[tjts1]

Originally Posted by Vanner

Or what the article says, I didnt read it.

I made some pretty broad claims here, let me know if im wrong.

You should At least read the article. Auto speed has a series of articles on "eliminating negative boots" and "fordward facing intakes". They did the modification on a both NA and turbo cars including a honda Insight. Its all there.
As for my previous claim, I followed the Autospeed articles to the letter. i installed large sealed forward facing intakes on 3 cars. 2 volvos that originally had thermostatic variable hot/cold intakes, and 1 BMW that simply breathed all its air from inside the engine bay near the radiator. On the bmw i was able to to measure the temperature drop from 20-40f above ambient stock down to 0-5f above ambient.
http://www.matthewsvolvosite.com/airbox.php
M42club.com - Home of the BMW E30/E36 318i/iS - View Single Post - Looking for cold air intake

Originally Posted by garys_1k

Reducing upstream restrictions just means you'll hold the throttle closed more, and increasing upstream restrictions means you'll hold the throttle open a bit more. The end result is the same.

No, thats not how it works. The engine will still breath the same ammount of air and have the same intake if you increase air pressure, reduce throttle angle and maintain the same load. Take the engine up to 30k feet where it can only produce 30% as much power at WOT and it will still consume the same amount of fuel at the same load.
[QUOTE=garys_1k;39268]

Originally Posted by garys_1k

Back in my max. HP days I played with that sort of ram air, but just like the equations say, there's pitifully little pressure available from forward speed until you exceed about 90 mph. In any case, for hypermiling, it's a waste of time.

Read the autospeed articles. Its not about pressure, its about reducing restriction. The large forward facing intake improves fuel economy by making the engine a more efficient air pump at low RPM and high load. This will allow you to use 1 or 2 gears higher at any given load.


HAPPY READING
Eliminating Negative Boost - Part 1
http://www.autospeed.com/cms/A_0629/article.html
Eliminating Negative Boost - Part 2
http://www.autospeed.com/cms/A_0637/article.html
Eliminating Negative Boost - Part 3
http://www.autospeed.com/cms/A_0646/article.html
Eliminating Negative Boost - Part 4
http://www.autospeed.com/cms/A_0652/article.html
Eliminating Negative Boost - Part 5
http://www.autospeed.com/cms/A_0663/article.html

Negative Boost Revisited, Part 1
http://www.autospeed.com/cms/A_107824/article.html
Negative Boost Revisited, Part 2
http://www.autospeed.com/cms/A_107825/article.html
Negative Boost Revisited, Part 3
http://www.autospeed.com/cms/A_107826/article.html
Negative Boost Revisited, Part 4
http://www.autospeed.com/cms/A_107827/article.html
Negative Boost Revisited, Part 5
http://www.autospeed.com/cms/A_107828/article.html

Doing the Impossible
http://www.autospeed.com/A_109877/cms/article.html

Modifying the VL Turbo Intake
http://www.autospeed.com/cms/A_0779/article.html

Into the Intake - Part 1
http://www.autospeed.com/cms/A_1361/article.html

We Have a Record!
http://autospeed.com/cms/article.html?&A=109217