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Backdraft Motorsport S3 Endurance Race Car build

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Backdraft Motorsport, Jan 20, 2012.

  1. S38P
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    S38P Member

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    [Feb 6, 2012]

    thanx for your replies..

    you said "We know the car weighs 1455kg in std trim" did you weigh the car in standard trim? i am asking this because when i removed the rear seats and replaced oem front seats with sparcos the car was still weighing around 1450! i should have weighed the car before removing anything. mine had a sunroof and leather interior as optional..

    what sort of material are you using to get a flat floor? i am also trying to improve the aerodynamics but without a rear wing..
    BTW any info on the brake specs?
    #41
  2. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Feb 6, 2012]
    I got the weight from Audi's brochure. Now you mention it I wish we stuck it on our corner weight scales before we started but it's too late for that now. I imagine that weight doesn't take into account any fuel in the petrol tank. That might be the difference? And if you have DSG that is also heavier than the manual box.

    We haven't looked at the floor design in any real detail yet but I think we will use a similar material to what we use on our Gallardos... corrugated aluminium sandwiched between two thin sheets of Ali. Light but strong enough. Like I say we aren't sure yet but once we have it done we will post it up.

    More info to come on the brakes. Just finalising some details and then we can let you all know.
    #42
  3. S38P
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    S38P Member

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    [Feb 6, 2012]
    i think this mentioned weight is without any optional equipment and without fluids.
    mine is not dsg but i have sunroof which is around +15kg.
    #43
  4. S3 Rav
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    S3 Rav Well-Known Member

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    [Feb 6, 2012]
    Great thread so far. Looking forward to this.
    #44
  5. S38P
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    S38P Member

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    [Feb 9, 2012]
    Any update / photos? :)
    #45
  6. Spin140
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    Spin140 Active Member

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    [Feb 10, 2012]
    Also subscribed, a great thread and brilliant, innovative marketing tool, I wish you well :)
    #46
  7. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Feb 15, 2012]
    Received some nice shiny parts earlier in the week... exciting times :)

    [​IMG]
    Tillett B7 carbon fiber race seat. One of the first in the country. This is the lightest FIA approved seat on the market weighing a mere 3.5kg! Next job is to position the seat bars and mounts so we can get the seat fitted...

    [​IMG]
    Wrapped up. Wouldn't want to scratch it when trial fitting!

    [​IMG]
    We have needed to make various brackets. These are part of the seat assembly. More pics to follow as the seat gets fitted...

    [​IMG]
    Purpose built FIA approved fuel tank by ATL. World renowned fuel cell manufacturers this little beauty will hold 120 ltrs so we can do long stints and avoid having to fill up every 30 mins! The original fuel tank wont be going back in the car...

    [​IMG]
    Quick release steering wheel boss & MOMO wheel.

    Steering wheel and seats from MSAR Safety. Thanks to the guys and girls there for fantastic service and assistance.
    Plenty more parts and updates to follow...
    #47
    quattro81, box500 and MartayMcFly like this.
  8. box500
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    box500 Member

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    [Feb 15, 2012]
    £170 to fill that fuel cell on super unleaded, never mind race fuel.. :icon_thumright:
    #48
  9. Spin140
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    Spin140 Active Member

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    [Feb 15, 2012]
    Think I just did a little man wee - so excited by this thread :)
    #49
  10. maddrick92
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    maddrick92 Member

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    [Feb 16, 2012]
    Wow cant wait to see the out come looks sweet up to now, that seat has got me all wet..... Haha
    #50
  11. Blueie
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    Blueie He who dears' wins!!

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    [Feb 19, 2012]
    Left hand drive???
    #51
  12. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Feb 23, 2012]
    It will be a right hand drive but we are adding a passenger seat for track days and passenger rides etc. Good spot though :thumbsup:
    #52
  13. Blueie
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    Blueie He who dears' wins!!

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    [Feb 23, 2012]
    Attention to detail ;)
    #53
  14. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Mar 6, 2012]
    Hi everyone... thought this was due an update. Things have been pretty busy at BDM these past few weeks which has meant the S3 has had to take a back seat... but here are a few photos of the latest developments.

