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Handling Mods

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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Gingerlomax
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Post by Gingerlomax » Fri Dec 02, 2022 12:01 pm

Hi All. Apologies if this has been done a thousand times..
Had the Z 35i for a few months and starting to get a feel for it running the MHD 2+ MAP with all mods. When i got it the front felt lose especially under braking but that's been fixed with some new lower arms. Currently it has Koni Special Active Dampers, Quaife ATB rear differential already fitted and it handles OK but once you push it you can tell its a heavy thing. Without going down the M3 front end route what would you all suggest for handling mods. I was thinking upgrading antiroll bars, front strut & upgrading the bushes.. Then get it all aligned correctly. Anything else or things to avoid..
2010 Black E89 35i

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B21
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Post by B21 » Fri Dec 02, 2022 12:49 pm

Tyres, tracking, uprated front steering rods (meyle HD), either M3 front links or uprated bearings in the existing arms, uprated rear swing arm bushes, uprated ARBs all help..IMHO front strut waste of time..

Probably anything to improve front end streering feel..tracking has a big effect, but obviously that's the last point..toe in and camber close to factory spec..camber plates if you want more camber to help turn in..

See viewtopic.php?p=1969296&hilit=atacama#p1969296
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

Gingerlomax
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Post by Gingerlomax » Fri Dec 02, 2022 1:26 pm

Thanks for reply B21 :
With Bushes i thinking Powerflex and replace most suspension bushes
Eibach Anti Roll Bar ARB Kit (FRONT&REAR)
Then sort out tracking should make a big difference then?
2010 Black E89 35i

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Post by B21 » Fri Dec 02, 2022 2:40 pm

I’ve not personally used power flex bushes..I will try a set in the rear trailing arm when I fit the toe plates next year…

Most people use the M3 variants of the control arms and/or these bearings

https://www.bimmerworld.com/BimmerWorld ... 3-E82.html

Meyle HD have some good stuff, I used their steering track rod ends to good effect.

Primary issue is that the complex front linkages suffer from the strain of the weight and transfer so to start with they are not good and worsen with mileage.

The ARBs will help on the rear middle setting..

What tyres / sizes / wheels are you running?
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

Gingerlomax
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Post by Gingerlomax » Fri Feb 10, 2023 1:48 pm

What tyres / sizes / wheels are you running?

Sorry for delay in getting back.. its 225/40 18 on the front and 225/35 18 on the rear currently. Changing the fronts at the end of the month
2010 Black E89 35i

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Post by B21 » Fri Feb 10, 2023 2:23 pm

Gingerlomax wrote: Fri Feb 10, 2023 1:48 pm What tyres / sizes / wheels are you running?

Sorry for delay in getting back.. its 225/40 18 on the front and 225/35 18 on the rear currently. Changing the fronts at the end of the month
Strange combo I assume it’s a typo with 255/35 18 tyres on rear…

A set of GY Asy 6 would be a good move …maybe going to 235 on front and 265 on rear ..

Probably good to get fresh steering rack tie rod ends ..Meyle HD since you are doing the tracking..
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

Gingerlomax
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Post by Gingerlomax » Fri Feb 10, 2023 4:03 pm

Ye typo sorry 225/35 18
Does changing to 235 to 265 make much difference? The rears were new when i got it so loads left yet.
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Chippie
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Post by Chippie » Fri Feb 10, 2023 4:09 pm

Gingerlomax wrote: Fri Feb 10, 2023 4:03 pm Ye typo sorry 225/35 18
Shouldn’t that be 255/35 18?
E89 35is space grey Kansas coral red leather

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Post by Gingerlomax » Fri Feb 10, 2023 4:14 pm

Chippie wrote: Fri Feb 10, 2023 4:09 pm
Gingerlomax wrote: Fri Feb 10, 2023 4:03 pm Ye typo sorry 225/35 18
Shouldn’t that be 255/35 18?
Ye its been a really long day in work!! 255/35!!
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Post by B21 » Fri Feb 10, 2023 5:34 pm

What tyres are currently on it ?
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Post by Gingerlomax » Sun Feb 12, 2023 6:24 pm

Pilot sport on the rear. F1 asymmetric 3 on the front.
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Post by B21 » Sun Feb 12, 2023 6:33 pm

Gingerlomax wrote: Sun Feb 12, 2023 6:24 pm Pilot sport on the rear. F1 asymmetric 3 on the front.
A set of homogenous tyres would be a good start…
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Post by SV8Predator » Sun Feb 12, 2023 9:13 pm

B21 wrote: Sun Feb 12, 2023 6:33 pm A set of homogenous tyres would be a good start…
Hey! You're not allowed to say things like that these days! :driving:
2012 Z4 2.0 M-Sport Atacama Yellow
2000 Z3 3.0
2016 Vauxhall GTC Sunny Melon Yellow
2000 Jaguar X308 Sovereign 4.0
1969 Jensen Interceptor 6.3 litre

Gingerlomax
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Post by Gingerlomax » Tue Feb 14, 2023 10:25 am

B21 wrote: Sun Feb 12, 2023 6:33 pm
Gingerlomax wrote: Sun Feb 12, 2023 6:24 pm Pilot sport on the rear. F1 asymmetric 3 on the front.
A set of homogenous tyres would be a good start…
These were on when i got it.. Changing the fronts next weekend..
2010 Black E89 35i

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