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Old 05-01-2011, 10:41 AM   #21 (permalink)
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Quote:
Originally Posted by redpoint5 View Post
Nice work! Looks like a politicians race car now underneath. My question is, how much of a difference did it make? Could a mod like this cut down on road noise too?
It is not scientific since I can't really do back to back testing of the belly pan. But there is a trip I regularly take where my previous best mpg was about 55 with careful driving and I got into the low 60s after the belly pan, on the Scanguage. I didn't really notice any difference in noise though.

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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 05-01-2011, 04:34 PM   #22 (permalink)
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It'd be great if you have a template/trace out of your undertray :-)
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Old 05-18-2011, 04:04 PM   #23 (permalink)
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Where you get your plastic plugs? Those things are expensive in the auto stores
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Old 05-18-2011, 04:06 PM   #24 (permalink)
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Also, be careful about how you fasten your copper tubes. Galvanic corrosion will rust your car.
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Old 05-18-2011, 04:28 PM   #25 (permalink)
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Where you get your plastic plugs? Those things are expensive in the auto stores
If that question is directed to me, I just drove the roofing screws into existing plugs in the VW underbody, didn't even pre-drill. Make sure the leading edge is fastened securely and no problems with the rest.
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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 05-18-2011, 04:29 PM   #26 (permalink)
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how you mount these panels? did you have to drill holes in the body?
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Old 05-18-2011, 06:49 PM   #27 (permalink)
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Quote:
Originally Posted by minAirForce View Post
how you mount these panels? did you have to drill holes in the body?
http://ecomodder.com/forum/member-co...mg-0134sm.html

If you look carefully at this "before" photo you can see a round plastic plug just to the left of the catalytic converter and a couple more on the frame type reinforcements (look where the fuel line snakes around).

This photo shows what I used to attach it. NO new holes were drilled into the sheetmetal.http://ecomodder.com/forum/member-co...-img-0142.html
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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.

Last edited by COcyclist; 05-18-2011 at 10:07 PM..
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Old 05-21-2011, 02:13 PM   #28 (permalink)
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Undertray Results

Hi guys,

Have finally made my way through 87.5 litres of various flavours of diesel (83% Bio 17% Dino) with my undertray on, and I'm showing a 4mpg (uk) increase from 58 to 62mpg. That brings me into the 50's in US mpg.

Initial observations:
  • Noise levels seem higher (tho this could be my hard tyres);
  • I can hear more 'wind noise' around the A pillars (perhaps the road noise has dropped so I can now hear this);
  • This is only the first full tank with the tray on, and it is pretty roughly built;
  • I have been driving VERY VERY slowly tho I was doing that last tank too;
  • Due to the price of fuel in the UK (about $2.28 per litre), the motorway network has slowed down, with many lorries now limited to 50 by their owners; and
  • I need to tune the exit angle, it is way too steep as it is.

I have also just scored a scrap garage door, so will remake my undertray from Sheet Metal to make it smoother.

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