Prawn and BigAls A3 Track Car

Prawn said:
Thanks Bill. I thought that was the case but wanted to be sure.

Do you still run the stock master cylinder? Just with the ABS removed and the MC plumbed direct to front and rear sytems with the bias valve to reduce rear line pressure?

With my ABS system still fully active my bias is still controlled electronically. I'm pretty certain it's reducing the rear braking effort too, because when the controller failed and the EBD was no longer active the rears locked very easily even in road use.
Click to expand...
yea no abs, just twin bias valves for rear lines
 
Something for me in the future I think.

Currently ABS works well, the car stops very well, and it's actually a fairly nice aid to have in the wet!

One day I'd like to re-route and renew all the pipes though, so I think that'll be the time to ditch the ABS and add a bias valve.

Just need to work out how to stop the clocks from going mad with warnings when the ABS is unplugged!
 
Prawn said:
...Just need to work out how to stop the clocks from going mad with warnings when the ABS is unplugged!
Click to expand...

Insulating tape :)

I think as long as the module is disconnected then the worse you get is a no comms fault or missing message or similar...

Easy enough to test... unplug the ABS unit electrically... see what comes up...

Fairly sure you can code out ABS from the ABS unit (turn it off) but clocks would still need to see it... maybe a way to code it out on the clocks too I would imagine

<tuffty/>
 
I've done that PT, when you unplug the ABS it goes mental. 3 warnings beeps on ignition and a full DIS screen flashing warning. Then repeated beeps every 30s or so to remind you there's a brake system fault!

Not sure how to go about coding things out on 3.8 like you can on ME7. and I know what your next statement will be based on that :laugh:
 
Mildly Off topic have you looked at ABS module on VCDS, you can see all the wheel speeds for the 4 ABS sensors in Km/h.

Highly entertaining to see how different you can get wheels speeds...... :jester:
 
I've not seen that no :laugh:

Sounds entertaining!

I once managed to get my astravan speedo off the clock in the snow, with the handbrake on :laugh:
 
  • Like
Reactions: Vex182
Prawn said:
I've done that PT, when you unplug the ABS it goes mental. 3 warnings beeps on ignition and a full DIS screen flashing warning. Then repeated beeps every 30s or so to remind you there's a brake system fault!

Not sure how to go about coding things out on 3.8 like you can on ME7. and I know what your next statement will be based on that :laugh:
Click to expand...

Soft coding would be done in the ABS module and the instruments module mate...

superkarl said:
WIDEBAND CONVERSION
Click to expand...

^^^^.... and what he said!! ;)

<tuffty/>
 
Thanks PT.

I don't see anything in there about bulb warning lamps, only pad wear and washer fluid and that stuff, but I guess I could change the first 2 digits to zero and see if it goes away totally!

As for coding out ABS, I didn't think my car had a CAN system being a 98 on ME3.8?
 
Prawn said:
I've done that PT, when you unplug the ABS it goes mental. 3 warnings beeps on ignition and a full DIS screen flashing warning. Then repeated beeps every 30s or so to remind you there's a brake system fault!

Not sure how to go about coding things out on 3.8 like you can on ME7. and I know what your next statement will be based on that :laugh:
Click to expand...

Lol, it only does that if you pull out the ABS fuse and disable the whole system.
Simple solution is to just unplug a rear ABS sensor.

The ABS light comes on and ABS is off but it doesn't freak out because it can still talk to the module.

Then you can lock up all 4 wheels at 80 mph if you wish.

I need to do more research to see if you can edit the ABS in the hex code of the immo 2 cluster or in the Ecu bin file.
 
antwan64og said:
Lol, it only does that if you pull out the ABS fuse and disable the whole system.
Simple solution is to just unplug a rear ABS sensor.

The ABS light comes on and ABS is off but it doesn't freak out because it can still talk to the module.


I need to do more research to see if you can edit the ABS in the hex code of the immo 2 cluster or in the Ecu bin file.
Click to expand...

I'm talking about removing the system entirely ant, including the module and pump in the bay
 
Prawn said:
I'm talking about removing the system entirely ant, including the module and pump in the bay
Click to expand...

If I find the hex code to remove it I'll let you know anyway but if you want it off for a track day or whatever just unplug a sensor.
 
  • Like
Reactions: Prawn
prawny why you asking about turning the bulb warning system off??

i removed my centre brake light and it beeps everytime i hit the brake pedal.
no biggy just v annoying and it displays it!!
i asked on here was and was told its not possible on vcds
however you can do it but requires modding a circuit board some how.
 
