My Suspension quest! 130i

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Dan258
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Re: My Suspension quest! 130i

Post by Dan258 » Tue Jun 12, 2018 2:46 pm

THETYRANT wrote:
Tue Jun 12, 2018 1:29 pm
Dan258 wrote:
Tue Jun 12, 2018 12:26 pm

Then it's a case of what springs/dampers... a fair few pages ago, I think Ian listed the Eibach pro spring lengths for the 135 e82, e88 and 130i (shortest to longest). Ideally, I'd like my car slightly lower so was thinking of getting hold of either the e82 or e88 springs but it doesn't sound like anyone's looked in to this? In terms of the front, it's likely I'll go with the Eibachs I've already got.
Haha yes it does go on abit so guess it can get confusing :oops:

My advice would be fit the Eibach pro springs you already have with new bumpstops on the original dampers if they are ok with no leaks, that said even if dampers look ok with 90k+ on they will be past there best so maybe change them at same time, its down to budget which to replace with, the Bilstein B4S for OE spec replacement and good prices, or if budget allows Koni Sport adjustables are best ive used for comfort (on softer setting) and handling (when firmed up a notch or 2)...and good balance as all rounder.

Makes sense to do dampers while doing springs/bumpstops etc especially on front as it all has to come apart might as well just do it once, rears are separate so can be done later but might as well do lot imo.

If you want lower rear (eibach pro doesn't really lower rear) then BMWP springs I used will drop it about 10mm, your sacrificing comfort though as less damper travel and they are firmer, makes it handle brilliant but little harsh for me so went back to msport springs which are goo allrounders biased towards comfort.

HTH

Ian
Cheers for the quick response. After posting the question, it dawned on me that it would probably be worth doing the bumpstops etc whilst actually changing the dampers as everything's off like you say.

I think it may be worth waiting a few months and doing the whole lot in one go and getting hold of some dampers.

I think I'd be happy to sacrifice a little comfort for handling, I've got a mate with an old s4, so need to be able to keep up with him haha in terms of the b4s dampers, did you do a track session with them? How did they perform? You've probably done a review of them already but there was so much to read and remember so forgive me!

I think bmwp rear springs sound like what I'm looking for. It's unlikely I'll have the car long enough to see the effects, but would you see increased wear from shorter springs on dampers designed for oe spec?

Cheers
Dan
BMW 130i e87 Black Sapphire 2008

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THETYRANT
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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Jun 12, 2018 5:19 pm

Dan258 wrote:
Tue Jun 12, 2018 2:46 pm

Cheers for the quick response. After posting the question, it dawned on me that it would probably be worth doing the bumpstops etc whilst actually changing the dampers as everything's off like you say.

I think it may be worth waiting a few months and doing the whole lot in one go and getting hold of some dampers.

I think I'd be happy to sacrifice a little comfort for handling, I've got a mate with an old s4, so need to be able to keep up with him haha in terms of the b4s dampers, did you do a track session with them? How did they perform? You've probably done a review of them already but there was so much to read and remember so forgive me!

I think bmwp rear springs sound like what I'm looking for. It's unlikely I'll have the car long enough to see the effects, but would you see increased wear from shorter springs on dampers designed for oe spec?

Cheers
Dan
No problems glad to help if i can :)

I didnt have the B4S on for long and didnt run them on track i dont think, however i have run many track laps on bone stock Msport suspension on previous 130's and its not bad for a standard setup so the B4S will be just as good if not better, Springs are the key for track as while stock is a decent enough allrounder but if you start to push on track then firming up the springs makes a big difference to way car turns in and rolls etc espeically if fitting shorter bumpstops (stock bumpstops contribute to overall spring rates so actually quite good on track) , the BMWP springs i fitted front and rear (see a couple of pages back) gave stock front ride height and approx 5-10mm lower at rear but with approx 30% uprated spring rates, if i was doing more track i would of left them on as handling was very good, but its a rare thing these days i get on track so went back to msport for better road manners.

Wear rates wont be a problem with mild drops.

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

Dan258
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Re: My Suspension quest! 130i

Post by Dan258 » Tue Jun 12, 2018 7:01 pm

THETYRANT wrote:
Tue Jun 12, 2018 5:19 pm

No problems glad to help if i can :)

I didnt have the B4S on for long and didnt run them on track i dont think, however i have run many track laps on bone stock Msport suspension on previous 130's and its not bad for a standard setup so the B4S will be just as good if not better, Springs are the key for track as while stock is a decent enough allrounder but if you start to push on track then firming up the springs makes a big difference to way car turns in and rolls etc espeically if fitting shorter bumpstops (stock bumpstops contribute to overall spring rates so actually quite good on track) , the BMWP springs i fitted front and rear (see a couple of pages back) gave stock front ride height and approx 5-10mm lower at rear but with approx 30% uprated spring rates, if i was doing more track i would of left them on as handling was very good, but its a rare thing these days i get on track so went back to msport for better road manners.

