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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 05-06-2013, 11:13 PM   #1
330Cole
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Engine and Tranny mount Combinations- Can some be destructive?

So i was thinking about my engine and tranny mount situation. both sets are bone stock original on a 140k car. I want the improved gear-change accuracy of solid mounts all the way around, but am slighty turned off by the vibration and DD friendliness. Polyurethane bushings seem to be the best alternative, however i dont feel like vibration is such an issue regarding transmission mounts, while shifting precision is more effected in this area (i figure). Thus, my idea is that polyurethane engine mounts and solid tranny mounts would be the ideal setup. however, if i have stiffer mounts on my tranny than the motor, the engine will twist easier than the tranny, possibly damaging the whole tranny mount system (seeing that torsional stress would be passed down the driveline until it hit the solid T mounts which absorbed all the stress). just trying to figure out if this set up would be doomed for failure based on its physics.

any experience in this area would be greatly appreciated! or, similar educated input is encouraged.

Thanks in advance guys
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Old 05-07-2013, 08:00 PM   #2
TxZHP04
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If you're sensitive to vibration at all, you absolutely do NOT want solid engine or transmission mounts nor do you want bolt through poly mounts. I wouldn't really recommend poly engine mounts at all. If they're soft enough to have tolerable NVH characteristics, they'll eventually either melt or shear off. Your best bet is to install new OE m3 mounts, engine and transmission. You'll be amazed at how much difference a new set of mounts will make and the m3 mounts will be ever so slightly stiffer than your current setup would have been new. If you really must have something stiffer, the BimmerWorld solid rubber engine mounts are fantastic but do have increased NVH relative to stock mounts. This is what I run, paired with UUC street transmission mounts (the old black neoprene, not the newer poly), on my SC'd car. Last I saw though, the BW motor mounts were not available (although they seem to do periodic production runs).
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Old 05-10-2013, 11:57 PM   #3
330Cole
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Thank you for the info! I am most likely going with the m3 mounts. I don't want my car to vibrate to bits, and I trust OE more than aftermarket.

Thanks man!!!
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