Discussion in 'Fiesta ST Chassis Upgrades' started by ooklathemok, Dec 22, 2014.
Anyone installed a Boomba rear motor mount? Opinions?
I have. At first the vibrations in the low rpm where quite noticeable. However, after 1000 miles mine broke in and the vibrations feel non-existent. Also Wheel Hop is gone.
So I finally installed it. Installation was a breeze. Started her up and the vibrations were quite loud and very noticeable in my opinion. The whole car was vibrating, windows, doors, dash, plastic etc... I'm hearing all kind of sounds I can't even put my finger on. I thought I did something wrong in the installation. The extra vibrations were noticeable at idle, low/high rpms and spirited accelerations. Every passenger I've had so far has asked me if there was something wrong with my car. I called Boomba and they said it was normal and to give it 300 miles or so. I'm at about 150 miles now and it's hardly subsided. The benefits are there. I don't notice any wheel hop and the traction seems improved. I haven't given up on it yet. But right now the performance benefit is not worth the annoyance trade off. I'm also getting worried about any damage these harsh vibrations are doing to the car. I've noticed some distortion/reverberation in my passenger speaker intermittently. Let's see what a few hundred more miles of break in will do. Fingers crossed.
That's good feedback - thank you. I've been debating the Cobb vs. Boomba and it seems the Cobb may be better suited for me (and my wife that I carpool with in the FiST 5 days a week )
ooklathemok, please keep us posted since your concerns are the same ones I have. I'm interested in the boomba raw aluminum one since it appears to be the one that looks closest to stock.
Your reasoning for wanting the Boomba is similar to mine. I would love to hear some updates at 500 & 1000 miles.
I am sorry.
I have the Custom Performance Engineering Mount on my FiST with 2000 miles on the mount. I would probably place it just above the Cobb's stiffness, but not as harsh as the Boomba. My review on it: At cold start idle, you hear and notice it much more than stock. At normal idle, it is noticeable, but does not vibrate the car apart. Once everything is at operating temperature, the mount settles in. It is only noticeable between idle and 1500-1750 rpm. At higher RPM's, you don't feel or notice it.
In the heat of summer, I am assuming these mounts will be a bit softer with warmer temps. Mine was installed in November.
Ha - makes it a little tricky mod-wise.
Summer tires in 20 deg temps=smoke and tire hop...I am now on a mission to install the Boomba rmm and the Motegi's with the all season Mich Pilot Sport's...thanks admin's
Does anyone have any updates
I've been driving my truck more lately because of the snow and the fact that I haven't purchased winter/all season tires (the OE tires are fucking worthless in the snow!). But I have over 500 miles on the rmm. All the scary nvh are gone. It's almost stock from 1-2-3-4. I still notice some nvh in 5-6, but once I hit cruising speed it's gone. If I'm in too high of a gear I definitely feel a bit more nvh. So far it's a keeper. I'll update in another 500 miles.
Thanks for the update! I just placed my order. Looking forward to getting this installed since the 1-2 shift BANG is annoying!
So now I'm about 600-650 miles. All the excessive nvh that I was concerned about has magically disappeared one morning. While I wouldn't say it's stock now, I will say it's pretty close. I don't notice any scary rattling, noise, vibrations or humming as I did before 250-300 miles. Maybe it's in my head but I do hear a little nvh that I think I haven't heard before prior to the rmm installation. It's minuscule at best. It doesn't annoy me. I can live with it. I will say that if you're in the wrong gear the noise is much more amplified with this rmm than the stock one. I'm glad I hung in there.
Would temperature have something to do with it?
I thought about that. I thought with the warmer weather the urethane would break in much faster. But it's been the coldest february in Chicago. Boomba suggested to just drive and rail through the gears which is exactly what I did. I also read somewhere that the car should be jacked up level when installing. I did not do this initially. I just jacked up the driver side and installed the rmm. After reading that I thought that could be one of the causes of harsh nvh. I asked Boomba and they said it did not need to be jacked up level. As concerned as I was I went back and jacked the car up level and re-installed the rmm. I also added a little bit of grease to the moving metal faces that came in contact with one another. I did not apply any grease to the threads. I don't know if this had anything to do with the reduction in nvh, but alot of the nvh subsided when I re-installed the rmm and with more normal and spirited driving.
I've heard horror stories that the Cobb is quicker to break in and after about 10k miles it's needing a replacement. I just installed my Boomba one, and I'm getting the same rattling, un-piecing feel of my car. But all the other performance perks are gone. Wheel hop is gone, the "knocking engine" doesn't happen, and I get the quick chirp of the tires, straight off the line when I use LC. It's amazing, I don't care about the excessive NVH, as I'm currently the only one driving my car. But I know Boomba felt really solid in my hands and I even got complements on it.
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