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Prawn and BigAls A3 Track Car

Discussion in 'A3/S3 Forum (8L Chassis)' started by Prawn, Dec 29, 2010.

  1. 16Klappe
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    16Klappe Princess Slayer

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  2. Prawn
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    Prawn My other car is a MINI!!!!

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    All input is good man :)

    the Original plan was for something similar to the skirts shown on that E30 (?), but further thinking has changed plans a little.

    By adding a large front splitter, and THEN a deep vertical side skirt, you're almost totally sealing off air from getting in under the car on the move.

    This would almost certainly create a pretty epic ground effect, like Nige has, and give incredible handling on a perfect track, but it also narrows the margin for error if you were to lose that ground effect for any reason at speed.

    if you ran a skirt that was 20mm off the ground, then went over a 20mm bump and the car lifted, your 20mm gap would double to 40mm, 100% extra, so the amount of air able to come in would in theory double momentarily and you'd potentially lose a lot of your down force.

    if you ran at 100mm, the same 20mm bump would only give you a 20% increase in the gap, not nearly so drastic.

    i've noticed from a few clips that Nige has had fairly 'interesting moments' when he's hit bumps at speed, such as around churches at Thruxton at 120mph trying a new line, it let go in a pretty big way and he stopped about 200m down the track and 50m into the infield - rather lucky.

    For that reason, I think what will happen, is that the flat underside I create will continue outwards, stopping air on the side of the car from curling round under the car, but probably no physical vertical skirt due to the potential risks.
    S3Alex and bigal 1 like this.
  3. Jason.s
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    Jason.s Active Member

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  4. 16Klappe
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    16Klappe Princess Slayer

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    Prawn had this discussion earlier on another forum.

    And concluded that when he has to take the car to the track on a trailer he will regard it as utterly ruined haha.

    I am trying to imagine the under floor aero, and will do some googling to further my knowledge. My gasp on aerodynamics is minimal, which goes for 97% of people.
  5. Prawn
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    Prawn My other car is a MINI!!!!

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    You're not the first person to say that, many people are surprised that we still drive it to all events.

    I sure did :)

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  6. Prawn
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    Prawn My other car is a MINI!!!!

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    it would be NICE to trailer it to track days for sure, so long as it wasn't forced upon us.

    Trailers are big money though, and our trailer is Mini sized only, saxo at a push!
  7. Westy
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    Westy Double Dark Side! Diesel & 8P

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    Not to mention you also need a vehicle up to the task of towing it!
  8. Prawn
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    Prawn My other car is a MINI!!!!

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    what, you mean the Fiesta Zetec S i've got coming isn't up to the task of towing the A3? :sos:

    Dads TDI would probably tow it (until we came to a Hill), but it lives 200 miles away, so no huge advantage there!
  9. kwistof
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    kwistof South East Events Moderator Regional Rep

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    + a licence if the towing vehicle, the trailer and car/vehicle your towing totals over 3.5 tonne plus the trailer needs to be 750kg or less.

    Or you may already have all that gubbins if you passed your test some many years ago :) (pre 1997 IIRC)
  10. superkarl
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    superkarl MAN OF STEEL

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    i NEED to know more about this!
    that looks like an old 5 banger in there longitudinally
  11. Jason.s
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    Jason.s Active Member

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    Dont let the aero take over though. Its not like it NEEDS it. You dont race in hillclimbs or Time Attack so its not required. Im guessing its more for your own interest and to see if you can make it work for minimal effort and cost?

    Personally i think what you`ve done is plenty. Possible look at futher weight reductions where possible. Any more left to do to the chassis and then a PROPER geo/corner weighting session (which you`ve mentioned recently so good)
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  12. Prawn
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    Prawn My other car is a MINI!!!!

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    You're right, it's fast as fook already (for me!), and handles a treat now, with the wing alone it wasn't quite right, and I feel with the splitter alone it wouldn't have been quite right. Any further additions to the underside to focus on getting air out smoothly will act on the whole chassis and underside so shouldn't effect balance at all, just an all round increase.

    the aero is more about having something to fiddle with, and something low cost to experiment with as well, given how little the splitter cost to produce, the gain / cost ratio makes it quite possibly the best thing we've ever done to the car.

    Full geo and corner weighting was discussed with Robin on Saturday, and will take place over winter when I'm 100% sure that all changes to ride height, aero, and such things are finalised :)
  13. Sam_
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    Sam_ Down under

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    I'm thinking of going to the WTAC here this weekend. They take it to a new level...

