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Author Topic: Improving aerodynamics with aftermarket parts  (Read 50280 times)

Offline Richn83

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Re: Improving aerodynamics with aftermarket parts
« Reply #15 on: February 04, 2012, 05:00:34 pm »
interesting to see the audi control arm covers appearing on one of those race cars!
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Offline the bruce

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Re: Improving aerodynamics with aftermarket parts
« Reply #16 on: February 04, 2012, 10:31:59 pm »
Right. I know the owner and driver of this car and I may have inspired him
with talking about this topic for some years. At least I hope so. This Golf
is one of the fastest Golf TDIs ever on the Nordschleife. From origin it has
been a Golf TDI Cup car before (which Volkswagen did in Poland).

ps:
of course the lower arms change position when the car stands on it's wheels  :wink:
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Offline fuscobal

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Re: Improving aerodynamics with aftermarket parts
« Reply #17 on: February 05, 2012, 01:45:42 pm »
Hmm, knowing the front wheels seem to bring a lot of drag and lift, maybe a well designed air-dam/splitter can also deflect the air around the wheels. As I can see from your graphs Bruce, if you find a way to deflect air around the front wheel you can have a huge benefit in both drag and downforce !
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Offline the bruce

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Re: Improving aerodynamics with aftermarket parts
« Reply #18 on: February 05, 2012, 04:12:47 pm »
Just buy a pair of the small spoilers that are in front of the rear wheels and fit them
in front of the front wheels. I would not fit bigger ones as this may weaken brake
ventilation (unless you have some ventilation hoses).
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Offline Richn83

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Re: Improving aerodynamics with aftermarket parts
« Reply #19 on: February 05, 2012, 05:47:03 pm »
From what I've read you need to avoid to big a dam in front of front wheels if you have a large overhang in front of it as you can add a significant front lift, so if you fit them as far forward as possible or limit the size.

You could fit two smaller ones like on the front of the new mondeo or focus.
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Offline the bruce

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Re: Improving aerodynamics with aftermarket parts
« Reply #20 on: February 05, 2012, 07:01:31 pm »
Yes, such wheel spoilers can cause lift as the are fitt closely to the wheel (while still reducing drag).
You can just fit some cheap plastic profiles to the frontal edge of the front lip but these parts do
live quite dangerous on a daily driver. And keep in mind front lift isn't any issue on a GTI.

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Offline fuscobal

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Re: Improving aerodynamics with aftermarket parts
« Reply #21 on: February 08, 2012, 01:34:47 pm »
Info about the VwRacing air-dam added to my topic here > http://www.mk5golfgti.co.uk/forum/index.php/topic,12484.msg492709.html#msg492709

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Offline xht20

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Re: Improving aerodynamics with aftermarket parts
« Reply #22 on: February 13, 2012, 02:00:26 pm »
A good airdam IMO is the one from Opel/Vauxhall Corsa OPC Nurburgring Edition

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Offline mkviken

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Re: Improving aerodynamics with aftermarket parts
« Reply #23 on: February 13, 2012, 06:22:55 pm »
that looks similar to the maxton design one for the mk6 gti

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Offline the bruce

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Re: Improving aerodynamics with aftermarket parts
« Reply #24 on: February 14, 2012, 09:51:12 am »
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Offline rex

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Re: Improving aerodynamics with aftermarket parts
« Reply #25 on: February 14, 2012, 04:37:14 pm »
Don't worry bruce, we'll get there even if it's harder  :smiley:.
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Offline fuscobal

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Re: Improving aerodynamics with aftermarket parts
« Reply #26 on: February 17, 2012, 10:08:12 am »
Actually Bruce's adice is very good. I'm thinking that wing is very similar to the Reverie ones but much lower price. If we can find one over ebay that has not been damaged, it may be the way to go ! Who cares it's a Lotus wing ?...it looks just like the Reverie straight ones but it's even larger 250 x 1500 vs the 225 x 1400 that I wanted to buy from Reverie !
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Offline rex

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Re: Improving aerodynamics with aftermarket parts
« Reply #27 on: February 18, 2012, 08:27:46 pm »
Quote from: fuscobal on February 02, 2012, 10:32:56 pm
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 ...


Well guys, after searching for solutions for the rear spoiler both fuscobal and myself are seriously considering buying a Reverie wing and manufacturing the mounts(supports) for the wing.
Now, the issue is that these mounts have no obvious fixing points.
I am thinking of using the OEM trunk hinges.







As you can see, if I am to use the OEM hinges I would have to cut through the rear spoiler (through 2 metal sheets).
My questions are:
1. do you guys have any other ideas for mounting the rear wing? Do you know how other Mk5 enthusiasts mounted their wings?
2. is it possible to cut the brake light cable when drilling the spoiler? Do you know where the line go through?

Cheers!
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Offline the bruce

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Re: Improving aerodynamics with aftermarket parts
« Reply #28 on: February 18, 2012, 09:01:56 pm »
Impressive ambitions !!  :drinking:

Just two ideas:

- glueing alloy brackets to the rear window that distribute pressure sufficiently
- purchase used rear lid, weld a bracket to it and change lid before trackdays

It even wouldn't need any wiper w/ motor, inner panel etc. . . .  :wink:
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Offline rex

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Re: Improving aerodynamics with aftermarket parts
« Reply #29 on: February 19, 2012, 09:25:29 am »
Thanks Holger!

- the gluing part is a good idea. From the prohots the Scirocco seems to do that also. I guess we'll when we design the mounts.
- I also thought about buying a used rear lid but I think it makes everything more complicated... I might go this path if I find a trunk lid with Privacy Glass and at a reasonable price. But I might be using this on winter/summer bases, not installing it before every track day.

 :drinking:
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