speed (maybe even a 7 speed transmission) should provide better fuel mileage and improved performance. The flat plateau torque curves of the turbo fours are wonderful! And what could be better than a vehcile that maintains power even at elevations!

The main reason we didn't buy this past weekend was the fuel mileage of the vehicle. Currently we have a 99 Saturn that gets an average of 31 mpg in mixed driving and a 09 VW Jetta TDI that maintains a 42+ mpg in mixed driving. Since my wife and I drive around 50 to 60 minutes to work each day in opposite directions, switching to a vehicle that would most likely net us an 18 mpg average on our drives just isn't in the cards...find a way to get us up to 23 to 25, and we're in!
Michael R 04/07/2012
Yes, a 4 cylinder Ecoboost engine would be perfect for the Flex
Greg S 06/24/2010
My wife and I already own a VW Jetta TDI, wonderful car that gets GREAT mileage. It has plenty of pep once up to speed, but is a bit sluggish off the line (combination or dual clutch tranny with turbo diesel power curve).... If Ford were to toss a 200HP turbo diesel with 300+ lb-ft I may be for teh tranny, a diesel in this size vehicle would require a 7 or 8 speed dual clutch...The power ban of the EU diesel engines simply isn't that wide (maybe 2.5k to 3k RPM), the extra gears are needed to keep the vehicle in its sweets spot during acceleration and still keep revs low during high speed cruising.

I know our Jetta would benefit from an extra gear...heck it would problably lead to at least a 4 or 5 mpg increase if we could drop highway revs 500 RPM.

I'm certainly not opposed to teh EU diesel (heck I've already got one...), but I believe it is more realistic to expect the Ecoboost 4 cylinder to find its way into the FLEX...since it is rumored to be introduced in the next Explorer which is built on the same platform. Just my 2 cents.
H Smith 06/02/2010
Would an EU type small displacement DuraTorq turbo diesel with a 6 speed dual clutch transmission work for you?