Best suspension for Daily Driver / Backroads Dancer 135i

[titium]

for those wondering final height with swift spec r springs and dinan camber plates is :

22.625" front
22.25" rear

measured from body to bottom of the rim
they've been on for a while now so should have completely settled.

[hokejka]

Originally Posted by titium

for those wondering final height with swift spec r springs and dinan camber plates is :

22.625" front
22.25" rear

measured from body to bottom of the rim
they've been on for a while now so should have completely settled.

YTM, can anyone do this with b12 pro kit please? (w dinan plates)

[titium]

Originally Posted by hokejka

YTM, can anyone do this with b12 pro kit please? (w dinan plates)

i think on the previous page in this thread it was posted that just the spec r's with no plates gives you 22.25" all round.

so i think it's safe to say the Dinan plates add around 0.37".

[hokejka]

Originally Posted by titium

i think on the previous page in this thread it was posted that just the spec r's with no plates gives you 22.25" all round.

so i think it's safe to say the Dinan plates add around 0.37".

supposedly a 1/4 but pro kit shoukd also be a 1/4 more srop in front. i know on paper its all calculable just asking for someone who actually runs it to let us know

[asbrr]

Originally Posted by hokejka

supposedly a 1/4 but pro kit shoukd also be a 1/4 more srop in front. i know on paper its all calculable just asking for someone who actually runs it to let us know

I will have this exact setup on the car in a few weeks once all the stuff comes in....although I have a 128i so may not quite be the same as for you guys with 135i's. I'll post results either way.

[Gangplank]

Leaning toward the BMWPS now. Have yet to read a bad review. Has anyone had it and then moved to B6/B8 or Koni Yellow?

Thinking

BMWPS
M3 control arms
Dinan plates

Already have Whiteline RSFB inserts.
Might add M3 front sway. Hmmm...

[tjswarbrick]

Doesn't the PS come with a Sway Bar that's half way between 135 and M3?

[Gangplank]

Originally Posted by tjswarbrick

Doesn't the PS come with a Sway Bar that's half way between 135 and M3?

It does and I was just looking up some info on that when I came across a few members running a square setup by using 4 rear rims. One member reported that adding the M3 front sway and a Eibach rear sway bar removes additional understeer. I'm not sure how much the rear bar adds to the equation but that was what was reported...

Rims, Tires and Spacers
4x 18x8.5 ET52
4x 245/35 R18 or 235/40
4x 10mm hub-centric spacers

Alignment
Front: -2.2° negative camber, 1/32" toe-in per side, 7° caster
Rear: -1.8° negative camber, 1/16" toe-in per side

[tjswarbrick]

I'd be reluctant to run that rear bar with out swapping out the e-Diff for an LSD.

[Gangplank]

Originally Posted by tjswarbrick

I'd be reluctant to run that rear bar with out swapping out the e-Diff for an LSD.

I'd add it when I get the LSD. Question is suspension or LSD first. Cost about the same give or take.

[tjswarbrick]

Originally Posted by Gangplank

I'd add it when I get the LSD. Question is suspension or LSD first. Cost about the same give or take.

Is that really the question?
Yes, top-notch suspension will probably make you long for the LSD.
But an LSD without an upgraded suspension probably won't do much for you at all.
Some guys with properly-tuned suspension track their cars al the time with the e-Diff. No-brainer for me. But then, I feel the suspension deficiencies all the time, and only rarely wish for better rear traction.

[titium]

has anyone run 245 up front on 8.5" rear rims with 10mm spacers? any issues? i imagine it would be a tight fit

[Zombie1]

Originally Posted by Gangplank

I'd add it when I get the LSD. Question is suspension or LSD first. Cost about the same give or take.

LSD is one of the biggest mods for these cars. I had all my suspension parts on the car before I added an M factory LSD plus a lockdown kit. The car is a million times better with the LSD then without it. Yes the suspension parts helped a lot when I did them but no matter how dialed in you make your car your leaving a lot of performance on the table with an open Diff.

[hokejka]

Originally Posted by Zombie1

LSD is one of the biggest mods for these cars. I had all my suspension parts on the car before I added an M factory LSD plus a lockdown kit. The car is a million times better with the LSD then without it. Yes the suspension parts helped a lot when I did them but no matter how dialed in you make your car your leaving a lot of performance on the table with an open Diff.

mfactory lsd and lockdown going in next weekend!

[hokejka]

Originally Posted by titium

has anyone run 245 up front on 8.5" rear rims with 10mm spacers? any issues? i imagine it would be a tight fit

yes many people, non issue. will prob need about 1.5-2 deg of camber

[tjswarbrick]

Originally Posted by hokejka

yes many people, non issue. will prob need about 1.5-2 deg of camber

Great. I thought I'd seen it done, but didn't have any specific instances to add.


Does anybody know front and rear spring lengths for the Swift Spec-R, BMW PS, and/or Eibach Pro-Kit for our cars?
Or even the factory M-Sport springs?
I can find reference to how much drop each offers, and see pictures in the Lowered Suspension thread, but if using the Dinan camber plates (raise the front) and installing on a convertible (drops the rear) and want to choose custom spring rates to use with Koni Yellows instead of going height-adjustable coilovers - want to make sure to select a well-balanced set of lengths.

[hokejka]

Originally Posted by tjswarbrick

Great. I thought I'd seen it done, but didn't have any specific instances to add.


Does anybody know front and rear spring lengths for the Swift Spec-R, BMW PS, and/or Eibach Pro-Kit for our cars?
Or even the factory M-Sport springs?
I can find reference to how much drop each offers, and see pictures in the Lowered Suspension thread, but if using the Dinan camber plates (raise the front) and installing on a convertible (drops the rear) and want to choose custom spring rates to use with Koni Yellows instead of going height-adjustable coilovers - want to make sure to select a well-balanced set of lengths.

Seriously? they have been covered 100x in the past couple pages.

[tjswarbrick]

Originally Posted by hokejka

Seriously? they have been covered 100x in the past couple pages.

Total drop is there for most of 'em. But that doesn't tell me actual spring length. I suppose if I find the length of the factory springs and do a little math I could figure it out. But that sounds like work.

Thanks for not letting the thread die!

[hokejka]

why does soring length matter? it goes on the same exact perch

[hokejka]

it only matters when you have coilovers that have a different spring dynamic. there your soring length effects perch placement

[tjswarbrick]

Originally Posted by hokejka

why does soring length matter? it goes on the same exact perch

If this is the case how can a set of PS springs reduce height by about 1/2 an inch while Cobb Springs bring it down 1.2"? They have fairly similar spring rates.

If ride height with Springs and shocks or struts is determined by outside factors, how could Lowering Springs even be a thing?

[asbrr]

Originally Posted by tjswarbrick

If this is the case how can a set of PS springs reduce height by about 1/2 an inch while Cobb Springs bring it down 1.2"? They have fairly similar spring rates.

If ride height with Springs and shocks or struts is determined by outside factors, how could Lowering Springs even be a thing?

Progressive springs complicate matters also....you could have springs that are the same length, and same overall "rate" but if one is progressive and the other is linear, you'd probably get different drops depending on how the low rate portion of the progressive spring is set up.

At the end of the day it's going to be very very difficult to get such an exact estimate of drop (you're talking accuracy of .25" or less), I think if that much difference is so important perhaps coilovers will give you that precise level of adjustment....

I've seen 2 identical cars have slightly different drops (0.25" variance for example) when using identical suspension kits! Don't know why, maybe it was an install issue, maybe it was shitty quality control on the suspension manufacturer's part...but I think it's going to be really hard to get such accurate measurements...