Impression of new SU Solid motor mount (Soft Bushing)

[Qtip]

Has anyone tried the new one-piece rear motor mounts from Street Unit? I am looking at the one with the soft bushing.

Curious how the vibrations are. I'm pretty much looking for the same level of vibration as stock.

I've tried the CP-e (new version with black rubber) and the two-piece SU mounts, both of which substantially increased the vibrations and had to be taken out.

[H3llfir3]

Any upgraded engine mount will transfer more vibrations into the cabin, its the nature of the beast. Did you give the mounts the recommended 100 mile break in period? Or did you start it up, say no thanks and took it out.

[JacksonMS30]

Providing you did give the recomended break in period for the mounts and the vibrations are still to much for you then you might try the corksport motormount inserts. I helped put these on a friends car and I didn't notice any vibration when I drove his car but then again, I don't drive his car everyday...

[Qtip]

Originally Posted by H3LLFiR3 Any upgraded engine mount will transfer more vibrations into the cabin, its the nature of the beast. Did you give the mounts the recommended 100 mile break in period? Or did you start it up, say no thanks and took it out.

I actually went further and gave them about 2000 before getting fed up with the vibrations and removing them. I would understand a tad bit more vibration but we are talking about a lot of vibrations with these aftermarket mounts.

Originally Posted by JacksonMS30 Providing you did give the recomended break in period for the mounts and the vibrations are still to much for you then you might try the corksport motormount inserts. I helped put these on a friends car and I didn't notice any vibration when I drove his car but then again, I don't drive his car everyday...

I also tried the Corksport insert and it too vibrated a lot, about the same as the SU mount I would say.

[Blackspeed]

Originally Posted by Qtip I actually went further and gave them about 2000 before getting fed up with the vibrations and removing them. I would understand a tad bit more vibration but we are talking about a lot of vibrations with these aftermarket mounts. I also tried the Corksport insert and it too vibrated a lot, about the same as the SU mount I would say.

WOW. If you think the SU and CS inserts have the same vibes, then I want to try the SU. I have the CS inserts and there were no vibrations at all after the first 100 miles.
If the inserts bothered you, then you need to sell the mazda and get a cadillac.

[JacksonMS30]

Did you torque the mount back to spec? I think it is 70-80 ft.bls.

Also, I read somewhere (I think it was corksports instructions but it might have been somewhere in the forum) that it is best to torque the mount to the frame first then torque the mount to the motor. I'm not sure how much of a difference this will make but its what I did and like I said, no vibrations...

[Qtip]

Originally Posted by Blackspeed WOW. If you think the SU and CS inserts have the same vibes, then I want to try the SU. I have the CS inserts and there were no vibrations at all after the first 100 miles. If the inserts bothered you, then you need to sell the mazda and get a cadillac.

Haha, I'm okay with a bit of vibrations but not a killer amount. I think it may be because I don't rev too high during take off and I find that these mount vibrate the most when the engine is around the 1000rpm mark.

Originally Posted by JacksonMS30 Did you torque the mount back to spec? I think it is 70-80 ft.bls. Also, I read somewhere (I think it was corksports instructions but it might have been somewhere in the forum) that it is best to torque the mount to the frame first then torque the mount to the motor. I'm not sure how much of a difference this will make but its what I did and like I said, no vibrations...

No they were not torque, the shop tighened down fully by an impact wrench.


Hoping to see some feedback about the new "Soft" bushing provided by SU though. Hopefully someone out there purchased it.

[Siclos]

i really am thinking about getting mounts...but how much do they really have launching?? cause really thats all there good for.

[BolvangaR]

I, too, would like the best performance with the least amount of vibrations. So, OP, is the new SU MM supposed to be harder or softer than the CP-E RMM?

[ooheadsoo]

Ouch, that doesn't sound good. This is my DD and in LA traffic, you can't launch at more than 1000-1500 RPM unless you're first at the light, and that's 99% of the time. I knew there was a reason I haven't installed my CP-e mount for over a year.

