01-16-2023, 05:53 PM | #23 | |
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With your help and the research I’ve done I think I can definitely say for my personal use case the Koni Special Actives are the way to go. Earlier you mentioned to cut the rubber bump stop half an inch piece, you explained why Ofc but is that from your own experience? Just As I’d rather not do it myself and I could ask the mechanic to do it but he may also ask me why in case it’s maybe not a common thing to do or if he isn’t aware. |
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01-16-2023, 05:58 PM | #24 | |
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01-16-2023, 06:15 PM | #25 | |
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You only need to trim your stock bump stops if you are also lowering with the Eibach spring kit at the same time. If you are keeping your stock spring height with your M Sport springs, then just use your stock bump stops. A mechanic who just does repair and replacement might not be familiar with the concept of adjusting bump stop height along with lowering springs. But a mechanic who does mod installations should definitely be. A serrated knife must be used to cut the bump stops cleanly at the top. I’m actually making a spring height change soon. I’m just going to buy a new set of stock bump stops, draw a line around them where I wish to cut, and then use a serrated kitchen knife on a cutting board. I’ll just hand them to my installer with the springs, perches, etc. That way I’m sure it’s done exactly the way that I want. |
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01-16-2023, 06:18 PM | #26 |
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01-16-2023, 09:42 PM | #27 | |
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Sachs is a BMW OE for dampers. You can find replacements but I believe the Bilsteins are a better price and more widely available. Here are the rubber parts to replace For the front, top to bottom Strut Mount - 31306881929 x 2 Spring pad with guard tube, top - 31306791712 x 2 Spring Pad Lower - 31336860788 x 2 For the rear, top to bottom Covering cap - 33506863445 x 2 Gasket - 33506866038 x 2 Guide support - 33506862725 x 2 Spring pad upper - 33536764419 x 2 Spring pad lower - 33536764419 x 2 Check realoem.com for a reference.
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01-18-2023, 10:51 AM | #28 | |
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johnung I was reading through your recommendation and it looks like Koni does not make special active for cars with EDC (makes sense they have their own solution). Would you recommend the KW Street Comfort in that case? I am on stock struts and H&R sport springs so ride is rough, with sport mode even rougher so want to get away from that while keeping the EDC functionality. |
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01-18-2023, 11:26 AM | #29 |
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Try searching here to see if they do have options for you
http://j13187.servers.jiffybox.net/c...chnik-excl.-m3 Just fill out your cars details at the top |
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01-18-2023, 12:15 PM | #30 | |
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The BMW Adaptive/EDC suspension is excellent. Many people swap out stock springs for aftermarket like you did. Unfortunately the H&R springs that you chose have really high spring rates, on the order of +30%, +50% or even higher. So the rough ride that you are experiencing is probably caused by the H&R springs, not the stock EDC dampers. Also if the lowering springs went on with out shortening the stock bump stops, the harshness could be exacerbated by prematurely hitting the bump stops on rough roads. Eibach springs lower the car with spring kits that are better chosen for the front & rear axle weights of specific models. Also their spring rates might only be +10% compared to stock, so some added control without added harshness. Bump stops need to be shortened for their lowering too. I agree that the expensive high tech Adaptive/EDC system that you already paid for is well worth keeping. These dampers fail when one of them starts leaking fluid which seems to happen anywhere from 45k-95k miles, a broad range. So when one leaks I recommend replacing just that front or rear pair. EDC dampers are more expensive that standard dampers so it is easier on the cash flow to only have to buy two instead of 4. And you could replace one pair and have the other pair last tens of thousands of more miles. Bilstein B4-Damptronic is probably the closest to a stock EDC replacement. I’d avoid the Bilstein B6-Damptronic for a daily driver because it is setup much more stiff. As for EDC coilovers, I would avoid Bilstein. Their spring rates are really high and mismatched for their EDC dampers. I have a buddy who likes a stiff ride and he hates the Bilstein B16-DampTronic coilovers. They are teeth rattling. The KW V2 Street Comforts are a standard type damper. KW does make EDC coilovers that are called KW DDC. They are two versions. You would want the cheaper version for cars that already have the BMW Adaptive System. The more expensive version of KW DDC is for cars that have standard dampers but want to add an EDC system to their car along with the KW DDC coilovers. Hope this helps! |
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01-18-2023, 06:13 PM | #31 | |
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I have a 2018 440i xDrive GC. The H&R sport springs came from previous owner, and I do like the ride height, but not the roughness. Do you know if the Eibach will have similar ride height? I would like to keep the EDC shocks for now and maybe replave the springs, later on I can remove the edc shocks and go with the Bilstein or KW. |
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01-19-2023, 07:23 AM | #32 | |
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01-19-2023, 09:36 AM | #33 |
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That's great news! Was reading another thread about the 05 vs 06 debate and the F80 bumpstops were mentioned, would you recommend I grab those and just replace them while I have the suspension out anyway?
