[c_w]

Contrary to what Eibach say, I would be inclined to trim the bump stops when fitting these springs. The car will be running close to them at the lowered ride height which means effective spring rate will ramp up significantly when it hits them, making the damper seem less effective.

For the M Performance Coilovers no bolts need replacing; leave all the top mount bolts in place and drop the damper itself by just undoing the centre nut (have a jack under the hub to lower it down. No messing with spring compressors either).

[jcarr343]

Originally Posted by Altra

This echos my previous experience with lowering springs on other vehicles, works great for the first few months, but I usually end up with coilovers anyway. Which was why I'm hesitant on lowering springs for this baby (m2).

I don't plan to track the car, but want a lower stance. Should I avoid the lowering spring route and just go straight to a coilover setup? I don't want to waste my time and money on something that may need to be replaced after a few months...

[jcarr343]

Originally Posted by jcarr343

I don't plan to track the car, but want a lower stance. Should I avoid the lowering spring route and just go straight to a coilover setup? I don't want to waste my time and money on something that may need to be replaced after a few months...

Should I be concerned with running through front struts when just doing lowering springs or the Dinan suspension? Feedback here would be helpful.

[JG_Coupe88]

After reading the entire thread, still to make up my mind. Hopefully more feedback rolls in from you guys with after more miles on them.

[omasou]

Originally Posted by JG_Coupe88

After reading the entire thread, still to make up my mind. Hopefully more feedback rolls in from you guys with after more miles on them.

If the goal is only looks or trying to save money. Do the HAS or springs. Installation cost and alignment should be a wash.

If you wanting to keep or improve the handling do the BMW M Performance coilovers. On my M2C it has made the ride more compliant--less jarring than my M2--and the car is dead flat on turns.

[JG_Coupe88]

Originally Posted by omasou

If the goal is only looks or trying to save money. Do the HAS or springs. Installation cost and alignment should be a wash.

If you wanting to keep or improve the handling do the BMW M Performance coilovers. On my M2C it has made the ride more compliant--less jarring than my M2--and the car is dead flat on turns.

Nah definitely not for just looks. I do have a dedicated track car that I take out every month , but the M2 will see track time a few times a year (I've had my M2 for 3 weeks lol), so whatever I go with, I was gonna do at the same time as the camber plates. Friend of mine ran springs + GC camber plates til he upgraded to JRZ and recommended springs + GC to me. Only reason I been looking into this.

If I don't do eibach springs , my top coilover considerations are KW V3(had on my last car) or M performance coilovers(which are developed by KW right?) . Thanks for the input, nice to hear the MP coils are a good candidate!

[swifty]

Originally Posted by c_w

Contrary to what Eibach say, I would be inclined to trim the bump stops when fitting these springs. The car will be running close to them at the lowered ride height which means effective spring rate will ramp up significantly when it hits them, making the damper seem less effective.

For the M Performance Coilovers no bolts need replacing; leave all the top mount bolts in place and drop the damper itself by just undoing the centre nut (have a jack under the hub to lower it down. No messing with spring compressors either).

Does anyone know which bump stops Dinan supplies with their HAS kit?

[TurtleS4]

If the drop is indeed perfect..... Maybe upgrade to Bilstein shocks w/ the Eibachs. Thats is my plan if I end up buying a higher milage car.

[cmb570]

how do Eibach's compare to H&R lowering springs ?

[akshon]

I run Eibachs with different bumpstops front and rear.
The fronts are about 1" shorter and the rear is about 0.5" shorter.
Car rides much much better with it. The front is what comes on the Dinan kit. The rears I figured our through trial and error. So good I had to share.

Front
Bmw f10 M5 Front Bump stop
31-33-7-847-472

Rear
Bmw e63 650CI Sport Rear Bump Stop
33-53-6-762-722

[6ixSpd]

Originally Posted by akshon

I run Eibachs with different bumpstops front and rear.
The fronts are about 1" shorter and the rear is about 0.5" shorter.
Car rides much much better with it. The front is what comes on the Dinan kit. The rears I figured our through trial and error. So good I had to share.

Front
Bmw f10 M5 Front Bump stop
31-33-7-847-472

Rear
Bmw e63 650CI Sport Rear Bump Stop
33-53-6-762-722

Perfect, this is exactly what I was looking for. Lowering a car on just springs almost always ends up riding on the bump stops, which leads to terrible ride quality over bumpy surfaces.

