Hi everyone,
My Hyundai Coupe is in need of a new rear hub and, to cut a long story short, my local garage (non-Hyundai) says he can get me an unbranded replacement hub (a sealed hub/beating unit with ABS ring attached) for half the price of the genuine Hyundai unit.
However, he has pointed out the the ABS ring, whilst being the same size as the genuine Hyundai unit, has fewer teeth on it. I'm not sure how many fewer - my current wheel has 44 teeth.
He is adament that he's fitted many to other Coupe's and can confirm that the ABS functions fine afterwards, and indeed does not trigger the self-test fault system. With regards to this latter point however I've examined the fault codes/diagnosis and have found that no such fault condition for mismatched tone wheels exists - the closet fault matches are for missing teeth detected by irregularities in the sine-wave.
So, my question is thus: Whilst it appears, based in his evidence, that this teeth discrepency does not pose a problem I have learnt from searching the web of cars where this has indeed posed a problem - usually in the form of the self-diagnosis failing.
My theoretical ABS knowledge, whilst limited, leads me to believe that a wheel having fewer teeth would give the impression of that wheel turning slower relative to the others on the car (assuming the state of rotational velocity for for all wheels being the same). It is this theory that worries me - could it lead to incorrect operation of the ABS... ...particularly when I need it most?
I would be grateful from feedback from anyone else that has, for whatever reason, experienced trouble from a mismatched tone wheel arrangement. Or indeed if anyone works directly with the design of ABS systems could comment that would be great. The manufacturer of my system is the Japanese company Mando - I've e-mailed them for comment and await a reply.
I'm well aware a topic like this could provoke all sorts of
*theoretical* predictions of how the system *could* behave and hence I would particularly appreciate input that could be backed up with experience/authority!Regards,
Mat