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Old 03-13-2010, 02:40 PM   #11 (permalink)
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...I wanna see that "equation' they use to derive "aero-HP" from chassis dynamometer-HP (wink,wink)!


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Old 03-15-2010, 06:30 PM   #12 (permalink)
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Quote:
Originally Posted by Frank Lee View Post
Why do rags never exploit dyno runs for fe testing? I need more info before I give street testing like this credibility
That's what I don't get!

These guys would never accept anything less than a time slip as "proof of performance" on a drag strip, but they'll do all kinds of nonsensical things when it comes to measuring MPG.

Domman: you're right - they deserve props for talking about fuel economy to a demographic that might look at you like you've grown a another head for raising the topic otherwise. Tuning for efficiency is only going to grow in stature, so we'll just have to hope that the quality of the info grows with it.
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Old 03-15-2010, 07:32 PM   #13 (permalink)
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They weren't malicious like Truck Trend anyway.
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Old 03-15-2010, 08:49 PM   #14 (permalink)
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Frank -

Quote:
Originally Posted by Frank Lee View Post
...

http://www.alcoa.com/car_truck/en/pd...vantage_cv.pdf

^This pdf has a graph that I didn't see how to grab and copy. It may be the best breakdown of this issue I've seen. It says a small car will see +4% fe with -10% weight. It says a small car with a resized engine could see +6.5% per -10% weight- an important distinction with "resized engine" being smaller displacement, optimized for the lighter weight. Between this and the Ford piece, I'd go with +3-4%/-10%. But that's certainly debatable.

...
Do you mean this? :



I did it with MSPaint :

1 - Scale the PDF to about 125% and get image front and center on screen.
2 - Press "SHIFT-PRNT SCRN" key combo
3 - Open MSPaint
4 - Press "CTRL-V" key combo
5 - Use "Select" tool to outline graph
6 - Press "CTRL-C" key combo to copy graph into memory
7 - Select "File->New" and don't save changes
8 - Make sure default "Image -> Attributes" width and height are smaller than the graph.
9 - Press "CTRL-V" key combo to insert outlined graph
10 - Save as JPEG

It's a lot of steps, but it will work on any Windows PC, *unless* the image has a way of protecting itself from being screen-captured (common with movies).

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Old 03-15-2010, 09:16 PM   #15 (permalink)
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Old 03-18-2010, 02:14 AM   #16 (permalink)
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Not to be cynical metroMPG, but I think that as more people become interrested in hypermiling the claims will get MORE extravagant. It the old snake oil, platinum oxidized, magnetized fuel. The main point of magazines is to sell advertisers products, not inform. Money from the advertisers and every rube who shells out six bucks a copy will keep them in the business of making money for years to come. This (look around) is the only format where honest debate, even if heated and confrontational at times, and learning about fe are happening.
Amory Lovins at the Rocky Mountain Institute has been advocating decoupling mass and size, and down powering for years. Almost all of the sites content is free, just like this one. The internet is source of information and the greatest source of misinformation at the same time, but I trust you all more than any rag that will contradict itself three times a year to keep circulation and advertising income up.
It's sort of defeatist and negative, but until their testing methodology matches yours during all of your testing I'll be dubious.

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