    [​IMG]
    As I’m sure some of you might have noticed, the car was rather dirty so yesterday it was given a clean. Looks loads better for it.

    [​IMG]
    Dash has been modified and trimmed to fit nicely around the roll cage bars

    [​IMG]

    [​IMG]

    Passengers and drivers seat bars are now fabricated into place

    [​IMG]

    Sitting in good company with the 3 GT3 cars currently being rebuilt. :cool:

    So like I say, progress has been a little slow... and we still have a few more mods to do to the chassis before it’s sent away for painting but parts are starting to arrive.

    Engine build preparations are under way and the block is completely stripped. The engine rebuild will be starting in the next few weeks and I’ll be sure to post pictures and a detailed spec.

    Look forward to the next update.
    #54
  15. S3 Rav
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    S3 Rav Well-Known Member

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    [Mar 6, 2012]
    Thanx for the update. Great thread this.
    #55
  16. Phil_T
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    Phil_T Revo Stage 2+ Audi S3

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    [Mar 6, 2012]
    Great thread & your progress will prob help with future plans for my car, How much was the roll cage? did custom cages do it?

    What are your plans with the engine?

    Also other plans do you have to make it handle better?
    #56
  17. Big_Dave
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    Big_Dave Member

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    [Mar 6, 2012]
    I see your running gt3 lambos, we do all the graphics work for United Autosports who were running audi R8's but this season are running a couple of mclaren GT3. All stunning machines in race spec!
    #57
  18. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Mar 7, 2012]
    The cage was done by safety devices in Suffolk. They have done a really nice job and turned it around pretty quickly. I think they had the car for about two weeks.

    We will be posting specs and images of the engine build soon so i'll be able to tell you more about that when we get started. Same with suspension etc.

    So do you plan to make yours into a full on race /track day car in the future?
    #58
  19. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Mar 7, 2012]
    The R8's were immaculately turned out last season. You and your guys did a nice job. Never know we might see you at some of the British GT meetings this year as we plan to do a few with the Gallardo's.
    #59
  20. S3RYE
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    S3RYE Interior Next!!

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    [Mar 7, 2012]
    THAT PIC OF THE CAR NEXT TO THE GALLARDOS IS EPIC
    #60
  21. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Mar 28, 2012]
    So another couple of weeks have passed and progress is ongoing with the S3. The main focus for the past few weeks has been on the engine build. With the car being used as an endurance racer, reliability is key and we are using well known tried and tested I.E rods and JE pistons. Pictures below...

    [​IMG]
    This picture shows the engine out of the car ready to be stripped. As you can see the engine was in quite a state, but with some TLC we can make it like new.

    [​IMG]
    Stripping the engine down.

    [​IMG]
    Cylinder head removed and in desperate need of refurbishing. We will be doing full porting and flow, with new valves, springs, retainers etc. More info on the head in the coming weeks.

    [​IMG]
    Block face machined down to get the perfect finish.

    [​IMG]
    The block has been completly overhauled with a lot of time spent machining to get rid of any rust and defects. It's then painted to look as new. We are able to get a really good finish.

    [​IMG]
    Cylinders have been taken to 0.5mm oversize and are nicley honed.

    [​IMG]
    Crank gets refitted after being crack tested and polished. ARP main studs torqued up.

    [​IMG]
    I.E 144 x 20 H beam rods and JE 83mm 10.5:1 CR forged pistons preppared and ready to go in.

    [​IMG]

    [​IMG]

    [​IMG]
    Ring compressor makes sure pistons and rings go in nicley.

    [​IMG]
    Big ends are lubricated and fitted.

