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      09-19-2019, 01:32 PM   #1
BlackPhoenix
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What's up yall, hope this is in the right spot for this post.

My 2011 6MT E90 M3 is about to undergo some big upgrades, and I wanted to hear some of your experiences with any of these upgrades, mainly in terms of NVH/other issues. I recently got this car last December, after my 2011 VT650 E93 was totaled. So far it's undergone the following: Ohlins R/T, Dinan sway, AP Racing BBK, full aero/badges, Forgestar/295 PS4S, Corsa catback.

Here's what I have planned in a couple weeks:
Harrop SC, RKP(Challenge) Sport Xpipe, BayOptiks, Autosolutions SSK, solid subframe bushings, differential bushings, throttle actuators/other wear items.

Purpose: Car is currently my weekend/occ daily/roadtrip car and has not been to the track yet this year (will see COTA in November FTW). It will see more track time once I have work sorted out and finish my move. Goals are to keep extra NVH at a minimum, esp since it will be seeing a ton of roadtrips.

I'm pretty much settled on BW solid subframe bushings and Purple Powerflex bushings, with the thought of minimizing the diff whine that I read can happen at slow highway speeds (55-60mph). Def will need these to put down all that extra power. Not really interested in going to a much harder diff bushing, since this car will see regular roads as well. I'd prefer to hear the whine from the engine instead.

For those with AutoSSK and upgraded carrier and shifter bushings, what have you noticed in terms of gear noise/whine/vibration? Did you go with the stock bushings with the kit or elect for 80A, 95A upgrades? I got the OEM ones but considering the harder ones, likely 80A. Any annoying quirks like V/H in the stick shift? I'm electing for replacement of all the bushings here with OEM, but not sure since I'd like something more durable...

Sorry for the lengthy post, many thanks in advance for any advice!

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      09-19-2019, 04:37 PM   #2
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I had those on my last DCT and it was my favorite upgrade. I will do it on this car eventually as well. The whine wasn't really noticeable especially if you have a louder exhaust. I am either ripping it or have music on so the whine was basically non-existent.
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      09-19-2019, 06:11 PM   #3
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as long as you don't do hard diff bushings you are fine with the rest of the mods
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      09-19-2019, 07:35 PM   #4
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I have the SSK. You might feel a tiny bit more vibration in your hand but that's it.

Last edited by serranot; 09-19-2019 at 07:43 PM..
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      09-19-2019, 10:30 PM   #5
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im dct on solid subframe and purple diff, the whine only happens from 80km/h to 100km/h and it's a good type of whine i think you may actually enjoy it
i believe for a manual you can even go powerflex black and you should be fine
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      09-19-2019, 11:02 PM   #6
Dave07997S
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Quote:
Originally Posted by SYT_Shadow View Post
as long as you don't do hard diff bushings you are fine with the rest of the mods
Agreed the hard diffy bushings add a ton of nvh.

Dave
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      09-20-2019, 01:04 AM   #7
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Had to check my build sheet its been so long ago....

Powerflex front tension arm (thrust rod) bushing set
Powerflex high durometer rear subframe mount kit
Powerflex black series M3 differential mount kit

Zero issues with NVH on my 4.6L 6MT

Next set of mods Bimmerworld Tri-Y Headers, YCW Carbon Driveshaft, 4.10 Gears w/ Wavetrac LSD....Karbonius intake when it arrives.

Kudos on the Harrop bro, if I do another S65 will go that route for a change up.
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      09-20-2019, 10:02 AM   #8
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Quote:
Originally Posted by SYT_Shadow View Post
as long as you don't do hard diff bushings you are fine with the rest of the mods
Thank you, that's what I've read from other people's experiences...

Quote:
Originally Posted by serranot View Post
I have the SSK. You might feel a tiny bit more vibration in your hand but that's it.
Thanks did you

Quote:
Originally Posted by dozaiya View Post
im dct on solid subframe and purple diff, the whine only happens from 80km/h to 100km/h and it's a good type of whine i think you may actually enjoy it
i believe for a manual you can even go powerflex black and you should be fine
Awesome to hear, I'll start with purple and see how that goes I think.


Quote:
Originally Posted by Dave07997S View Post
Quote:
Originally Posted by SYT_Shadow View Post
as long as you don't do hard diff bushings you are fine with the rest of the mods
Agreed the hard diffy bushings add a ton of nvh.

Dave
Thanks Dave!

Quote:
Originally Posted by gte869h View Post
Had to check my build sheet its been so long ago....

Powerflex front tension arm (thrust rod) bushing set
Powerflex high durometer rear subframe mount kit
Powerflex black series M3 differential mount kit

Zero issues with NVH on my 4.6L 6MT

Next set of mods Bimmerworld Tri-Y Headers, YCW Carbon Driveshaft, 4.10 Gears w/ Wavetrac LSD....Karbonius intake when it arrives.

Kudos on the Harrop bro, if I do another S65 will go that route for a change up.
Wow sounds like a sick build! Im considering the front tension arms too while it's up on the rack. From what I've read, steering feels more precise. Any added steering wheel vibration from this setup?

