improving aerodynamics with OEM parts

[Richn83]

I made a mistake with the number of screws and fixers I needed so at the moment I have only one of the lumps held on by two screws at the front    and the other is in the boot!  Will get the other fixers Friday and fit all properly on the weekend.

I think at 20-30mph round town I would have to say t is quieter, but its more noticeable at higher speeds where tyre noise and wind noise start to increase.

With the gap between the sump and the under tray I pushed up in the middle and there was definately some movement, could be that mine wasnt as bent as the others but dont think you need to much.

[Tfsi_Mike]

Excuse for a shallow sump 

[Tfsi_Mike]

Well today would be a great test to see the difference.  However, the wife as filled the car with "things we need" Dead weight.

Will keep a close eye on the Avg Mpg and stick to 70 on the autobahn.  I know a very sensible run to Hanover saw Avg 38, shame I havent got Highline and the Fandangle polar+ 

[Richn83]

Good luck with the drive Mike be interesting to see what you get on your long run!   

[Snoopy]

Rear stone guards are a dead simple fit.  Was just the pin holding the brake cable holder was an arse to get out.  

From your pic it doesnt look like you've fitted the metal clips & screws at (x2) at the back of the 'lumps / triangles' or was you just snap happy and pictured before finished?

Mike
Did your rear handbrake cable guide look like mine did or was it on metal clips on the top of the arm?

Metal clip on top of the arm (mk5 golf) (middle right of the photo)


Big plastic V shaped cable guide (mk6 golf) (bottom right of the photo)

[Richn83]

I believe his was on the plastic clip like yours.

[Richn83]

Anyone able to provide an ETKA exploded diagram from the rear end of the new Passat blue motion?  I had a poke under one the other day and they had a half plastic half metal rear tray from the rear axle through to the back end of the body it sealed off the exhaust and right round the rear was wondering what could be done to mod it on to the GTI!

[the bruce]

Found just this:





 

[Richn83]

Thanks Bruce, I actually ended up with 12 instead of the rear part for the golf, it is a bit of a pain as I think it will just about foul the exhaust but plan to try fitting it once I get a second bracket and have some heat shielding I dont have a picture off it at work, but the lip up that should go up to the rear axle frame is right where the exhaust comes through.

The part 21 could well be the right part, the diagram doesnt look as big as what I saw under this car, but the diagrams arent always as up to date as the parts I guess the different PR codes might determine the size based on exhaust and saloon and estate.  I need to get back under the rear end of a bluemotion and take some pics I didnt feel I could in a public car park as the owner might turn up and wonder what I am doing under his brand new car! 

[the bruce]

http://www.racecar-engineering.com/articles/technology/can-dimpled-aerodynamic-surfaces-reduce-drag/

http://www.racecar-engineering.com/technology-explained/diffusers-engineering-basics-aerodynamics/

 

[Richn83]

Very interesting articles, I still need to fit part 12 in the diagram above




The clearance to the exhaust is marginal on the left rear bracket



But think if I can get it to fit (with some heat-shield) then the extra length could be worth the hassle... 

[Richn83]

So I havent been back near a passat with a camera but I have found these pictures from a passat on an american car of somethign approaching the right parts.





which would seem to look like some form of under-body panel for the rear....

which is an earlier part revision to your diagram above for the previous generation passat:

21   3C0 825 216 B   underbody lining   right rear   1   PR-1X0

In the first picture there also looks to be a full central piece of trim as well that doesnt appear on the ETKA exploded diagram.

[Tfsi_Mike]

All you need to do now Rich is cover your car in grease and never use your aircon and it'll be super efficient 

Need to fix that flippin front under tray 

[Richn83]

All you need to do now Rich is cover your car in grease and never use your aircon and it'll be super efficient 

Need to fix that flippin front under tray 

LOL thanks Mike!    I just dont see the point of wasting fuel poutling up and down the motorway so I can save it for the A-Roads!

[vwdubster77]

Very interesting articles, I still need to fit part 12 in the diagram above




The clearance to the exhaust is marginal on the left rear bracket



But think if I can get it to fit (with some heat-shield) then the extra length could be worth the hassle... 

Hi Rich,

That part (3C0 501 713 A) is also available on the MK6 Golf, same part number but doesn't have the suffix A, so it may be worthwhile seeing what parts are needed or available from the MK6 or how the exhaust is routed so it doesnt foul the cover?

I remember seeing it on a MK6 Golf Variant Bluemotion, but didn't pay any attention to routing of pipework etc.

Whats confusing is that on ETKA the picture is of the older part fitted to MK5's, but the part number refers to Passat (3C0), also on ETKA there are 2 part numbers: 1K0 501 713D and also 3C0 501 713 listed for Golfs and Jettas

Regards.

Baz