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Thread: Adjusting the brake bias on a MPS6?

  1. #1

    Default Adjusting the brake bias on a MPS6?

    Hey
    I'm installing 4-pot brembos on the front of my 6.

    From what I understand, our electronic brake bias controller is adjusted via the ecu. Is this system programmable through any means?
    Also, would it play havoc with the computer if I was to put a manual controller on the rear brake line?

    Cheers!

  2. Default

    Have you done the maths on how the 4 pot will change the bias, or is it just an assumption?

  3. #3

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    Purely an assumption at this stage.
    My plan at the moment is to smash them on, smash a new set of pads in the back, and see how long it takes to eat them.... lol

    Have you dealt with anyone through your store that's done a brake conversion to a 6?

  4. #4
    Join Date
    Dec 2010
    Location
    Sunshine Coast, QLD
    Posts
    458

    Default

    i dont think the last post helps at all.

    to anser the OPs question. you need to know the surface area of the current oem piston and a total surface area of the 4 pistons on the bembos. then do the mass and see if there is much difference.

  5. #5

    Default

    Plus take into account the frictional resistance of the pad and disc combinations you are using. Relative areas alone won't give you a useful figure (for example you could have massive pistons, lots of clamping force and huge swept areas but pour oil on them and they'd be useless). It's not an easy sum to get right. I'd go and talk to someone like Girlock or maybe even Brembo or other brake specialists for some insight into this. Girlock did a great job for me when I put more modern brakes and a new twin booster system on my Maserati.

    There is a chance you might be over-analysing it too.
    CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18

  6. #6

    Default

    Quote Originally Posted by shift View Post
    i thought the breaks on the 6 were good enough myself lol
    Can never have enough stopping power. And the fact that we have single pots on a 1.5+ tonne turbo car is pretty weak (although, M3's etc come with massive single pots, but even thats a step beyond ours).




    Quote Originally Posted by projectrracing View Post
    you need to know the surface area of the current oem piston and a total surface area of the 4 pistons on the bembos. then do the mass and see if there is much difference.
    This is what I was thinking - fill both calipers with fluid and measure the difference...


    Doing the sums is easy enough to figure out in tuning. What I need to know though, is how to actually modify the bias on the master cylinder... I'm half wondering if the ECU senses pressure figures and may compensate itself, or if I need to reprogram it... Or if all else fails, might need to use a manual bias controller (I've done this on r31's with 4-pot conversions)

  7. #7

    Default

    Keen to see how you go with the Brembos how are you going to go with clearance with rims and such? The brakes on the 6 are pretty good straight out of the box though, I thought one of the 6's party tricks was to out brake cars 2 to 3 times the price? I've fitted slotted rotors and Remsa pads to mine and the stopping power is epic... though 4 pot callipers do look the business though!

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