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11-04-2017, 09:00 PM | #67 | |
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11-04-2017, 09:25 PM | #68 |
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just to reflect back on my vibra technics mounts- when i had my rod bearings done they were in good shape.
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11-05-2017, 12:57 PM | #69 |
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11-06-2017, 06:42 PM | #70 |
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Group buy info here: http://www.m3post.com/forums/showpos...2&postcount=27
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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11-10-2017, 11:15 AM | #71 |
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Just installed a set of BW mounts and I don't find them offensive at all. Much less vibration than the Rogue poly mounts, and they will soften up a bit more unlike the poly. Happy with them.
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11-13-2017, 01:09 PM | #72 |
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I've been running the BW ones as well for a year and pretty happy with them. Barely noticeable over stock and only at idle. Everywhere else it's more immediate but never harsh.
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11-14-2017, 02:08 PM | #73 |
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I installed the BW mounts this weekend during my rod bearing install and find them seriously harsh. There is significant vibration and noise at idle and during clutch transitions (with DCT). I saw some comments about the torque on the top nut, is it possible I went too far?
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11-14-2017, 02:32 PM | #74 | |
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With a raised idle I would be hard pressed to notice the difference |
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11-15-2017, 11:19 AM | #75 | ||
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11-15-2017, 11:23 AM | #76 | |
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On my 6MT car I replaced with OEM as that's supposed to be a street car |
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12-15-2017, 05:36 AM | #77 |
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Has anyone tried (or thought about trying) solid engine and transmission mounts, e.g. something similar to these
https://www.turnermotorsport.com/p-1...ion-mount-set/ https://www.turnermotorsport.com/p-3...ion-mount-kit/ And the solid diff mounts: https://www.turnermotorsport.com/Sea...sedClearance=1 https://www.turnermotorsport.com/p-1...2-e9x-f22-f3x/ To suit an occasional street driven car with compromises for track use. Also on an auto/steptronic/DCT. Turner currently has these for 15% off - today is possibly the last day for the sale. |
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12-15-2017, 06:58 AM | #78 |
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Those look miserable. Major compromises. Definitely a track car only thing. If your only street driving is to the track and you don’t really care about NVH at idle and lower rpm where it is noticeable because you are never at idle or low rpm because race car then go ahead. Solid motor and trans mounts are really dedicated racecar parts.
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12-15-2017, 01:33 PM | #79 | |||||
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Street driving is a bit more than just to the track. I have solid RSFBs, which didn't increase NVH, and a solid diff brace, which added whine but it's not noticeable (to me) so I would think solid diff mounts won't increase NVH any further. It's the engine and trans mounts that I've been trying to find feedback on and I've included a few more comments from this thread. Street driving is generally in the 2000-4000 (or higher) RPM range. I'd expect noise at idle would be more noticeable but a raised idle may reduce/eliminate that. What range do you class as "low rpm"? I was also particularly interested in bigjae1976's comments that solid ending mounts should be fine for most street driving but it's the trans mounts that start to increase NVH, and also his feedback on the solid engine/trans mounts in his E46 M3 18 months later. I was also of the impression that engine and trans mounts solidity should be matched. |
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12-15-2017, 02:39 PM | #80 |
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Ask syt shadow since he has the Bimmerworld mounts on one car and new stock on another car. On my E36M3, I run Vorshlag 75D poly motor mounts with a 900 rpm idle speed and they are fine. On my E90M3 I tried Rogue motor mounts that are not as stiff as the Vorshlag and removed them because they added NVH that I considered objectionable but I did notice that if I held the idle at 800-900, they were fine. If you can get a custom tune with raised idle, I think stiffer mounts would be ok on the street. With the E36M3 I have tried a few trans mounts and found that I could not go as stiff on the trans mounts as on the motor mounts before NVH became intolerable for a driver, and I do run a higher idle speed on that car.
I recently bought some 80A trans mounts to try on the E90M3 and should have them on this weekend and will report how I like them. The stock trans mounts are really squishy even new ones, and that may be for a reason. I’ll find out soon. I don’t think engine and trans mounts solidity should be matched. I think trans mounts should be softer than engine mounts. Except on a race car. Don’t worry - you will know right away if it is too much. I have over modded cars before to the point where I don’t want to drive them as much. I try to avoid that now. |
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12-15-2017, 03:46 PM | #81 |
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Thanks! That's some really good information. It makes me think solid will be bearable on the street. Please post back your thoughts after you install the 80A trans mounts on your E90 M3.
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12-15-2017, 05:04 PM | #83 |
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I just picked up AKG 75D motor mounts and 95A transmission mounts and plan to install them in January. My car doesn't see much street time anymore though. To/from the office a few times a month to keep the battery charged and then to/from "local" tracks. Hoping my ~3 hour drive to COTA and a bit further to Cresson are still bearable, tbd.
If I was doing more street driving I would probably go Bimmerworld Group N or BFI StageII (85a) engine mounts and stock transmission mounts.
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12-15-2017, 09:30 PM | #84 | |
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12-18-2017, 08:49 AM | #85 |
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Did you end up installing the 80A trans mounts on your E90 on the weekend?
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12-18-2017, 09:02 AM | #86 |
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Yes and I don’t like them at all. Fine at idle and up to a little before 2000. Very noticeable vibration from 2000-3000. Tapers off after that but still there. Would be great for a track car or a car that is street driven only occasionally to the track. But one if those mods that takes a lot away from comfortable daily driving since you cannot avoid going through 2000-3000 rpm range repeatedly in daily driving.
I will remove them. I don’t think poly “breaks in.” I may first try retorquing them since sometimes too much torque on trans mounts adds vibration and just the right torque does not. |
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12-18-2017, 09:06 AM | #87 |
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Running motor mounts that vibrate at idle and trans mounts that vibrate off idle is a good way to ruin a street car. If you actually drive the car, the vibration gets old fast. If you just drive it for an hour on the weekends and pretend it’s a race car and you are adding a whole lot of performance because the car now vibrates, then I guess it does not matter. If you really have a track car that is street legal just to get you to the track then it is also OK.
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12-18-2017, 12:12 PM | #88 |
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Solid engine mounts aren't that bad. Lightweight flywheels are much worse. You get more exhaust noise.
My theory with solid trans mounts is the tranny is right under you so you're closer to the noise. If it were me, I would not get solid engine mounts if I didn't have another car to drive regularly. Otherwise, I'd do it unless you like to listen to the radio more than engine noise.
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