10-10-2019, 07:58 PM | #23 | |
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The B58 is closed deck with forged internals, so I'll bet we see some great numbers from it. The point is, the ZF8 has sturdier versions than what got put in this car, and it still strikes as a weak point relative to what the B58 can produce. Last edited by Dreculah; 10-19-2019 at 09:06 AM.. |
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10-17-2019, 08:18 PM | #24 | |
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5th in the 6 speed (not 4th) and 6th in the 8 speed both have the low torque limits, and both are the 1:1 drives... Perhaps transferring torque through fewer gear sets = lower mechanical limits? Any mechanical engineers care to chime in? |
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10-18-2019, 01:01 PM | #25 | |
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As much as a tried to find some common mode of operation between gears 3 & 6, I could not. Perhaps they have torque limitations for different reasons. I think it's safe to say, this automatic is much more complicated than I realized. So thank you again for the link! |
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10-21-2019, 04:00 PM | #26 |
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I asked ZF why the ZF8 in our cars has a lower torque rating than models higher in their range, and this is what they said:
"The 8hp 45/50 is a smaller version of the 8hp70/75. The clutch drums, planet sets and TC are of a larger diameter. The components are able to handle more input torque as a result of the sturdiness of the components." |
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10-31-2019, 04:59 PM | #27 |
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11-08-2019, 08:09 PM | #28 |
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I don't know what the second page of responses has for you, but after reading the first page, no one had an educated or first hand knowledge based response. For good reason. I'm sure there is no true number that says you can push it to here, but beyond is dangerous. The manufacturer recommended what they did. Anything beyond that science is up to us to figure out. We haven't figured it out yet. That's a long term game, based on a lot of factors.
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05-25-2021, 05:27 PM | #30 |
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hey yall i have a 340i RWD 2018 with bootmode3 stg 2 93 and had xhp on stg 2 my transmission was fucked after about 10,000 miles but it wasnt because of transmission failure it was actually tranny cooler failure so if you want to upgrade something upgrade your tranny cooler cause if that blows your done good news is car was covered under warranty
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11-05-2021, 05:17 AM | #31 | |
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https://www.instagram.com/f22ruben/ |
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11-05-2021, 09:23 AM | #32 |
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Kern417 is constantly putting together well made youtube videos of the B58.
https://f30.bimmerpost.com/forums/sh....php?t=1871349 This link has his "writeup" of the transmissions (I assume the 2er and 3er get the same one). |
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11-06-2021, 07:32 PM | #33 | |
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2021 EB M240 6MT: TC Kline Camber Plates & Coilovers, Eventuri CAI, AA Catted DP, Remus Non-Res Catback, FTP CP; M Front Lip, Rockers, Mirrors, Spoiler, Interior
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