Racebred
Core Group Members
Re: Probably the 1st in the world
not necessarily, desmond. at track conditions, my AP 6 pot + semi slicks combi, effectively cancelled out ABS. If i brake hard, the wheels are actually allowed to lock up and i lose traction. Actually even with street tyres, there's enough braking force generated to overcome the ABS program too.
I actually subconsciously did treshold braking in sepang when the ABS disappeared. I didnt even notice my ABS was missing until Welbo did a taxi ride in my car and told me my ABS disappeared, and I had subconsciously adjusted my braking to suit.
In a subsequent experiment, by giving 100% braking, the wheels locked up and the car just glided forward. But back in a non-track condition, during wet braking on the street, the ABS returned.
So, my conclusion is, I dunno what the hell happened to the BMW ABS system, or how the parameters hold up inside, but if you mod your brakes, you better know how to drive around the changed conditions to suit. Never rely fully on the electronics.
On this note, i'd like to give some more advise on modding your car vs changed BMW electronic parameters. People who have modded their powertrain, or their ECU, should take note that the traction control programming involved in matching the ECU map to the autotrans are now no longer properly "speaking" to each other.
where originally, downshifts, and steering inputs involve some form of traction control, your car will be prevented from spinning off to death when you do a downshift in the middle of a corner. In modified cars, you run a very very (very) [very!!] freaken high risk of getting into a shift lock situation, where there now is a sudden torque change to your rear wheels while downshifting due to lack of traction control arising from anyone modding their cars.
If you are not prepared to do a full countersteer, you will spinout. This scenario can even happen on enthusiastic street driving situations where the kerb is just half a lane away. You have been warned.
I have had extensive experiences with the above 2 scenarios i listed, on the E46 chassis and electronics. Pls be careful when you mod or tinker with anything that's been properly designed out of the factory. Be a learned and informed modder, and safe driving to everyone.
not necessarily, desmond. at track conditions, my AP 6 pot + semi slicks combi, effectively cancelled out ABS. If i brake hard, the wheels are actually allowed to lock up and i lose traction. Actually even with street tyres, there's enough braking force generated to overcome the ABS program too.
I actually subconsciously did treshold braking in sepang when the ABS disappeared. I didnt even notice my ABS was missing until Welbo did a taxi ride in my car and told me my ABS disappeared, and I had subconsciously adjusted my braking to suit.
In a subsequent experiment, by giving 100% braking, the wheels locked up and the car just glided forward. But back in a non-track condition, during wet braking on the street, the ABS returned.
So, my conclusion is, I dunno what the hell happened to the BMW ABS system, or how the parameters hold up inside, but if you mod your brakes, you better know how to drive around the changed conditions to suit. Never rely fully on the electronics.
On this note, i'd like to give some more advise on modding your car vs changed BMW electronic parameters. People who have modded their powertrain, or their ECU, should take note that the traction control programming involved in matching the ECU map to the autotrans are now no longer properly "speaking" to each other.
where originally, downshifts, and steering inputs involve some form of traction control, your car will be prevented from spinning off to death when you do a downshift in the middle of a corner. In modified cars, you run a very very (very) [very!!] freaken high risk of getting into a shift lock situation, where there now is a sudden torque change to your rear wheels while downshifting due to lack of traction control arising from anyone modding their cars.
If you are not prepared to do a full countersteer, you will spinout. This scenario can even happen on enthusiastic street driving situations where the kerb is just half a lane away. You have been warned.
I have had extensive experiences with the above 2 scenarios i listed, on the E46 chassis and electronics. Pls be careful when you mod or tinker with anything that's been properly designed out of the factory. Be a learned and informed modder, and safe driving to everyone.
