Lordy, yes, for a turbo, I'd be shopping for a 188!
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3.23 607 Open Rear Differential?
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Originally posted by Wanganstyle View PostBmw matches size of rear end to displacement / engine output.
This would be the smart way to think; bmw did put a 210mm rear with some m30b35’s ; they would have put in a 168mm if it was adequate size for gearing.
The measurement refers to the diameter of the ring gear which reflects the strength of the complete unit.
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Originally posted by mini612 View PostTobyB, thanks for the info. I really don’t know the history of this car. I bought the car from CA in 2012, and transport the car back to MN. At that time it had what seems to be a 2.7l jetronic motor and not the euro 2.3 motor. So I swapped out the motor for an m30 motor w g268 tranny, completed near the end of 2012. I recently sold the m30 setup and currently building an m50nv turbo.
I hear everywhere that these small casing rear diff can’t stand higher power, and then I swear I read somewhere that a specific smaller casing diff can, I just can’t rememebr which one or was I hallucinating.
Bmw matches size of rear end to displacement / engine output.
This would be the smart way to think; bmw did put a 210mm rear with some m30b35’s ; they would have put in a 168mm if it was adequate size for gearing.
The measurement refers to the diameter of the ring gear which reflects the strength of the complete unit.
Leave a comment:
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TobyB, thanks for the info. I really don’t know the history of this car. I bought the car from CA in 2012, and transport the car back to MN. At that time it had what seems to be a 2.7l jetronic motor and not the euro 2.3 motor. So I swapped out the motor for an m30 motor w g268 tranny, completed near the end of 2012. I recently sold the m30 setup and currently building an m50nv turbo.
I hear everywhere that these small casing rear diff can’t stand higher power, and then I swear I read somewhere that a specific smaller casing diff can, I just can’t rememebr which one or was I hallucinating.
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Wow. I thought that the lowest common small- case was the 3.46 in the ti/ manual 1.8 E36.
(yes, the 2002 turbo had a 3.36, but they made 12 of those)
The E21 small case from 9-79 to late 1983 is unique in the US market in that it has 6 side case bolts
and a bigger pinion nose bearing. And better spider gears.
It doesn't look like that's what you have, though- that looks like what's under a 4 cylinder E30 or E36 compact.
It's pretty stout, and it's #30+ lighter (54 vs 88) so if it's healthy, it's worth keeping.
One thing to check on realoem.com- see if the front pinion bearing is common to the later E21, or if it's the smaller
one that fits everything from the '68 2002 to the 98 318ti.
t
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3.23 607 Open Rear Differential?
I have a 1983/84 BMW E30 Euro 323i with this rear differential. And yes it's an open diff, and yes it's a small casing. The numbers on the tag: 3.23 607. I know, I am switching over to an LSD and the bigger case, 188, but before I do that, I simple want more information on this diff. I read somewhere, I can't really remember when or where I read this information but I think it said something about this small case E30 diff is the stronger of the small case differentials... ---> ?. I can't recall! And yes, i've search the net and i know the the basics such as, 323i before 9/84 came with this diff., and then there's a lot of info on the Z3 M roadster rear differential which is totally different. But if anyone have any information on this differential, please let me know. Thanks!!Last edited by mini612; 05-02-2019, 08:26 PM.Tags: None
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