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welcome to the site svtjackal, I'm Harley#356 from LR/NLOC/NHTOC/etc.
I would have bought a 3.5 EB Raptor in a heartbeat if it was an optional engine.
Excatly. Everyone jumps on the ecoboost bandwagon thinking they will get better MPG's but thats not the case. In the real world (not EPA ratings) the 3.5 ecoboost gets the same MPG's as the 5.0.I love reading all the 'new and superior tech' and 'antiquated ****' postings - nothing like hanging a giant flashing sign that says "I know exactly zero about what I'm typing..."
First - 'new and superior'
the 'things' that make the eco 'eco' are direct injection & turbo's on a gas engine - well that is neither new nor revolutionary. In fact, GM has been doing it for several years... They designed the architecture for it in the 90's and were first to market, several years ahead of Ford (03 for overseas and 07in the states (which is when the twin-force Ford hit the streets). The only thing Ford has been more successful at (WRT the eco) is the marketing. GM's ecotec powerplants deliver higher power per liter numbers and very good mpg rates as well - and GM was at least smart enough to give them forged pistons. The first examples of direct injection occur in 1925... So much for cutting edge.
Gallery - ecotecpower.com - the ecotec enthusiast site
Second - 'antiquated ****'
let's look at the sum of their parts...
eco
twin independent variable cam timing
twin turbochargers
direct injection fuel system
tuned composite intake manifold.
forged crank
powdered rods
hyper pistons
piston cooling jets
aluminum 4v heads
aluminum block
6 bolt mains
6.2
Dual equal variable cam timing
Tuned composite intake manifold
cast aluminum pistons
Piston cooling jets
forged steel rods
cast iron crank
Iron block, 4 bolt mains with additional side bolts
aluminum 2v heads
it's as if one was made by a caveman, the other by aliens
knowing that adding 1 atmosphere (14.7 psi) effectively doubles an engines displacement...
3.5x2 (at 15psi peak) = 7 liters = 365hp/420tq
6.2 liters = 411hp/434tq
3.5tt = 5500lb truck, lifted on 35's gets 12-14 mpg
6.2 = 6000lb truck, lifted on 35's gets 12-14 mpg
staggering how underwhelming the eco is with it's alien technology.
Turbo Tech - Terminology, Overview - Science & Selection - Hot Rod
the reason ecoboost trucks get better mpg's is because they are significantly lighter, so the engine doesn't need to be 'in boost' to move the truck around. the heavier the truck, the more rolling resistance and the larger the front profile, the more the eco will need to be 'in boost' to move. more time in boost means less mpg's - it really is that simple. This has been proven as fact time and time again.
Look up 'lifted eco mpg' and you will find a giant thread on the f150forum that clearly shows dozens and dozens of eco's that dropped 5-8mpgs when adding a lift and larger tires.
there are some common truths in the automotive performance community - the eco does not outperform the 6.2, honda's with fartpipes are not fast, there isn't a hemi in your Dodge.
I heard from a knowledgeable source that Fox is pushing Ford to use their new 3.0's on future Raptors. It makes sense for Fox as they would need to keep making both. Ford has certain price-points to meet so I was told that this is far from a done deal.