Don't run the rears with the Alcons - much more balanced that way.
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Originally posted by lawsy View Post
This is incorrect if you do the math.
The Alcon is the only aftermarket brake kit out there that I know of that more or less retains the CSL brake bias out of the box. I did the math and it adds up.
See below.
Standard setup with an equivalent brake pad compound as the front Alcons. I am running pagid rs29 on the front alcons and performance friction pfc01 and the brake balance is "perfect" (quote from a veteran champion professional racing driver and acredited bmw driver training instructor who took my car for a test run around a new track yesterday and provided me with some setup feedback)Originally posted by toofastforyou View Post
If you want me to get really technical I can ... but as a reference.
The stock E46 M3 has a front to rear brake bias ratio of 1.98 (i.e. front heavy)
The standard CSL has a front to rear brake bias ratio of 1.73 (i.e. shifted slightly to the rear compared to the stock M3)
The standard Alcon kit in both front and rear configuration has a front to rear brake bias ratio of 1.78 (i.e very close to the stock CSL setup)
Running just the front Alcon kit and retaining the stock CSL rear setup gives a front to rear brake bias ratio of 1.82 (so in between the stock M3 and CSL setup - which I've found to be much much better).
As for those going with the AP racing kit - those kit are actually WAY MORE rear biased compared to all the other kits out there. For e.g. the 5570 kit has a front to rear brake bias ratio of 1.61 (very rearward biased).Comment
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Never! :hahaha: :hahaha: :hahaha:Originally posted by NZ_M3 View Post
Mr Gorilla will be along too if you start that :whistle:Comment
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All well and good Mr Tom but how does/should that relate to driving styles and performance. Why is one better than the other or are we just assuming BMW have it right and we should try to keep it biased as it was out of the box?Originally posted by NZ_M3 View Post
And if you have AP how will playing with pad compound front and back affect this rear bias (if at all)Comment
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Can you show your calculations please.Comment
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Interesting thread, think I'll wait for a conclusion before I waste any money like 'toofastforyou' did, seems he was toofastforhimself :hahaha:Comment
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Also - the suspension you have and it's effect on weight transfer under braking may change the optimum bias for your car...
Then you get in to other complexities like tyres and the weather, eg you move the bias rearwards when it is wet.
Basically on a car without bias adjustment is all you are looking for a compromise that suits you and your car's setup and driving style and maybe what is good for one isn't for another...Comment
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:whistle:Comment
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I will tomorrow, can't be bothered now ... it's nearly mid night here and I am watching a movie with the mrs :hahaha:Originally posted by _Nathan_ View Post
I used CoF at 0.36 and 750psi braking pressure for the calculations.
Actually you could go on and argue that you need different brake bias for different sort of corners (as they do in F1).Originally posted by _Nathan_ View Post
But you are right, without a bias adjuster you will not have optimal braking for every single corner around the track.
Brake feel however is completely subjective.
Shimmy, I don't have any reference as to what is considered optimal braking. I've simply stated what the 'stock' is set at by BMW. Interesting they shifted the bias rearwards though in the CSL compared to the standard M3. Must have been a reason for doing that.Comment
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I wonder if the weight saving on CSL mainly towards the rear meant they reduced rear bias?Comment
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Glad i bought the gayman now:hahaha:Comment
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