[nynhex]

Originally Posted by Qtip I actually went further and gave them about 2000 before getting fed up with the vibrations and removing them. I would understand a tad bit more vibration but we are talking about a lot of vibrations with these aftermarket mounts. I also tried the Corksport insert and it too vibrated a lot, about the same as the SU mount I would say.

Have you checked your side motor mounts? A soft stock RMM will absorb some of the vibration from a failing side mount. I've had the CS inserts on for 1000+ miles with little to no vibration at all. I maybe notice it at idle or when it's cold out.

I'm probably going to switch to the SU or CP-e RMM as I want something a bit more aggressive.

[banditscout]

Originally Posted by ooheadsoo Ouch, that doesn't sound good. This is my DD and in LA traffic, you can't launch at more than 1000-1500 RPM unless you're first at the light, and that's 99% of the time. I knew there was a reason I haven't installed my CP-e mount for over a year.

Sell it to me!!!

[Qtip]

Originally Posted by nynhex Have you checked your side motor mounts? A soft stock RMM will absorb some of the vibration from a failing side mount. I've had the CS inserts on for 1000+ miles with little to no vibration at all. I maybe notice it at idle or when it's cold out. I'm probably going to switch to the SU or CP-e RMM as I want something a bit more aggressive.

The side engine mounts visually look fine. I don't see any leakage or tears or anything.

Originally Posted by BolvangaR I, too, would like the best performance with the least amount of vibrations. So, OP, is the new SU MM supposed to be harder or softer than the CP-E RMM?

I have no idea, SU doesn't mention anything about the durameter rating of the Soft mount but I know that the SU Street mount has about the same vibrations as the CP-e mount, except that they each vibrate at a different rpm.

[BolvangaR]

Originally Posted by Qtip The side engine mounts visually look fine. I don't see any leakage or tears or anything. I have no idea, SU doesn't mention anything about the durameter rating of the Soft mount but I know that the SU Street mount has about the same vibrations as the CP-e mount, except that they each vibrate at a different rpm.

Ok, then I'm confused at which "new" mount you're talking about because the only two MS3 mounts I see on their website list the durameter rating.

[darth vader]

I think they list the duro of the *recommended* (street) bushing but not the optional soft on the new 1-piece mount.

[booya620]

I have the SU rear mm I think it's a 65. Anyway vibrations aren't that bad, the wife doesn't even complain. For noobs reading this post; this is your first upgrade! Don't neglect this mod. The first time Your engine hits the firewall doing a first to second shift you'll regret not installing this. Btw your motor has enough power stock to slam the wall.

[BolvangaR]

Originally Posted by booya620 I have the SU rear mm I think it's a 65. Anyway vibrations aren't that bad, the wife doesn't even complain.

That's what I'm mostly concerned about.... the wife... the RMM needs to be wife-approved.

[nynhex]

Originally Posted by BolvangaR That's what I'm mostly concerned about.... the wife... the RMM needs to be wife-approved.

Sounds like the wife needs to be RMM-Approved.

[ZoomZoomPSSH]

i've noticed they had updated their new rmm for a while now.

it is a 1 piece design similar to cp-e's. i assume the design help eliminate some vibes. i'd like to see how it compares to the cp-e mount seeing how the bushings are different material.

kinda undecided on which one to get. wanted cp-e for the longest but now leaning towards SU

[Qtip]

Originally Posted by ZoomZoomPSSH i've noticed they had updated their new rmm for a while now. it is a 1 piece design similar to cp-e's. i assume the design help eliminate some vibes. i'd like to see how it compares to the cp-e mount seeing how the bushings are different material. kinda undecided on which one to get. wanted cp-e for the longest but now leaning towards SU

I wasn't happy with the CP-e mount especially after everyone posted that there was 0 vibrations with the initial run (blue rubber) and then CP-e secretly changing to the harder black rubber.

I'll probably give this new SU mount with the soft bushing a try. The price is right and it's in stock.

