06-01-2020, 03:43 PM | #23 | |
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I plugged my numbers in under the custom setting and the range of spring rates that can be used to meet the flat ride threshold is substantial. |
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07-14-2020, 02:41 PM | #24 |
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I just got the spring rates for my ST suspension springs for ActiveHybrid f30, they say 23N/mm front, 27N/mm rear (130 and 154 lbs/in) seems far off from what you have for other models...
i can't run the calculator off my ipad now but what do you make of these? Makes sense considering the 50/50 weight distribution? I asked eibach spring rates for AH3 to compare, no answer yet. Thanks!
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07-14-2020, 02:54 PM | #25 | |
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07-15-2020, 06:46 AM | #26 | ||
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Still, KW confirmed 23 n/mm front - 27n/mm rear, considering the brevity of their answer i didn't get much more... could be at wheel indeed. Eibach (Germany) responded but declined to provide spring rates, they consider this is confidential info. not so easy to compare products!
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07-16-2020, 12:29 AM | #27 | |
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As far as Eibach goes, the AH3 kit is E10-20-031-05-22 with spring rates 34N/mm front and 95N/mm rear.
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07-16-2020, 01:21 AM | #28 | ||
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07-22-2020, 11:05 AM | #29 |
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They are usually re-valved to match and they provide a shock dyno (I believe FA does)
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09-02-2020, 10:10 AM | #31 |
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Am I missing something, the download link isn't working for me?
Looking at the Fortune Auto 500 series with swift springs at 5k / 16k as per Farkles recommendation on another thread. Has someone already plugged these numbers in? 2017 340i rwd
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09-02-2020, 10:16 AM | #32 |
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Works fine for me. I just clicked on the link and the download window appeared.
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09-02-2020, 10:25 AM | #33 |
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Link works for me as well. Now I just gotta watch the video to learn how to use it.
FaRKle! , do you remember which thread it was that you recommended spring rates? |
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09-02-2020, 11:40 AM | #34 |
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I'm a dummy, I thought the link was taking us to Fat Cat's website. When I clicked it, it was flashing the screen but didnt realize it was actually downloading it in my downloads folder. So I have about 6 copies now
Looks like those rates work itsrichierich , this was the thread I was referring to https://f30.bimmerpost.com/forums/sh....php?t=1668220
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09-02-2020, 12:15 PM | #35 | |
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09-06-2020, 09:07 AM | #36 |
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this calculator is great! definitely a new found understanding on spring rates for me. thanks FaRKle!
pauli18c I'm interested in the 500 series FA coils too with swift springs like FaRKle! suggest at 5k/16k. I wonder what FA has to say about that setup. |
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09-16-2020, 05:26 PM | #37 |
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Not sure if anyone noticed, but when downloading the file on a computer, it doesn't show the vehicle's weight and etc. But when downloading on a phone, it shows that information.
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09-17-2020, 06:44 AM | #38 | |
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https://f30.bimmerpost.com/forums/sh....php?t=1668220
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11-23-2020, 09:54 PM | #39 |
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Using the calculator, stock springs on a set of coilovers I am looking at comes with 400/575lb springs, and works out to 0.79 bounce freq ratio. For perspective, the B16 show a ratio of 0.77 using the data there.
Keeping the front which is around 7.1K and increasing the rear to 10K (1000lb) I can get flat ride at a ratio of 1.04 R/F. The minimum rear rate for flat ride is 932lbs. Is the difference discernible to occupants? For dual duty, some HPDE events next season, and DD with an infant in the back would this be too stiff? The coilovers are adjustable (20 clicks).
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Last edited by Logicoeur; 11-24-2020 at 10:16 AM.. |
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11-24-2020, 11:17 PM | #40 | |
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B16 rears with a 1000lbs/in spring is still more comfortable than my stock M2C's rear suspension. I recommend starting at damper setting 7 (this is what I tuned an F32 with B16s and 1000lbs/in rear springs to). Also, depending on how low you want to run the rear ride height, you might want to trim the bump stop a bit too. To do that cut the zip tie on the rubber boot, then pull it back to expose the bump stop and then cut it while it's still on the shaft. You'll need a new zip tie to secure the boot to the damper after.
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11-25-2020, 07:39 AM | #41 | ||
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They are Flatout Suspension ST coilovers.
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11-25-2020, 10:17 AM | #42 | |
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And if you're on a budget, look at QA1 springs.
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11-25-2020, 10:33 AM | #43 | |
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I will mess with the dampening more when at the track but for daily commutes with includes 80% of highway, it's perfect. At first I was skeptical of Drew's recommendation, but after paying close attention and reading his responses to this subject matter, watching his videos and actually talking to him, he's very knowledgeable on this subject. Last edited by itsrichierich; 11-25-2020 at 11:39 AM.. |
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11-26-2020, 02:09 AM | #44 |
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For the guys in the Bay Area and wanting the Bilstein PSS10, check these out: https://www.facebook.com/marketplace...6792258451287/
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