All Things Mk5 > Performance Modifications
Improving aerodynamics with aftermarket parts
the bruce:
Thank you Ken, have your pics on the other forum.
Did you have a view at the underbottom?
mkviken:
no i didn't sorry. it was flat though but no large rear diffuser
fuscobal:
I will probably go with a Reverie wing but have 4 options at this point :
Chord > 150 ; Span > 1250 ; Downforce @ 160kmh and AOA of 10deg > 380N ; BHP absorbed > 2.9
Chord > 150 ; Span > 1400 ; Downforce @ 160kmh and AOA of 10deg > 427N ; BHP absorbed > 3.2
Chord > 225 ; Span > 1250 ; Downforce @ 160kmh and AOA of 8deg > 574N ; BHP absorbed > 5.1
Chord > 225 ; Span > 1400 ; Downforce @ 160kmh and AOA of 8deg > 617N ; BHP absorbed > 6.3
1) To convert to kg we need to divide by 10, so for ex. 380N = 38kg
2) Those figures are in a freestream of air wich means on our car they will be smaller. Also the extremes of the wing wich hang out of the car's limits are the most efficient so in reality, the difference between 1250 and 1400 might be larger. The car has about 1050 at the upper side of the trunk lid, wich means a 1250mm wing will stick out 100mm on each side, while a 1400mm will stick out 175mm on each side !
The wings will be straight and will have endplates of course ! From what I could approximate on Supercopas and other similar racing hatchacks their wings seem closer to 150mm but they also have diffusers to help them with downfoce. From the Golf 5 GTI aerodynamic data presented earlier, the rear had a lift of 37kg @ 200kmh wich will probably be like 25kg @ 160kmh.
How would you guys judge this problem and what would you choose ?
the bruce:
I guess your thoughts are right. All these wings work. If you don't care about top
speed go for the 225 chord wings and choose span due to your taste.
You will also play with different angles and even with wing position. If rear DF seems
to be too much you decrease wing angle or probably even wanna add a front splitter
to the VWR spoiler.
mkviken:
i have the S3 engine shield
im considering bluemotion exhaust and tank and rear axle shields
do these make a real difference or is it just in the head do you think?
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