Re: KD's or more MXX3's help me decide...

["Ron Buchalski" <rbuchals@xxxxxxxxxxx>]

Aaron, a correction...

>
>Date: Sun, 8 Aug 1999 00:24:57 -0500
>From: "coolguy" <bike0001@domain.elided>
>Subject: Re: KD's or more MXX3's help me decide...
>
>just a point to consider/look further into:
>
>i'm not too sure on this, but i've heard reports that on the '95 M3's that
>the traction control system is sensitive enough to be confused by the
>different front/rear wheel diameters (ie. 225/45 17 fr and 245/40 17 r).
>that the 96 -> cars don't (cause their stock tires are different front/back
>diameters).
>
>Aaron Young
>


The '95 M3 did not have traction control available as an option.


The 'problem' that you are referring has been seen with 96+ M3s, which came 
with different tire/wheel sizes front/rear (225/45 R17 on 7.5" rims in 
front, 245/40 R17 on 8.5" rims in back).  There was no problem with the 
original tires, as supplied by the manufacturer.

However, since tires from other manufacturers (in the sizes listed) can 
actually vary in diameter from the dimensions of the Michelins, replacing 
the Michelin MXX3 with another brand of tire, or changing to a different 
tire size, can cause the rotational speeds of the front and rear tires to 
vary from what the ASC computer considers 'normal', and the computer will 
believe that wheel spin is beginning to occur, and activate ASC.  The people 
who have encountered this have said that it happens above 80 mph.

Cheap fix: turn off ASC at those speeds.
Boring fix: stay with the original brand and size of tire.


- -rb
'95 M3 (without ASC.  Lots of power.  Wheelspin?  :-D )
'93 525iT (without ASC.  Wheelspin?  In a STATION WAGON???)
'85 318i (without much power.  What's wheelspin?  :-(  )


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