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01-19-2023, 09:57 AM | #34 |
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You definitely could. I used to recommend the F80 bump stops. But I found that the stock bump stop heights vary on different cars, so now I think it’s more accurate for each application to just trim some off the top of that car’s stock bump stops. Anywhere from 3/8” minimum to about half of the expected drop is my guideline.
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01-19-2023, 10:31 PM | #35 | |
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01-20-2023, 07:41 AM | #36 | |
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And there’s the V2 Street Comfort with a less aggressive rear spring rate and a different lowering range which is plenty but provides a less aggressive minimum drop to start. All of the above are standard traditional type dampers. There’s also a KW DDC model for cars with BMW Adaptive/EDC dampers from the factory. |
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05-18-2023, 09:42 AM | #37 | |
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Reaching out to you as you’ve answered my questions in the past when I wanted to install Eibach springs on my car. I’ve recently felt like my adaptive suspension may be nearing end of life (around 57k miles) and was looking in to the koni special actives that you mentioned you are running, and deleting EDC. Unfortunately I looked at the catalog and it looks like they don’t make special actives for a 440i xdrive GC, only sport shocks. Is this correct? If so - would the sport shocks be any different (I assume firmer and more harsh). Also I am running the 05-22 springs, and I’ve seen your thoughts on “koni speak” , do you think these will be too low to run with special actives? I replaced the stock bump stops with f80 ones as well. Thanks in advance for your help! |
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05-21-2023, 04:36 PM | #38 | |
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B4-Damptronic were in short supply for awhile but seem to be available again. Typical Bilstein with up/down supply for consumer products. They prioritize car maker plants. I’ve actually talked to Koni about why they don’t list a Special Active for your car. They said that the car is already lowered from the factory and premature hitting of the bump stops confuses the FSD two valve damping system in the SA’s. They have SA models that would fit perfectly but they haven’t tested them in terms of the bump stops to be able to make a correct recommendation. But as you said the Koni Yellow Sport dampers are a bolt on replacement.. |
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05-22-2023, 12:29 PM | #39 | |
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05-23-2023, 07:02 AM | #40 | |
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I have the Koni SA’s on my car. But if my car had come from the factory with BMW Adaptive dampers then I’d be replacing them when necessary with B4-Damptronic to keep the expensive high tech EDC system |
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05-27-2023, 07:02 AM | #41 | |
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I've had the M Performance Suspension and I currently have the updated Ohlins R&T + Millway Street Camber plates on my 2014 335i RWD M Sport. The Ohlins R&T are great for track as it stays relatively flat due to the higher spring rate. But no matter what, that comes at a cost when it comes to street driving. For reference, my tire/wheel setup is 18" Apex ARC-8 18x8.5 ET38 with Michelin PS4S tires. (If I had to do this all over again I would opt for a 18x9 wheel with an ET in the 30-32 range as it would provide better clearance to your aftermarket coilover options). Since I don't plan on tracking the car this season, I'm planning on going to go back to the M Performance Suspension kit. Instead of using the M Performance Suspension Kit struts/stocks, I'm considering using the Bilstein B8s. I think the M Performance Suspension Kit springs are similar to the stock Sport suspension springs in design but with higher spring rates so I can't imagine the Bilstein B8s being completely mismatched. The body roll with the M Performance Suspension Kit (and factory anti roll bars) felt excessive. I do plan on considering an aftermarket option but read that the H&R may be too much and that the Eibach roll bars may be more appropriate. |
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09-16-2023, 03:18 AM | #42 | |
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johnung - we meet again John My RWD 340i has the 2VF suspension but it still feels exactly like cfm56d7b explained it
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I understand it's an unpopular opinion, but I'm trying to make the car as comfortable as possible for daily driving. |
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09-16-2023, 10:01 AM | #43 | |
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