On the E9X M3, the Dinan "proprietary" ride handling kit sold with their lowering system simply used E36 M3 front bump stops, and 8mm shaved OEM front top hats with a nice mark up lol.

Glad to hear the bump stops are OE again and can be readily sourced!

[clemsonkev]

I'm going to order some of these springs for my 2017...... if I get 10mm spacers too, will I need new (longer) lugs? TIA

[juanky84]

Originally Posted by akshon

I run Eibachs with different bumpstops front and rear.
The fronts are about 1" shorter and the rear is about 0.5" shorter.
Car rides much much better with it. The front is what comes on the Dinan kit. The rears I figured our through trial and error. So good I had to share.

Front
Bmw f10 M5 Front Bump stop
31-33-7-847-472

Rear
Bmw e63 650CI Sport Rear Bump Stop
33-53-6-762-722

I will respectfully correct the information provided above
Sadly those part numbers are not what the M2 DINAN HAS kit uses. I will be installing the eibach Pro Kit with "DINAN" specified shorter bump stops on my M2C soon (when wife, kid, work and time allows ). If you download DINAN's installation instruction from their website you will find the Front bump stop part number right there (it is really a BMW OEM bump stop, just shorter). For the Rear bump stop the installation instruction doesn't gives the part number, but tells you the last 6 numbers of it so you don't get them mixed up. Long story short, I was able to get a picture of the rear bump stop and got the correct part number from there. Here they are, and hopefully it will benefit someone else.

Front: 33-53-6-784-122
Rear: 31-33-6-776-144

**Disclaimer: I know that eibach claims that shorter bumpstops are not needed for their kit but... Im just using available products to make my own setup and have fun

[imported_Riq]

Originally Posted by juanky84

I will respectfully correct the information provided above
Sadly those part numbers are not what the M2 DINAN HAS kit uses. I will be installing the eibach Pro Kit with "DINAN" specified shorter bump stops on my M2C soon (when wife, kid, work and time allows ). If you download DINAN's installation instruction from their website you will find the Front bump stop part number right there (it is really a BMW OEM bump stop, just shorter). For the Rear bump stop the installation instruction doesn't gives the part number, but tells you the last 6 numbers of it so you don't get them mixed up. Long story short, I was able to get a picture of the rear bump stop and got the correct part number from there. Here they are, and hopefully it will benefit someone else.

Front: 33-53-6-784-122
Rear: 31-33-6-776-144

**Disclaimer: I know that eibach claims that shorter bumpstops are not needed for their kit but... Im just using available products to make my own setup and have fun

Thank you.

I will follow the recommendation.

Maybe we could meet up some time.

Saludos

[juanky84]

Originally Posted by imported_Riq

Thank you.

I will follow the recommendation.

Maybe we could meet up some time.

Saludos

sure man! ping me on Inst > @naujotos

[JMM]

Originally Posted by Alby_416

so.. after a couple of weeks here's my final thought:

Don't get this or any other spring kit to go over the oem shock absorbers.

Went for a spirited mountain driving and the car is "jumping" over every road bump when turning uphill... the reduced travel of the shock absorber is causing this.

Same goes when on the highway, at high speed the car is really uncomfortable and jumps without any dampening.

In addition to all of this, when turning the wheel I can feel a squeaking noise coming from the front suspension. At first I thought it was the strut nut, but after re-torquing it nothing changed. I suspect is the bump stop which is touching somewhere due to the strut being more compressed than usual (this problem has been encountered between several other users).

The oem shocks are meant to be working at a very specific height and putting this (or other brand) springs just messes all up. It has been reported that the oem shocks start to leak after few months with lowering springs, not my case but I'm not willing to risk it.

Sure the car looks cool but if you're looking for a proper solution to live with a lowered car my suggestion is to go with a full coilover kit rather than only springs.

Going back to stock this week. Money wasted and lesson learned.

Old thread but I would like to say this anyway regarding the Eibach pro springs because I think some more info is needed before breaking them down.
I also have an Eibach pro kit since a few weeks on my M2 and I have no "jumpy" issues but I understand your problem.
Actually Eibach's engineers are the ones to blame imho opinion cos i can't understand that they seem to ignore the importance of bump stops.


I will try to explain: When the car is on its wheels, the stock gap between bump stop and front damper is about 15mm to 16mm and at the rear 20mm so if the suspension drops 25mm at the front you have the bump stops already pressed in by at least 10 mm and just not/well touching at the rear with a drop of 20mm...and that can never be good, if you think logically!

