Well, temptation has hit me hard and I'm looking into doing a 24v conversion on my 325i. I don't have the budget in mind to do an S5x swap so I'm hoping for the middle ground and I'm on the hunt for an M52B28. I will likely end up doing the OBD1 conversion to simplify the process but I want to clarify a few things that I haven't found solid answers for in all my searching. I will be doing my best to hunt down an early e34 m50b25 setup to bolt onto the m52b28 block/head as it seems to solve a few issues in one shot. My primary goal in the swap is to have a significant increase in bottom end and midrange power, and I understand the m50 manifold will lose a bit of that. I believe I'll still be far ahead of the stock m20b25 for daily driving power so it should still be worth the effort.
- Which DME is used for an OBD1 conversion on an otherwise stock M52B28? Would I need a custom tune on a red label to treat it as a 2.8L?
- Are there any differences in VANOS in the later model M52's? I read somewhere that there are single vanos and dual vanos options, both of which require different manifolds.
- What is the stock flywheel on a B28? Would it be fine to use my e21, 12lb m20 flywheel or should I stick with something closer to stock? I would obviously like the engine to rev somewhat freely, but I don't want to sacrifice too much of the smoothness that comes with a larger powerplant's bottom end torque. I will likely be retaining the stock G260 and fabricating my own mount/shift linkage.
- How is the quality on the turner motorsport m50 manifold conversion kit?
Am I missing anything else important? The m50 swap is so well documented that it doesn't really concern me as much as the conversion from the obd2 to obd1 B28 portion.
- Which DME is used for an OBD1 conversion on an otherwise stock M52B28? Would I need a custom tune on a red label to treat it as a 2.8L?
- Are there any differences in VANOS in the later model M52's? I read somewhere that there are single vanos and dual vanos options, both of which require different manifolds.
- What is the stock flywheel on a B28? Would it be fine to use my e21, 12lb m20 flywheel or should I stick with something closer to stock? I would obviously like the engine to rev somewhat freely, but I don't want to sacrifice too much of the smoothness that comes with a larger powerplant's bottom end torque. I will likely be retaining the stock G260 and fabricating my own mount/shift linkage.
- How is the quality on the turner motorsport m50 manifold conversion kit?
Am I missing anything else important? The m50 swap is so well documented that it doesn't really concern me as much as the conversion from the obd2 to obd1 B28 portion.
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