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Old 09-20-2009, 03:54 AM   #11 (permalink)
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57.9% increase in fuel economy (last paragraph) !

Detroit will be knocking this guy's door down to get the "secret"!

Pete.

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Old 09-25-2009, 03:36 PM   #12 (permalink)
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yeah there are all these super easy ways that GM could be making their cars get 60mpg, they're just too stupid to figure out stuff that guys in garages with little pvc pipes throw together in one afternoon!

And sure they would sell more cars than anyone else on the planet if they just dusted off all the top secret technology they're obviously sitting on to make cars get 300mpg, but they figure they'll just roll around in bankruptcy land on purpose for giggles.
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Old 05-03-2011, 10:44 PM   #13 (permalink)
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Ram Air Intake Scoop

I installed a ram air intake scoop on my four wheel drive 2004 Toyota Tundra Double Cab a few years back. Changes I recorded:
  • 1.5-2 MPG increase depending on driving conditions
  • Truck stopped downshifting on hills
  • Better passing power from 50 to 90 MPH

The ram air intake scoop gathers and forces somewhere in the area of 11 times more air than the engine can ingest at 70 MPH.

There is a website that claims mounting a ram air intake scoop below the bumper places it in a region of negative pressure or vacuum but this does not hold true for my truck. Using a homemade manometer I recorded 3.5 water inches of pressure in this area running the highway at 70 MPH. The scoop connects directly to the stock air box with a True Flow drop in-filter.

I have never been able to draw (or force) water up into the air box or engine - even in driving through six inches of standing water. I would not have done this deliberately but I was trapped in my lane with nowhere to go.

I had pictures to post but they are too big. I would provide links to the pictures but I have not made five posts yet.

Last edited by highwaylizard; 05-03-2011 at 10:48 PM.. Reason: Pictures did not post
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Old 05-03-2011, 11:39 PM   #14 (permalink)
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From someone who has fitted a ram air system to a V6 FWD, yep it makes a difference.

And with small displacement motor, and the air only entering through the ram air vents, you damn well better believe you'll feel 300-400CFM being pulled in at WOT. Its pretty close to a small air blower that would be used in a home hvac system...the kind that moves air from your heater throughout your house.
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Old 05-04-2011, 12:15 AM   #15 (permalink)
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I really hate to ask this.......but the evil spirit in my brain demands it........

WHat 'simple' person would run their vehicle at WOT long enough for it to matter??????

Please........stop.
really.

If you are legitamately here for mpg, why would you care!!!!!????
I have the baddest sedan on this site. V8 w/ 340hp Tons of torgue, 3800 lb curb weight. sub 6 second 0-60 from the factory.
in 230,000 I have been at wot 1 time. And that was to scare the crap uot of my then 17 yr old daughter.
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Old 05-04-2011, 12:21 AM   #16 (permalink)
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I actually go WOT on occasion. Or full pedal, as it were. Many of the people here are also engine performance enthusiasts. Its a pretty large field of oberst and expertise on this site, and fuel economy is just a common factor between us all, or most of us.
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Old 05-04-2011, 12:48 AM   #17 (permalink)
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Quote:
Originally Posted by mcrews View Post
I really hate to ask this.......but the evil spirit in my brain demands it........

WHat 'simple' person would run their vehicle at WOT long enough for it to matter??????

Please........stop.
really.

If you are legitamately here for mpg, why would you care!!!!!????
I have the baddest sedan on this site. V8 w/ 340hp Tons of torgue, 3800 lb curb weight. sub 6 second 0-60 from the factory.
in 230,000 I have been at wot 1 time. And that was to scare the crap uot of my then 17 yr old daughter.
Not sure if you are referring to me or not. At any rate - do you define WOT by zero vacuum or by Throttle Position?
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Old 05-04-2011, 12:54 AM   #18 (permalink)
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I would like to ask if you have any sets of data or repeatable testing protocols from which we can make our own inferences?

And I'm fairly certain he didn't mean you.
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Old 05-04-2011, 12:56 AM   #19 (permalink)
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Also - WOT is normally defined as the throttle setting wherein the throttling device poses the least possible (unmodified) restriction to intake flow. Normally, when the skinny pedal is on the deck.

Zero vacuum can be achieved under any throttle setting, and thus, is a function of load, rather than throttle.
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Old 05-04-2011, 03:24 AM   #20 (permalink)
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Ram air is a misnomer (thank you GM marketing) but a large forward facing intake helped improve FE on 3 cars so far vs the stock intake setup. There is less down shifting involved in normal driving and I can use WOT or near wot in high gear at low RPM more often. The tradeoff is that the airbox accumulates more dirt.

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