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Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing. |
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11-18-2018, 04:31 PM | #323 |
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These are the only measurements I have found of the RX8 suspension at this stage, they give an idea but not very accurate.
https://photos.google.com/share/AF1Q...cxMURkaTc0MG5B .
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11-29-2018, 05:53 AM | #324 |
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I purchased a pair of RX8 front uprights tonight, I was planning to buy the whole front end but I could not find one for the money I was willing to spend.
While I was there the guy was nice enough to let me take some measurements of the RX8 control arms. As it turns out if you compare the distance of the lower control arm inner pivot across to the face the wheel bolts to for the BRZ and the RX8, the RX8 is actually only about 19mm longer. Anyway I am pushing ahead with my conversion from mac strut to double wishbone. I won't hijack this thread any longer so if you want to follow the progress then keep an eye my build thread for updates.
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Last edited by DIY; 11-30-2018 at 02:46 AM. Reason: more precise measurement |
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01-21-2020, 07:09 AM | #325 |
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The RX8 uprights are now mounted on my BRZ, for the most part the double wishbone conversion is complete. I have extended my wheelbase by 35mm mostly so that the steering rack will clear the crank pulley since the rack is now in front of my Honda K24 engine.
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01-24-2020, 04:38 PM | #326 |
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Wow.. Beefy control arms much? looks like roll case size tubing. 1 1/4 at least.
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01-24-2020, 08:26 PM | #327 | |
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Quote:
Most roll cage is 1.5" with a 1.75" main hoop. The shock must mount directly to the lower control arm so strength is needed. You could use a smaller tube with chromoly but I prefer to work with mild steel.
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01-30-2020, 04:21 PM | #328 |
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Why the preference over chromoly? Cost? Material characteristics? Keep the progress coming!
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02-02-2020, 02:56 AM | #329 |
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Mostly the material characteristics, my day job is as a material scientist so I have a pretty good understanding of this. I am not a professional welder, if you follow my build thread you would see I only began welding about 6 months before starting the project, all self taught, reading, youtube tutorials etc. Chromoly weighs the same as mild steel but it is stronger so you can use smaller tube, thinner wall to save weight. The downside is you must weld it following strict guidelines, your welding technique must be on point or you can end up with brittle welds. Mild steel is much more forgiving to weld so I see less risk in using it and I take the weight penalty.
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02-05-2020, 05:34 PM | #330 | |
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Quote:
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06-08-2020, 07:01 PM | #331 |
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I have no background in engineering or physics or any kind. I can do basic math and I’m just trying to learn to get the proper coilovers setup by having numbers guide/help me. Natural frequency, motion ration and such. Just reading through the whole thread and all intrigues me and that is why i’m posting. Not trying to derail the thread or cause any trouble. If I offend anybody, I am sorry and i can delete this post right away, just let me know.
I came across this website but they are using a different car and trying to plug in numbers that is already posted in this site. Thank you so much and you guys are awesome! Not really sure if I can use the formula that the guy had in there but i don’t have the numbers like axle weight and wheel weight. Could this be applicable in our car? https://drivetribe.com/p/lets-talk-s...TuOW5CN4C8x7JA |
06-09-2020, 09:28 AM | #332 | |
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There are a lot of "rules of thumb" but none of them are perfect! Decent starting points though. - Andrew |
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06-09-2020, 11:54 AM | #333 |
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It is giving me numbers that I'm like "wait I don't want those frequencies in my setup" but I don't have all the numbers needed and like you said there is more factors that is in the equation. Thank you though for your input. I appreciate it!
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06-09-2020, 12:29 PM | #334 | |
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Many top level suspension engineers are not that concerned with some of the usual flat ride suspension frequency "rules of thumb". - Andrew |
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