Eibach Pro Kit installed in an E90 M3 with EDC

[Technic]

Originally Posted by aussiem3

Hi Technic
Did you install E36 bump stops with the Eibachs or was it the stock one?

OEM bump stops in this E90 M3 and now the same Eibach/OEM bump stops combo again in my E92 M3 with ZCP.

[aussiem3]

Thank you Technic for your prompt reply

[S65NAPWR]

Originally Posted by Technic

OEM bump stops in this E90 M3 and now the same Eibach/OEM bump stops combo again in my E92 M3 with ZCP.

How much lower were the Eibachs vs. your stock ZCP set-up? Do you have a comparison pict?

[Technic]

Originally Posted by S65NAPWR

How much lower were the Eibachs vs. your stock ZCP set-up? Do you have a comparison pict?

100% lower at the front (20mm vs 10mm ZCP) and about 50% lower at the rear (15mm vs 10mm ZCP)... no pics, sorry.

[S65NAPWR]

Originally Posted by Technic

100% lower at the front (20mm vs 10mm ZCP) and about 50% lower at the rear (15mm vs 10mm ZCP)... no pics, sorry.

Thanks. I was thinking H&Rs before but I know they bounce and don't ride properly vs. stock. How does the Eibach feel (new and now?) Seems like you've had it for a couple years now.

[Technic]

Originally Posted by S65NAPWR

Thanks. I was thinking H&Rs before but I know they bounce and don't ride properly vs. stock. How does the Eibach feel (new and now?) Seems like you've had it for a couple years now.

I've been using Eibach Pro Kits since 1990...

IMO, the Pro Kit version feel like OEM but lower; I think that it is their design purpose. If you want stiffer/lower then you may want the Racing Dynamics spring set.

[S65NAPWR]

Originally Posted by Technic

I've been using Eibach Pro Kits since 1990...

IMO, the Pro Kit version feel like OEM but lower; I think that it is their design purpose. If you want stiffer/lower then you may want the Racing Dynamics spring set.

I don't necessarily need stiffer, just a spring that would match perfectly with struts as-is. Have you tracked your car with the Eibachs? How does it respond?

[Technic]

Originally Posted by S65NAPWR

I don't necessarily need stiffer, just a spring that would match perfectly with struts as-is. Have you tracked your car with the Eibachs? How does it respond?

I did track my old E90 M3 twice on Eibachs and it was great for me, extremely planted and responsive. My limiting factor was the tires.

[S65NAPWR]

Originally Posted by Technic

I did track my old E90 M3 twice on Eibachs and it was great for me, extremely planted and responsive. My limiting factor was the tires.

I might try that and see how it works for me. I want present DD comfort and the ability to use it on the track like an OEM set-up.

Worst case I go back to OEM and sell the springs.

[ortho281]

+1 for Eibach Pro-kit springs. I went with the Eibach's over H&R because of the OEM ride quality. I installed springs over a year ago and have 11 track days so far. The ride quality is the same as OEM springs, with no bouncing or harshness as with some lowering springs. They do not lower as much as H&R, but then trade off is OEM ride quality.

[S65NAPWR]

Originally Posted by ortho281

+1 for Eibach Pro-kit springs. I went with the Eibach's over H&R because of the OEM ride quality. I installed springs over a year ago and have 11 track days so far. The ride quality is the same as OEM springs, with no bouncing or harshness as with some lowering springs. They do not lower as much as H&R, but then trade off is OEM ride quality.

Thanks for sharing your experience.

Question, doesn't the car slightly dive in the turns upon hard braking given that it rakes the car forward. My issue with springs as well is the fact they lower the car more in the front than rear to improve the look / fill in the gap. Sleeve Kits can prevent this from happening.

[ortho281]

Originally Posted by S65NAPWR

Thanks for sharing your experience.

Question, doesn't the car slightly dive in the turns upon hard braking given that it rakes the car forward. My issue with springs as well is the fact they lower the car more in the front than rear to improve the look / fill in the gap. Sleeve Kits can prevent this from happening.

No, the change in rake does not cause more dive because lowering springs also have increased spring rates. The car squats, lean and dives less due to the slight increase in spring rate. The amazing thing about the Eibach springs is that the ride quality remains the same, due to use of progressive springs and not increasing the rate so much that the ride becomes bouncy. Here is one of my vids from last HPDE. The EDC was set to normal mode and you will notice the car remains quite level cornering, even under hard braking.

[S65NAPWR]

Originally Posted by ortho281

No, the change in rake does not cause more dive because lowering springs also have increased spring rates. The car squats, lean and dives less due to the slight increase in spring rate. The amazing thing about the Eibach springs is that the ride quality remains the same, due to use of progressive springs and not increasing the rate so much that the ride becomes bouncy. Here is one of my vids from last HPDE. The EDC was set to normal mode and you will notice the car remains quite level cornering, even under hard braking.

Thanks for the explanation and video! Great driving.

[dead ringer]

Pic's are awesome, ordered the Prokit based on responses!

[edwinm3]

Originally Posted by dead ringer

Pic's are awesome, ordered the Prokit based on responses!

Enjoy, you'll love the eibachs