[Bee Pee]

Originally Posted by MyM235i

Part numbers? Drop over adaptive? Is it a kit with the bumpstops?
Cheers

Part numbers quoted on real oem are for shorter bumpstops only as you need to confirm Spring part number based on yr cars vin.

Drop is about 10mm all round and Spring rates up abt 20% front and 10% rear

[x233]

Originally Posted by Bee Pee

Spring rates up abt 20% front and 10% rear

If so, wouldn't that increase understeer?
Are you 100% sure this is accurate? Any reference?
Thanks.

[Bee Pee]

Not sure 3rd hand info so not gospel - best check direct with bmw to confirm

[hoppy6698]

Originally Posted by Bee Pee

Part numbers quoted on real oem are for shorter bumpstops only as you need to confirm Spring part number based on yr cars vin.

Drop is about 10mm all round and Spring rates up abt 20% front and 10% rear

Is this the kit for the 228? I thought the M235 comes stock with the 10mm drop over the 228i models due to the springs / bump stops.

[Bee Pee]

Originally Posted by hoppy6698

Is this the kit for the 228? I thought the M235 comes stock with the 10mm drop over the 228i models due to the springs / bump stops.

No Bmw do an MP upgrade for m235i adaptive

[MyM235i]

I contacted GetBMWparts for this. They had no data on the springs and suggested I check on the forums. I wonder who at BMW would know.

[Bee Pee]

http://www.bmw.de/de/topics/service-...lekatalog.html

Open up the link

U/name bmwetk1
P/word Eu111111

Find Spring part numbers for your cars configuration

[MyM235i]

Originally Posted by Bee Pee

http://www.bmw.de/de/topics/service-...lekatalog.html

Open up the link

U/name bmwetk1
P/word Eu111111

Find Spring part numbers for your cars configuration

That's very cool thanks!
So as near as I can tell there is no upgrade on springs. You simply configure to options on the car. Sunroof etc.

[Bee Pee]

You should see MP springs as option to be ticked so a spring numbers suit yr cars options.

[MyM235i]

Originally Posted by Bee Pee

You should see MP springs as option to be ticked so a spring numbers suit yr cars options.

So I gave that a go. Then looked up the part numbers generated with the following. 2016 M235i Xenon, electric seats, Pass through luggage and Mperformance.
Front 31 33 6 680 630
Rear 31 53 6 860 619
These come up as 435i springs. I wasn't able to generate any further data. I can see the 4 series springs having a firmer rate. I kinda doubt any drop.

[Dustin335i]

Originally Posted by x233

It seems H&R 25 mm lowering springs may be a bit of an overkill for the stock adaptive shocks. There might be better options out there, in terms of function and shock's longevity.

To name a few:
1. Dinan springs plus bumpstops that come with them.
2. Eibach Pro-Kit (15/20 mm front and 10 mm rear, cheaper and probably just as good if not better function-wise)
3. H&R 15 mm lowering version front and rear (as opposed to 25 mm lowering that most folks use)
4. Vogtland springs (15 mm lowering front and rear)
5. Lightweight Lower Spring Kit (15 mm version)
6. ...

At least, that's what I came across when searching for lowering springs for my car. There are some other options but they lower more than 15 mm so I didn't bother as I see no point in driving "on bumpstops".

I'd say "dinan" bumpstops are mandatory with all of the above (see OEM numbers above).

I've had Eibach springs for 6k miles and, knock on wood, the shocks are fine so far, though my roads are far from perfect.

Hey, thanks for sharing your experience; this post is VERY helpful. I have a RWD M235i, and like you, decided Eibach springs would be best for my daily driving needs. I see you are running the Dinan bumpstops with your Eibachs. Do you still feel they are the best bumpstops for Eibachs? I’m killing myself trying to decide if I should keep my oem bump stops or change them... I’m on a bit of a budget for this project (it’s christmas time), so if I go with the “Dinan” bumpstops, I’d rather find out which other oem bumpstops are similar, or identical, to the Dinan ones for $125. I just can’t spend $125 on bumpstops at the moment.

Thanks for your reply-

[Hasser]

yes very useful info.

I've just ordered the blistein b12 pro kit for my m235 red non adaptive.

this is the B8 dampers/shocks with the eibach springs.

so think it's worth getting the BMW OEM bump stops??