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
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  14. Jason.s
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    Jason.s Active Member

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    I love Time Attack stuff. Its utterly rediculus and insane but its so so epic at the same time. The money that goes into it is silly though and it costs a fair bit to take part hence why its mostly companies that do it.
  15. Powelly
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    Powelly Member

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    Haven't been on here for a good 6 months but now I'm getting my A3 back on the road I thought I'd pop by, Prawn I thought the car couldn't get any better but I've just caught up on it all all it looks brilliant, it has got to be te best A3 in existence and its a huge credit to all the hard work you have put into it! Keep it up :)
    bigal 1 likes this.
  16. Jason.s
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    Jason.s Active Member

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    Just to drop this in there... They've just posted a video on Facebook of this driving on first role out and its FCN EPIC
  17. 666markyboy
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    666markyboy Active Member

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    link ?
  18. Jason.s
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    Jason.s Active Member

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    welshy_s3 and Vorshprungdork like this.
  19. bigal 1
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    bigal 1 Active Member

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    Looks and sounds fantastic.
  20. Danny Cawsey
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    Danny Cawsey Cawsey

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    That looks awesome hopefully more footage will be uploaded soon :)
  21. Prawn
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    Prawn My other car is a MINI!!!!

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    1500 miles, 2 trackdays, and not a mark on it.

    Then the lads at the local carwash go and break the air damn on the splitter!

    [​IMG]

    Great - thanks lads. the one time I decided to go back there for a quick clean, they denied it was them, but it wasn't broken when I left 5 minutes before, and there were bits of their yellow wash mits hanging on the broken edges.

    No cost involved, got loads of spare material for the dam, but it's a bloody nuisance! The air dam and the arch fence are broken.

    :(
  22. Prawn
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    Prawn My other car is a MINI!!!!

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    On the plus side, it still looks cool, so it's OK

    [​IMG]
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  23. Prawn
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    Prawn My other car is a MINI!!!!

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    Went out with Tony this morning to take a few pictures, Will add more later and a link to his page, but as a starter, I appear to have been accidentally caught in this shot looking unquestionably like an untrustworthy youth :laugh: just as I thought I was getting old :racer:

    [​IMG]
  24. Prawn
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    Prawn My other car is a MINI!!!!

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    So, this morning I went out for a drive with Tony from Deutsch Erbaut: https://www.facebook.com/pages/Deutsch-Erbaut/161541943994053?fref=ts / Deutsch Erbaut

    We found a few cool locations, and took a few pics of the cars together, Tony has a lovely Leon that I've done a bit of work on with him at various times. Was fun cruising around in 2 similar cars :)

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    really good fun, thanks Tony :) And didn't use as much fuel as normal car activities :laugh:

    Full shoot can be found here: Deutsch Erbaut > Audi & Leon Track Car Shoot
    Last edited: Oct 21, 2013
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  25. Sam_
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    Sam_ Down under

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    Saw this at the weekend, pretty epic front aero setup :)

    [​IMG]

    [​IMG]
  26. Prawn
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    Prawn My other car is a MINI!!!!

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    Last edited by a moderator: Aug 15, 2014
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  27. Sandra
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    Sandra MODERATOR Staff Member Moderator

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    ​Car sounds awesome Nick. :)
  28. bigal 1
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    bigal 1 Active Member

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    And all on a Sony 7.2 mega-pixel hand-held camera. Just like a few shots from from Spa to follow later.:yes:
  29. jamiebennett81
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    jamiebennett81 Active Member

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    Glad you enjoyed the day mate

    Few favorites of mine (in fact most of them have come out really well)

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
  30. ScottD3
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    ScottD3 I want your faulty electronics

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    Sure?

    Make: Canon
    Model Canon: EOS 500D
    Lens Model: EF-S18-55mm f/3.5-5.6 IS
  31. Prawn
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    Prawn My other car is a MINI!!!!

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    He means the little video clip, Canon is Tonys camera :)
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  32. ScottD3
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    ScottD3 I want your faulty electronics

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    ahhh.
    I had to double check cause the pics are good and I was really surprised at first thinking it was a little sony camera. lol
  33. Prawn
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    Prawn My other car is a MINI!!!!

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    Would be a miracle :laugh: Even BBD isn't that good
  34. peterg60
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    peterg60 Member

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    just read all this thread epic build m8. this had inspired me to go tfsi turbo in the mk1 keep up the good work m8:superman:
  35. bigal 1
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    bigal 1 Active Member

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    Hey, where are the clips from Eau Rouge, (with my sony hand held 7.2 megapixel camera.) !!!
  36. Westy
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    Westy Double Dark Side! Diesel & 8P

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    I love this shot. So Motorsport.
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  37. bigal 1
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    bigal 1 Active Member

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    It was taken with a Sony 7.2 megapixel, hand held camera. ???
  38. superkarl
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    superkarl MAN OF STEEL

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    I DESPISE it...out of complete jealousy
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  39. Prawn
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    Prawn My other car is a MINI!!!!

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    Enough about the bloomin' camera already, How much wine have you had BBD? :laugh: I'll get the clips up when I've had a chance to edit them together and upload them from the laptop :racer:


    Cheers SK. I'll be the jealous one soon enough, winter is comming, the season of wheelspin from November - March! Joy!
    superkarl likes this.
  40. welshy_s3
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    welshy_s3 Member

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    What wheels are they Prawn?

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