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08-25-2021, 05:49 PM | #67 | |
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08-25-2021, 08:13 PM | #68 |
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tlrid3r I'm excited to see what you can do at Laguna after some testing!
Looks great! Do you know how much roll center correction is required for 10mm below competition package? I'm guessing that's 20mm from factory height if you were talking the standard height.
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08-25-2021, 09:53 PM | #69 |
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Correct. Comp pack plus 10mm below is about 20mm. From my measurements going positive on roll center correction doesn't have a negative affect. But just because I said 16mm of roll center correction that # means very little. Its the amount offset allowed with in the oem subframe mount hard points. The real # that will make an affect is the amount of degree change the arm gains. At 25mm lowered you are back at oem roll center. Lowered further than 25mm you start to lose a bit of roll center correction. Less than 25mm lowered you are positive on roll center correction. Might be better but I haven't tested.
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08-26-2021, 11:05 PM | #70 | |
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You are making me regret not getting in on that Strom group buy now..haha
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08-27-2021, 12:33 PM | #71 | ||
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08-27-2021, 03:15 PM | #72 | |
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Do you plan to make a few extra sets of your rear sphericals?
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08-27-2021, 04:05 PM | #73 | |
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Could also move the subframe up a bit with these (12mm of correction for extra $):
http://www.mk-motorsportteile.de/epages/63717011.mobile/en_GB/?ObjectPath=/Shops/63717011/Products/%22Alu%20Lager%20e92%22 Quote:
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08-27-2021, 04:55 PM | #74 |
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Ha! I have the BW subframe bushings installed on my car, they dont correct for roll center that I am aware of. It doesnt make sense to me that moving the subframe away from the car corrects geometery as that would further make it worse. Moving it up as the car is lowered makes more sense to correct geometery.
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08-27-2021, 05:08 PM | #75 | |
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08-27-2021, 10:35 PM | #76 | |
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I can, but I paid a big penny for these. Mainly because the low quantity run with the machine shop. I purchased all the spherical bearings at full price, I didn't get any discount. Only thing I regret is having the bushing black anodized, they get scratched with a press fit install, I would do clear anodizing, plus it cost less. I didn't cheap out on anything. I also did several 3D printed parts to check fitment and design which also cost a lot. In all I spent $3100. I would have to do at least enough for 10 cars to be able to bring the cost down. I think the cost has to be cut to at least half or else just buy Schirmer or MK parts. I think we need a group-buy to be set up. Also a little update, I finished the complete install, I got to drive the car to my work to use a lift so I can do a string alignment. It feels more hooked, I feel like I have more grip, my street wheels have 275 square PS4S, I hope it's not placebo. I will soon do a track test, but it has just been too hot here in California, plus all the fires are not so pleasant. My track wheel runs 295 square AR1's. Here is a little video of the suspension motion and where the control arms end up at ride height with my Hubstands that I also made. They are perfectly horizontal from pivot point to pivot point. FullSizeRender Bonus picture (In home HubStand setup) Only way I can properly do suspension development at ride height and get proper measurements.
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08-27-2021, 10:40 PM | #77 | |
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but I can't find any real info on that.
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08-28-2021, 12:36 AM | #78 | |
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08-28-2021, 01:28 AM | #79 |
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@derbo
I'll gather more details and finish my testing. Than I can look into group buy. Again I think if there is enough people it's possible to bring the price down to maybe $1400 to $1500. Maybe even cheaper. MK bushing is $1850 mainly because international ship. Schirmer is $2400+ Only reason I didn't just buy one those is because I working on other development stuff for my car. https://flic.kr/p/2mjApct Not sure if this works. If not I'll fix it tomorrow
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08-28-2021, 01:59 AM | #80 | |
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08-28-2021, 10:10 AM | #81 | |
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Trying to balance your feedback of the roll correction amount you have achieved against the ride height changes you have made.
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08-28-2021, 10:24 AM | #82 | ||
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18" wheel Front 580mm Rear 564mm This is measured from bottom of rim lip to fender edge.
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08-28-2021, 10:54 AM | #83 |
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I just got the fall line LCA. It comes with a camber shim set. Does this help with roll center correction, or does it need to be in the bushing?
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08-28-2021, 11:38 AM | #85 |
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Nope. The arm pivot points need to be moved up or down in order to change roll center.
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08-28-2021, 12:22 PM | #86 | |||
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derbo is correct.
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08-28-2021, 05:49 PM | #87 |
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Great accomplishment, and I look forward to the results on the track! From what I see, you did correction on the camber link. Did you consider correction on the rest of the arms? If not, why? Thanks.
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08-28-2021, 10:06 PM | #88 | |
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2 eccentric bushing with spherical bearing internals for Camber arm (Roll Center correction) 2 eccentric bushing with spherical bearing internals for trailing arm (bump steer correction) Per side of the car.
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