Wear rates wont be a problem with mild drops.

Ian
This is like speaking to a suspension encyclopaedia haha thanks for your help.

I don't want to hijack the thread and ask a million questions and be that annoying person but a couple of last things.
Do I remember somewhere in the thread that the bmwp have a higher spring rate than the Eibach pros? As I understand, this effectively means a stiffer spring and therefore would likely perform better on track assuming no other changes? Would it be a noticeable difference?

Second one, I don't think you looked in to the Eibach sportlines. I've done a bit of reading and they seem to be stiffer and lower than anything you've looked in to. Did you research them at all? Others have said on an m sport it lowers the front by around 35mm and the rear by around 15-20mm. You say that damper wear rates won't be a problem for mild drops but my guess would be that this is slightly too much. My thoughts are this would be slightly excessive and with wider tyres and m3 lcas and 12mm spacers, there's a chance of rubbing on arches and tbh, I cba to deal with that haha

Thanks again,
Dan
BMW 130i e87 Black Sapphire 2008

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Re: My Suspension quest! 130i

Post by THETYRANT » Tue Jun 12, 2018 7:34 pm

Dan258 wrote:
Tue Jun 12, 2018 7:01 pm

This is like speaking to a suspension encyclopaedia haha thanks for your help.

I don't want to hijack the thread and ask a million questions and be that annoying person but a couple of last things.
Do I remember somewhere in the thread that the bmwp have a higher spring rate than the Eibach pros? As I understand, this effectively means a stiffer spring and therefore would likely perform better on track assuming no other changes? Would it be a noticeable difference?

Second one, I don't think you looked in to the Eibach sportlines. I've done a bit of reading and they seem to be stiffer and lower than anything you've looked in to. Did you research them at all? Others have said on an m sport it lowers the front by around 35mm and the rear by around 15-20mm. You say that damper wear rates won't be a problem for mild drops but my guess would be that this is slightly too much. My thoughts are this would be slightly excessive and with wider tyres and m3 lcas and 12mm spacers, there's a chance of rubbing on arches and tbh, I cba to deal with that haha

Thanks again,
Dan
LOL no just someone who has spent way to much time and money swapping suspension about :lol:

There are lots of different BMWP springs but they ones I found were highest rate fro E8x platform which was about 10% stiffer than Eibach Pro from what I remember, also i didn't want to lower car as think stock is low enough so was good front didn't drop at all but rear did a tad, not huge amount though and acceptable, biggest issues with lowering is reduce suspension free travel (before bumpstop intervention) which affects comfort and also ground clearance problems on speedbumps and ramps etc.

I did look at the Eibach Sportline kit but its way to low to give a decent ride quality imo also ground clearance is greatly reduced, another issue i don't need. To me its the Chav spring kit for those wanting slammed look but too tight to buy proper suspension to do it.

Spacers and lowering along with M3 LCA is a whole other story, i found with 12mm spacers on front and M3 LCA i had some slight scrubbing inside the arch, all depends on quality of roads you travel on though i guess, fitting camber plates to tip wheel over more can help but lots of other factors like tyres etc to take into account.

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

Dan258
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Junior Member
Posts: 37
Joined: Thu Dec 22, 2016 2:01 pm
Location: Kent

Re: My Suspension quest! 130i

Post by Dan258 » Tue Jun 12, 2018 8:27 pm

THETYRANT wrote:
Tue Jun 12, 2018 7:34 pm

LOL no just someone who has spent way to much time and money swapping suspension about :lol:

There are lots of different BMWP springs but they ones I found were highest rate fro E8x platform which was about 10% stiffer than Eibach Pro from what I remember, also i didn't want to lower car as think stock is low enough so was good front didn't drop at all but rear did a tad, not huge amount though and acceptable, biggest issues with lowering is reduce suspension free travel (before bumpstop intervention) which affects comfort and also ground clearance problems on speedbumps and ramps etc.

I did look at the Eibach Sportline kit but its way to low to give a decent ride quality imo also ground clearance is greatly reduced, another issue i don't need. To me its the Chav spring kit for those wanting slammed look but too tight to buy proper suspension to do it.

Spacers and lowering along with M3 LCA is a whole other story, i found with 12mm spacers on front and M3 LCA i had some slight scrubbing inside the arch, all depends on quality of roads you travel on though i guess, fitting camber plates to tip wheel over more can help but lots of other factors like tyres etc to take into account.

Ian
Well I'm very grateful you've gone through all the time and effort and done the write up on it so thanks very much.

Sounds like I'll go for Eibach pro fronts and bmwp rear springs with b4s. Slightly lower with the comfort and performance balance I'm after I think.

I'll probably end up asking about how to deal with a rubbing issue eventually but for now I'll leave you to your evening!

Thanks again for your help. Genuinely great knowledge and advice.
BMW 130i e87 Black Sapphire 2008

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