All Things Mk5 > Performance Modifications
Improving aerodynamics with aftermarket parts
the bruce:
Thanks for this link. :happy2:
--- Quote ---Bespoke body panels add a sporting, muscular image to rival the Clio V6 - especially from the rear, where it has a huge aerodynamic diffuser under the bumper. Those custom panels are bigger than on the standard version, too - although they need to be to house the 10mm longer wheelbase and 5cm increased track of the 197.
The changes aren't only for visual impact. That diffuser really works, and can add up to 70kg of downforce.
--- End quote ---
Well, they speak about "up to 70 kg", so it seems this is at top speed (or downhill).
Next question is it the rear axle downforce value (which I don't believe) or just the
amount which the diffuser adds to whole aerodynamics. So there may be some lift
at the rear roof (as always on a hatch) and up to 70 kg downforce at the diffusor
which may give a total near zero lift.
A by far better value than on a Golf of course. :wink:
mkviken:
its definitely better. the RS 197/200 is a seriously good handling car and the brakes actually give some confidence, unlike the golfs! :sick:
the amount of debris you get under the car is crazy on the 197/200 though. i had to remove mine a few times to clean all the wildlife out from it!
fuscobal:
Wow, very good info Bruce. It's for the first time I see the downforce numbers for the Golf GTI. The 2kg of lift on front could probably be negated by the VwRacing air-dam (wich I've already ordered by the way) and maybe even have a little downforce. Does anyone have an idea of how much downforce can an air-dam bring to a street car ? (I know it may vary a lot from car to car but a medium value would give us an idea). s for the 37Kg on the rear, we probably need a large wing to negate that and add downforce. I tried contacting VwMotorsport and Becker Carbon but no answer so I would look into Simon McBeath wings (made by Reverie & DJ Racecars). Some links for these :
1) http://www.djracecars.com/carbon-fibre-wings-and-aerofoils.asp > 100mph, 1400mm span wing downforce data > http://www.sm-designs.ndo.co.uk/images/singleDfvalpha.gif
2) http://www.reverie.ltd.uk/225mm_chord_wingdata.php > very nice data of downforce vs drag vs BHP absorbed vs angle of attack vs span ...
3) http://www.sm-designs.ndo.co.uk/ > Simon's website from UK > This guy seems to have a huge background in wing design. Look at the cars he did until now !!!
PS : The downforce of the Scirocco Cup can be without doubt bettered because those cars are limited by their category. The wing cannot be installed higher than the roof of the car or further back than the rear bumper wich limits its effectiveness. They may also have a limited span. I would do a wing wich looks more like this one >
mkviken:
I quite like the look of the gurney strip for the spoiler. Wonder is any European manufacturers make one?
http://www.vary.co.jp/reife.html
I like th look of this too but don't know what the quality would be like and if it would actually make a difference
http://www.ebay.co.uk/itm/110717469037?redirect=mobile&autoredirect=off
the bruce:
Fuscobal,
You know I had 5 kg + 35 kg in my mind, but compared to 1.4 to of a complete Golf it's almost the same.
Many people tell about the rear feeling light at high speeds. When braking it is light on rear !! :grin:
I strongly believe I already have (very small) downforce on front with my Votex + undertray + lowering.
I guess the VWR should give you ~ 5 kg. You are already lowered as well, so you'll have some downforce then.
Yes, the Scirocco R Cup uses the OE Votex rear wing which has to be mounted in a TÜV conform position.
It does not givve the amount of downforce on these cars possible with a higher position and steeper angle.
Keep in mind a diffuser is more efficient than a wing. A well designed diffuser provides both downforce +
reduction of drag at the same time. Any wing will allways produce some drag as well.
But there's also a good point on this: drag produced on top of the car will lift the front (by a small amount).
So not only the wing's downforce, but even it's drag will optimize front/rear balance.
If you like to mod your exhaust (eliminate rear exhaust for example) I'd consider a diffuser as well. The Clio
RS diffuser seems even small enough to combine it with the Milltek Mk.VI exhaust:
If you watch the GTI24 pics carefully you will recognize the small 'spoilers' on the sides
of the rear window:
All Sciroccos come with it from factory:
and even many other cars:
Renault Scenic and many more as well . . .
Why not the Golf?
ps:
I was looking for a roof spoiler similar to the Vary/Reife, but never could find one.
If you have a Mk.VI be happy to have a much more efficient rear roof spoiler from
factory than the M.V came with.
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