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N54 Motor Mount Upgrade?
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01-28-2016, 12:46 PM | #67 | ||
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01-28-2016, 04:10 PM | #68 | ||
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01-31-2016, 11:04 AM | #69 |
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Picked up the car after installing the BFI stage 1 motor mounts and the E46 M3 trans mounts. All the drivetrain slack is gone, particular the jerkiness of the car at 1st and 2nd gear, (and I have an AT, the 6MT drivers will notice an even bigger improvement I bet)
Downside is that they do add fair amount of NVH, there is noticeable amount of vibration inside the cabin at idle and you will notice the weird harmonics at 900-1000rpm when you take off from a stoplight. And you will get quite a bit more induction sound from the engine to the cabin with these mounts, which might be a good thing if that's what you are looking for (sounds more like a NA engine in this case). Overall, the tradeoff for comfort not terribly bad, but if you are relatively sensitive to noise and vibration like me, these will certainly catch your attention. FYI, the noise does seem to die down a bit (like 20% decrease) after a few short drives from yesterday. Will see how these perform after some break in. But I would not recommend anything stiffer than these stage 1 mounts for street use daily driver.
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01-31-2016, 12:32 PM | #70 |
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Any reason why you went with these and not AD Engineering? I have read that after a few 1000s miles these types of mounts do break in and NVH is reduced a bit. Keep the thread updated after the breakup period.
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01-31-2016, 12:43 PM | #71 | |
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02-08-2016, 05:50 PM | #72 | |
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02-08-2016, 06:27 PM | #73 | ||
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02-09-2016, 11:40 AM | #74 | |
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Thanks for the review.
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02-09-2016, 02:16 PM | #76 |
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lol enough said...
trans mounts are cheap... and extremely easy to replace as well... motor mounts take a bit more work due to the lack of space to work with, but a competent shop who is familiar with N54 should be able to get it done in an hour or two.
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02-12-2016, 12:38 PM | #77 |
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For those who are interested, the BFI mounts do break in a bit after a few hundred miles of driving. The high frequency vibration has been reduced quite a bit at higher rpm, and the cabin has become noticeably quieter while cruising.
Still have the rather annoying harmonic at 700-900rpm when crawling around the parking lot in 2nd gear, but I guess it is mostly due to the engine load on the AT cars. 6mt guys shouldn't have any of these issue.
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02-12-2016, 12:49 PM | #78 | |
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02-12-2016, 12:50 PM | #79 |
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bro, read the posts... lol
two weeks and about 500 miles...
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03-08-2016, 11:45 PM | #80 |
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Just an update...
Took a quick peak at the engine bay today, looks like passenger side mount from BFI is kind of melting from the exhaust heat. The polymer insert inside the metal casing is being pouring out... Disappointing, considering this car hasn't even been driven all that much in the last month... Guess it is back to the stock and 335is mounts.
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03-09-2016, 08:20 AM | #81 | |
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03-09-2016, 08:26 AM | #82 | |
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03-09-2016, 08:33 AM | #83 | |
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Furthermore, wouldn't the rubber stock/oem/ or 335IS mounts also melt though since they're made of rubber?
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Last edited by J. Dub; 03-09-2016 at 10:46 AM.. |
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03-09-2016, 09:35 AM | #84 |
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03-09-2016, 10:22 AM | #85 | |
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335is mount it is for me
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03-09-2016, 11:15 AM | #86 | |
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I am just gonna replace the driver side with 335is one for now. But I will be asking for BFI for a refund on this. At $200 a piece, this is unacceptable. Will try to get a picture of the problem later today.
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03-09-2016, 11:29 AM | #88 | ||
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