BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      12-02-2018, 11:43 AM   #155
hunginator
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Quote:
Originally Posted by Happy Jose View Post
I've followed many threads on various brands like Porsche, Audi, MB, etc. It's a simple matter to check with the manufacturer about what their product fits. Oddly people don't want to do this and take advice from others who don't know either.

I've taken the time to investigate this matter. Here's part of Bilstein's response when I asked B6 or B8 on my 2010 SLK with Sport Pkg and 2012 BMW 135i with M-Sport Pkg:

"We would recommend using the B6 shocks for both cars. The B8 should only be used if the coil springs have been replaced with aftermarket lowering springs. The B6 shock is for the stock coil springs."

Further on in Bilsteins response, they gave the OEM part#s and the corresponding Bilstein part.

The shorter stroke of the B8 won't allow the stock spring to function correctly. Now if you install the BMW High Performance Springs, the B8 might be the correct part. To be sure, just run the part numbers past Bilstein. They can cross reference them.
Thanks for the reply! Just to double check, the OEM part # that you quoted was the M-sport springs, not the stock springs or the BMW Perf springs?
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      12-02-2018, 11:54 AM   #156
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Quote:
Originally Posted by hunginator View Post
Thanks for the reply! Just to double check, the OEM part # that you quoted was the M-sport springs, not the stock springs or the BMW Perf springs?
As duder13 said, the M Sport springs are the stock springs on the 135i.
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      12-02-2018, 01:51 PM   #157
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Quote:
Originally Posted by Happy Jose View Post
I don't think that is correct. I've examined Ones w/o the M-Sport Pkg which has the M-Sport suspension. It had a larger fender gap than my car.
Part of the problem is that Bilstein hasn’t been consistent in their recommendations. As I mentioned, all 135is have the M-Sport suspension, and Bilstein used to recommend B6, then they started recommending B8, and now they’re apparently recommending B6 again. See here: https://www.1addicts.com/forums/show...0&postcount=15

My guess is that the stock M-Sport suspension ride height is a bit of an “in-between” for Bilstein’s shocks, so their answers aren’t consistent, but who knows??

Last edited by duder13; 12-02-2018 at 01:57 PM..
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      12-02-2018, 02:37 PM   #158
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Quote:
Originally Posted by duder13 View Post
Part of the problem is that Bilstein hasn’t been consistent in their recommendations. As I mentioned, all 135is have the M-Sport suspension, and Bilstein used to recommend B6, then they started recommending B8, and now they’re apparently recommending B6 again. See here: https://www.1addicts.com/forums/show...0&postcount=15

My guess is that the stock M-Sport suspension ride height is a bit of an “in-between” for Bilstein’s shocks, so their answers aren’t consistent, but who knows??
That likely correct. Keep in mind there are 3 or 4 different spring rates within all of BMW's springs. (Example D2, D3, D4 & D5 for fronts.) The goal is to get ride height and handling correct based on the car's weight. But this can't be exact as there are so many variables in weight but only a few different spring rates. Example - I put springs from a highly optioned AT 135i on my non-sport 128i a couple of years ago and got very little drop. I now have BMWP springs on my car which I think was a hare's breath from calling for the next step in spring rates. So I believe I'm at somewhat the low end of ride height for my car with Perf springs.
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      12-02-2018, 03:00 PM   #159
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Quote:
Originally Posted by duder13 View Post
The 135i is only available with the M-Sport suspension, at least here in the US.
Quote:
Originally Posted by duder13 View Post
Yep, all 135i vehicles came with the M-Sport suspension standard. The vehicles you measured must have either settled or had suspension upgrades.

p.s. The stock M-Sport suspension did change from progressive to linear springs in 2011, and I’m not aware of any ride height differences, although I guess it’s possible.
Yep, that is correct(!) for the US market 135i.

Now for US market 128i's... there were two suspensions available(like in the ROW) markets.





Quote:
Originally Posted by Happy Jose View Post
I don't think that is correct. I've examined Ones w/o the M-Sport Pkg which has the M-Sport suspension. It had a larger fender gap than my car.
Nope, only one suspension for the US market 135i's

My US spec 135i sits a lot lower than most 135i's. I think the springs have sagged bc of all the high speed driving I have done on the Autobahns.

In Europe, BMW makes you pay for every little option. Yes, even a sports suspension on a "sporty" 300 Hp coupe! What was it that Jeremy Clarkson once said... that the German's don't make any money selling cars... they make their money on the OPTIONS!

When I install my Bilstein B12 kit(w/Eibach's) I will be sure to measure the before and after wheel gaps.

Dackel





My US spec 135i )all pics)with the stock suspension...
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      12-03-2018, 08:27 PM   #160
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is the front drop minimal i have hr sport springs i dont use anymore brcause of the drop roads in ny are terrible and i want something stiffer that has barely any drop
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      12-15-2018, 06:09 PM   #161
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Quote:
Originally Posted by dsocold View Post
is the front drop minimal i have hr sport springs i dont use anymore brcause of the drop roads in ny are terrible and i want something stiffer that has barely any drop
You could add some camber plates(like from Dinan) or have a machine shop make some spacers that add ~10mm on top of the front struts. For the rears they also make some rubber pads that can raise the car ever so slightly. Or just order new rubber pads... that aren't squished down from wear and tear.

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      12-18-2018, 06:53 AM   #162
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Unhappy You are asking for the impossible!

Quote:
Originally Posted by dsocold View Post
is the front drop minimal i have hr sport springs i dont use anymore brcause of the drop roads in ny are terrible and i want something stiffer that has barely any drop

Unfortunately, German manufacturers seems to equate a "sporty" ride with a stiff ride.

The normal way to lower a car is use a spring with a shorter height. The reduced suspension travel is compensated by using a stiffer or higher rate spring. Of course, this give a "hard" or uncomfortable ride.

If you have rough roads with a lot of pot holes, you want a suspension with a lot of travel to soak up the bumps. That requires a taller spring, compared to the sport spring, with a lots of movement or lower rate. And you need a shock or strut with bound/rebound to match the rate of the spring.

Unfortunately, there are a bunch of knotheads who think dropping a car looks cool with no interest how the suspension functions. Also a hard riding suspension is hard or the car wearing out suspension bushings and creating a lot of rattles.

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      12-18-2018, 08:29 AM   #163
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Quote:
Originally Posted by Happy Jose View Post
Unfortunately, there are a bunch of knotheads who think dropping a car looks cool with no interest how the suspension functions. Also a hard riding suspension is hard or the car wearing out suspension bushings and creating a lot of rattles.

You're not wrong here. There's an article linked at the top of one of these sub-forums where TC Kline talks about suspension setups for the 128i. Here is an excerpt:

Quote:
“If there’s any message I’d like to get out there, it’s that the best suspension is not the one with the most spring rate, but the one with the best shock damping that’s designed to work with the chassis and has as little spring rate as you can put in that gives you the best handling,” he says. “That’s the optimum setup for any race car, even an F1 car.”

Even in high-level racing, Kline says, a lot of teams set their cars up far too stiffly for optimum handling. “If they can’t get the power down coming out of a turn, they’re usually too stiff.”

The problem, he says, often stems from driver assumptions about setup.

“If they feel any roll in the car, they automatically think they need it stiffer,” Kline explains, “but that’s not necessarily the right answer.”
The thing is that a lowered car looks more sporty (to a point). Most people dropping their cars are not doing so to shave a second off their lap times.
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      12-20-2018, 08:15 AM   #164
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And going in reverse..

I'm raising my SLK 0.5" just to improve or soften the ride plus gain some additional ground clearance. We could call it Bilstein Porn!
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