Thread: Two overdrives?
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Old 04-29-2011, 09:21 PM   #37 (permalink)
t vago
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Quote:
Originally Posted by cleanspeed1 View Post
Let me explain real world experience to you.
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.

Quote:
Originally Posted by cleanspeed1 View Post
What's the lowest numerical ring and pinion that you can get that will fit both the axles?
It looks like I can easily get a 3.23 diff. Why should I downgrade my towing/hauling capability?

Quote:
Originally Posted by cleanspeed1 View Post
Or if you don't uses the 4x4 feature, disconnecting the driveshaft to the front axle and using a different ring and pinion in the back only?
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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