My Suspension quest! 130i

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Dec 11, 2018 8:03 am

Change the tyres asap before you do anything else :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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fmn716
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Re: My Suspension quest! 130i

Post by fmn716 » Wed Dec 19, 2018 7:40 am

Hi Ian,

What do you think of putting powerflex bushes on the top of the rear shocks

https://www.powerflex.co.uk/product-det ... /2010.html

Thanks George

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Wed Dec 19, 2018 9:33 am

fmn716 wrote:
Wed Dec 19, 2018 7:40 am
Hi Ian,

What do you think of putting powerflex bushes on the top of the rear shocks

https://www.powerflex.co.uk/product-det ... /2010.html

Thanks George
Never tried them i just fitted new oem bmw mounts to minimise NVH issues, im sure the powerflex will be firmer but unless running very stiff dampers i dont see the need and will just translate into more noise being transmitted into cabin area.
--
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

Mr Whippy
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Re: My Suspension quest! 130i

Post by Mr Whippy » Wed Dec 19, 2018 11:00 am

Very good/new OE is the only really fair starting point for mods imo.
There is a good chance on anything 10yr+ ish old, that it’s past it best.

In my experience powerflex etc are better than knackered OE, but anything is.
New OE is often surprisingly good, feeling soft but also sharp, rather than just soft like worn OE.

Probably worth trying to use BMW M parts where possible on the subframe as to me that’s the squishiest feeling bit on mine... but again it’s a 100k mile car so new OE might be a revelation!
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump

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

Post by ///M » Wed Apr 03, 2019 2:50 am

Thanks Ian for this amazing thread- I’ve learnt so much about the various 130i suspension set-ups. Prior to this I was very much considering the Birds setup; though I’ve been convinced the Koni yellows + shorter bumpstops are the way to go! What settings have you landed on (front and rear) for M sport springs as a good compromise for daily driver duties and b road blasts? 180 degrees from full soft front and rear? 90 degrees from full soft front and rear? Or a mixture? Thanks in advance

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Re: My Suspension quest! 130i

Post by THETYRANT » Wed Apr 03, 2019 7:30 am

///M wrote:
Wed Apr 03, 2019 2:50 am
Thanks Ian for this amazing thread- I’ve learnt so much about the various 130i suspension set-ups. Prior to this I was very much considering the Birds setup; though I’ve been convinced the Koni yellows + shorter bumpstops are the way to go! What settings have you landed on (front and rear) for M sport springs as a good compromise for daily driver duties and b road blasts? 180 degrees from full soft front and rear? 90 degrees from full soft front and rear? Or a mixture? Thanks in advance
No problem glad its been some help :) ive been playing around with Koni settings recently, initially I was on +90deg front and rear which makes a nice road setup, if really pushing on it could do with a touch more so ive been upto +360 on front which is awesome at speed, bit firm when pottering about our terrible roads so currently on +180 which is a good compromise, changing back to summer wheels with PS4 tyres last week from my winters made it feel a lot firmer so just getting used to that! Rears I haven't adjusted since fitting but might take them off soon and wind to +180 also.

Ian
--
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 » Wed Apr 03, 2019 7:30 am

///M wrote:
Wed Apr 03, 2019 2:50 am
Thanks Ian for this amazing thread- I’ve learnt so much about the various 130i suspension set-ups. Prior to this I was very much considering the Birds setup; though I’ve been convinced the Koni yellows + shorter bumpstops are the way to go! What settings have you landed on (front and rear) for M sport springs as a good compromise for daily driver duties and b road blasts? 180 degrees from full soft front and rear? 90 degrees from full soft front and rear? Or a mixture? Thanks in advance
No problem glad its been some help :) ive been playing around with Koni settings recently, initially I was on +90deg front and rear which makes a nice road setup, if really pushing on it could do with a touch more so ive been upto +360 on front which is awesome at speed, bit firm when pottering about our terrible roads so currently on +180 which is a good compromise, changing back to summer wheels with PS4 tyres last week from my winters made it feel a lot firmer so just getting used to that! Rears I haven't adjusted since fitting but might take them off soon and wind to +180 also.

