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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old July 31st, 2001, 09:07   #16
Driv'n EZ
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Join Date: Aug 2000
Location: Soot Belchin, USA
Default Re: Will mud flaps adversely affect mpg?

I tend to agree with Mickey and somewhat with Ric on this one. The paint that I protect with my four mudflaps is much more valuable to me than the extra spoonful of fuel per tank I MAY consume. Of course, I'm the guy who has no problem towing a 5x8 enclosed trailer with my Jetta TDI and am satisfied with 23 mpg at 72 mph.

As far as increased drag or turbulence, I'm sure there will be SOME increase, but not significant enough for me to detect a difference in my actual MPG figures. After all, the wind is already broken by the wheel. It's not like they are sticking out with no other front wind break.

Without the trailer and with mudflaps, I still achieved over 50 on my trip to Chicago this summer. So, in reality, I would say, "No" They do not affect fuel economy.

[ July 31, 2001: Message edited by: Driv'n EZ ]
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Old August 1st, 2001, 10:16   #17
GGFIII
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Default Re: Will mud flaps adversely affect mpg?

Maybe the next "war" will be about what brand of car wax provides the lowest drag, and allows that extra 1/10 of a mpg.

I guess I will have to ignore my family and job, so I can get really involved in these important issues.
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Old August 1st, 2001, 16:38   #18
godlike242
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Default Re: Will mud flaps adversely affect mpg?

well,

i have had mudflaps on for a while now, and the only change is that i have to wash the sides of the car less often than before.

the drag coeffient of a jetta is... .30, a golf is .31 and a bug is... .34 if i remember correctly.. they are all pretty decent i guess for their size and shape.

i suspect at anything less than triple digit speeds, the difference a mudflap makes is negligible. it is really not worth worrying about as quality resprays on cars will pay for a good year or two of fuel for TDI's.

The only problem i see with them is the asthetics.. if you have a light colored car, get 'em sprayed to match or they look really lame.
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Old August 2nd, 2001, 10:14   #19
jorpet
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Fuel Economy: 48 Lifetime
Default Re: Will mud flaps adversely affect mpg?

This reminds me of the old question (in the early '70's) on where to mount a water bottle on a bicycle. It was determined that mounting it on the seat tube increased the drag of the bike by 10% [img]images/icons/shocked.gif[/img] and on the down tube by less than 1% (since it is in the turbulance of the front wheel).

Funny all bikes now mount them on the down tube...
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Old August 6th, 2001, 16:43   #20
fordfalcon
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Default Re: Will mud flaps adversely affect mpg?

Maybe you should consider cross drilling and slotting the mud flaps. Not only will that reduce the drag, but also cut down on mass. You must take into account the added weight.
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Old August 6th, 2001, 17:56   #21
tommy37
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Default Re: Will mud flaps adversely affect mpg?

Whatcha wanna do is, get a set of mudflap hinges. The VW part is made of genuine ABS plastic which won't crack unless something hits it. I forget the VW part number. The hinges allow the flaps to deflect upward out of the airflow as speed increases.

The EPA reported that these things have no effect. But it was a staionary test conducted in their own lab so it doesn't prove anything.
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Old August 6th, 2001, 18:56   #22
jetmann
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Default Re: Will mud flaps adversely affect mpg?

<BLOCKQUOTE><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><HR>Originally posted by tommy37:
Whatcha wanna do is, get a set of mudflap hinges. The VW part is made of genuine ABS plastic which won't crack unless something hits it. I forget the VW part number. The hinges allow the flaps to deflect upward out of the airflow as speed increases.

The EPA reported that these things have no effect. But it was a staionary test conducted in their own lab so it doesn't prove anything.
<HR></BLOCKQUOTE>ROFL!

Sign me up for four pairs! I'll put em on my bicycle and the wheelbarrow, too [img]images/icons/grin.gif[/img]

Seroiusly, there would, of course, be an increase in drag, and corresponding decrease in mileage at speed if the mudflaps were traditional in shape and mount (perhaps as much a CDx of .02 and mileage differential of .002! These are serious numbers, folks!)

If however, the flaps were radiused along their major axis, and mounted in such a manner that the deflection were out, away from the car, instead of down, there would be several huge benefits!<UL TYPE=SQUARE><LI>1. Air would be vented away from the car, at speed, allowing enterprising modders to create another exit point for foul or hot atmosphere<LI>2. Downforce would not be compromised by the airfoil effect of the mudflaps<LI>3. Straightline stabilization would increase, due to the tremendous amount of atmosphere being vented outward from the sides of the vehicle<LI>4. Instead of dousing old lady and little kid pedestrians within 20 feet of that puddle, this mod will extend your target range to 90+ feet<LI>5. Indeed, you really needn't wait for a rain, gravel and other roadside debris becomes usable as projectiles, year around[/list]
Along with all these benefits, CDx would be lowered and potential fuel mileage raised, because atmosphere blasting out from within the car would create a partial vacuum next to the skin of the car, the degree of which would increase with vehicle speed, and through which the vehicle would be moving. The net effect of this would be to lower the density of the air through which the vehicle was moving, forcing a net decrease in CD, and increase in MPG.

BTW, does anybody in this forum possess a BSometer? [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img]

[ August 06, 2001: Message edited by: jetmann ]
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Old August 9th, 2001, 19:41   #23
Old Navy
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Fuel Economy: 28 mpg on PU, 33 on Car
Default Re: Will mud flaps adversely affect mpg?

On my '00 NB the mud flaps are getting rather ragged from being draged over speed bumps and rain hup in my driveway at the street edge. I will have to go out tomottow morning and hit the bottom edges again to smooth them out. I'll bet in a years time I have scraped of at least a 1/2 inch of plastic.

bone stock white NB, running 42 PSI front & rear tires, and 8oz of Diesel Kleen with Amoco PowerBlend. Also have 15D throttle stompers for improved fuel consumption. [img]images/icons/wink.gif[/img] [img]images/icons/tongue.gif[/img] [img]images/icons/grin.gif[/img]
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