    So as you can see things are coming along really well. What was a tatty looking engine now looks like new, and we have a strong base engine. Things are really busy at BDM right now and the S3 will take a back seat whilst we concentrate on getting the Gallardo's built in time for the pre season testing, but when we get back the next job will be the cylinder head and we will be back on here with all the details.
    #61
    RYes3 likes this.
  22. NobberUK
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    NobberUK VAG Junkie

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    [Mar 28, 2012]
    Mmmmmmmmm oily bits! :wub:

    MORRRRE!!!!!
    #62
  23. xanderxxx
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    xanderxxx Member

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    [May 9, 2012]
    any updates yet ?
    #63
  24. Kelvin_S
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    Kelvin_S Member

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    [May 9, 2012]
    Nice, you don't need the front bumper do you? It will probably weigh you down...better sale it lol.
    #64
  25. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [May 10, 2012]
    Hi - we have been very busy with the Lambos as it was start of the Supercar Challenge beginning of April - but will be back on the S3 very soon and will make sure you are all updated!
    #65
  26. Ash187
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    Ash187 Audi-Retrofits.co.uk Site Sponsor

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    [May 10, 2012]
    cant wait to see the finished product! this thead is amazing!!!
    #66
  27. xanderxxx
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    xanderxxx Member

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    [May 10, 2012]
    looking forward to it :)
    #67
  28. quattrosport
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    quattrosport New Member

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  29. andyhough
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    andyhough Member

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    [Jul 15, 2012]
    Wow just found this thread and I'm double excited!
    #69
  30. bmh.01
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    bmh.01 Member

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    [Jul 16, 2012]
    Longshot, I don't suppose the engine cover is still for sale?
    #70
  31. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Aug 8, 2012]
    After a long delay we are back with an update. Its been busy the past few months for us. We have been compeeting in the Supercar Challenge in our Gallardo GT3 car in recent weeks at Zolder and Assen which has kept us a little quiet on the S3, but things are moving along slowly.

    After a lot of man hours on the chassis and interior the car has now been painted. Work that has been done on the chassis includes; seam welding in the engine bay and wheel arches, steering wheel position & pedal box assembly, raised gearshift platform, extra bracing to topmounts, air jack tubes in the front corners and rear floor. New fabricated bulkhead with turbo 'easy access' panel and lots of swages through out the body to try and save weight where possible.

    Pictures below...

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
    #71
  32. mjr901
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    mjr901 S3 Pollution Plus+ Edition

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    [Aug 8, 2012]
    Very good :)
    #72
  33. S3Alex
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    S3Alex Rarely neutral

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  34. warren_S5
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    warren_S5 Moderator Staff Member Moderator VCDS Map User

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    [Aug 8, 2012]
    Nice; when is it due to be built and running for?
    #74
  35. BlueSpark
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    BlueSpark 6th Gear

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    [Aug 8, 2012]
    Very nice. Cant wait to see the engine going in.
    #75
  36. Juicy Jen
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    Juicy Jen <span style="color: orange">Jen – Juicy Detailin Site Sponsor

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    [Aug 8, 2012]
    Warren's Back! :salute:
    #76
  37. Ash187
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    Ash187 Audi-Retrofits.co.uk Site Sponsor

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    [Aug 8, 2012]
    Looks good! im sitting on the edge of my chair waiting for this one!

    Warren! you just lurking and only comment on selected threads? where you been?
    #77
  38. Backdraft Motorsport
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    Backdraft Motorsport 1.8T & 2.0TFSi Specialists Site Sponsor

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    [Aug 9, 2012]
    Yeah we have been busy with it and we are pleased with the results at this stage. The doors have been drilled out and lightened as well. The pedal box foot plate took quite alot of time to design and make but we will now have an adjustable floor mounted pedal box.

    As for it's first run out, were not to sure. There is still alot of work to be done and we need to test the car as well. We are hoping it will be ready to compete in the Supersport race in the Supercar Challenge at Assen towards the end of October.

    Here is a video of the Supercar Challenge series. We run the Lamborghini Gallardo's in the GT class at the same event. (Finished 2nd in class at this meeting).
    [video]www.youtube.com/watch?feature=player_detailpage&amp;v=BKvGUMyxZIg[/video]​
    #78
  39. S3Alex
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    S3Alex Rarely neutral

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    [Aug 9, 2012]
    Will you be selling any of those parts.
    Like the pedal box for instance.....?

    Good luck for the first runs and would be nice to know roughly how much weight you've chopped out of it.
    #79
  40. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Aug 9, 2012]
    Where have you done the swaging? Is it just the doors or all panels to save weight?
    #80

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