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Discussion Starter #1
...is there any other tyre brand recommended for the Z3? I've been running continental sport contacts (summer) and conti winter contacts on my previous cars (an Audi a3 & an E91 3 series) with good results. I never had this tracking problem (car chasing the camber and irregularities of the road). Then again it might just be that the cars weren't prone to this. My Z3 is currently running Mythos tyres up front and Pirellis at the rear. Wheel geometry up front is within manufacturer's spec (recently adjusted) but rears slightly out of spec (and apparently NON adjustable). I'm hoping to fit a set of tyres that'll cure or at least *minimize the problem. Any suggestions?
 

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what suspension modifications (if any do you have) and when you say the rear is out of spec? - in what area (toe, camber etc)..
 

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vreddstein ultrac sessantas superb tyre and i am obsessed with handling so very picky. Toyo tir and falkens not in the same league.
 

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Discussion Starter #4
what suspension modifications (if any do you have) and when you say the rear is out of spec? - in what area (toe, camber etc)..
Thanks for the replies. To Pangster: as far as I know, the suspension set-up is stock. The gentleman at the dealership I used didn't give any details (though in retrospect I should've asked). He did say that in order to get it to match the manufacturers specs, I'd need to change out certain components in the rear suspension which he hinted would be an expensive job. When I asked which parts needed changing, he was clueless. I suppose I should've spoken to the chap who actually did the job. I'll give them a call to find out.
 

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Discussion Starter #5
Pangster, the garage confirmed that the rear camber is slightly off (a bit more negative camber than spec). And it's exacly the same on both sides. To fix it, the chap spoke of a trial and error system of changing components until they get it right. A potentially expensive exercise I suspect as after each part is changed, a geometry check is done (each check'll cost me about £160). I guess I'll try changing out the tyres before I start replacing expensive bits.
 

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vreddstein ultrac sessantas superb tyre and i am obsessed with handling so very picky. Toyo tir and falkens not in the same league.
Totally agree with this Vredestein Ultrac sessantas are fantastic, don't believe what you here about the Falkens they are cheap nasty budget tyres in comparison. The only tyre I've come across which is better than the Vredesteins are Goodyear F1 Asymmetric 2s, which are a fair bit more. I've got the Vredesteins on the back of my E92 335i and Goodyear F1 Asymmetrics 2s all round on my e85 Z4.
 

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Pangster, the garage confirmed that the rear camber is slightly off (a bit more negative camber than spec). And it's exacly the same on both sides. To fix it, the chap spoke of a trial and error system of changing components until they get it right. A potentially expensive exercise I suspect as after each part is changed, a geometry check is done (each check'll cost me about £160). I guess I'll try changing out the tyres before I start replacing expensive bits.
the camber is static in the rear of a Z3 - the only way you can change it is by lowering or raising the suspension (via coil springs/coil overs or aged/worn/saggy springs)... I wouldn't recommend letting anyone near my car who needs to do a trial an error on it to fix it!.. take it somewhere that can properly diagnose the problem and then fix it. FWIW most Z3's that are lowered have rear camber out of OE spec which has no adverse impact on handling.. you can buy weld in camber correction kits - but this is a serious amount of work and you probably wouldn't notice the difference in everyday driving..

I'd be inclined to take it to a local specialist.. although there are somethings that you can do that will improve handling.. a strut brace is probably one of the best pound for pound modifications you can to do a Z3 - the difference in handling is very noticeable and tram lining is reduced. you could also check over all of the suspension bushes (especially the front lollipop bushes) as these are prone to wear and relatively cheap to change as well..

HTH
 

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Discussion Starter #8
the camber is static in the rear of a Z3 - the only way you can change it is by lowering or raising the suspension (via coil springs/coil overs or aged/worn/saggy springs)... I wouldn't recommend letting anyone near my car who needs to do a trial an error on it to fix it!.. take it somewhere that can properly diagnose the problem and then fix it. FWIW most Z3's that are lowered have rear camber out of OE spec which has no adverse impact on handling.. you can buy weld in camber correction kits - but this is a serious amount of work and you probably wouldn't notice the difference in everyday driving..