Thanks again guys
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      09-20-2019, 10:16 AM   #9
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@BlackPhoenix look at the Germam Auto Solution monoballs. Best design and the best price.
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      10-05-2019, 06:05 PM   #10
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Sorry for delayed response, yes steering precise with the tension arm upgrade. No vibrations from the setup. But I have replaced worn front bearings and run race pads. The slightest slop or brake issues will come through the steering wheel.
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      10-13-2019, 05:04 PM   #11
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Quote:
Originally Posted by dozaiya View Post
im dct on solid subframe and purple diff, the whine only happens from 80km/h to 100km/h and it's a good type of whine i think you may actually enjoy it
i believe for a manual you can even go powerflex black and you should be fine
I have solid on subframe, CF driveshaft, and purple on diff. The whine is most noticeable between 75-82 mph in 7th gear. I'd say about ~10% increase in NVH. It's slightly annoying because it's highway cruising speed.

MPE, tear pipes, and intake noise can't really mask it at stable throttle during hwy cruising, so if you want peace, gotta turn up the audio.

Other NVH increase during normal street driving below 65 mph is hardly noticeable. There's noise, but it's a subtle, mechanical noise that's quite sporty.

Since these mods were installed together, I cannot single out the main culprit, but from what I'm reading, I believe it's the stiffer diff bushings.

By the way, since you're planning on tracking, you'll have an excuse to get aggressive tires. My RE-71's are pretty loud on most pavement. It used to annoy me vs. RE-11's which were very quiet. Now I don't mind them as much because it helps reduce the diff whine.
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      11-20-2019, 01:40 AM   #12
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I feel like the wine from the harrop is going to drown out any potential while from the diff.

I have solid diff bushings with subframe, CF driveshaft, and Ron's ssk with 95a bushings. It's all very manageable as daily.

Only experiment I reversed were AKG 95a trans mounts, those were insanely loud. Went with rev shift 80a Mounts and they're perfect.
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      11-20-2019, 04:20 PM   #13
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We went with solid subframe bushings and urethane diff bushings. The difference from the solid subframe bushings is unnoticeable. Solid diff bushings do cause some unwanted noise, while the urethane ones almost unnoticeably increase the sound levels. This provides the best of both worlds.
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      11-20-2019, 08:58 PM   #14
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Quote:
Originally Posted by shuggy View Post
Quote:
Originally Posted by dozaiya View Post
im dct on solid subframe and purple diff, the whine only happens from 80km/h to 100km/h and it's a good type of whine i think you may actually enjoy it
i believe for a manual you can even go powerflex black and you should be fine
I have solid on subframe, CF driveshaft, and purple on diff. The whine is most noticeable between 75-82 mph in 7th gear. I'd say about ~10% increase in NVH. It's slightly annoying because it's highway cruising speed.

MPE, tear pipes, and intake noise can't really mask it at stable throttle during hwy cruising, so if you want peace, gotta turn up the audio.

Other NVH increase during normal street driving below 65 mph is hardly noticeable. There's noise, but it's a subtle, mechanical noise that's quite sporty.

Since these mods were installed together, I cannot single out the main culprit, but from what I'm reading, I believe it's the stiffer diff bushings.

By the way, since you're planning on tracking, you'll have an excuse to get aggressive tires. My RE-71's are pretty loud on most pavement. It used to annoy me vs. RE-11's which were very quiet. Now I don't mind them as much because it helps reduce the diff whine.
Quote:
Originally Posted by DRLane View Post
I feel like the wine from the harrop is going to drown out any potential while from the diff.

I have solid diff bushings with subframe, CF driveshaft, and Ron's ssk with 95a bushings. It's all very manageable as daily.

Only experiment I reversed were AKG 95a trans mounts, those were insanely loud. Went with rev shift 80a Mounts and they're perfect.
Quote:
Originally Posted by BPMSport View Post
We went with solid subframe bushings and urethane diff bushings. The difference from the solid subframe bushings is unnoticeable. Solid diff bushings do cause some unwanted noise, while the urethane ones almost unnoticeably increase the sound levels. This provides the best of both worlds.

Thank you all for sharing your experiences. Just got the car back last week. Woah! What a difference!! Ended up with solid subframe, purple diffs, and OEM SSK bushings, rear trailing arms (to help with that extra power as was recommended to me) and GAS monoballs. The car def feels more planted and steering more precise. Shifting feel is much improved and precise, love it. Can't wait to get it on the track.

No noticeable V/H, but the whine, oh man, that Harrop is something else. Such a different character from the 650 kit on my last E93. Loving the low end torque. Beast. Mike and BPM, props for all the work you put towards this kit. Need to put much more time on it, but so far loving it. I'm sure Stage 2 will be even more of a hoot!
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      11-20-2019, 09:53 PM   #15
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So awesome!

I'd like to hear how the SC fairs on the track. I'll definitely be joining the Harrop club.

Also, videos would be most appreciated. There's a serious lack of Harrop e9x M videos...
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