03-17-2019, 12:04 PM | #89 |
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Keep in mind the new M5 uses our transmission so it's capable of handling all that torque, but we may have some sort of torque limits set from the factory that can be removed from a transmission flash. I spoke to Alex a while back and it seems like hes in the market to only sell his transmission flash if you're planning on running one of his ecu software. We might not even need a flash only time will tell when these boring beta days are over.
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03-17-2019, 12:56 PM | #90 | |
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https://en.m.wikipedia.org/wiki/ZF_8HP_transmission Edit - M5 uses 8HP75, not same transmission. Last edited by GT500R; 03-17-2019 at 01:05 PM.. |
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03-17-2019, 01:56 PM | #92 | |
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03-17-2019, 02:02 PM | #93 |
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03-17-2019, 02:10 PM | #94 | |
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People are running way beyond that too without the gearbox exploding, but hard to know how long it will last. But in general my impression is that the ZF is very durable and people are running them way past their rated limit. To take my implementation as an example (330e), the stock torque is 420nm, and the torque limiter is at 550nm. So I guess that in itself is an interesting fact. The stock torque limiter is actually 10% higher than the rating of the gearbox. So they're probably pretty confident it can take at least that much.
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03-17-2019, 02:13 PM | #95 |
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Damn, so only 1 ft lb more than an M240i makes when stock. Seems odd.
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03-17-2019, 02:15 PM | #96 | |
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It's right there in the wikipedia link posted above. And it's correct. EDIT: To make it easy for you, that's actually what the 50 stands for 8HP45 (previous generation) had 450nm, the 50 has 500nm, the 8HP75 is 750nm, etc.
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03-17-2019, 03:44 PM | #97 |
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Yes, I've seen the Wiki page. But regardless, that doesn't make it any less odd that the transmission is rated for the exact output of one of the cars it's used in (actually a fraction of a ft lb less, if we're splitting hairs). 500 NM = 368.78 ft lbs. I'll have to assume the ratings are very conservative.
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03-17-2019, 03:49 PM | #98 | |
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Rather, the "seems odd" purports that either BMW thinks it's okay to run it right on the ragged edge of its rating (of course this is wrong lol), or the ZF8 can take WAAAAY more torque than it's rated for. <- That's probably our winner lol. We can probably assume some 10-20%+ headroom. So a stage 1 or even stage 2 tune should be fine for the stock trans. Hell, the manual is rated even lower and people have been pushing 600+ from N54 days (they have the same 6MT).
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03-18-2019, 08:09 AM | #102 | |
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Intuitively that doesn't make sense to me unless the transmission is purposely slipping clutches above its programmed limit. I could understand an ECU flash changing the torque. Help me understand! |
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03-18-2019, 08:12 AM | #103 | |
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03-18-2019, 08:17 AM | #104 |
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The part number is 13628637896 but I can't find a rating anywhere. With our stock boost levels, idk why BMW would fit one larger than 2.5 bar. That would still support 21-22psi
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03-18-2019, 11:33 AM | #106 |
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^^
I saw that yesterday. Looks like Paul is tuning the wife’s grocery getter.
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03-18-2019, 11:41 AM | #107 |
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That’s pretty good for no bolt ons.
Here is mine with no bolt ons and on E30.. and letting off at the end.
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03-18-2019, 12:11 PM | #108 | |
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03-18-2019, 01:24 PM | #109 |
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Correct, tune only. I wish I had a full E85 tune to run, maybe Alex is looking for those fuel maps as we speak
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03-18-2019, 02:34 PM | #110 |
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