Handling on uneven roads (self steering)

Momo77

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Jul 29, 2017
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Location
Cambridge
Model of Z
Z3
I also put 32 front and 34 back. And result is still the same. So possibly tyres need changing
 

andyglym

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I also put 32 front and 34 back. And result is still the same. So possibly tyres need changing
I did the same mate and when I changed all 4 tyres the transformation was like driving a different car.
 

Bonzeau

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Location
Aylsham, Norfolk
Model of Z
Z3 2.8 litre Roadster
I dropped tyres pressure, still doing same thing but in a less aggrasive way (softer)
Do I cage all 4 tyres or just the front 2?
What Avons do you have fitted?
 

andyglym

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Rears - 255/35/Z18 AVON ZZ5 94Y XL
Fronts - 225/40/R18 AVON ZV7 92W

£390 inclusive of Valve/balance & laser wheel alignment &VAT.

Rears £85
Fronts £66.25
 

ZTec

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I did the same mate and when I changed all 4 tyres the transformation was like driving a different car.
Same here, went from 16" to 18" with 255/35/18 rear 225/40/18 front, total transformation.
 

Bonzeau

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Aylsham, Norfolk
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Z3 2.8 litre Roadster
Mine are Avon ZV5. These are no longer available ( though some may be left ). They have been replaced by the ZV7
 

Momo77

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Points
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Location
Cambridge
Model of Z
Z3
I have rear
1- AVON 245 40 ZR 17 91Y
2- ACCELERA 245/40 ZR 17 95W XL


Front:
1- AVON 225/45 ZR 17 91Y
2- UNIROYAL RAINSPORT2 225/45 ZR 17W
 

andyglym

Shiny Dust Caps Make Your Zed Go Faster.
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Location
Moresby, West Cumbria, England
Model of Z
2.8 Roadster
I have rear
1- AVON 245 40 ZR 17 91Y
2- ACCELERA 245/40 ZR 17 95W XL


Front:
1- AVON 225/45 ZR 17 91Y
2- UNIROYAL RAINSPORT2 225/45 ZR 17W
That's a mixture that I'm sure won't be helping I would've thought.
 

GazHyde

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Model of Z
Z4 MR
I have rear
1- AVON 245 40 ZR 17 91Y
2- ACCELERA 245/40 ZR 17 95W XL

Front:
1- AVON 225/45 ZR 17 91Y
2- UNIROYAL RAINSPORT2 225/45 ZR 17W
That's not a great combination, could well be contributing. Easy and cheap for us to tell you to change all 4, but I'd say that's where we are heading! As likely said before the Z3 is very unforgiving on tyres. Shame there isn't someone near you to do a wheel swap for a test drive to see any difference before committing!
 

ZTec

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That's not a great combination, could well be contributing. Easy and cheap for us to tell you to change all 4, but I'd say that's where we are heading! As likely said before the Z3 is very unforgiving on tyres. Shame there isn't someone near you to do a wheel swap for a test drive to see any difference before committing!
Wheel swap for a few hours is what I did with @miller1098. I wanted to move up from the original 16" wheels to 18", Hugh's wife Sarah has the MV1's that I was looking at with Pirreli P Zero Nero's all round on her 2.8, changed my car completely, once I got home I ordered four rims and tyres. The Zed shed changed the suspension, the shocks were shot completely, they were replaced with OEM items, springs replaced with Eibach sport 30mm lowered. The car is now sorted.
Ask the question, Is there anyone near you who is prepared to let you try out their wheels, nothing to loose, everything to gain. Good luck.
 
Last edited:

Momo77

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Points
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Location
Cambridge
Model of Z
Z3
I have just noticed that one of the rear shocks make squeaking noise when I push car up and down. Could that be a reason?
 

andyglym

Shiny Dust Caps Make Your Zed Go Faster.
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I have just noticed that one of the rear shocks make squeaking noise when I push car up and down. Could that be a reason?
Probably wouldn't help but more likely to be the tyres as the main culprits.
 

ZTec

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I have just noticed that one of the rear shocks make squeaking noise when I push car up and down. Could that be a reason?
Are they the original shocks.
 

ZTec

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It looks like it's sachs, not sure if it's original or or not though ... sorry
Looking at the corrosion in the pic, it could be the original shock, mine were originals (on the car since new) when I took them off and compressed them, they stayed there, didn't extend back out which will affect the way the car drives especially on rough and bumpy roads.
 

Mr Silver

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Dec 7, 2011
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Severe tramlining completely transformed by 17" Avon Z5's on front axle and Continental 6's on rear of my 3.0. Amazingly quiet as well is a bonus and, dare I say it, a noticeably more comfortable ride.



Regards
 

ZTec

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If your shocks are shot, it still wont feel right even if you have the best tyres and wheels fitted.
 

GazHyde

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It looks like it's sachs, not sure if it's original or or not though ... sorry
That is a factory fitted Sachs/Boge shock absorber.
 
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