Z4 recall and traction control

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John Stolz - 31 Mar 2005 10:32 GMT

My (3 year old 2.8) Z4 was recalled recently for what the dealership
called a 'petite modification' (I live in France) I had new rear tyres
fitted at the same time.

I now find that the traction control seems excessivly aggressive. The
TC light is flashing often, even on only moderatly swiftly taken bends
with little or no throttle. I can feel the front brakes grabbing
on-and-off. This seems to be the case with TCS on and in DTC mode as
well (perhaps a little less severe in the latter case). if I turn the TCS
off then swift bends are taken more smoothly (no sense of the front brakes
grabbing on-and-off.

Anybody know what this recall modification might have changed?

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C.R. Krieger - 31 Mar 2005 18:46 GMT

> My (3 year old 2.8) Z4 was recalled recently for what the dealership
> called a 'petite modification' (I live in France) I had new rear tyres
[quoted text clipped - 9 lines]
>
> Anybody know what this recall modification might have changed?

No, but they didn't disable the *switch*, did they? USE IT!
--
C.R. Krieger
(Been there; done that)

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fbloogyudsr - 31 Mar 2005 20:50 GMT

"John Stolz" <china-rider@wanadoo.fr> wrote

> My (3 year old 2.8) Z4 was recalled recently for what the dealership
> called a 'petite modification' (I live in France) I had new rear tyres
[quoted text clipped - 4 lines]
> with little or no throttle. I can feel the front brakes grabbing
> on-and-off.

I wonder if the new rear tires, in conjunction with the old fronts,
has caused the system to think that there is a disparity between
the front and rear axle/tire speeds. There have been "stories"
about DSC/ABS and the fact that you should always have exactly
the same size tires on all 4 wheels.

Not saying that that's the problem, but it's something to check.

Floyd

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John Stolz - 07 Apr 2005 08:05 GMT

> "John Stolz" <china-rider@wanadoo.fr> wrote
>> My (3 year old 2.8) Z4 was recalled recently for what the dealership
[quoted text clipped - 15 lines]
>
> Floyd

Thanks, thats a very sensible suggestion (unlikemany ;-), and very likely
the reason. But....

1. I didn't notice the effect when the rears were well-worn - is there a
reason why smaller diameter rears wouldn't fool the traction control
system in this way.

2. This makes me a little worried about the cost of a destructive
puncture in one tyre of a part worn set - should the whole set be
replaced? Ouch!

Anyway thanks for a sensible suggestion, I'll have to get on with wearing
down those rears!

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Scott Robins - 01 Apr 2005 14:32 GMT

> My (3 year old 2.8) Z4 was recalled recently for what the dealership
> called a 'petite modification' (I live in France) I had new rear
> tyres fitted at the same time.
> Anybody know what this recall modification might have changed?

Surely the dealer knows what the modification is; since it's YOUR car maybe
THEY will tell you what they did.

ScottR

Signature

Scott Robins
97 e36

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Alan - 04 Apr 2005 18:07 GMT

Did they make 2.8 Z4s? You can't get them in the UK.

It could be that:

1.    The tyres are new and not yet at their best (have you done many miles
since?
2.    The dodgy French mechanics have set the tyre pressures wrong.
3.    As you suspect, the latest software is a bit "nannying"
4.    You say "little or no throttle" - lifting off suddenly will cause
the TC to intervene.

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Tom Korth - 04 Apr 2005 22:58 GMT

>> My (3 year old 2.8) Z4 was recalled recently for what the dealership
>> called a 'petite modification' (I live in France) I had new rear tyres
[quoted text clipped - 13 lines]
>
> Did they make 2.8 Z4s? You can't get them in the UK.

If 3 years old, it is a Z3, not a Z4. And if it is a 2002 model, it could
be a 2.5 or 3.0, but not a 2.8.

Tom

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