I have a Bizzare and intermittent 'brake light bulb' warning Daz.

The brake lights work fine, and ways have done, but I get the bulb warning randomly a lot. Sometimes it'll happen once a week. Sometimes it'll go off every 20s and drive me insane!

Never found the cause of it.
 
also id be very intrigued to know how the car behaves without abs
so you are saying one day you may try it?

prob best i keep mine tho for a while but would be good to get your view on it.
 
daz help us!-) i also have the most annoying fault ive ever had on any car! i read that aud a6 have a black control box in the boot that suffers water ingress and condensation causing this fault... do we have a black control box??
 
ill see my car tomoz or mon so will take a peek
pm me more info what im looking for man!
 
Happy Easter chaps!

I THINK I have found motoring heaven, just 5 miles from my house!

 
  • Like
Reactions: kanecullen89, Mrharris2 and superkarl
we done get many 9.6 mile long country roads in watford lol
so think yourself lucky!!!
 
We get plenty in Devon/Cornwall, unfortunately most of them you end up running in to a tractor or lorry every few minutes :(
 
  • Like
Reactions: craigt1985
yeh but most of US have enough power to go round them lavis
:moa:
 
Very little traffic on this one I found, and LOADS of very open clear overtaking places too. It really is awesome.

I started making some brackets for the new wing yesterday. Then this morning, over breakfast, I decided I wasn't happy with the welding, so did some destructive testing. - it broke.

Going to grind it back and weld again this evening after a bit more practise with different settings.

Glad I decided to try and break it, because I'd be ****** upset if it let go and ripped off my nice new carbon wing on track instead!
 
  • Like
Reactions: A3-Lee
Prawn said:
I have a Bizzare and intermittent 'brake light bulb' warning Daz.

The brake lights work fine, and ways have done, but I get the bulb warning randomly a lot. Sometimes it'll happen once a week. Sometimes it'll go off every 20s and drive me insane!

Never found the cause of it.
Click to expand...

Lol, I tried LED's this happened, I swapped back the bulbs and it still happened, WTF, I'm just resigned to the fact that this is one of the querks of the car :audibash:

That's a nice private road that you have there, looks like the Isle of Man to me (i.e. no speed limits) :racer:
 
  • Like
Reactions: Prawn
I assume you won't be using any if the standarda3 clocks or ecu john?

Would be amazing to start from scratch on a bare shell build, but I can't see that happening any time too soon!

I went out for a little blast this evening.

Bumped into a familiar face at the watering hole:



It was such a beautiful evening, perfect for a good evening drive to the pub! Me in the a3 and Andy and Emily in the Bentley :laugh: classy convoy!



We met Jardo, mowgli, Tony, and several others at the pub.



Much fun was had, ending in jardo and I having a cracking blast home down the 272.

Summers evenings - awesome :racer:
 
  • Like
Reactions: Lavis89
Prawn said:
I assume you won't be using any if the standarda3 clocks or ecu john?

Would be amazing to start from scratch on a bare shell build, but I can't see that happening any time too soon!
Click to expand...


Not planned on changing them yet. Going to plug everything back in and see what happens. Then I'll remove bulbs and buzzers if need be lol...
 
Today, I made some more progress on the wing :)

It stated last week with some uninteresting marking up of centres and offsets etc:



A few plages were cut and taped into place, then some more CAD was used to make up the lower part of the new brackets:



This was transfered to steel, and carefully centres on the base plates before welding:



I couldn't get the welder set up right for some reason, and it just didn't seem right.

I ground the shoddy looking welded back so it looked half presentable, but wasn't keen on the strength, so decided to destructively test one of them.



Just as well I did that! It broke fairly easily!

More welding practise required. An auto dim mask borrowed from Andy, and lots of time spent chatting to Nige about welding technique (thanks!)

Getting there slowly. A considerable improvement on the last lot!



After a bit of practise and setting up, I had another go on the wing brackets. It's still far from perfect, but these won't be seen, and they're plenty strong enough now!




This was offered up to the roof. I altered the setup so that I could use the existing holes in the tailgate for the old wing. This allows us to revert to the old wing of this one doesn't work, and also saves on further nasty unused holes on the bodywork!

Bolts here are very much temporary.

