Variable Valve timing advantage?
Variable Valve timing advantage?
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Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
As I rub my magic crystal ball, I see ... ONE mpg! LESS! Or is it more?
Just kidding, but you get the idea - it's 5.4 liters, about the only thing that may help MPG is exhaust back pressure but we all know they have to have some, there is a noise limit. The key is that the motor can get MORE air/fuel making more power. And using more gas. The less back pressure, sure the less resistance on the exhaust stroke, but also, the more air it can ingest in the intake stroke, thereby using - you guessed it - MORE GAS.
I think it'll be a toss-up, and hopefully, it will get the same MPG but I doubt it will improve much.
Just kidding, but you get the idea - it's 5.4 liters, about the only thing that may help MPG is exhaust back pressure but we all know they have to have some, there is a noise limit. The key is that the motor can get MORE air/fuel making more power. And using more gas. The less back pressure, sure the less resistance on the exhaust stroke, but also, the more air it can ingest in the intake stroke, thereby using - you guessed it - MORE GAS.
I think it'll be a toss-up, and hopefully, it will get the same MPG but I doubt it will improve much.
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Joined: Dec 2001
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From: Louisville,Ky.
They get better mileage than the 97-03 5.4's. They are more efficient and more powerful at the same time. The VVT along with the flaps in the intake to increase velocity at low rpm's really helps torque. This means less pedal is needed to accelerate so less fuel is used.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by LxMan1
They get better mileage than the 97-03 5.4's. They are more efficient and more powerful at the same time. The VVT along with the flaps in the intake to increase velocity at low rpm's really helps torque. This means less pedal is needed to accelerate so less fuel is used.
Not that I doubt the MPG gains you say, but I still think it's going to take the same fuel to move the same weight with the same displacement...
How MUCH better mileage?
art k.
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Joined: Dec 2001
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From: Louisville,Ky.
My 01 5.4L 4x4 gets around 14mpg. My friends new 04 4x4 5.4L (both with 3.55 gears) gets 17.5mpg. That adds up over a year @ $2.00 a gallon!!
That is true about the drive-by-wire TB. But it must be more efficient. 3.5mpg is a 25% improvment!!!
That is true about the drive-by-wire TB. But it must be more efficient. 3.5mpg is a 25% improvment!!!
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