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Spec E46 racing - rule change proposals
Spec E46 racing class rule change proposals forum

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Old 12-04-2018, 07:04 AM   #1
nikoror
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Driveshaft rule clarification

Hi, i am trying to understand if we can use the 4bolt u-joint driveshaft or only the 6-bolt cv joint driveshaft is allowed? Replacing the cv is expensive and using a 4bolt diff makes swaps of the 3.46 easier. I dont think there are performance advantages either way.

Thanks,
Nik


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Old 12-21-2018, 02:30 PM   #2
nikoror
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Driveshaft rule clarification

Maybe a picture helps. The diff on the left is original from the 330i the one on the right is a 3.46 from a z4 automatic and has the finned diff cover. Those diffs are pretty cheap on ebay and swapping the halfshaft flanges takes 10min but not so sure about swapping the driveshaft flange. Can we keep it and use an automatic driveshaft?
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Old 01-27-2019, 11:19 AM   #3
MrFabulous
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Driveshafts and the corresponding flanges are not bound by rules. If you start with an automatic car you do not have to change any of the other driveline when swapping a manual.

Swapping the drive flange is easy as well. Simplest way is to mark the nut and the shaft. Undo the nut, swap flanges and tighten until the marks line up again. Not perfect, but it works in a pinch.
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Old 01-27-2019, 11:22 AM   #4
nikoror
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Awesome. Exactly what i was hoping for.

I thought about the same thing for the flange nut and it should be close, but was worried in case the flange thickness is slightly different


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Old 01-27-2019, 11:27 AM   #5
MrFabulous
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If you're building a spec car, eventually you will need to use that case for a limited slip. At that point the builder can verify the torque. That was my intent. I started with a manual car with the cv flange. Got a 3.46 off ebay and swapped flanges. Its working for now until I upgrade.
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