Oh, BS. It was a gimmick that someone made a bunch of money on, thanks to advertising and a lot of people with no common sense.

Sorry. But I’m not buying into any of this “spinning air” in the induction system as having any effect on a MPG or performance increase.

So what if you get the air spinning prior to (up to 2’ away) the throttle body?
Do I think it’s still spinning when it gets there? No.
Do I think it keeps spinning after going through the throttle body? No.
Is the air flowing at the same rate and in the same direction when it gets to the injector and intake valve, regardless of what you do to it upstream? Yes.
So what’s the point in making it spin prior to that point?
The only effect I can see in spinning the air that far up the induction system is to separate the dust out of it that the filter may not have caught. If that’s the case, you need a better filter.

Sure, a turbocharger may be more efficient if the air is moving into the turbine at a specific angle. But is it that critical? No. If it was, the manufacturers would have built the inlet to the turbine (cold side) with inlet guide vanes. Ever seen one like that? I doubt it. I know I haven’t.
And with the flow rate ever changing, what’s the point in that anyway? They would have to variable inlet vanes, and that’s not going to happen any time soon (if ever).

With all cylinders pulling air. There’s no way that air is going to maintain a circular flow through a (often corrugated) tube for any length, much less around the bends that most systems have today. And if it did. So what? It wont be after it hits the throttle body.

Go buy one of these devices. Better yet, just make one out of a piece of poster board. Run by Home Depot and pick up a 24” piece of clear tubing/pipe. Mount it on the end of the pipe and your vacuum to the other. Turn it on and blow some smoke into it. Note what you see the smoke/air doing (flow) a foot from the gadget. Now remove the thing and repeat. Note any difference in flow pattern a foot away? No.
How do I know this? I’ve seen it done before, more than once.
Air movement (like any other fluid movement) wants to take the path of least resistance. And that happens to be STRAIGHT to (or away from) whatever is making it move.

The only thing (air related) that helps increase performance is the amount of said air getting into the cylinders. That’s why we see cars running around with turbochargers pumping more air in, and inner-coolers cooling the air to increase its density. It’s all about volume. Not how we can get it spinning upstream.

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1980 300D - Veggie Burner !

So he has one in between the turbo and the intake manifold??? If the one before wasn't pointless, that one is. The turbo is going to spin the air anyways, first of all. Next, circulating the air going into the intake manifold seems rather pointless because (as WVO said) it will then be distributed to however many cylinders there are. Unless your brother has a custom intake manifold I'm afraid hes wasted his money.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

He has also placed an obstruction in the intake. Can't help.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags

BINGO !!

X2

X3, if you count what Shelby said in post 23.

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1980 300D - Veggie Burner !

My best fuel economy occurs at 75-80mph. I am convinced the 55mph propaganda was originated by the oil industry.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

You better not sell that car. Your experience runs counter to just about everyone else's.

I'm not calling BS, but it is strange.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags

I never thought it was unusual -- until now.

At 65-70 mph (on the Wash. DC beltway) I get 100-105 miles from full tank to the 3/4 full mark.

At 75-80 mph (on I-95) I get 120-125 miles from full tank to the 3/4 full mark. This one I know as fact because my sister lives exactly 126 miles from me and I can drive door-to-door from VA to DE on 1/4 tank. (I have made this trip dozens of times with the same results.)

Both examples include time on local roads between highways.

I conjecture that at higher speeds more oxygen is being rammed into the intake and the car adjusts to leaner running.

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2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

The only reliable way to compute mileage is from full tank to full tank and average over several tanks. Using the gas gauge invites error.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags

I do, and the patterns are always the same -- F to 3/4, 3/4 to 1/2, and 1/2 to 1/4 show the same mileage, with a significant drop-off from 1/4 to E. (I rarely run it below 1/4.)

Obviously, the gauge is not calibrated to measure fuel capacity evenly. When I top off from 3/4 to full, or from 1/2 to 3/4, 4 gallons does it each time. But only about 3 gal is needed to go from near E to 1/4 )or slightly above).

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2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

The only way I do it is to fill it up, drive it till it is say at 1/4 tank, fill up at the same pump so it shuts off at about the same time and see how much fuel goes in. The gauge is not calibrated to measure anything beyond a SWAG.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

Actually it BEGS for error.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Clearly gauges are not accurate but gas pump receipts pretty reliable, and if I buy 4 gals and travel a specific distance, I measure my results by that. Even so, something is still wrong since there is no way I could be getting 30mpg.

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2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black