EcoModder Forum weight VS. wind

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 06-28-2008, 03:50 AM #1 (permalink) EcoModding Lurker     Join Date: Jun 2008 Location: phoenix az Posts: 34 the Streetwalker(stolen 2-22-2010) and found May 2 - '93 ford Escort 90 day: 26.91 mpg (US) ol' blue - '94 Harley davidson Blue NEW E BIKE! - '99 Chrysler Ebike 24 volt Mom's Jeep - '88 jeep cheroke laredo 90 day: 19.28 mpg (US) Thanks: 5 Thanked 1 Time in 1 Post weight VS. wind Okay, here goes, first real thread and question. I've been thinking of a few mods with my EXTREMELY limited mechanical ability. My first thought is to change my fancy ford escort wheel for the stock steel clunker with moon caps. I was wondering if ... 1. there is a big boost from this. 2. if this aero mod will be offset with the increased weight of the steel wheels. There will probably be a 25 percent increase in weight.... will I save fuel?? I looked at mods like basjoos?(sp) and wonder if that stuff he surrounded his car with weighs so much that he had no net benefit's. What I need to find out really is.... will added weight offset an aero mod. and how do you calculate such a thing. sorry for the amateurish question, but I am new. __________________
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 06-28-2008, 05:08 AM #2 (permalink) EcoModding Lurker   Join Date: Mar 2008 Location: KY Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts weight vs. wind http://ecomodder.com/forum/showthrea...nnel-1924.html is an excellent thread on this. Bearleener found a handy rule where reducing your coefficient of drag by .01 is equivalent to shedding 220 pounds. However, I believe that figure is only accurate at a constant 60 mph. Since weight has a greater relative impact at lower speeds, and especially under acceleration, the practical equivalent should be considerably less than 220 pounds. Here Measure the drag coefficient of your car - Instructables - DIY, How To, ride is an excellent instructable that should be able to tell you how much of an improvement those wheels make. Of course, the simplest solution is always to hook up the ol' scangauge or neighborhood friendly gas station and take em out for some test runs... __________________ 1987 Chevy G20 high-top van - 305, TBI, 11MPG on its only trip Last edited by Vanner; 06-28-2008 at 05:13 AM..
 06-28-2008, 09:03 AM #3 (permalink) Recycling Nazi     Join Date: May 2008 Location: People's Republic of Albany Posts: 234 Blue Bullet - '06 Honda Civic Sedan LX 90 day: 35.68 mpg (US) Thanks: 2 Thanked 7 Times in 7 Posts wanna bECO, wanna post a (modest) picture of your rims? Might help if someone wants to comment on your particular set-up. Vanner is right. At a steady speed, momentum (weight) works for you almost as much as the higher rolling resistance works against you. My goal is to find very smooth wheel covers for my two front wheels and rear wheel well skirts to cover the back. __________________ --- Bror Jace
 06-29-2008, 08:27 PM #4 (permalink) EcoModding Lurker     Join Date: Jun 2008 Location: phoenix az Posts: 34 the Streetwalker(stolen 2-22-2010) and found May 2 - '93 ford Escort 90 day: 26.91 mpg (US) ol' blue - '94 Harley davidson Blue NEW E BIKE! - '99 Chrysler Ebike 24 volt Mom's Jeep - '88 jeep cheroke laredo 90 day: 19.28 mpg (US) Thanks: 5 Thanked 1 Time in 1 Post okay, here is a pic of the Rims.... I know, I know... they're pretty dope ... but then again, so is the whole ride. So, will i gain any mileage changing to steel rims with moon caps, I don't really care about how she looks.... she is just transpo after all. Attached Thumbnails   __________________
 06-29-2008, 08:35 PM #5 (permalink) Dartmouth 2010     Join Date: Nov 2007 Location: Hanover, NH Posts: 6,447 Vegan Powa! - '91 Honda CRX DX Team Honda 90 day: 66.52 mpg (US) Thanks: 92 Thanked 122 Times in 90 Posts I find that those new to FE tend to give mass much more weight in their modding pursuits than it deserves. TEHEHE Anyway, I would focus on aero and say screw it to weight (at least as far as the weight of aero mods are concerned). It's not a 1/4 mile strip so it's not as important as it is to all the tuners. __________________ EcoModder's best: Donate to EM | Window clings | EM Shirts | Better Gas Mileage | MPG Tracking More fun sites: Green Home Improvement | crxMPG | Benjamin FT Jones | Vegan Recipes | Car-free Living
 06-29-2008, 08:56 PM #6 (permalink) Master EcoModder     Join Date: May 2008 Location: boston ma Posts: 381 Thanks: 0 Thanked 5 Times in 5 Posts If you want to just try before you buy, Cover the outside of the wheel with cardboard and duct tape. If you are able to take the wheel off, you could cover up the inside parts of the spokes as well. Make sure you do not get any cardboard/tape pinched between the wheel and the hub when you put the wheel back on. Last edited by ttoyoda; 06-29-2008 at 08:57 PM.. Reason: a real strange bug in the forum
 06-29-2008, 11:11 PM #7 (permalink) EcoModding Lurker     Join Date: May 2008 Location: DC Metro Posts: 48 Ranger - '08 Ford Ranger XL 90 day: 20.73 mpg (US) Thanks: 0 Thanked 0 Times in 0 Posts I would say the answer depends on what type of driving you do. If everything you do is city, then I would dump as much weight as you can. If everything is highway the aerodynamics are more important. For a compromise, why not just get some old election signs and zip-tie them to your bling escort rims. You get better aero, the reduced weight, and you don't need to buy new wheels. In the event you need to take the wheel off, just cut the zip tie. __________________ Ohio State Baja SAE
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Quote:
 Originally Posted by adrive7 For a compromise, why not just get some old election signs and zip-tie them to your bling escort rims. You get better aero, the reduced weight, and you don't need to buy new wheels.
To say nothing of the extra style points, and the chance to end up on someone's ricer site.
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1987 Chevy G20 high-top van - 305, TBI, 11MPG on its only trip

 06-30-2008, 10:46 AM #9 (permalink) Veggiedynamics   Join Date: May 2008 Location: Alexandria, MN Posts: 684 Volt12 - '12 Chevy Volt base Thanks: 0 Thanked 12 Times in 10 Posts i know my areo mods on my CRX have added a few hundread pounds.. just by know what materials when into them , but my MPG has gone up. so I have decreased my drag more that the weight that was added added.. Doubt I'll end up on a ricer site: __________________
 06-30-2008, 12:23 PM #10 (permalink) EcoModding Lurker     Join Date: Jun 2008 Location: phoenix az Posts: 34 the Streetwalker(stolen 2-22-2010) and found May 2 - '93 ford Escort 90 day: 26.91 mpg (US) ol' blue - '94 Harley davidson Blue NEW E BIKE! - '99 Chrysler Ebike 24 volt Mom's Jeep - '88 jeep cheroke laredo 90 day: 19.28 mpg (US) Thanks: 5 Thanked 1 Time in 1 Post WOW! that is one sweet ride... I guess election signs will disappear in my hood this year! __________________