I have indeed tried a CG lock - in fact, one is currently fitted to my car...
Trouble is, I have been little spoilt using race seats in my my track car and nothing comes close for that extra 'feel' of the car underneath you. I've got a pair of Recaro SPG seats in stock so just hunting down a good retrimmer to get them looking factory before exploring installation options. I'm even toying with the idea of heating pads to keep the seats heated...
As for the brakes - let me try and sum up how good they are. Pedal feel is the same as factory - i.e. can be a bit mushy at the top of the pedal, but firms up nicely as the pedal travel increases. This should be the case as I have increased piston area at both the front and the rear of the car, so the mastercylinder sizing should be correct if AP have done their sums.
After 12 hard laps of Donington, there was no fade whatsoever or change in pedal feel. They did however start to grumble a bit which I would put down to heat build up - I will look at some cooling ducts as I am sure this will help and is a problem on Z4s regardless of braking system used.
Always pays to be smooth in a Z4 because of the 'auto-prime' system - lift off the accelerator too quickly and the brake system primes itself so when you stand on the pedal (as it thinks you need an emergency stop), all the braking happens pretty much instantly!! Quite a shock when it happens, but easily managed just by being smoother with your inputs.
Bottom line? An expensive mod for sure but you always feel like there's braking capacity to spare which increases my confidence no end. With all the chassis mods done, I am delighted with the result!
. Is the deal you had still on? Could you point me towards it (PM is fine)?