[nynhex]

I ended up going with the SU RMM (Street bushing). It should be here Friday so I'll install and provide some feedback on this thread or another. I'm hoping it's stiffer than the CS inserts. I really like them, but my launches and shifts still suffer a bit. Probably some driver error as I'm still getting used to this car after 2 mo, but we'll see.

[ZoomZoomPSSH]

Originally Posted by nynhex I ended up going with the SU RMM (Street bushing). It should be here Friday so I'll install and provide some feedback on this thread or another. I'm hoping it's stiffer than the CS inserts. I really like them, but my launches and shifts still suffer a bit. Probably some driver error as I'm still getting used to this car after 2 mo, but we'll see.

let me know your impressions.

is is the v1 or v2 rmm? im assuming v2 since that was the subject. hopefully since the style is like cpe's it will cut down on the vibes in comparison to v1

i have a m3m etd and that helped alot with hop. eliminated it at first but now i believe the stock rmm is wearing down. wheel hop is still kept down just not as much as it supposed to. upgrade would be nice.

keep us posted

[08speed]

the vibes from these mounts cant be nearly as bad as the ptp mount with the solid aluminum insert haha. it bugged the hell out of me for a while but either im used to it now or the vibrations have gone down.

[BolvangaR]

Someone should e-mail them and ask about their "soft" bushing. I would, but it's late and I think I'm getting sick so I'm going to bed.

[08Anamoly]

Regarding the Corksport MM inserts, I can wholeheartedly second that there is ZERO noticeable vibrations with them. If you had a lot of vibes, you did not install them right or the mount is not installed right.

I did not have a lift and a torque wrench so I paid a local mechanic I know $20 to handle it. On the lift he took it out in about 5 sec, popped the inserts in (only go in one way), and reinstalled the mount, torquing everything to specs in the service manual. I have never had a problem with them and the added security of shifting response is nice (no more clunk on hard shifts).

Also, I had the mount bolt torque's checked last week actually and they all were still at spec, so no trouble with loosening/etc.

[prenedo]

Originally Posted by booya620 I have the SU rear mm I think it's a 65. Anyway vibrations aren't that bad, the wife doesn't even complain. For noobs reading this post; this is your first upgrade! Don't neglect this mod. The first time Your engine hits the firewall doing a first to second shift you'll regret not installing this. Btw your motor has enough power stock to slam the wall.

Definately first mod!!... If you can't handle the cpe/cs insert vibes, don't keep the car because your engine is going to fall out . These are the least viby of all the mounts out there. It's really not bad.... AT ALL!!! This has been covered before. And also for the noobs reading this post (I'm a noob too, so I speak to all of us), install is like fifteen minutes, if you can get under your car and got a torque wrench (harbor freight's pretty cheap, like 10 bucks). Props to dude finding a shop to do it for 20 bucks, that was probably the easiest 20 that mechanic has ever made, but cheaper than buying the tools if your not gonna use em again. OP, good luck with your car, you mentioned a shop; are you paying a mechanic to pop these mounts in and out each time???

[BolvangaR]

So, I e-mailed Mark at SU, here's what he said

"Soft is about 50-60 durometer. If you hold both bushings in your hand and squeeze them you can feel the difference. Street you can barely squeeze and soft you can easily squeeze."

[Qtip]

Originally Posted by BolvangaR So, I e-mailed Mark at SU, here's what he said "Soft is about 50-60 durometer. If you hold both bushings in your hand and squeeze them you can feel the difference. Street you can barely squeeze and soft you can easily squeeze."

Great, thanks for doing that. I'll order the soft one and give it a go.

[mituc]

I have the full SU engine mount kit on my car since this Monday. I ordered it with the soft bushing option but I have no idea what is soft in there. When at idle if the air conditioning compressor kicks in the whole car shakes that I can barely read the numbers on my dashdaq. My wife jumps off the car once I stop in the front of our house, letting the engine idle for 1-2 minutes is a hell now. Probably this is because of the rear mount.

Also, the noise is in general very annoying: if I drive in second and I keep the rev steady at 3000 it blows my years off. Not sure if this is because of the tranny mount or because of the rear mount.