[x233]

Originally Posted by Dustin335i

Hey, thanks for sharing your experience; this post is VERY helpful. I have a RWD M235i, and like you, decided Eibach springs would be best for my daily driving needs. I see you are running the Dinan bumpstops with your Eibachs. Do you still feel they are the best bumpstops for Eibachs? I’m killing myself trying to decide if I should keep my oem bump stops or change them... I’m on a bit of a budget for this project (it’s christmas time), so if I go with the “Dinan” bumpstops, I’d rather find out which other oem bumpstops are similar, or identical, to the Dinan ones for $125. I just can’t spend $125 on bumpstops at the moment.

Thanks for your reply-

They are not Dinan bumpstops. They are OEM BMW ones that Dinan thinks work best with their product and sells them as their own. I use them and they are fine but I would prefer even shorter and softer ones for the front. That would be p/n 31332225377. I don't really experience problems with the "dinan" ones and they have improved things A LOT. Shorter and softer bumpstops are a must. Do not try using the stock F22 ones cause you'll bottom out frequently and ruin your wheels in no time. I occasionally, very rarely, would bottom out the front suspension even on those "dinan" ones. It only happened to me a few times in 2 years but I'd rather it didn't happen at all. That's why I think p/n 31332225377 would probably be better as they are slightly shorter. I bought them from BMW but haven't bothered to take apart the suspension again for that reason alone. If for some reason I have to take off the springs and shocks I'll make the swap then.

The "dinan" ones you can source from BMW or some other place for a fraction of their dinan price, the part numbers are:
31331138814 front
33536762722 rear

The ones I'd prefer for the front are 31332225377. I've never experienced any problems with the rear ones but some people use p/n 33531138109 (don't know if they're any different or better than the "dinan" ones).

[x233]

Originally Posted by Hasser

yes very useful info.

I've just ordered the blistein b12 pro kit for my m235 red non adaptive.

this is the B8 dampers/shocks with the eibach springs.

so think it's worth getting the BMW OEM bump stops??

No, you do not need bumpstops for the fronts at all because they are already included in the design of the front Bilstein B8 shock (inside its body so you can't see it). You'd need ones for the rears, though. Better get something shorter than the stock F22 ones (see the post above for the alternatives).

The B12 kit is fine. It really is a combo of B8 shocks and Eibach springs, perhaps they even provide bumpstops for the rear shocks.

I generally like B12 on other vehicles and used them several times in the past on other cars. They are fine in the summer but may be a problem in winter. I had them for about 2 days on my m235 xdrive but didn't like them compared to the stock adaptive shocks and the same Eibach springs.

Reason: I installed them in winter when there was a lot of snow, ice and bumps on the roads. B8 shocks have a rather stiff rebound setting from factory and a short travel (up to 5 cm shorter if I remember correctly). As a result the car felt quite jumpy and skipping a lot in those wintery conditions. You'd need perfect roads for them. Changed them back real quick for the adaptive shocks but kept the Eibach springs and like that combo a lot. Still use it.

I think Bilstein B6 shocks would work better in those conditions because they are essentially the same inverted monotube design and rebound settings as B8 but they are taller (this wouldn't effect the lowering because that is effected by the springs) and have significantly more shock travel (this would probably help in the conditions described above). But I didn't have a chance to try B6 shocks on my m235.

[Hasser]

Originally Posted by x233

No, you do not need bumpstops for the fronts at all because they are already included in the design of the front Bilstein B8 shock. You'd need ones for the rears, though. Better get something shorter than the stock F22 ones (see the post above for the alternatives).

The B12 kit is fine. It really is a combo of B8 shocks and Eibach springs, perhaps they even provide bumpstops for the rear shocks.

I generally like B12 on other vehicles and used them several times in the past on other cars. They are fine in the summer but may be a problem in winter. I had them for about 2 days on my m235 xdrive but didn't like them compared to the stock adaptive shocks and the same Eibach springs.

Reason: I installed them in winter when there was a lot of snow, ice and bumps on the roads. B8 shocks have a rather stiff rebound setting from factory and a short travel (up to 5 cm shorter if I remember correctly). As a result the car felt quite jumpy and skipping a lot in those wintery conditions. You'd need perfect roads for them. Changed them back real quick for the adaptive shocks but kept the Eibach springs and like that combo a lot. Still use it.

I think Bilstein B6 shocks would work better in those conditions because they are essentially the same inverted monotube design and rebound settings as B8 but they are taller (this wouldn't effect the lowering because that is effected by the springs) and have significantly more shock travel (this would probably help in the conditions described above). But I didn't have a chance to try B6 shocks on my m235.

thanks for the reply.
I'll wait and see what arrives in the kit before ordering the bump stops.

[XutvJet]

FYI - The "bump stops" are actually an integral part of the spring setup and specifically designed to work with the spring, in a sense creating a progressive spring rate as the spring reaches it's full compression stroke. They are not stops.