My Suspension quest! 130i

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Aug 13, 2019 7:06 am

Banjo wrote:
Fri Aug 09, 2019 7:59 pm

I’m pretty much copying your setup Ian, stock M-Sport springs, got some Koni sport adjustables, and will get the shorter bump stops as you’ve recommended, my car has only done 70,000kms and doesn’t even look like there’s any rear bump stops left, they seem to have perished.
Have found the Koni bump stops on Amazon and will order the front BMWP ones from somewhere, don’t wanna get something that isn’t the right thing, thanks again Ian, your a 130i suspension legend even on the other side of the world in NZ 🤙
Good choice its a nice setup and glad my testing has helped others :D
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Aug 13, 2019 7:08 am

///M wrote:
Tue Aug 13, 2019 5:21 am
Ian, out of interest, when you were experimenting with the BMW Performance springs is there any reason you opted for the:

31336788893 T3 Performance Front. Estimated rate = 160lb/in

33536788899 T2 Performance Rear. Estimated rate = 420lb/in

Instead of:

31336788892 T2 Performance Front
4.0 effective turns, 12.4mm wire. Estimated rate = 146lb/in

33536788898 T1 Performance Rear
Length = 310mm, 8.5 effective turns, 13.7mm wire. Estimated rate = 390lb/in
I wanted ( or thought I did) the stiffest setup, car handled amazing but a touch harsh for some of the bad roads around here, im tempted to try them again as car doesn't see as bad roads these days so maybe a future revisit :D
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

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///M
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Re: My Suspension quest! 130i

Post by ///M » Tue Aug 13, 2019 7:46 am

Should my springs prove to be sagging I may consider the T2 front/T1 rear setup as I think it’ll be a good compromise for DD duties. Out of interest, would I be correct in assuming that these springs won’t lower the vehicle anymore than oem m sport springs?

Looking forward to your updated impressions if you decide to switch things up a bit. This thread has so much win!

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Aug 13, 2019 8:30 am

///M wrote:
Tue Aug 13, 2019 7:46 am
Should my springs prove to be sagging I may consider the T2 front/T1 rear setup as I think it’ll be a good compromise for DD duties. Out of interest, would I be correct in assuming that these springs won’t lower the vehicle anymore than oem m sport springs?

Looking forward to your updated impressions if you decide to switch things up a bit. This thread has so much win!
Not sure on those springs but on the firmer ones I used it didn't affect ride height much, front was same rear dropped about 5mm from memory, what is your current measurement from wheel centre to arch lip ?
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

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///M
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Re: My Suspension quest! 130i

Post by ///M » Tue Aug 13, 2019 9:36 am

Approximately 339mm front/336mm rear. I may just start off with the Koni yellows and shorter bumpstops initially then consider the BMW performance springs if body control is of concern. I don't want things too stiff; though based on your experience the konis might be able to adequately damp the T2/T1 springs on the softer settings whilst allowing better body control? I don't want to mess around with sway bars too much as I want to maintain the maximum contact patch for our undulating NZ b roads...

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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Aug 13, 2019 10:44 am

///M wrote:
Tue Aug 13, 2019 9:36 am
Approximately 339mm front/336mm rear. I may just start off with the Koni yellows and shorter bumpstops initially then consider the BMW performance springs if body control is of concern. I don't want things too stiff; though based on your experience the konis might be able to adequately damp the T2/T1 springs on the softer settings whilst allowing better body control? I don't want to mess around with sway bars too much as I want to maintain the maximum contact patch for our undulating NZ b roads...
Looks like your a little low probably due slight spring sag and munched up bumpstops , stock msport cars are generally around 340/350mm front and similar at rear, often a bit uneven and lower on drivers (r/h) side as well.

Koni sports cope easily with the BMWP uprated spring rates, just you feel the smaller bumps a bit more and have to wind up damping a little more, its not terrible by any means but i wanted maximum comfort on bad road so went back to my Msport springs.

HTH
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

Banjo
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Re: My Suspension quest! 130i

Post by Banjo » Wed Aug 14, 2019 7:09 am

THETYRANT wrote:
Tue Aug 13, 2019 7:06 am
Banjo wrote:
Fri Aug 09, 2019 7:59 pm

I’m pretty much copying your setup Ian, stock M-Sport springs, got some Koni sport adjustables, and will get the shorter bump stops as you’ve recommended, my car has only done 70,000kms and doesn’t even look like there’s any rear bump stops left, they seem to have perished.
Have found the Koni bump stops on Amazon and will order the front BMWP ones from somewhere, don’t wanna get something that isn’t the right thing, thanks again Ian, your a 130i suspension legend even on the other side of the world in NZ 🤙
Good choice its a nice setup and glad my testing has helped others :D
Do you think it would be ok to use a KYB bump stop I found locally that is same shape and density and cut to Koni shorter ones length, or is it better to wait for the Koni ones from overseas

Image
Last edited by Banjo on Wed Aug 14, 2019 7:37 am, edited 1 time in total.