I drove the car almost 300 miles and I think I had enough of it. The gear shifting is firm, the engine doesn't move much and the violent take-offs are better, but this is my daily ride and it is not that pleasant anymore for anything else than racing! I just wanted a better firmer car, not a rally car (this is also the reason I went for the soft bushings).
I'm going to do some more take-offs tomorrow and see if the mounts will break in even more. If they don't I'll just throw them away and put the stock mounts back on, after about 40k miles they are in a very good condition.

P.S.: I also ordered a spare bushing for the RMM and that one seemed to be softer than the already existing bushing on the rear mount. Now I wonder, maybe should I switch them? Crap, so much money threw away in the wind...

[BolvangaR]

^^^^^

Maybe you should take some off to see where you like the performance/vibe ration. Maybe the full kit wasn't such a smart idea. You said when the AC kicks on, the vibes are even more prevalent. Well, one method to help with that is to raise your idle a bit. Whatever you do, don't just throw them away! People will buy them....... and I personally would be interested in your RMM.

[Qtip]

Originally Posted by mituc I have the full SU engine mount kit on my car since this Monday. I ordered it with the soft bushing option but I have no idea what is soft in there. When at idle if the air conditioning compressor kicks in the whole car shakes that I can barely read the numbers on my dashdaq. My wife jumps off the car once I stop in the front of our house, letting the engine idle for 1-2 minutes is a hell now. Probably this is because of the rear mount. Also, the noise is in general very annoying: if I drive in second and I keep the rev steady at 3000 it blows my years off. Not sure if this is because of the tranny mount or because of the rear mount. I drove the car almost 300 miles and I think I had enough of it. The gear shifting is firm, the engine doesn't move much and the violent take-offs are better, but this is my daily ride and it is not that pleasant anymore for anything else than racing! I just wanted a better firmer car, not a rally car (this is also the reason I went for the soft bushings). I'm going to do some more take-offs tomorrow and see if the mounts will break in even more. If they don't I'll just throw them away and put the stock mounts back on, after about 40k miles they are in a very good condition. P.S.: I also ordered a spare bushing for the RMM and that one seemed to be softer than the already existing bushing on the rear mount. Now I wonder, maybe should I switch them? Crap, so much money threw away in the wind...

Wow, sounds like it's the side mounts that are causing the issue. The vibrations weren't this bad for me when I had the rear mount with the street bushing.

[Qtip]

I've ordered the soft mount, will report back with my observations in the next week or so.

[mituc]

Good for you!
I just removed the side mounts today and only with the rear mount (soft bushings) the car feels very good, and the vibrations are liveable with (they are noticeable only at idle when the air conditioning compressor starts, when I drive the car in reverse with the clutch not fully depressed and sometimes when I launch at low RPM in heavy traffic).

Of course, the car feels a bit weaker without the side mounts, buy I really don't care and right now I'm very happy that the RMM does what it was supposed to do, with a reasonable amount of vibrations. I think that the tranny mount was the one that was shredding my brains and blowing my years off.

And, of course, the chief inspector (wife) is now happy again after 2 days of heavy vibes

[cld12pk2go]

I agree that the CS inserts created zero extra vibes even at 650RPM idle. Of course, they barely helped anything either.

The TRZ poly mount made my entire car buzz/rattle below 1800 RPMs (fuck that).

My SU poly MM is a nice compromise. Just very subtle NVH below 800 RPMs. I just increased by idle to 900 RPMs and it is a non-issue.

[Qtip]

UPDATE: I received the engine mount from Street Unit the other day and installed it this morning. The install went okay except that the bolt that attaches the mount to the chassis was seized real good. The impact gun was no help and I nearly snapped my breaker bar trying to get it loosened. Luckily everything went fine and I made sure to torque it to 60 ft-lbs. I'll check the tightness next time I jack up the car.

I haven't driven the car yet but there is a slight rumble at start up. Very slight increase in vibrations at neutral and the engine mount has 0 miles on it so far.

Will report back once I get some miles on it.