Ian
--
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 » Wed Apr 03, 2019 8:13 pm

Thanks for that! I have the luxury of running summer tyres all year ‘round so the +90deg front and rear might work out better. I’d be interest to hear how you go with the rear adjustment and what you end up settling on with the PS4’s fitted. From past experiences with McPherson suspension set-ups, I’ve found that the front is more important that the rear (for roll control). Hence why I was thinking it may be worthwhile leaving the rears at +90deg (for comfort) and upping the fronts to +180deg for added control.

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Re: My Suspension quest! 130i

Post by Banjo » Tue Aug 06, 2019 8:30 am

Hey Ian, or anyone else who knows the answer to this. The BMWP front bump stops recommended here, part number 31331096099, does anyone know the height of these

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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Aug 06, 2019 8:47 am

Banjo wrote:
Tue Aug 06, 2019 8:30 am
Hey Ian, or anyone else who knows the answer to this. The BMWP front bump stops recommended here, part number 31331096099, does anyone know the height of these
Yes info is probably in here somewhere but I should have it somewhere on pc will have a look later.
--
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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Re: My Suspension quest! 130i

Post by Nyxeris » Thu Aug 08, 2019 10:43 pm

THETYRANT wrote:
Tue Aug 06, 2019 8:47 am
Banjo wrote:
Tue Aug 06, 2019 8:30 am
Hey Ian, or anyone else who knows the answer to this. The BMWP front bump stops recommended here, part number 31331096099, does anyone know the height of these
Yes info is probably in here somewhere but I should have it somewhere on pc will have a look later.
In case this was still needed... Had a pair lying around and your answer is 57mm.

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E81 130i | Build Thread

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Re: My Suspension quest! 130i

Post by Banjo » Fri Aug 09, 2019 8:20 am

Awesome, thanks mate, gonna try source some local in New Zealand, what’s the density of them, are they like hard foam...thanks again

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Re: My Suspension quest! 130i

Post by THETYRANT » Fri Aug 09, 2019 9:11 am

Banjo wrote:
Fri Aug 09, 2019 8:20 am
Awesome, thanks mate, gonna try source some local in New Zealand, what’s the density of them, are they like hard foam...thanks again
Just buy them from BMW as its such a critical part in how suspension works on these cars its not worth messing about to be honest, its a complex foam structure and plays a huge part in the overall spring rate & damping on these cars, if you used something made from different material it could cause all sorts of issues.
Somewhere in my quest i tried a very short cut down version on front and it just didnt feel right at all and i think OEM is best in this case, either stock Msport or the shorter ones if lowered, im on these shorter ones with stock msport springs to help a little with ride quality due to a little more free travel before it comes into play, but there is a sacrifice in reduced overall front spring rate due to less mass for it to squash but im happy with it like that, on rear its a very different story though and you can play around more with that to fine tune ride or stiffness etc and hugely improce the rear pogo issue stock setup has

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 » Fri Aug 09, 2019 7:59 pm

THETYRANT wrote:
Fri Aug 09, 2019 9:11 am
Banjo wrote:
Fri Aug 09, 2019 8:20 am
Awesome, thanks mate, gonna try source some local in New Zealand, what’s the density of them, are they like hard foam...thanks again
Just buy them from BMW as its such a critical part in how suspension works on these cars its not worth messing about to be honest, its a complex foam structure and plays a huge part in the overall spring rate & damping on these cars, if you used something made from different material it could cause all sorts of issues.
Somewhere in my quest i tried a very short cut down version on front and it just didnt feel right at all and i think OEM is best in this case, either stock Msport or the shorter ones if lowered, im on these shorter ones with stock msport springs to help a little with ride quality due to a little more free travel before it comes into play, but there is a sacrifice in reduced overall front spring rate due to less mass for it to squash but im happy with it like that, on rear its a very different story though and you can play around more with that to fine tune ride or stiffness etc and hugely improce the rear pogo issue stock setup has

HTH
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 🤙

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Re: My Suspension quest! 130i

Post by ///M » 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

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