@osiris Morning bud, maybe you can help me here. My rh front shock is finished? Its an electronic shock with EDC module. Bmwsa don't have and will have to order. Almost R20k for the part alone. Would fitting performance Bilstein's in the front both sides work, and in your experience and opinion will one be able to program the error codes out?
so I will be honest with you, I hate the stock suspension of the E89. I had the sports suspension that would become stiffer in sports mode like what you have and couldn't stand how floaty the car felt on the stock shocks so I switched over to ISC Coilovers, The E89 was very tricky to get the coilovers dialed in but what I ended up doing to finally get it feeling great was removing the rear coilover spring and replacing them with the stock rear springs mixed with the coilover shock.
The front are perfect. It's just the fact that you are literally almost sitting on the rear wheels in the E89 so the rear was very stiff and would bounce on uneven road surface making it very dangerous at high speed! With the combo I have it feels incredible. The car is way more accurate when turning, it's very direct and it holds corners much better.
I also fixed the E89's disgusting stance where the front sits higher than the back. It looks appaling! I gave the car a bit of a rake, so lower in the front, the ride height is now very similar to the E89 Z4 35is which is I think 15mm lower than the 35i. It's not stupidly low that I have to go sideways over speed bumps and because the coilovers are much less bouncy than the stock suspension so it actually handles speed bumps allot better, I no longer need to crawl over them to try protect the front of the car from smashing down and that is with a front lip fitted.
Mo at ISC will sort you out. shout if you want his details.
Your other option is to go find a second hand front shock from MD house and then get some Lowering springs, I forget the brand but there is a specific brand that suits the Z4 very well. I didn't go that route as I wanted some adjustability in the ride height, generally lowering springs sit to low for my liking, I don't like it when cars sit too low, it just makes it irritating to drive, I initially set my coilovers too low and I hated it lol.
