Rolled fender aero?
 

So I have found myself in need of at least one fender for my car, and I’ve been inspired by the work of OG VX, with his trailing edge rolled in for smoother air evacuation from the wheel wells... I however can’t find any info on this mod... I’m sure it’s buried in his build thread but I hadn’t found it yet... how much was gained by having the fender vented in such a manner?

I think you would be hard pressed to quantify a value of reduced fuel consumption. These types of mods are adders that may not do much individually, but when combined with other subtle mods can start to add up.

I haven't seen this example but it is done routinely in racing and on very high efficiency cars.

I remember a more subtle version done on the G1 Insight, but I had no idea if it helped much at all

Curious too to know if and what might be measurable.

Needs pix.

I know you can roll the lip out, just [repeatedly] feed an aluminum baseball bat through as the car rolls forward and back.

My current scheme is to use a pool noodle cut in half lengthwise and fastened justvat the edge of the wheel well. It's far down on the list though.

rolled
 

It dates at least to the Scaglietti-designed Ferrari's of the 1960s.A number of makers have used a version of it ever since.I don't know that it's ever been tested and quantified as a specific feature.:(

A tight tire to wheelwell fit may just have the same impact.

I just didn’t know if he posted any info regarding his fender mod...
Agreed, but my car needs dropped lol... I’m running about as large a tire as I feel good about running due to strut clearance...

https://duckduckgo.com/?q=stance+nation

It was reduced to a styling cue on the 1956 Corvette.
http://3.bp.blogspot.com/-pnRAu9zz6T...at+Waldorf.jpg
http://lost-show-cars.blogspot.com/2011/12/lost-show-concept-cars-1955.html

Corvette
 

It would have been good if they had radius'd the trailing edge of the wheel opening to help bring the flow parallel to the outer flow,rather than collide with it.:(

Something like that would be great if I had a longer fender to roll in, but I’ve only got about 6” of fender...

Seems like a lot of work for a questionable result. But I can imagine that any rounding of that edge will help reduce wake.

If you do it, please do at least an A-B test. Probably no going back to A on this one.

BMW saw enough benefit from relieving wheel well pressure to implement a vent (same function as the rolled fender, evacuation of higher-pressure air) on the X5.

http://cdn.bmwblog.com/wp-content/up...20-750x272.jpg

Agreed that the front tire to door hinge line is critical.

http://ecomodder.com/forum/member-fr...3-8752da9b.jpg

I think this is a fiberglass Hebmuller, but you can get the same effect by grafting a Superbeetle nose onto the back. Gary Emory did it in the 90s. That would be a good picture to dig up. He did it to a 1952 with an MG-TD windshield!

It’ll be very difficult to get anything resembling a valid A-B test of the fender mod... I figure that if I mod the trailing edge, I’ll do a pair of fenders and swap them on... problem is, it takes about 90 min a side due to the other stuff that needs removed... weather would change a lot in half a day...