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05-31-2017, 05:12 PM | #46 | |
KYHOMPB
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First of all I think what you did here is totally awesome!! Great overall ingenuity and things like this are what make Bimmerpost the best car forum on the interwebz ![]() With all that being said I do have a couple concerns on the design however and just wanted to point them out before you start mass producing these. 1. The little plastic part circled below is the custom portion of the plastic base that is used to screw into the E9X paddles correct? If so, do you believe this piece is strong & robust enough to hold up to thousands of shifts overtime? Reason I believe this part might be the weak link of the design is because if you look at how the F8X paddles attach to the base you can see that there's a flat metal piece that extends from the paddle and this piece slides into the plastic base and screws in about 3/4" of the way down effectively strengthening the thin plastic OEM base. 2. The angle at which the E9X paddles mount to the custom plastic base seems much greater in comparison to the stock OEM LCI paddles. How exactly did you calculate this angle? Just from the few photos you've post it looks like if you mounted everything up including the OEM plastic boot adapter piece that attaches over the electronics then the face of the E9X paddles wouldn't be parallel to the steering wheel. Would you be able to take a sideview photo of the paddles mounted up to the steering wheel? 3. This is just a thought but I believe if people have upgraded to an actual E9X M3 steering wheel the whole assembly might not physically mount up correctly. The reason I bring this up is because when I did my retrofit the E9X paddle assembly didn't mount seamlessly to the back of my OEM M-Sport steering wheel (i.e. there's a bit of a gap). This makes me think that the OEM plastic adapter boot piece would not work with an actual E9X M3 steering wheel. Could be totally wrong here though lol. Does anyone have any experience with this? |
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05-31-2017, 06:30 PM | #47 | |||
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As I stated above I have literally stepped on a bracket with one side of it supported by a piece of wood and it didn't budge. I will freely admit I am not a heavy dude, but I assure you if I supported the stock pin or PCB in and stepped on a paddle I would break something. As for longevity. That is an interesting question. But two things: 1) The stock paddle is actually an aluminum paddle impregnated with a plastic mounting surface. 2) If I look up papers on longevity of polycarbonate (honestly even ANY plastic I suspect) we aren't even in the picture of fatigue. I am including a study done on mechanical and thermal fatigue of PC done by those much smarter than myself (I am an engineer but not a mechanical or chemical engineer). Here is an excerpt: "The Lexan141R material was injection moulded into tensile bars according to ASTM-D638, having a gauge length of 100 mm and crosssectional area of 3x10 mm2" That cross sectional area is smaller than the failure point we are talking about here. Using that they collected long term failure data with a certain amount of stress which results in this graph: Mine would follow the non-annealed line (lower of the two lines). What does this say? Well it says the failure is not measureable below lets say 40MPa or so. The stress we put on the paddle is a few orders of magnitude smaller than 40 Mpa (~5800 psi). Even leaving in some room for margin/error this certainly agrees with what I am seeing with physically standing on the part. Most importantly it shows that if you stay within reasonable limits of the part it simply doesn't fail due to applied stress. https://pure.tue.nl/ws/files/1927251...3620967040.pdf Quote:
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Interestingly enough I actually will be replacing my steering wheel with an E9x steering wheel since mine is a little chewed up and I found an M3 replacement for a reasonable cost. So this is something I could actually test out... and probably should considering I will be using these ![]() It may simply fit right up. If its a small tweak then I could offer two different types. If they are dramatically different then I agree it is possible that the adapter wouldn't work at all. Last edited by WhatsADSM; 05-31-2017 at 06:46 PM.. |
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05-31-2017, 06:42 PM | #48 |
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Also found a picture (courtesy of ESS) of the internals of the E9x M3 paddle (which I have also taken apart before). You can see the size of the plastic parts here that BMW deems acceptable for lifetime stress. There is a large arm there with a cross sectional area considerably smaller than the cross sectional area of what I am using here.
Last edited by WhatsADSM; 05-31-2017 at 06:48 PM.. |
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05-31-2017, 08:48 PM | #49 |
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Here are the requested side view pictures. Also shown are my hands holding the wheel and the stalks fully depressed.
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06-16-2017, 03:17 AM | #50 |
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looks good !!
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03-20-2018, 04:25 PM | #51 |
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Sorry if this is a dumb question, but does anyone know if this works on the older steptronic paddles?
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03-20-2018, 04:31 PM | #52 | |
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https://www.nelson racing wheel.com/paddle-shifters
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04-27-2018, 06:31 AM | #54 |
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I don't think so. These will fit DCT transmission no problem.
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07-02-2018, 07:11 PM | #55 |
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So to bring this back again. I have a 2011 135i with DCT. Would I would need the e9x m style or f20 paddles? And we’d need to fabricate a bracket like yours. I’d like to buy these if available.
Sorry I’m reading the testing part you did and can’t determine which paddles you ended up with in the end. How do we get this 3D printed part. |
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07-03-2018, 01:36 PM | #56 | |
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07-03-2018, 03:08 PM | #57 |
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Or follow the suggestion to go with the Nelson Racing Wheel paddle kit like I did:
https://www.1addicts.com/forums/show...n+racing+wheel |
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07-03-2018, 08:09 PM | #58 | |
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07-04-2018, 08:46 PM | #60 |
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Thanks, they are from European Auto Source, pinged then thru the M3 forums since they are from an E92.
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06-03-2020, 03:19 AM | #62 |
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Thanks to this thread I went ahead and bought some cheap China paddles for F series.
https://www.ebay.com.au/itm/Aluminum...72.m2749.l2649 They worked perfectly. Only a 45 minute job to replace my OEM peeling plastic paddles. Last edited by YakuzaWAFD; 06-03-2020 at 05:40 AM.. |
06-03-2020, 12:45 PM | #63 |
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How is it driving with the larger paddles. Do they get in the way or is it more convenient? Do they feel solid?
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06-04-2020, 01:49 AM | #64 | |
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They're solid unless you try to shift them at the very top as they can flex. I have found that my fingers naturally rest on them so they don't feel in the way. The aluminium is a much nicer feel than the plastic. |
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