I'd be inclined to take it to a local specialist.. although there are somethings that you can do that will improve handling.. a strut brace is probably one of the best pound for pound modifications you can to do a Z3 - the difference in handling is very noticeable and tram lining is reduced. you could also check over all of the suspension bushes (especially the front lollipop bushes) as these are prone to wear and relatively cheap to change as well..

HTH
Was a bit surprised myself with the trial and error suggestion. Especially as this was coming from the local BMW dealership. If you know of any specialist in the Aberdeen area, I'd be willing to try him. Re the strut brace, I've found a couple on eBay (Canada). Both are Cosmo racing struts. Heard of them?
 

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Discussion Starter #9
Eventually got myself a strut brace. It's amazing how much of a difference it makes. It still tram lines but only over the worst ruts. Im hoping that will be solved when I sort out the tyres. I've settled for Conti Sport Contact 3s all round. I used them on my E90 320d and previously on an Audi A3 and had no complaints with them.
 

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Eventually got myself a strut brace. It's amazing how much of a difference it makes. It still tram lines but only over the worst ruts. Im hoping that will be solved when I sort out the tyres. I've settled for Conti Sport Contact 3s all round. I used them on my E90 320d and previously on an Audi A3 and had no complaints with them.
I still don't know why they didn't come from the factory with one.. they went to the effort of bracing the front underside but not the two top turrets! LOL!.. I think £ for £ it's one of the best mods you can do to the car (as you've found out).. Good choice on tyres as well - although when I had my suspension sorted and set up properly - I had no issues with the FK452's that were no mine..
 

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I too agree with Pangster. Fitted Falkens to all 4 corners and it improved tram-lining - fitted a brace and now although it still tramlines a bit, not nearly as bad. The strut also helps with bump steer.

One cheap thing to double check is tyre pressures - I find that I can tell if the fronts are 1psi out from each other. A real pain is that my NSF wheel is loosing pressure (about 2psi per week). Probable rim-leak or its gone porous - must get it fixed....
 

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Discussion Starter #13
=One cheap thing to double check is tyre pressures - I find that I can tell if the fronts are 1psi out from each other. A real pain is that my NSF wheel is loosing pressure (about 2psi per week). Probable rim-leak or its gone porous - must get it fixed....
I've noticed the same weekly loss in tyre pressure. Rather odd. I'm hopping that once I swap the old Tyres out for the new Conti next week, that issue'll be solved.
 

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Totally agree with this Vredestein Ultrac sessantas are fantastic, don't believe what you here about the Falkens they are cheap nasty budget tyres in comparison.
a bit harsh old boy!!
I've had my Falkens for over a year now and pleased as punch with there performance thus far - at £120 a corner compared to £200 , i shall be sticking with them
 

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Discussion Starter #15
I've had the contis now for just over a week. Lots have been said about the Z3 sensitivity to tire pressure, tire wear etc. Unfortunately, it's all TRUE! It was like night and day swapping from the old tires to the contis. Perhaps someone more "mechanically minded" than I, might care to explain why. Just like Vitesse67, I've also noticed that the NSF tire keeps losing pressure (almost 0.5bars a week). This even after putting the new rubber on.

On week after fitting the new rubber, I had to pay a return trip to KwikFit (where the tires were fitted) to replace one of the alloys which was the wrong width (8j x 17" instead of 8.5J x 17"). Turned out that all 4 wheels had "lost" alignment! I'm wondering if this is one of the "characteristics" of Z3s? It's either that or there's something wrong with the wheels.
 

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a bit harsh old boy!!
I've had my Falkens for over a year now and pleased as punch with there performance thus far - at £120 a corner compared to £200 , i shall be sticking with them
I'll stick to what i've said, I've had Falkens, Continental SC3. Goodyear F1 Asymmetrics, Vredesteins and the original Bridgestone RFTs on a Z4.

With the Bridgestones I almost sold the car they were so bad, all the rest apart from the Falkens are pretty similar as in good performance wet or dry got about 24000 miles out of them. The Falkens initially just as good, after 5000 miles started to get noisy and tram line, with about 4 mm left on started to loose wet traction, at 12000 miles replaced, and they are normally more expensive than the Vredesteins!

If you look at the reviews on: Tyres by Brand | the online tyre guide you'll find that most peoples findings are in line with mine!
 
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