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Reflex Silver Golf GT Sport .:R-Line 1.9 TDI - 200k km reached

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Shoduchi:
Pic from the Golf mk6's climatronic with Jetta mk6's frame fitted:


Some random pics:






Ordered a set of LED puddle lamps: http://www.aliexpress.com/item/2x-Error-Free-LED-Under-Mirror-Light-Puddle-Lamp-for-VW-Golf-5-Mk5-MkV-Passat/1830257334.html.

Cheers

Shoduchi:
Pics to update the fitting of the Bluemotion's rear lining:




Parts list:
-Left rear lining (1K0825206A)
-Bolts x3 (N10354602)
-Rear axle cover (1K0501713D)
-Bracket (1K0501682)
-Bolt (N90548305)
-Nut (N90183802)

For older models you'll also need to fit this bolt (N91001101) to support the rear axle cover:


It should be something like this:


Cheers

MikLSP:
Any idea how much drag reduction these offer?

Shoduchi:

--- Quote from: MikLSP on September 28, 2014, 10:38:44 am ---Any idea how much drag reduction these offer?
--- End quote ---

Well, not sure about the exact figure. For what I've read the drag reduction should be at least 0,01.

Most info came from this topic: http://www.golfmkv.com/forums/showthread.php?t=163575.
The rest from online searching.


--- Quote ---Golf GTI Mk5
Front axle lift at 200 km/h: 2 kg
Rear axle lift at 200 km/h: 37 kg
Drag coefficient cd: 0,33

Golf Bluemotion Mk6
Drag coefficient cd: 0,298

Golf Bluemotion Mk7
The car’s spoilers and other aerodynamic tweaks such as underfloor panels have cut the car’s drag factor from 0,29 to 0,27, helping it to slice more cleanly through the air.
--- End quote ---


--- Quote ---The design of the underbody is 40 % of the total drag of a modern car!!
A flat underside will always reduce both drag and lift. So the stock underside of the GTI creates both.
Without a wind tunnel we cannot state the amount of improvement but it it will be an improvement. Flatter is better in this area.
We cannot exactly state the resulting lift front and rear (but I promise at 200 km/h it's around 0 front and 250 N rear). No real downforce of course, but better than stock though.


At high speeds "aerodynamic drag" is the main drag factor. Reducing it by a low margin has large effects on dynamics and economy. Also there is "aerodynamic lift" causing instability.

Lift isn't any problem the Golf's front. 
It's got nearly no lift (about 50 N/5 kg @ 200 km/h) at front. The rear is an unequal problem like it is with all hatches. The stock Golf V GTI produces about 350 N/35 kg lift @ 200 km/h, the Mk.VI as well.

That's much more important because the cars's tail is lightweight and when braking hard it's even much more light. Some of You may have experienced that by their own.

Don't expect wonders, but there's a slight improvement possible for very low budget.

The point is the Golf has almost zero lift on front, but some lift on rear at higher speeds.
Drag is quite significant but it's hard to reduce. I have some ideas though and I did some (and will do even more) mods I hope to reduce lift on rear as close to zero as possible.

Conclusion:
While the GTI (both Mk5 and Mk6) has very low front lift, it has some significant rear lift and mediocre drag.
Rear lift causes unsettling when braking from higher speeds, drag increases fuel consumption.
--- End quote ---

It's also possible to fit the A3 and TT 8J rear arm covers but not sure if I'll go that far with improving my Golf's aerodynamics. :laugh:


--- Quote ---Rear arm covers
(x1) 1K0 511 539 E - Stone chip guard
(x1) 1K0 511 540 C - Stone chip guard
(x4) 8E0 825 267 A - Spreader rivet
(x2) 1K0 609 734 C - Brake cable clamp
(x2) N 102 854 02 - Bolt
--- End quote ---

MikLSP:
Nice info, thanks

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