So what did I do...I shortened the bumpstops by 15mm at the front and 10mm at the rear (Both at the top NOT at the bottom!). That means I have now 5mm bump stop clearance at the front and 10mm at the rear. Less then stock but better a bit less then 10mm negative or zero clearance.
Result: It feels exactly the same as OEM, I really don't notice any difference, so definitely not bumpy or jumpy and maybe even a fraction less stiff then OEM but that can be subjective.


My personal conclusion: I really don't understand Eibach regarding this matter because a 10mm compressed bump stop at rest can never improve the suspension characteristics with the stock dampers... Yes, maybe there could be somewhat improvement at low speeds but that is only a part of the story, because at high speeds it's a totally different story, espacially on poor roads.

In any case my advice to all: Make sure the bump stops have somewhat travel freedom with this Eibach springs otherwise it could be go wrong in some drive situations, especially at high speeds or spirited driving on poorer roads...just my two cents....

[ddnmkun]

Originally Posted by JMM

So what did I do...I shortened the bumpstops by 15mm at the front and 10mm at the rear (Both at the top NOT at the bottom!). That means I have now 5mm bump stop clearance at the front and 10mm at the rear. Less then stock but better a bit less then 10mm negative or zero clearance.
Result: It feels exactly the same as OEM, I really don't notice any difference, so definitely not bumpy or jumpy and maybe even a fraction less stiff then OEM but that can be subjective.

Thanks for the input, was just researching how much I should be cutting.

[JMM]

I could have cut off a bit more but I guess this is the best compromise because it could be that your piston rod reaches the end of its travel on hard compression by shortening the bump stops too much, and you don't want that.

Yesterday I didn't pay attention and I hit a speed bump so hard that my both tyres hit the inner mudguards at the front top. I estimate it was a compression of easily 10cm when i later saw where the point of contact was.

I was pretty pissed off at myself but on the other hand, I am now pretty sure that the piston rod will not reach his end during hard compression.

[rjpiston]

I just installed the pro-kit last night and so far I'm really happy with the ride and am not experiencing any rubbing. The larger bumps in the road are a tad harsher, but overall the ride quality is similar to stock. However, I did notice that I get less wallowing in the rear(bounciness) on high speed corners, ie highway on ramp, with the new springs.

I originally bought the 6-series bump stops as someone recommended earlier in this thread, however, because I went with wider tires, I opted to not trim the stock stops or use the new shorter ones as I was afraid of rubbing.

The tire/wheel combo I'm running is:

Front: 19x9.5" ET28 with 265/30-19 tires
Rear: 19x10.5" ET45 with 295/30-19 tires

[M2_papi]

15k miles so far. Wish the rear sat a little lower but otherwise no complaints.

[DadVibes]

Reviving this thread to ask couple of questions about the Eibach Pro-Kit.

I just purchased a 2020 M2C, which previously belonged to another forum member. The car has Vorshlag camber plates and Swift springs installed. While it looks and handles amazingly well, it's a bit too slammed for me. Currently, there is absolutely no gap between tire and fender in front or rear. I measured the distance from the bottom of the wheel lip to bottom of fender edge and it's at 590mm (front) and 595mm (rear).

I'm looking to raise the car ~10mm, to roughly 600mm (front) and 605mm (rear). If my eyeballs don't deceive me, this should equate to ~1 finger gap in front and 1-2 finger gap in the rear.

From all the pictures I've sen, it appears that this is pretty much exactly what the Eibach Springs will provide.

Out of curiosity, does anyone know the measurement from the bottom of your 19" wheel lip to bottom of fender edge, front and rear? Also, would you say you have about a 1 finger gap front and maybe slightly more than 1 finger gap in rear?

[WOT Bimmer]

Originally Posted by rjpiston

I just installed the pro-kit last night and so far I'm really happy with the ride and am not experiencing any rubbing. The larger bumps in the road are a tad harsher, but overall the ride quality is similar to stock. However, I did notice that I get less wallowing in the rear(bounciness) on high speed corners, ie highway on ramp, with the new springs.

I originally bought the 6-series bump stops as someone recommended earlier in this thread, however, because I went with wider tires, I opted to not trim the stock stops or use the new shorter ones as I was afraid of rubbing.

The tire/wheel combo I'm running is:

Front: 19x9.5" ET28 with 265/30-19 tires
Rear: 19x10.5" ET45 with 295/30-19 tires

Thanks for sharing! I have the same tire setup, so that gives me some hope that rubbing would not be a problem. Do you have any spacers installed?