improving aerodynamics with OEM parts

[Richn83]

So I'm still a bit confused as to whether the two underfloor flanks are requiring the left and right sided "bodenverkleidung" from the original post on this topic and then you add the 1a and 1b parts on top.
Are these standard fit on Mk5 Gti's?

It looks like a good add on to me, along with the bigger under engine cover and rear parts, but wonder if others had fitted these? And if so what parts/numbers are these?

That said I'm no Adrian Newey regarding airflow..
 

The main under body panels down the side are the original ones on the car the 1a and 1b are extras they are called stone deflectors but get fitted to the bluemotion, the back end of the MK6 ones look like they are designed to be vortex generators that help to decrease flow separation, the Evo had these on the rear above the screen.

So to answer your question you need 1a 1b, you need the 2a 2b and the 4 as well as the front under-tray and all the associated fitting parts.

over the weekend on a trip to pembrokeshire and back I managed to do 380 miles on a tank with 20 range on the comp and that included a mix of driving and with a loaded up car and I still dont have the rear axle panel in place 

[the bruce]

The 3.2 VR6 is known for it's temperature problem.
You see the R32 comes fitted with the 237 P as standard.

[Bernhard30]

Good spot to notice the bigger under engine cover in that video.
That R32 was transformed into a right beast. If it was the same car...understood not one word of the clip.

Thanks for all posts that helped my recent confusion about parts, cheers guys.

[Tfsi_Mike]

Still on aero mods;

I'm trying to weigh up pros and cons of leaving the cup spoiler off for a change as the car is in for repair

After this http://www.mk5golfgti.co.uk/forum/index.php/topic,34223.msg417611.html#msg417611

It weighs a bit for what it is, what do you think if anything it's doing for me aerodynamically?
 

[the bruce]

Hard to tell, but I guess if the gap between bumper and splitter is closed
there should be advantages in both (reduced) lift and drag and increased
air pressure to the intercooler/radiator assembly.

[RedRobin]

.
At one time, due to this thread, I was seriously interested in fitting the OEM engine undertray 1K0825237P - Thank goodness I didn't! Had I done so I would not have discovered a minor leak from my DSG until a more serious and expensive problem had raised its ugly head. I keep a large piece of cardboard on the garage floor under the engine so I can spot any leaks.

I have to say that this undertray simply doesn't make sense from a maintenance point of view.

[the bruce]

A couple of screws (like stock) and three bolts do not really affect ease of maintanence. 

Of course you oil leakage unfortunately would have been ''hided'' by the undertray.
But I bravely don't fear a prob like this on my three year old Mk.V.

[RedRobin]

A couple of screws (like stock) and three bolts do not really affect ease of maintanence. 

Of course you oil leakage unfortunately would have been ''hided'' by the undertray.
But I bravely don't fear a prob like this on my three year old Mk.V.

....By the use of the word "maintenance" I mean the ability to maintain a car well by spotting and solving any problems.

A 3-year old car can leak a fluid for a whole variety of reasons - It might even be that someone didn't seal something properly. Personally I don't want any potential problems hidden. But each to their own priorities and preferences. 

[the bruce]

Don't misunderstand me, Robin. 

In your personal situation you took advantage of having no large undertray.

But there is never any 100 % safety to spot all issues. If I'd need this I had
to look under the bonnet every day or even better remove it.

[Snoopy]

Im sure the leak would have found its way out of the undertray through the vents and marked the cardboard just the same. The way oil has a habit of finding it way as it does. Does DSG oil not stink like normal transmission oil? As i would smell it a mile away if it did even if its just a small amount. It imo would never get to a bad levels without it been seen from experiences of leaks in the past.

Taking the undertray off out 2005 leon to change the oil this morning showed me how much it protects the underneath of the car from the weather and corrosion as everything behind it is spotless like new. It also stopped the alloy sump been marked from the graze on the cover.  

Any change effects something.

[RedRobin]

^
Yes, DSG oil does smell strongly but there was so little of it.

I think you make some good valid points (as usual), Geoff. So perhaps I'll reconsider this part for purely protective reasons.

How much might it reduce my 65mm ground clearance by though!?

[the bruce]

In case of my GTI the subframe is still the lowest part.

[the bruce]

For those who don't have a GTI roof spoiler:

http://www.golfmkv.com/forums/showthread.php?t=155775

(the Votex is far better than the GTI spoiler from the view of this topic)

[Richn83]

Further to what I posted up before I have just come back from holiday in France, and have with a full car managed to get over 400 miles out of a tank of 98 RON on two occasions this was supermarket fuel as well so nothing special.  With about 100 miles of N roads at 90kph followed by auto-route up over the massif central and down across the Millau viaduct, which takes you up to over 1,000 metres altitude on 3 occasions, so I'm fairly chuffed with that.

The stability of the car at speed is also better so even if you dont feel comfortable with the larger engine tray Robin the rear control arm cover off of the TT and the rear axle cover would be a good investment ~£40 of parts which will reduce the air pressure under the rear of the car and wont affect ground clearance at all.

[RedRobin]

^
Thanks Rich 

Am really short of funds right now (and the foreseeable future  ). I have to sell things to buy things.

Massif Central is great - Very unspoilt.



^ Spot the road?

Plenty more pics but I'm sure no-one wants to see my daughter and friends in the river.