Quote:
Originally Posted by t vago
Feel free to go off your theory, because that's all it is. You haven't designed anything if you merely fixed it. Bringing a vehicle up to its designed operating condition is not the same as modifying it for whatever purpose one had in mind. I could quote ASE study guide material too, but it won't help one bit. This is exactly the in-the-box thinking that prevents people from trying new ideas. So much for nefarious control freaks that kill inventors and suppress new developments - it's rather people like you who refuse to consider anything outside of what they understand.
I got 23 MPG once on a "high-speed" run from Canton to Detroit last year, and I commonly get about 19.5 MPG per tankful. That's with a "propensity for high speed." This is remarkably high for a "big, heavy, high powered, high drag vehicle with high frictional losses in the driveline and high road friction because of the tires." Tell me approximately how much loss I'm experiencing in my driveline. Tell me how much more loss I could expect with installing an overdrive. And tell me what happens to bsfc when you choke the living hell out of a "high powered" gasoline engine, such as driving down the interstate at 72 MPH and getting a manifold vacuum of around 7 or 8 psig.
Here's the thing. I'm much more inclined to listen to whatever Big Dave and comptiger5000 have to say, because they at least put out the effort to experiment and find out what worked, and what could be improved. You? Not so much.
It looks like I can easily get a 3.23 diff. Why should I downgrade my towing/hauling capability?
Notwithstanding the fact that I have a 2WD truck, why would I want to cripple a 4x4 vehicle in this manner?
Not that I really expect you to answer...
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I'll answer, it's not as if I'm afraid to, because despite you getting personal, I'm going to keep it technical.
If you are getting 20-23 mpg in a heavy pickup with 4x4 at 70+ mph, congratulations and more power to you.
Are you using the stock programming in the motor?
Are you using the stock wheel and tire sizes and the same ride height?
If someone else were to drive the truck, could they produce the same mpg result as you?
Did these results come from using standard E10 pump gas fuel?
Were there any fuel additives added?
The numbers generated, were they from a Scan Gauge or some other device that can measure the fuel consumption or were they done by hand, and what proves their accuracy?
I can get behind Big Dave because I have owned Powerstrokes and with the type of powercurve they have, the fact that it's a diesel ( and a big one at that ), their tuneability and the fact that if you slow them down they won't lug.
So, back to the original topic. You should go ahead and spend the money and get that GV installed.