[Qtip]

UPDATE #2:

I've put about 100miles on the mount so far and I think there is something wrong with it. When there is a moderate amount of engine movement, it feels as though the mount has some give before the "rubber action" kicks in. It was fine for the first 20 miles and then just started doing this. It makes a noise that I don't like in the cabin as well. I've tried out three different mounts (including the stock) and this is the first time I have experienced something like this.

I did a visual check of the bolts and everything looks okay. I'm going to pull the mount off tomorrow and verify that everything looks good.

The mount is awesome though. Very little vibration around the 1000rpm area and some weird thumping sometimes at idle. No increase in vibration with the A/C on, which is hard to believe.

Hopefully I can figure out my issue. I'm sure Street Unit will take care of me if the issue ends up being the mount itself.

[nynhex]

Originally Posted by Qtip UPDATE: I received the engine mount from Street Unit the other day and installed it this morning. The install went okay except that the bolt that attaches the mount to the chassis was seized real good. The impact gun was no help and I nearly snapped my breaker bar trying to get it loosened. Luckily everything went fine and I made sure to torque it to 60 ft-lbs. I'll check the tightness next time I jack up the car.

Check your TQ specs. Spec is 70lbs, not 60. Do not fuck with tolerances, especially with something like a MM. Get it back up and torque it to spec.

Originally Posted by Qtip UPDATE #2: I've put about 100miles on the mount so far and I think there is something wrong with it. When there is a moderate amount of engine movement, it feels as though the mount has some give before the "rubber action" kicks in. It was fine for the first 20 miles and then just started doing this. It makes a noise that I don't like in the cabin as well. I've tried out three different mounts (including the stock) and this is the first time I have experienced something like this. I did a visual check of the bolts and everything looks okay. I'm going to pull the mount off tomorrow and verify that everything looks good. The mount is awesome though. Very little vibration around the 1000rpm area and some weird thumping sometimes at idle. No increase in vibration with the A/C on, which is hard to believe. Hopefully I can figure out my issue. I'm sure Street Unit will take care of me if the issue ends up being the mount itself.

Definitely check your torque specs. If it's coming loose there's a potential for this sort of behavior. If you have the Street bushing, the ride will be a lot firmer. You're breaking it in also so it's going to take some time to do its thing.

Btw, the thumping you are hearing is probably a rough idle or possibly slight detonation but it's being amplified by the solid mount. If you notice your exhaust probably sounds a bit different too.

[Night Wolf]

I have the same mount with street bushing and so far I put around 150 miles on it. Vibrations are almost none, but if you look for them, you can hear them. Only thing I can hear is half to one second long metal to metal clatter when I start and shutoff engine. I torqued bolts to 70 ft/lbs of torque and I also used locktite to make sure it won't loosen up. Overall I love this mount, cause shifts are easier and I can feel more power to wheels.

[nynhex]

Originally Posted by donightwolfdo I have the same mount with street bushing and so far I put around 150 miles on it. Vibrations are almost none, but if you look for them, you can hear them. Only thing I can hear is half to one second long metal to metal clatter when I start and shutoff engine. I torqued bolts to 70 ft/lbs of torque and I also used locktite to make sure it won't loosen up. Overall I love this mount, cause shifts are easier and I can feel more power to wheels.

I have the SU Reinforced Billet mount with the Street bushing and I've noticed a mild vibration at <800rpm. It's a pretty good ride, launches hard, shifts are smoother. No problems so far and about 100mi on it. Looking back, I should have put some loctite on the threads but I'll probably do so when I check things out in a week or so when I can get on a lift.

[Night Wolf]

Originally Posted by nynhex I have the SU Reinforced Billet mount with the Street bushing and I've noticed a mild vibration at <800rpm. It's a pretty good ride, launches hard, shifts are smoother. No problems so far and about 100mi on it. Looking back, I should have put some loctite on the threads but I'll probably do so when I check things out in a week or so when I can get on a lift.

Yea, you should do it. Just in case. You have the same looking mount as CP-e mount, right? Do you hear some metal to metal clutter (louder than normal vibrations) while starting/shutting off car?