 
Moving on to the wing itself, the tabs that came with the wing to mount it to the supports were pretty poor. They didn't fit well, didn't sit squarely, and the threaded inserts bonded into the wing didn't sit too squarely either. On the whole - could be better!



I decided not to carry on with these, and set about making my own.

CAD again:



Into steel:



Corners radiused to allow the turn buckles to move:




Offered up:



I wanted this to be perfect, so spent a lot of time marking and measuring before going any further.



I taped the new tabs into place and re-joined the centre lines for the holes:



I was kindly granted use of the kitchen worktop until 6pm :laugh:



All drilled and bolted up perfectly first time:



I offset the rear tabs from the front. The front tabs will bolt into the sides of the main mounts, yet the turn buckles will straddle over the main mon tax so to keep everything vertical in offset these:



Mich more progress was made today, but it's late, and I need sleep, so more to come tomorrow!
 
so, Just for Leigh:

#BigGayWingV2

Lots of marking was done. Lots of measuring, and everything checked twice before any final holes were drilled in the tailgate.



The top 2 brackets are now drilled, and held here with temprary bolts. I'll either countersink and flush in some bolts, or buy some half smart dome heads if I'm feeling lazy.

Lower brackets at this stage are measured up and taped into position. They won't be drilled and finalised until I have the finished brackets ready to install permanently.



With these in place. It was time to work out the wing position.

Research has told me, that ideally, the wing wants to be as high up, and as far back as possible.

Something like GobStopper 2 demonstrates this nicely:

olly2.jpg


However, there comes a point where it's just too high and too far back, and despite working well, it looks Utterly rediculous. Imagine Gobstopper 2 in the Sainsburys carpark.....

I wanted it above the roof line in the air flow, but it's worth noting that airflow at this point won't be horizontal, it'll be following the line of the roof, which is on a slight downwards trajectory at the back of the car.

To ensure the wing sat above this roof line, the obvious answer was to stick something solid on this line, and rest the wing on it.

Enter - Wood!



2 bits of timber, 40mm thick. Ensuring that the lowest part of the wing sits 40mm above the roof line. Concrete block for good measure :laugh:



I missed about with a few positions, forward, aft, up a little, down a little, and decided that I liked the 40mm vertical clearance, and decided on a figure of 250mm clear air between the back of the tailgate top, and the leading edge of the wing.

Again, the further back the better, but there comes a point where it looks like it's on a different car entirely if it gets too far away :laugh:

It was of course, at this point, time for our old friend - CAD



After the CAD, I busted out the Jigsaw, and made a pair of these from 6mm MDF:



and then it was time to offer it up, minus the timber and concrete block, to get a first impression of what this might actually look like.

Ladies and gentlemen, may I present, named by Leigh Lewis: #BigGayWingV2 :racer:











It's enormous, and utterly rediculous. I love it :laugh:

I think the shape and size suit the car a treat. It's clearly not subtle in any way, but who cares :laugh:

The turn buckle adjustment system also appears to have worked a treat too:



Hopefully I'll have some more templates cut out to test this evening. Perhaps try a few positions. Then, when I've finalised the position I'll be sending a template over to my friendly expert RobinJI to CAD it up and have it laser cut in ali :)
 
  • Like
Reactions: MICHAEL PARKER, StaceyS3, s3 Hoggy and 2 others
I have to say (and I am not usually a fan of wings etc) I actually quite like this. Think it is going to flow with the car shape pretty well and isn't going to look to ridiculous
 
Its quite small as far as BGW go!

I still think you should man up for a new MDF project....... Since you're the only person mad enough to try it, lol

619EFD88-66C0-4DA7-B487-868F3DE4666F_zpsiaky2qgj.jpg
 
I really want a diffuser Ant, but I want to do it properly, which means a bit more thinking.

Diffuser is something that'll happen as a winter project once I have a garage.

More wing progress today. Pretty happy with how it's coming along :)
 
  • Like
Reactions: g60leigh
You must log in or register to reply here.

Similar threads

J
A3/S3 Track car...
Replies
26
Views
8K
Prawn
Prawn
jsmotorsport
audi a3 8L track car
Replies
6
Views
4K
Prawn
Prawn
Marzo_NO
My A3 quattro track car
Replies
10
Views
4K
badger5
badger5
Sootpig
Sootpig's A3 track/drag car
Replies
166
Views
20K
Erikn89nl
Erikn89nl
M
S3 or A3 Track car?
Replies
40
Views
4K
Murf
M
Top
Back