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Ive been having a bit of trouble with my ABS since swapping to an R33 diff and making up a mount for the 32 ABS sensor.

I was working fine before the swap but now i find the brake pedal is unusually firm and really standing on it will give concerningly low stopping power. Then after about 5 minutes the ABS light comes on, stopping power returns to normal, just there is no ABS.

This only happens at motorway speeds, at 50k's everything works as it should

There is just under 1mm gap form the sensor tip to the ABS ring

I must be missing something

Help anyone??

post-85702-0-16231100-1369485361_thumb.jpgpost-85702-0-58005700-1369485517_thumb.jpg

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  • 2 weeks later...

I'm not sure about this at all - but are the number of teeth on the R33 diff different to the R32's ? That would cause the computer to think the rear wheels were turning at a speed than the front wheels

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Or even a different material could cause it too (ie capacitive vs hall effect sensor) Just spit balling, but if the R32 ones were alloy and the R33 teeth were steel, then that would be an issue, you would have to change the sensors over too. (doubt they would be compatible though)

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Thats a point, but i used the driveshaft flange off the old R32 diff so same ring.

It uses the original sensor aswell, so the only change i can see is position of the sensor/distance from ABS ring.

R33 abs diffs are completely different as they have sensors either side of the diff on the output shafts.

Edited by zac the muss
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Diff ratio change might actually be the problem.........front ABS rings are still going around at the same speed they used to.....but now the rear one is going around slower. That might be enough to freak the ABS computer right out.

You might have to look into putting an R33 ABS system into it!!! eeek.

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Why? If you know you're going to have wheel lock, then you are prepared to modulate the pedal, no? ABS is intended for those crash stop moments on the road with drivers who don't know what they're doing at the best of times, let alone when they are surprised. If you're driving a car on the race track, you are at the opposite end of the spectrum from where ABS is intended to be used.

Edited by GTSBoy
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