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Re: My Suspension quest! 130i

Post by THETYRANT » Wed Aug 14, 2019 8:20 am

That KYB one should be ok, do you have the dimensions ?
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

Banjo
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Re: My Suspension quest! 130i

Post by Banjo » Wed Aug 14, 2019 9:32 am

THETYRANT wrote:
Wed Aug 14, 2019 8:20 am
That KYB one should be ok, do you have the dimensions ?
Height of the Koni one is around 40mm I think, the width of the KYB one is around 53mm at the widest point and at the 38mm height point where I would cut will be in the dip where it is narrowest at 45mm wide, I have one already and fits snug on the shock, what do you think Ian?

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Re: My Suspension quest! 130i

Post by THETYRANT » Wed Aug 14, 2019 10:18 am

Sounds worth a go and if they have a dust cover as well to keep crap off the damper thats good, the Koni ones take the oem dust cover which is handy.
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

Banjo
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Re: My Suspension quest! 130i

Post by Banjo » Wed Aug 14, 2019 10:24 pm

THETYRANT wrote:
Wed Aug 14, 2019 10:18 am
Sounds worth a go and if they have a dust cover as well to keep crap off the damper thats good, the Koni ones take the oem dust cover which is handy.
Do you remember what the height of the Koni bump stops was Ian, thanks

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Re: My Suspension quest! 130i

Post by THETYRANT » Thu Aug 15, 2019 8:23 am

Banjo wrote:
Wed Aug 14, 2019 10:24 pm
THETYRANT wrote:
Wed Aug 14, 2019 10:18 am
Sounds worth a go and if they have a dust cover as well to keep crap off the damper thats good, the Koni ones take the oem dust cover which is handy.
Do you remember what the height of the Koni bump stops was Ian, thanks
I cant remember but its 40mm according Koni spec online for the 71.34.42.000.0 I use, I also trimmed another 5mm off the fat/non tapered end of it for for little extra travel but no real need.

Link to koni bumpstop specs - https://www.koni-na.com/en-US/NorthAmer ... eeves-(3)/

HTH
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

Banjo
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Re: My Suspension quest! 130i

Post by Banjo » Thu Aug 15, 2019 8:40 am

THETYRANT wrote:
Thu Aug 15, 2019 8:23 am
Banjo wrote:
Wed Aug 14, 2019 10:24 pm
THETYRANT wrote:
Wed Aug 14, 2019 10:18 am
Sounds worth a go and if they have a dust cover as well to keep crap off the damper thats good, the Koni ones take the oem dust cover which is handy.
Do you remember what the height of the Koni bump stops was Ian, thanks
I cant remember but its 40mm according Koni spec online for the 71.34.42.000.0 I use, I also trimmed another 5mm off the fat/non tapered end of it for for little extra travel but no real need.

Link to koni bumpstop specs - https://www.koni-na.com/en-US/NorthAmer ... eeves-(3)/

HTH
Great...thanks

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Thu Aug 15, 2019 9:25 am

No problem enjoy the setup once you get it on there :D
--
Now on my 3rd 130i, this time a nice E81 in Graphite, Previously 2 x 130i and 2 x 135i

Camber plate project - http://www.babybmw.net/viewtopic.php?f=20&t=96465

Suspension Quest thread - http://www.babybmw.net/viewtopic.php?f=20&t=80208

wrevilo23
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Re: My Suspension quest! 130i

Post by wrevilo23 » Thu Aug 15, 2019 10:18 am

This is a fascinating thread, thank you to everyone for their input. Especially THETYRANT!

I very recently changed car from a Renault Sport Megane 265 Cup on 47k miles to an E81 130i m Sport on 147k miles. The Renault was very, very firm and the BMW feels soft in comparison. After some time in the car I feel the BMW needs to be tauter and more resistant to roll (but not as much as the Renault!), whilst staying supple and hopefully avoiding the transmission of 'big hits' through the cabin that do happen on occasion at present. I think more sophisticated damping is necessary and potentially stiffer springs.

I'm having new rear discs and pads fitted on the weekend and will ask the garage to check the condition of the suspension components, as I feel that some are potentially tired and not at their best, although the rear shocks and springs were changed in April last year.

Whatever the outcome I'm considering a complete refresh of the suspension components. The Bilstein B12 Pro Kit looks like an attractive option in terms of price and no need for bumpstops. Given my background and wants do you think this might be a good option?

There has been a lot of discussion around Koni dampers, but has anyone tried these as part of the Koni STR.T or Sport suspension kits? The STR.T kit is very cheap and I'm not particularly interested in faffing about with settings. Feedback welcome!

Thanks :)
2008 E81 130i M Sport < 2012 Renault Sport Megane 265 Cup

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