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Re: Z4 recall and traction control
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CarGuru > BMW > Re: Z4 recall and traction control 7 April 2005 11:05:59

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Re: Z4 recall and traction control

Alan 4 April 2005 21:07:31
 John Stolz 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> 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?


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.
Add comment
Tom Korth 5 April 2005 01:58:31 permanent link ]
 
"Alan" <alan@no.net> wrote in message
news:d2rs8h$cp7$1@n­ews8.svr.pol.co.uk..­.> John Stolz 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>> 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?>
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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John Stolz 7 April 2005 11:05:59 permanent link ]
 On Thu, 31 Mar 2005 11:50:55 -0800, fbloogyudsr wrote:
"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>> 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. >
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
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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CarGuru > BMW > Re: Z4 recall and traction control 7 April 2005 11:05:59

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