All Things Mk5 > Performance Modifications
improving aerodynamics with OEM parts
Richn83:
The rear parts especially the audi parts on the control arms are aerodynamically shaped and i don't think audi and vw strap bits of plastic to the bottom of the car for no reason :laugh:
the bruce:
--- Quote from: fuscobal on January 05, 2012, 10:54:39 pm ---I've ordered the front large undertray but cannot find a real aerodynamic purpose on the little bits from the rear. I'd better look into making an entire piece just like in front instead of all those small pieces !
--- End quote ---
Great idea. I thought about that many times.
The problem is the heat caused by the exhaust, so that heat resistant material has to be used.
Richn83:
The other problem with a single rear cover is the amount of consistent space you have to run a flat area of plastic at the same level or higher than the front end.
In front of the rear axle the fuel tank drops down below the line of the rest of the body on one side and the other you have the first silence.
Then you have the rear axle which gives you clear space and mounting points yet the exhaust comes through that area directly in the middle between the control arms if you look at the larger pass at part in my earlier photos the exhaust interferes with this.
Then between the control arms you have a gap of maybe 30 cm in the middle where you don't need clearance for the suspension to be able to fully travel.
Straight behind that you have an exhaust taking up the entire rear area before the number, the standard one if you could get a material that is temperature resistant could be boxed in and the cover made to bolt on to holes that are already in the rear bumper, but this could cause heat issues into the cabin. So you would want a rear vent or something to draw air over the rear silence, and the larger miltek or after market exhausts all hang down lower so would be even worse.
I had a look into potential materials as well and stuff that's easy to work with like abs plastic generally has low melting points which leaves you with rigid materials like aluminium or harder plastics, or you could do a wet lay up in kevlar or heat resistant carbon fiber?
My thought on the best option would be a panel that comes from the rear of the fuel tank through the middle of the rear axle uptto the exhaust and then attach slightly curved upward material to the control arms to flow air up behind the car to reduce rear drag at higher speeds
the bruce:
This one has a real working duffuser:
The professional built racing Mk.Vs have no rear muffler and different lower arms not to disturb air flow.
Duke:
Quite interested in this, especially as I take mine on track.
How hard are the parts to fit generally? Can I do itself by jacking the car up or does it need to be done on proper ramps (i.e get garage to do it)?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version