ABS and ABD on my RS
Discussion
The D is "differential"
What this means is that your diff acts as a limited slip when you're on the power to the effect of about 25%, whereas when you are on the overrun the diff gets much tighter, something like 60% lock up i believe, to reduce the tendency of our beloved rear engined cars to swap ends.
Basically ABD tries to eliminate lift off oversteer.
Here ends todays sermon.
Rev. VS
What this means is that your diff acts as a limited slip when you're on the power to the effect of about 25%, whereas when you are on the overrun the diff gets much tighter, something like 60% lock up i believe, to reduce the tendency of our beloved rear engined cars to swap ends.
Basically ABD tries to eliminate lift off oversteer.
Here ends todays sermon.
Rev. VS
Automatic brake differential (ABD) is completely different to the limited slip differntial fitted (LSD).
This is an extract from the handbook & RS supplement.
The ABD is a traction aid which reduces the tendency of a driven wheel to spin on one side of the car at speeds up to 44mph (70kmh).ABD is deacyivated at speeds of more than 44mph.
Within the speed range up to 44mph, the rotating speeds of the individual wheels are compared with each othe. If a specific difference in rotating speed is reached, brake pressure is applied to to the wheel ahich has started spinning until it starts turning at the right speed again. When ABD intervenes this is shown by the green instrument lamp in the instrument cluster.
It also temporarily de activates itself if the brakes get too hot.
This is an extract from the handbook & RS supplement.
The ABD is a traction aid which reduces the tendency of a driven wheel to spin on one side of the car at speeds up to 44mph (70kmh).ABD is deacyivated at speeds of more than 44mph.
Within the speed range up to 44mph, the rotating speeds of the individual wheels are compared with each othe. If a specific difference in rotating speed is reached, brake pressure is applied to to the wheel ahich has started spinning until it starts turning at the right speed again. When ABD intervenes this is shown by the green instrument lamp in the instrument cluster.
It also temporarily de activates itself if the brakes get too hot.
ABD acts as launch control, I have experienced it many times in my RSR whilst doing a standing start of a sprint event.
In operation ABD feels like axle tramp, shaking the whole rear subframe as the brakes pulse on and off controlling the wheel spin. Interestingly with the ABD working I got consistent start times of around 2.2-2.3 seconds for the first 64ft of a timed run, whereas now I have more power & Motec without launch control, the times vary between 2.25 & 2.45 seconds.
In operation ABD feels like axle tramp, shaking the whole rear subframe as the brakes pulse on and off controlling the wheel spin. Interestingly with the ABD working I got consistent start times of around 2.2-2.3 seconds for the first 64ft of a timed run, whereas now I have more power & Motec without launch control, the times vary between 2.25 & 2.45 seconds.
ninemeister said:
ABD acts as launch control, I have experienced it many times in my RSR whilst doing a standing start of a sprint event.
In operation ABD feels like axle tramp, shaking the whole rear subframe as the brakes pulse on and off controlling the wheel spin. Interestingly with the ABD working I got consistent start times of around 2.2-2.3 seconds for the first 64ft of a timed run, whereas now I have more power & Motec without launch control, the times vary between 2.25 & 2.45 seconds.
Interesting 9M...do you have GT2 subframe mounts on your car? Does this provide better location and less shake or is there little point in doing this mod? tks
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