Twitchy rear end...

[syyzed]

Hi Guys,

So as of late, my zed’s handling hasn’t been inspiring the most amount of confidence, the car is feeling twitchy, finding every pothole or divot in the road and tram-lining at every given opportunity :thumbsdown:

I was just wondering if this a common trait with the dreaded run flats currently fitted to my car or if maybe a simple tyre pressure adjustment would help settle it a bit? (currently running the recommended 33 front, 40 rear, which seems a little high for uk roads imo)

 

[buzyg]

Apparently they all d it. Ditch the run flats and enjoy .

Oh and less of those strong curries might help too. :wink:

 

[syyzed]

Apparently they all d it. Ditch the run flats and enjoy .

Oh and less of those strong curries might help too. :wink:

Haha, ill steer clear of those curry's for now, Saturday nights will never be the same though..

Its weird, I have only just started noticing it and i have had the car over a year now . I will be ditching them as soon as I can for pilot sports but for now, I was just wondering if maybe a simple tyre change and some alignment might make things a bit more bearable you know

 

[Busterboo]

I was just wondering if maybe a simple tyre change and some alignment might make things a bit more bearable you know

It will and not just "a bit more bearable", but very good.

Runflats on Z4s are the Devil's work.

 

[R60BBA]

40 rear is too high.

Too high a tyre pressure = darty/twitchy handling.

Drop the pressure down to 36 on the rears.

 

[Rathean]

I was just wondering if maybe a simple tyre change and some alignment might make things a bit more bearable you know

It will and not just "a bit more bearable", but very good.

Runflats on Z4s are the Devil's work.

Yeah this. I had Runflats on for a couple of years, kicking myself for not swapping out to Pilot Sports earlier but the difference, well, it's like driving a different car with much improved handling and ride quality

 

[Phoenixboy]

40 rear is too high.

Too high a tyre pressure = darty/twitchy handling.

Drop the pressure down to 36 on the rears.

So what pressures are you suggesting on run flats then?

 

[Busterboo]

40 rear is too high.

Too high a tyre pressure = darty/twitchy handling.

Drop the pressure down to 36 on the rears.

On your 2002 BMW 3 SERIES M3, perhaps, but not necessarily on a Z4.

 

[Player 1]

40 rear is too high.

Too high a tyre pressure = darty/twitchy handling.

Drop the pressure down to 36 on the rears.

On your 2002 BMW 3 SERIES M3, perhaps, but not necessarily on a Z4.

Exactly, BMW aren't stupid. If the recommended pressure was really as bad as the OP's describing, it wouldn't be the recommended pressure in the first place.

Sounds a lot like the alignment's taken a wander.

 

[MrPT]

Changing tyre pressures is free and easy. Try it.

 

[Silverzedtom]

I’d check your shock absorbers and springs too.

 

[syyzed]

40 rear is too high.

Too high a tyre pressure = darty/twitchy handling.

Drop the pressure down to 36 on the rears.

On your 2002 BMW 3 SERIES M3, perhaps, but not necessarily on a Z4.

Exactly, BMW aren't stupid. If the recommended pressure was really as bad as the OP's describing, it wouldn't be the recommended pressure in the first place.

Sounds a lot like the alignment's taken a wander.

Thanks, guys, ill try dropping the rear pressures now and ill let you know if that helps. I'm hoping its not anything more serious than that but we all know how these things go..

 

[Busterboo]

syyzed, you ain't going to get a decent ride 'til you dump the runflats.

 

[AveZ4coop]

syyzed, you ain't going to get a decent ride 'til you dump the runflats.

 

[Hellequin]

syyzed, you ain't going to get a decent ride 'til you dump the runflats.

and they are quieter!

 

[Hellequin]

I had my wheel alignment done recently and the improvement is excellent

 

[R60BBA]

40 rear is too high.

Too high a tyre pressure = darty/twitchy handling.

Drop the pressure down to 36 on the rears.

On your 2002 BMW 3 SERIES M3, perhaps, but not necessarily on a Z4.

Mate I ran 33/36 on my 2007 Z4 Coupe 3.0si with no issues.

I run 34 all round on my M3 (due to having CSL wheels with CSL spec Michelin’s).

 

[Busterboo]

Mate I ran 33/36 on my 2007 Z4 Coupe 3.0si with no issues.

And on an E89?

 

[Andyturbo2000]

I’ve noticed this recently. I think it’s the greasy roads as we transition from summer to wonder

 

[road warrior]

i dont notice a twitchy back end due to my very twitchy front end.. vile runflats - i have dropped my all round pressure to 30 psi to help compensate for the solid sidewalls and the stupid massive road calmers in burton - staffordshire county council want stuffing for the millions of cameras and road humps..