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E89 + bilstein b12 kit. Rear bump stop??

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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stevespg
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E89 + bilstein b12 kit. Rear bump stop??

Post by stevespg » Sun Jul 31, 2022 9:15 pm

As above, fitting b12 bilstein kit to e89 35i, front shocks have internal bump stops, but I can’t get clarity on if the rears should use bump stop , and if so, a bilstein one or reuse original one.

Anyone done this and have clarity?

I’ve asked bilstein tech… still waiting a reply.

Thanks all
Z4 3.0si - gone
Z4MR - gone
E89 35i - gone

Kiwi_Mike
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E89 + bilstein b12 kit. Rear bump stop??

Post by Kiwi_Mike » Thu Aug 04, 2022 10:39 pm

Hi Steve, sorry I can't help as I know next to nothing about Suspension.

I would however be keen to hear how the B12's go on the 35i as I would like to upgrade my suspension. I'm guessing its a fairly straight forward job for an indy mechanic? Cheers.

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B21
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E89 + bilstein b12 kit. Rear bump stop??

Post by B21 » Thu Aug 04, 2022 11:01 pm

Normally on the rear you retain the OE parts unless it conflicts with the new parts..so OE bump stops should be retained…afaik…that’s what I did on the 20i with B8s…
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is :thumbsup:

stevespg
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E89 + bilstein b12 kit. Rear bump stop??

Post by stevespg » Thu Aug 04, 2022 11:10 pm

B21 wrote: Thu Aug 04, 2022 11:01 pm Normally on the rear you retain the OE parts unless it conflicts with the new parts..so OE bump stops should be retained…afaik…that’s what I did on the 20i with B8s…
Thanks. That’s what we’ve done, but couldn’t find much definitive to confirm…
Z4 3.0si - gone
Z4MR - gone
E89 35i - gone

stevespg
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E89 + bilstein b12 kit. Rear bump stop??

Post by stevespg » Thu Aug 04, 2022 11:11 pm

Kiwi_Mike wrote: Thu Aug 04, 2022 10:39 pm Hi Steve, sorry I can't help as I know next to nothing about Suspension.

I would however be keen to hear how the B12's go on the 35i as I would like to upgrade my suspension. I'm guessing its a fairly straight forward job for an indy mechanic? Cheers.
fitting was easy, will know this weekend what it feels like
Z4 3.0si - gone
Z4MR - gone
E89 35i - gone

Kiwi_Mike
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Joined: Fri May 28, 2021 10:34 am
Location: South Island, New Zealand

E89 + bilstein b12 kit. Rear bump stop??

Post by Kiwi_Mike » Wed Aug 17, 2022 2:24 am

stevespg wrote: Thu Aug 04, 2022 11:11 pm fitting was easy, will know this weekend what it feels like
What's the verdict Steve? A worthwhile upgrade?

What kind of money were the 4 shocks?

stevespg
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E89 + bilstein b12 kit. Rear bump stop??

Post by stevespg » Wed Aug 17, 2022 6:46 am

Yes.
Had concerns they’d be harsh , but no, ride remains compliant, definitely feel firmer damping, and less body roll . I fitted new front wishbones at same time, so with new shocks springs and rubber bushes in the wishbones, car felt more taught all round.

Cost..

I got these off a chap who fitted them for 6 months, he sold the car, removing a few bits and returned to stock and sold on upgrades… I only paid £230 so worth a punt.
Normally I see these £650+

We did add new rear bumper stops. The old ones were a sloppy loose fit so rattled a bit. New ones were much tighter and won’t rattle around
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Z4 3.0si - gone
Z4MR - gone
E89 35i - gone

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