H&R springs or Eibach springs?

[dukeofchen]

I'm quite certain they are designed to work with the stock springs, so they wouldn't need to offer a different bumpstop. Just because they are offered in lowering spring packages by other manufacturers doesn't mean they are designed for them.

Yeah to my knowledge Eibach themselves provide guidance on bump stops for spring applications to other cars, but in my searches I haven't come across an official confirmation either way for our platform.

Given they're very slightly stiffer than stock, maybe they aimed to compensate for the drop all else the same? I guess at the end of the day it's unreasonable to apply lowering springs in isolation and expect a 1:1 ride. This setup is the only one I've known the entire time I've owned the car, but the crashiness has never sat right with me.

Anyone out there want to bench test the least sexy aftermarket combination for our cars? It's always been a burning question in my mind even if the actual answer is to cut 0.5mm 😂

[01SG]

I emailed Koni and will see what they say. OEM bumpstops are very pricey. There are some cheapo ones on rockauto but I dont know what lenght they are. Koni should include these in their kit, especially since they sell bumpstops

I'm quite certain they are designed to work with the stock springs, so they wouldn't need to offer a different bumpstop. Just because they are offered in lowering spring packages by other manufacturers doesn't mean they are designed for them.

[Maxima SE]

The eternal question. I've seen this question posed over the years across forums and never once a clear answer lol (I'm not running that setup so I can't help). With this being one of the most popular setups you would think someone could give a definitive answer.

I emailed Koni and will see what they say. OEM bumpstops are very pricey. There are some cheapo ones on rockauto but I dont know what lenght they are. Koni should include these in their kit, especially since they sell bumpstops

[oceansize]

What bump stops are recommended with Koni yellow and eibach ?

The eternal question. I've seen this question posed over the years across forums and never once a clear answer lol (I'm not running that setup so I can't help). With this being one of the most popular setups you would think someone could give a definitive answer.

[Maxima SE]

What bump stops are recommended with Koni yellow and eibach ?

[cobra]

I've asked before but figure it might get more traction in this thread. Since the reduction in travel from lowering on Eibachs rides the bump stops more, jacking up the progressive spring rate, wouldn't it seem that slightly trimming the OE bump stops would alleviate the issue, assuming you remain safely within the limits of the Koni shock? Apparently back in the day Dinan offered pre-trimmed bump stops with their kit, but it seems the measurements have been lost with time.

And if so, how would you guys think about determining that safe limit? I presume the amount to trim would be less than the actual difference in ride height.

The spring rate and progression stays the same as you lower it. Depending on where you're sitting in the spring rate curve, this may or may not make a real difference.

There are different theories about how to use your bump stop. You can use a long polyurethane bump stop and rely on it as part of your spring rate to create sort of a progressive spring, or you can run a short stiff bump stop that you won't encounter during normal driving. It's merely to prevent a harsh crashing of metal parts. By cutting a soft/stock bump stop, you do run the risk of some harsher bottom out events because it won't do much. Bry5on did some experiments here on his Dinan setup and advised against shortening the bump stops.

I personally prefer a shorter stiffer bump stop for a more linear feel and making sure the springs are stiff enough, but know that once you use up your travel you will feel a notable change.

[dukeofchen]

I've asked before but figure it might get more traction in this thread. Since the reduction in travel from lowering on Eibachs rides the bump stops more, jacking up the progressive spring rate, wouldn't it seem that slightly trimming the OE bump stops would alleviate the issue, assuming you remain safely within the limits of the Koni shock? Apparently back in the day Dinan offered pre-trimmed bump stops with their kit, but it seems the measurements have been lost with time.

And if so, how would you guys think about determining that safe limit? I presume the amount to trim would be less than the actual difference in ride height.

[Leafsrule531]

Which sizes and rates did you go with? I’m toying with the idea of trying linear springs on my Clubsport dampers maybe sometime in the next year.

I ended up going with the following based on recommendations from swift. 559 lbs is a bit on the higher side for a street car but my ride is still pretty smooth yet firm. It does hit hard though when you do end up hitting a bad pothole but overall I am very happy with switching over. long story short, I had to switch to these springs to install my ground control camber plates.

https://motorsportsammo.com/products/swift-metric-coilover-spring-id-60mm-7-length?_pos=1&_sid=0a0499450&_ss=r&variant=37833239492

[EthanolTurbo]

No. B12 is Bilstein shocks and eibach. https://www.turnermotorsport.com/p-2...nsion-package/

The Koni kit is Koni yellows and Eibach. https://www.turnermotorsport.com/p-5...e-convertible/


This post shows how the B12 sits higher than Koni's




https://nam3forum.com/forums/forum/m...6772#post76772

Sorry, I read your post wrong. I thought it said the B6 Shocks and Eibach springs are different than the B12 kit.

[Maxima SE]

That makes no sense as the B12 kit is just the Konis and Eibach Pro Kit springs packaged together. They're the exact same thing.

No. B12 is Bilstein shocks and eibach. https://www.turnermotorsport.com/p-2...nsion-package/

The Koni kit is Koni yellows and Eibach. https://www.turnermotorsport.com/p-5...e-convertible/


This post shows how the B12 sits higher than Koni's

1st is Koni/eibach. Then koni rear B12 front. Then B12

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/71642-my-review-koni-yellows-eibach-springs-on-a-daily-driven-m3?p=76772#post76772

[Nate047]

Correction, they were B6, not B8. My bad.

[maupineda]

don't shoot the messenger, I know there are B12 kits, which by definition have B8 shocks (shorter), but the M cars being already lower v non M, the B12 kits are just lower springs + B6. which is idiotic as they are taking bump travel away.

[EthanolTurbo]

They make the B6 which is included with the eibachs in the B12 pro kit. There is another thread with comparison pics of B12 kit and Koni/Eibach and the B12 sits a little higher. Koni/Eibach is the way to go.

That makes no sense as the B12 kit is just the Konis and Eibach Pro Kit springs packaged together. They're the exact same thing.

[Maxima SE]

There is no B8 for E46 M.

They make the B6 which is included with the eibachs in the B12 pro kit. There is another thread with comparison pics of B12 kit and Koni/Eibach and the B12 sits a little higher. Koni/Eibach is the way to go.

[maupineda]

There is no B8 for E46 M.