Audi A2 3L aeromodded for max FE
 

Hi,

I have put some pictures of my customers Audi A2 3L model to my facebook pages. I have only given tips and inspiration and he has done the mods by himself. Execution quality is better than in my Lupo 2L project.

https://fbcdn-sphotos-h-a.akamaihd.n...26866434_n.jpg

https://fbcdn-sphotos-g-a.akamaihd.n...24821804_n.jpg

27 more pictures can be found https://www.facebook.com/media/set/?...3642791&type=3

At the moment car gets 2.5-2.6 l/100km @ 100 km/speed and tweaking will continue. Boattail is under though process and some parts for that have already been bought. Some racing will definetely happen between this Audi and my Lupo ;).

Very nice!

Can you explain the scoop on the aft edge of the hood/bonnet? Is that black area where the original vent/fresh air intake is?

https://fbcdn-sphotos-f-a.akamaihd.n...06706460_n.jpg

Yes I think original fresh air intake was there. At the moment it sucks the air from left hole in front bumber through that small hose. its not flowing enough and need improvements.

Wow, it looks really nice.

Those are excellent skills displayed on his Aero mods. Nearly everything looks oem.

Nice. Thanks for posting here. Some people who've been around computers for a long time won't touch FaceSpook for any reason. You may have noticed the way encrypted email is being monkey-wrenched? That's to drive *more* people toward social media.

Rant off. I really like the continuity of the black stripe around the bottom.

What can you say about the fender skirts? I take it that they are flat and all the bubble is in the fender itself. Are they aftermarket or home-brewed?

I have sheet ABS to make a set, and I've seen some discussion of clamping arrangements, but I'm curious about the edge's contact with the fender. Is there a seal strip of any kind? Is it just a plain edge or is it flanged for more contact area?

TIA [meant as Thanks In Advance]

Before he goes all out on a full boat-tail, you might point him to that box cavity study we have linked to somewhere around here on E.M. ( which actually uses an Audi A2 as the test vehicle )

( I can't remember the title of the thread. Anyone else remember ?
)
It would be an easy mod to do when compared to a full boat-tail.

Also, I agree about the fit and finish looking OEM.

The box cavity had very minimal results. If I recall correctly, 2% or less.

What did he use for the wheelcovers?

For the benefit of our American readers, I have done some calculations. 2.5 liters is equivalent to .66 gallons. 100km is equivalent to 62.5 miles. When you divide 62.5 by .66 the result is 94.7 miles per gallon. This is quite impressive. Nice job Vekke!

Wheelcovers are abs plastic and he got those from me. So those were Tunecovers without any holes. He then drilled that center hole himself.

All mods are homemade. I think rear fender skirts are 1-2mm aluminium sheet. Attached with angle irons like in my Lupo first to the body and then to that sheet. I think you can see same method in right front tire splatter which was made from clear PC.

https://fbcdn-sphotos-h-a.akamaihd.n...68885458_n.jpg

It's refered to early in Vekke's Lupo 2L thread:
http://ecomodder.com/forum/showthrea...tml#post253945
http://ecomodder.com/forum/showthrea...-3l-18044.html

Congrats to both Vekke and the owner. Very slick looking!

How I miss my A2 3L ...

Even if it's only 2 % , it's 2% better ;)

It'll be far easier to get away with an unobtrusive box cavity here in Europe than with a fullblown boattail :(

Those Vikings way up in the Nordic woods can get away with a bit more than the rest of us on the old continent. :D

Or just put "2.5l/100km to mpg" in Google.

Nice details such as the Audi center cap on the wheel covers, the row of lights in the front end,and those mini mirrors too !

BTW, Why does it appear as if he left his mud flaps on behind his front wheels ? Surely this is something else.

Those are custom mud flaps. They will evolve to mudflap boattails when they are ready. like I wrote this car is driven on gravel roads and this Audi has quite nice paint at the moment and it is ruined quite fast without mudflaps. I had similar boattails in my Seat and similar will come to my lupo also.

Perhaps you would have an opinion on this:
http://ecomodder.com/forum/member-fr...42-mudflap.jpg
Scaled down of course, I did this for a guy with a truck. The belt material would only be fastened along two edges, to allow it to flex.

Did I mention my two sheets of 24"x48" ABS plastic? It is stiff enough on its own? I kind of thought there was trim going around it, but that must be the actual rim. My rims have centercaps. I just do not have any idea how I could attach ABS discs or the aluminum ones that I found at a restaurant supply store.

I honestly do not know what my previous plan was, fiberglassing my own hubcaps... Hmmm...

That is 3mm thick ABS is stiff enough.

Freebeard design work before the tires perfectly.

I have plans to make it also closed from back side so it works also after tire. Try to get it from one piece sheet. First the shape is modeled is 3D and after that printed to paper and cut to shape and glued/vulcanised together. Finally attached to car frame like freebeards model

A few ecomodders have those on their vehicles.
Works even better if you make one on both ends of the wheel - and connect them with a plate on the inside to shield the tyre from the air.

Remember that the airflow on the underside of the car is not aligned with the car.
The air wants to get out between the front and rear wheels, so you get almost diagonal flow in front of the rear wheels.
It'd help to align the rear wheel spats with that flow, rather than make them parallel to the car body - it's likely also part of the reason why a narrower rear track is an advantage.

I made a clear front grill block on the Q45 and glued the grill logo onto it...same as he did. I kinda like the dark tinted Plexiglas he used.

Dark tinted plexi: that's actually an OEM/factory grille block specific to this 3L model, if I'm not mistaken, not DIY.

Yes that tinted grill is from factory.

very nice!!!!!

euromodder -- Front? It went thataway <==> :)

Yes, of course. The drawing was made for a guy with a pickup truck and I didn't want to overload him. Both sides, entry and departure angles per Thee Template.

I was mainly concerned about the construction from two U-shapes, with the belting unconstrained at it's upper end center.

What I learned last weekend is that the outer half of the spat may be redundant. The rule at Bonneville is [apparently] fences need to be longitudinal to the direction of travel. None the less, I saw examples that hug the tire on the inside and angle across the width of the tread. Like so...
http://ecomodder.com/forum/member-fr...bonnevette.jpg

Wow, wish that Audi A2 made to the USA market... we're stuck w/ just the Prius & Insight ;)

Very nice indeed. A2 is a great choice for ecomodding. I never really understood why people start modding cars which have the aerodynamics of a brick.

Some progress on the audi a2 as well.
https://scontent-arn2-1.xx.fbcdn.net...10101299_o.jpg
https://scontent-arn2-1.xx.fbcdn.net...df&oe=563012B2
Note the rear diffuser and new front wheel skirts and aero mudflaps.

All pictures and more details can be seen here:
https://www.facebook.com/media/set/?...e=3&uploaded=2

That looks fantastic!

Are the aluminium rear hubs of other function than lightening of rotating mass? Do they also narrow the rear track width to improve aerodynamics?

http://ecomodder.com/forum/attachmen...1&d=1435651760

I made a mock-up rear skirt for my A2 and seems like my rear wheels are wider from the body than this silver one.

Hub are lighter and have less rolling resistance so they are only oil lubricates no grease in those ;).

I am not 100% sure but this ones rear axle might be from Lupo 3L to save weigth and get narrow track. Or the change is in the custom hubs.

Saw some new pics on the gallery: https://www.facebook.com/media/set/?...3642791&type=3

https://scontent-ams3-1.xx.fbcdn.net...ed&oe=5651AF39

https://scontent-ams3-1.xx.fbcdn.net...36&oe=567F2CB2

Very interesting.