A handling question…

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Yorkshire_lad

Member
Afternoon folks.

My 2015 Z4 (35is) really doesn’t like oddly cambered or lumpy/undulating road surfaces (I don’t mean “broken” and/or potholed surfaces). The handling seems to get very flustered on anything but nice smooth road surfaces, which are getting rarer and rarer in the UK! It’s led to a few “white knuckle” moments when I really didn’t feel like I was pushing hard at all.

I’ve had my local BMW garage check the suspension geometry and they say everything is as it should be so I don’t think there’s anything obviously wrong.

Assuming the suspension is basically correct I’m now thinking about tyres, shock absorbers and springs. They’re all standard (I think) and it’s just been serviced and MOT’d so I believe they’re all generally working as they should be. Tyres are Bridgestone Turanza T005 225/40R18 on the front and Bridgestone Potenza RE050A 255/35 R18 on the back, all run flats. It was previously on Potenzas all round and still had the same handling characteristics.

I’m wondering whether replacing the tyres with non-run flat might be one option, but it’s a fairly expensive option to do with no real idea of whether it will help 🤷🏼‍♂️. My other thought was to find a really good independent BMW garage with experience in setting up suspension and se what they say.

Has anyone had similar experiences or have any wisdom to share?
 
Having had GY tyres for 14 years on the car, quite like the Michelins i have now.
They feel softer and quieter than the GY Asym.
 
Also my car doesn't have the servotronic option, it was a optional extra.
Think became standard on lci cars and read the geometry was also tweaked.
 
Yorkshire_lad said:
Assuming the suspension is basically correct I’m now thinking about tyres, shock absorbers and springs. They’re all standard (I think) and it’s just been serviced and MOT’d so I believe they’re all generally working as they should be. Tyres are Bridgestone Turanza T005 225/40R18 on the front and Bridgestone Potenza RE050A 255/35 R18 on the back, all run flats. It was previously on Potenzas all round and still had the same handling characteristics.
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My 5 series felt horrible the other day.
I topped off the tyres to 2.4 bar front and 2.6 rear a couple of weeks ago.
Was driving a couple of days back, and the car felt awful, jittery, back end got away once. I thought it had a major issue.

It turned out to be the tyres on like 3.3 / 3.4 bar
Way over inflated. I know it was cold, much colder a couple of weeks ago, either that or the air compressor I used had a dodgy gauge.

You have likely checked, but it’s worth testing. It’s gotten much warmer.
 
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