I have taken legal action in the past to defend my intellectual property and I prefer to not go down that route again.Visitors who use this website and rely on any information do so at their own risk. I don't want to begin pulling spreadsheets off my website, but I'll appreciate the community's support in reporting copyright violations like this. This is the first time someone has blatantly attempted to knock off this spreadsheet, which took me significant time and expense to gather information and refine to the point it is now. While I appreciate the enthusiasm to create better analytics for different suspensions, it is NOT acceptable to copy, alter, and publish my own original copyrighted work. I'm working with him to create a free online spreadsheet of the Ride Harmony spreadsheet for anyone to use on my business website. As you already know, 'FaRKle!' (Andrew) is very well-informed and has studied / analyzed the F3x chassis and variations more than anyone I know. I've been working with Andrew and a few other F3x owners for some time. This isn't how I would have intended to introduce myself, but I was compelled into action. Note that RWD vehicle front sway bars have thicker ODs than xDrive bars, however the lever arms are longer than xDrive bars. Everything else is just a lever arm to transfer force to that "main straight" section. For thickness you should use the OD of the "main straight" section since that's where the torsion loading is. Typically the arms are thicker than the center "main straight" portion. KW SC doesn't have flat ride in my calculator by about 2%.įor front sway bars BMW has variable thickness ones. Using the published curb weight (from BMW NA, not EU), published weight distribution (from BMW NA, not EU), and subtracting unsprung weight are components I used in my own calculator. Some of the component weights vary by model too (such as drive axles, luckily their contribution is pretty small though). There are other sources out there you can use to verify the weight/decimal place. RealOEM has the information, but the decimal places aren't always in the right spot. To do this you'll need to look up the weights of all of the unsprung mass and subtract that from the curb weight. One thing you need to be careful about when doing calcs is using sprung weight vs curb weight. Nothing really "all-in-one" though that's public. The spring rates for Bilstein, and all of the BC-type coilovers are posted, and some KWs. There are NO coilovers I've seen aside from Ohlins R&T that have flat ride (and those only have it for a 6cyl engine RWD F30/32 vehicles). Flat ride ratios tend to be about 10%, with exception of the F32 at around 4%. Unloaded, base suspensions are around 1.2Hz front ride freq, M-Sport about 1.33Hz front, and M-Perf in the 1.5-1.55Hz front range. The rear damper motion ratio is 0.84, and the spring motion ratio is 0.59.Īs for spring rates, there are too many to list, and it varies within model due to options (weight). But there's some proprietary info in there that I'm not willing to release.įront motion ratio is 0.96. I measured/acquired that info to make my own calculators for ride height, ride frequency, and flat ride. I have virtually all of the information you're asking for and have posted things here and there. If we can compile a list of this info we could use a calculator to make much more informed decisions for suspension setups on this chassis.Īre you working with Shaikh on a project for your F3x? Just the drop range like that's the only important piece of info you need! I'm specifically looking for 340i base suspension RWD AT, but all variations would be useful for comparison.Įven more surprising is a lot of coilovers don't readily list the spring rates they ship with. If anybody knows what oem spring rates for the various versions of the f30 are that would be helpful. I'm also finding it surprising difficult to find info on oem spring rates and swaybars. This can be measured at home but I'm hoping someone has already done that hard work. Does anyone have any info on the details needed specific to this chassis? Mainly need suspension motion ratios for front and rear. This was pretty common practice for track/autocrossers. In the miata world I used to use a calculator to understand the ride quality and handling characteristics that different spring rate and swaybar adjustments would make.
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