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Old 02-04-2013, 09:53 PM   #2 (permalink)
UltArc
Hydrogen > EV
 
Join Date: Apr 2012
Location: NW Ohio, United States
Posts: 2,025

Silver Flea - '05 Honda Insight
90 day: 58.96 mpg (US)
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Quote:
Originally Posted by Regenerit View Post
Hello Everyone, I purchased by 2011 Genesis Coupe 2.0T (2 Liter inline 4 cylinder turbocharged engine with 5 speed close ratio automatic transmission) this past December 2012. I've been running itnow for the last month and a half in somewhat chilly 25-45deg F weather in Chicago and have been getting 21-22mpg per tank on average with combined city/hwy driving. The EPA combined is 23 mpg; 20city, 30hwy. I'm essentially hitting the EPA numbers if you take out cold starts that net 4-8mpg for the first couple of minutes.

With my build, I am going to be aiming for engine efficiency and lighter parts, specifically a custom ECU tune on a dyno, a carbon fiber hood and trunk, lightweight wheels, and a lighter battery.

I wont be adding a boattail, making higher gearing, covering up the exterior of the car to lower its Cd, or any modification that will easily make it obvious the car has been modified with often rather ugly (if I may so so) aerodynamic mods.Nor will I be ripping out any of the interior, removing any seats, or even removing my spare wheel and Jack.

I may put on a lighter street legal more open single exhaust with a muffler(the vehicle is dual exhaust stock), upgrade to lighter pulleys, and more as it comes about.

At this time, with the the mods I will be doing, I will be looking at about $3210 altogether and may be able to recoup some of that money by selling the stock parts.

Weight savings for all of the mods together will be about 95lbs (43.1kg).

I will be purchasing a carbon fiber hood and trunk from Carbon Creations, both OEM style. The hood will not have any holes for breathing in it.
stock hood weight: 38lbs (17.2kg)
Carbon fiber hood weight: ~13.3lbs (6kg)
weight savings: ~24.7lbs (11.2kg). Cost: ~$700

stock trunk weight: 18lbs (8.2kg)
Carbon fiber trunk weight: ~6.5lbs (3kg)
weight savings: ~11.5lbs (5.2kg). Cost: ~$600

For wheels, I will be getting 18" Enkei RPF1's 18x8
Stock front wheel weight: 26lbs(11.8kg) x 2wheels= 52lbs (23.6kg)
stock rear wheel weight: 27.5lbs (12.5kg) x 2 wheels = 55lbs (25kg)
Enkei RPF1 wheel weight: 17.8lbs (8.07kg) x 4 wheels = 71.2lbs (32.3kg)
total weight all stock wheels: 107lbs (48.5kg)
weight savings: ~35.8lbs (16.2kg). Cost: ~$1200

Stock battery weight: 38lbs (17.2kg)
Braille AGM B2015 battery weight: 15lbs (6.8kg)
weight savings: 23lbs (10.4kg). Cost: ~$160

TOTAL WEIGHT savings: 95lbs (43.1kg)

Total cost of mods: ~$2660. + $550 ECU tune: ~$3210.

Expected summer fuel economy with all mods and ECU tune and typical hypermiling driving without engine off coasting or driving in neutral: 30mpg city, 40mpg highway.
EPA estimates: 20 city, 30highway. That is a 33% improvement.
You are welcome to do whatever you want, and I look forward to seeing results, but 3210 dollars for 95 lbs of saving does not seem very efficient. Especially if you are not going to increase your gearing.

And with just those mods, I do not know how feasible your goals are. I think in a standard, any vehicle should be able to get highway mpg in the city. I see 32 mpg in the city depending on distance, but 6 speed standard. Maybe the tuning will help, but it does seem a bit unlikely :/
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