E46 M3 Track car mega build & development

[alclark]

It probably isn't ideal to run 4 degrees, but to clear the arches with the current wheel setup I do have to, plus it's the original camber numbers Schirmer put on the car, and the turn in was awesome.

But however you look at it, it does work pretty well for my limited skills and budget! And hey, still lots of development to do!

http://www.youtube.com/watch?v=z5Y2_nkAKyo

http://www.youtube.com/watch?v=Nk1uC5ujex4

[DazBlackCSL]

Build looks lovely mate and a lot fun effort and enjoyment in the process .. Which is the whole reason we do it to play :thumbs:

[shimmy]

I've yet to experience Cups (whilst driving), so I can only comment on things I have real world experience of .

Obviously you don't corner as hard as Al :gayfight: (and neither do I, as I only run mine at 3° on the front and 2¾° on the rear of my Escort :whistle:.).

I've had two sets of V70 - better Han ToyoR888 on 1400kg cars but nowhere near the dry grip of Cups.

[_Nathan_]

I've yet to experience Cups (whilst driving), so I can only comment on things I have real world experience of .

Obviously you don't corner as hard as Al :gayfight: (and neither do I, as I only run mine at 3° on the front and 2¾° on the rear of my Escort :whistle:.).

I run a 250 wide front on a 10" wheel, not got set up sheet here but somewhere between 4 and 4.5 degrees from memory, genuinely surprised that you'd need 4 degrees on a road tyre, which are all shit anyway :gayfight:

[Mike R]

I've yet to experience Cups (whilst driving), so I can only comment on things I have real world experience of .

Obviously you don't corner as hard as Al :gayfight: (and neither do I, as I only run mine at 3° on the front and 2¾° on the rear of my Escort :whistle:.).

[shimmy]

V70s aren't normal road tyres, they are Khumo's equivalent to Cups (and they're the absolute dog's danglies). Terrible in the wet, but amazing in the dry (as well as being available in different compounds). Shame they don't do 19s .

Cups do 19s, why would you want V70?

cups max recommended camber is -3.5 deg, no road tyres are built for big neg camber.

Pyro tests I've done on my CSL showed what optimum camber was effective on my CSL at Snett.

[shimmy]

Plan is to develop a CSL aero package and normal M3 separate. Large potential in aero gains on both cars but we want to do it without a big rear wing but with extension of the boot lid somehow. This cant be the most efficient for drag but will give better lift properties.

Working on a way of getting my CSL in the tunnel for a quick test...

Surely a wing in direct line of the airflow would give best downforce/extra area?

We all know the impact a well applied wing can have on somewhere like CRANERS but I'm not sure you'd ever get the same benefit form a boot spoiler, no matter how big it was........but can't wait to see the end effect

[Mike R]

4 degrees is a lot for road tyres?

Editted to say love this build though.

V70s aren't normal road tyres, they are Khumo's equivalent to Cups (and they're the absolute dog's danglies). Terrible in the wet, but amazing in the dry (as well as being available in different compounds). Shame they don't do 19s .

[_Nathan_]

4 degrees is a lot for road tyres?

Editted to say love this build though.

[alclark]

BTW, what front camber are you running ?
It seems massive :-D


EDIT : also, have you weighted the front carbon wings ?

Around 4 degrees at the front - the carbon wings weighed around a kilo and a bit each if I recall, less than a third of the weight of the steel wings.

[alclark]

Absolutely badass :drool: , and absolutely hideous at the same time. :notworthy:

Silly as it sounds, I'd like to keep it looking like a road car that goes well on the track, rather than a racing car that will never race.

'Tis amazing though - bet it runs well.

[Neil M]

Time to call it quits?:

[Rutkowski]

Fair enough guys.

Here is the wind tunnel for the CSL @ 200km/h



It's not bad, but it cannot be compared to the values cars like the 997 GT3 RS produce, that have these racing spoilers.

i really thought, CSL would create better downforce.... @ 250km/h + the lift would be even worse, much worse.

[Pooky]

also to bare in mind is for the Ring the cars have to remain TUF ( i thinki thats what its called) and with big wings you get puuled and thrown off. Happened to SamT last year.

I persoanlly would love to take the CSL aero a step further. I bought my spare front and rear bumper for just that purpose. Im sure a good aero package would add to grip levels.

Plan is to develop a CSL aero package and normal M3 separate. Large potential in aero gains on both cars but we want to do it without a big rear wing but with extension of the boot lid somehow. This cant be the most efficient for drag but will give better lift properties.

Working on a way of getting my CSL in the tunnel for a quick test...

[alexk]

BTW, what front camber are you running ?
It seems massive :-D


EDIT : also, have you weighted the front carbon wings ?