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Old 05-30-2011, 06:52 AM   #21 (permalink)
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highcountryexplorer - '86 Nissan 720 KC 4x4 ST with fiberglass cap
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Don't have the link...but there was a study done back when cars were square shaped showing an avg 1-2% mpg gain from air dams...which translates to 1/3 to 2/3s of 1 mpg for the Focus....hard to expect to verify?

I think I'm going to try and do something like what you have due the the scraping problem with my air dam. I might try using plywood well primed with polyu varnish.

While the air dam probably creates a partial vac under the front of the car...the gradual deflection of the air with the front pan makes more sense except for the lift it might cause?

I've been managing ~33 mpg with mixed driving last 2 tanks and could probably do 40 mpg on a level road...no wind...50 mph.

I'm now typically accelerating at around 32 TPS up to 40-45 mph due to the BSFC map...35-36 TPS would probably be about as efficient...except that more load on the ATX means some efficiency loss? Once the ATX goes into OD...I carefully drive for mpg....using the cruise as much as possible.

A few corners and/or stop signs drop the avg pretty quick. Also short trips from a cold start.

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Old 05-30-2011, 03:05 PM   #22 (permalink)
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Wagon - '06 Ford Focus zxw
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Congrats on your work.

I'll follow your thread if you're doing others aeromods as I would like to do some too on my 06 focus wagon.

I can't seems to get any better than 30mpg with mine in mixed driving...

Did 32mpg once all highway when I bought it.

Last edited by morphector; 05-31-2011 at 01:39 PM..
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Old 08-04-2012, 08:11 PM   #23 (permalink)
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Tire Dams

Someone suggested some tire dams. How much do these really help?

Also great job on the front belly pan. I really like it. I also have a focus and will be doing this in time. Let me know the gas mileage you really realize.
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Old 08-05-2012, 07:54 AM   #24 (permalink)
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highcountryexplorer - '86 Nissan 720 KC 4x4 ST with fiberglass cap
90 day: 21.78 mpg (US)

Elroy - '03 Ford Focus ZX3 w/Zetec DOHC engine
90 day: 32.89 mpg (US)
Thanks: 6
Thanked 78 Times in 65 Posts
Can't verify a gain from the front belly pan...but three things I'm pretty sure work...a cone filter with a 6-7% gain....a Scanguage or Ultragauge....you just need to monitor avg mpg...instant mpg...TPS (throttle position)....increased tire pressure....

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