2003 TDI Beetle TDI FE mods - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 02-17-2007, 05:36 AM   #1
Registered Member
 
Join Date: Feb 2007
Posts: 244
Country: United States
2003 TDI Beetle TDI FE mods

In my travels this morning, I came across this retired engineer who increased FE in his 2003 VW Beetle TDI from the EPA highway 49 MPG to 65 MPG (including a record 78 mpg tankful) w/ slightly larger diameter and LRR tires plus a wing on the rear hatch. Is this guy a gassavers.org member?nnThere are comments further down the page from someone who claims acetone added to gas improved FE in his '93 Civic by 9%.

http://www.greencarcongress.com/2004..._wings_of.html

Here's the link to the Beetle owner's website:

http://www.max-mpg.com/
__________________

__________________
cems70 is offline   Reply With Quote
Old 02-17-2007, 08:23 AM   #2
Registered Member
 
Join Date: Oct 2006
Posts: 245
Country: United States
not bad. thats about 50-60% over epa ratings.

(edit) epa combined is 45 so he's in mid 40's % wise, still a nice gain.


the 78 mpg tank was done driving at 55 mph.
__________________

__________________
"Sylvie" 2000 Honda Insight 5 Speed


LxMike is offline   Reply With Quote
Old 02-17-2007, 09:46 AM   #3
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
His FE isn't that high, could prolly be done by driving technique alone, especially with that diesel, but I'm sure the wing would help with the crappy aero on that beetle.

In any case, I think he's registered here, but doesn't post.
SVOboy is offline   Reply With Quote
Old 02-17-2007, 10:27 AM   #4
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Yup yup. When he did go 55mph for prolonged periods, he supposedly pulled near 80mpg. Slowing down is always good for mileage, especially on cars that have such crappy aero.

Quote:
Originally Posted by Ernie
THIS IS AN UPDATE ON THE BEETLE'S SUMMER MILEAGE

As expected, mileage during this last summer (2005) averaged about 65 miles per gallon, when traveling at a normal highway speed of 65 miles per hour. There is a rule of thumb that a car will get 10% better mileage by slowing down 5 mph on the highway. Or, if you slow down 10 miles per hour, your mileage should improve by a whopping 20%. So, you can calculate how well the car would do at a different driving speed. Remember, when figuring speed, you should include any headwind.

In early September, I traveled from Utah to Wisconsin to attend the annual meeting of the TDI Club, an on-line group of VW diesel car owners. I wanted to see just how good my mileage could be-- I drove all the way to the meeting at 55 miles per hour. Early on Wednesday morning, I topped off my tank (filled with 5% biodiesel blend) at Park City, Utah, waved goodby to the attendants, and headed out determined to see just how far I could get. I was blessed by perfect weather, almost no wind, all the way.

I finally stopped for fuel about noon the next day at Davenport, Iowa, a one-tank trip of 1,209 miles. (All at 55 mph, remember. I was honked at four times.) I filled the tank, taking 15.5 gallons. I had obtained a record --for me-- 78 miles per gallon.

Ernie Rogers
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 02-17-2007, 11:23 AM   #5
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
Quote:
Originally Posted by omgwtfbyobbq View Post
Yup yup. When he did go 55mph for prolonged periods, he supposedly pulled near 80mpg. Slowing down is always good for mileage, especially on cars that have such crappy aero.
how is a coefficient of .37 possible on a car with such curves?!? Is the 30 degree angle of death rear hatch? The wheel flares? What is the deal?
__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 02-17-2007, 11:44 AM   #6
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
It's not about smoothness so much as angles, anything greater than 10-15 degrees is bad. The round back end looks to be near a 40 degree, if you cut straight from the roof line to the bumper, so I'd guess it's worse than the angle of death rear hatch. The wheel flares that stick out from the body are also pretty bad imo because they have that same steep angle that will result in a big pressure drop behind them, and lots of drag. Not to mention it has more reference area than more aerodynamic autos like Honda's passenger cars. Even the Corolla is way better, and if you look at it, from the roof to the top of the trunk is not very severe, while the trunk down is a big drop off... So the area of the angle of death has the most impact on aero imo.
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 02-17-2007, 03:11 PM   #7
Registered Member
 
Mike T's Avatar
 
Join Date: Dec 2006
Posts: 321
Country: United States
My smart car has a Cd of 0.38, which is pretty bad, and the surface area is high too. Nonetheless, 100+ US MPG is possible at 50 MPH. Imagine what it'd be with a slippery low-profile body.
__________________
2008 Mercedes-Benz B 200
2006 smart fortwo BRABUS Canada 1 cdi cabriolet
2005 smart fortwo cdi pulse cabriolet
1966 Peugeot 404 Coupe Injection
Mike T is offline   Reply With Quote
Old 02-18-2007, 02:47 PM   #8
Registered Member
 
Join Date: Oct 2006
Posts: 557
Country: United States
I've known Ernie about three years now. He's a former aeronautical engineer and doesn't jump into these things arbitrarily. He has repeatedly tested single variable changes (including many different angles of attack) as the present design has developed. The only issue with his on the road testing methods may be that they are obviously not "double blind". His goal is to reduce the Cd of the N-B as far as is possible without going outside the projected area. He knows he'll never get the Beetle's Cd as low as a CRX or other, but he's made big advances so far.
Lug_Nut is offline   Reply With Quote
Old 02-19-2007, 12:23 PM   #9
Registered Member
 
Join Date: Feb 2007
Posts: 101
Country: United States
That wing looks rediculos but it's very functional. Congrants to him on what he accomplished.
__________________

__________________



korax123 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Add vehicle transmission types Timberline Fuelly Web Support and Community News 4 03-27-2012 10:50 PM
Adding Vehicle. CrimsinRain Fuelly Web Support and Community News 2 01-20-2012 07:29 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 11:51 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.