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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 June 4th, 2013, 22:20   #1
NachtRitter
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Default Any East Coast folks know what this is? (Re-bodied rear engined TDI)

Spotted and photographed by a user over at ecomodder.com; see thread at http://ecomodder.com/forum/showthread.php/what-spotted-rear-engine-tdi-custom-aero-body-26074.html.



A rear shot reveals a TDI badge and a New York license plate (see the Ecomodder thread; since the number is still visible, I didn't want to post it here). Might get better than 40mpg?
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Old June 4th, 2013, 22:24   #2
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It has a sooty bumper.
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Old June 4th, 2013, 23:28   #3
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From "pulse & glide" probably...
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Old June 5th, 2013, 01:12   #4
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Or from bad aerodynamics at the back, it doesn't look right.
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Old June 5th, 2013, 01:33   #5
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Also cool was the post below that. A corvette with a diesel v8 getting 40mpg. It would be really awkward pulling up next to it and hearing a diesel instead of the normal sound you'd expect.
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Old June 5th, 2013, 09:58   #6
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Quote:
Originally Posted by MikeMars View Post
Or from bad aerodynamics at the back, it doesn't look right.
Ya, the slope is pretty steep from rear tire to tail lights... much steeper than the ideal 10 - 12%, I think...
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Old June 5th, 2013, 15:50   #7
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Pretty cool looking, whether or not it's perfectly aero-engineered. I'd be interested in more details.
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Old June 6th, 2013, 05:59   #8
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I was under the impression that a rear slope of around 7-10 degrees was optimal. Granted, that could be done without too much work, most likely...

Would be interesting to see if the owner is on the club and could share details. Based on the soot, I'm guessing 1Z/AHU or ALH.
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Old June 6th, 2013, 10:33   #9
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I think someone needs to track this guy down and figure out what's up! Calling all New Yorkers!
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Old June 6th, 2013, 13:15   #10
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Quote:
Originally Posted by bhtooefr View Post
I was under the impression that a rear slope of around 7-10 degrees was optimal. Granted, that could be done without too much work, most likely...
Yep, I was off... For the rear slope up from the under-body, a much shallower slope would be better... more like around 3 ...


From Kohri I., Numata N., Effects of rear end configuration of vehicles on aerodynamic drag, JSAE Review, December 1985.
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Old June 7th, 2013, 05:01   #11
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Oh, I was off, too.

Interesting how things change as the body shape changes. It also illustrates quite nicely why a sedan will get better mileage than a hatch (at least a Golf) or wagon (well, at least half of the problem).
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Old June 7th, 2013, 11:03   #12
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Quote:
Originally Posted by NachtRitter View Post
Might get better than 40mpg?
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Old June 7th, 2013, 12:56   #13
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... tongue in cheekiness ...
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Old June 27th, 2013, 19:39   #14
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Some sort of 74 mpg car that was designed and fabricated in 1987......
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Old June 28th, 2013, 04:29   #15
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That is quite a nice build, 87homebuilttdi! Do you have any more details about the build itself? Finally discovered your pics in the gallery
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