JBR engine mounts and vibrations / noise
 

I have 130,000 miles and just installed the JBR engine and transmission mounts. 70 duro.
I installed the 70 duro RMM when I bought the car several years ago.
The launches are awesome now... But the noise is insane. The only reasonable time is when it's idling with the clutch in.
Clutch out in neutral you hear the throw out bearing/ vibration. Noise was not super noticeable before.
Accelerating you hear the transmission (gear noise) and exhaust + vibration.
Cruzing on the freeway is steady gear noise/ vibration. Rear view mirror is almost useless, can't tell a white Corolla from a cop car.
Slowing down you get a couple of points in the RPM where it vibrates audibly.
My firewall is now a giant speaker.

I used a brand new torque wrench and it feels accurate. I re checked the passenger side mount and it was still tight. I loosened it and re tightened it with no change in the overall sound.
It is better after 1 week but I doubt it will get better from here.

Anyone have similar expierances? Any suggestions?

Info: original clutch and axles. Transmission oil changed 30 k ago with the plugs.(stock plug specs) 5k on the tires. Corksport intake(2)

JBR are usually very high vibes and NVH.

sent from my Nexus 6P

If you dont want vibrations switch to another stock passenger motor mount. Youll still have the tranny wine though

So, JBR is exaggerating when they say.

"Our 70 and 80 durometer mounts incorporate a bushing nearly 3" in diameter. The larger bushing and our proprietary polyurethane formula provide outstanding performance and durability without sacrificing comfort."

NVH?
So, most issues come from the passenger mount? I can put the OEM back on, it looks ok.

If you want less vibes with equal/improved performance.

You should switch to Damond Mounts.

sent from my Nexus 6P

I'm going to leave it alone for another week. Damon mounts look nice, sold out on the PMM. I saw 1 review comparing them to the JBR 80. Slightly less noise. But no comparison to the 70.
Any suggestions on getting the JBR mounts to break in?
Downshift while coming to a stop, quick shift?
My MPG will suffer next week.

Get something that won't fall apart.

https://www.google.com/search?sclien...msg=NCSR&noj=1

2 minutes on google tells you aftermarket PMM's will introduce a lot of vibes. You can get a oem style solid rubber PMM on the cheap and keep the TMM/RMM.

I have a Damond PMM and it barely increase the vibes.

sent from my Nexus 6P

Actually I read several reviews saying the JBR 70 duro set did not have bad vibes.
The JBR RMM was fine. But I will try to reinstall the PMM next week if it doesn't get better.

Coming from someone who had a set of 80d and 70d mounts and have driven in vehicles with 88... They were all the same.

The JBR mounts will break in and settle a bit after a while...mine took ~2000 miles (80/88 trilogy). The vibes were still pretty intense at certain RPMs, but not unbearable IMO. The transmission whine got pretty annoying after a while though. I didn't mind but so much as I expect a performance car to be loud and have some vibes. The performance gained was worth it to me. Plus, I have other vehicles I can drive, so it's not like I had to live with it for long trips or anything.

Honestly, a bit of research on here would tell you that JBR mounts are notorious for drastically increased NVH. At the time I purchased mine they were the best thing available. Now, however, it would've greatly benefited you to go with Damond Mounts. After coming from the JBRs my car now feels like a luxury car. Less vibes, no transmission whine at all, and less torque steer than before.

You can swap back in your PMM if you want, just know that you are on borrowed time with it seeing as you're at 130,000 miles...OEM PMMs are known to detonate without warning...

My firewall vibrates with the MD pmm too. Haven't been able to find where it is making the noise but at ~2750 rpm it's a very loud rattle.

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How do we know if this is the case of the mounts, or a case of the O.L.D.?

Yes. Yes they will.

All the dm nut swingers need to stop. Yes i think the mount is a bit better but it still vibes damn near just as much with similar noise too.

Broken.
This has happened to many MANY users.

Stripper transmission housing because the whole spacing isn't correct.

Not exactly sure where you see any nut swinging going on here. Just first hand experience being voiced by people, some of which have had both JBR and DM mounts. And of course the one VERY anti-JBR guy. He has his reasons for it too, justified in my eyes, but that's a different thread, or 50.

Either way, no real nut hugging going on here.

I understand that jbr has gone down hill and that his tmm sucks ass but it just seems lately its like dm or nothing.

I had there rmm and tbh it was the most nvh rmm i ever had. I went with cpe stage 2 as a replacement. I have the jbr pmm on my car for idk 3-4 years now and no issue at all.

I mean i get dm makes good products and i support them, i guess i just havent had a jbr part fail yet on me so i dont have the same hate.

Understood. Personally, I say the more opinions, the better. And frankly, I think every opinion about NVH is pretty damn useless since its hard to quantify in anyway and everyone has different levels of tolerance for it.

Just pointing out that there was no real nut swinging going on.

Yeah, your right my bad. I guess i was just talking shit.

Tbh idk how people want a racecar and for it to be quiet lol. If thats the case maybe go buy a m series.

Although my gf does say she misses the vibes from the dm rmm lol.

Lol, agreed.

There also are a lot of folks who buy side mounts with power goals that OEM mounts would accommodate just fine. Not everyone reads enough and just likes to buy new things though.

Haha of course. Right now i make about 320hp and the stock pmm would work just fine but its hard for me to go back to stock only for the reason of i hate the slop the motor has with it.

I haven't had a chance to compare DM to JBR, but I found the DM RMM and PMM unacceptable NVH-wise (performance was awesome though). With the cpe s2 RMM and Damond PMM it was close to acceptable (GF was OK with it). But I am fully satisfied with my results with CPE s2 RMM, CPE PMM 60duro, and the CS TMM insert I've had the whole time. However in my case yes it's at least partially O.L.D. In any case opinions vary a lot here depending on previous car background, individual preferences, and possibly even how your individual car reacts to different mount arrangements.

I figured nothing for it but to formulate a strategy and try things, modify if unacceptable, repeat until done. In my case I started with the hardest thing I thought I might be willing to handle NVH-wise and trusted durability and engineering-wise and went from there based on what I learned.

Maybe but CS TMM insert is inexpensive, and I wanted to switch PMM just to prevent the dreaded splooge. Plus after switching them the shifting felt another step better beyond what it did with just RMM. I did all my mount switching at stock power until my most recent switch, and I still thought switching or improving TMM/PMM was worthwhile.

Jbr has never been up the hill.
His designs have always been cheap, poorly executed knock offs of other's designs.

I went from the CS PMM back to stock (have a CPE stage 2 RMM) I have considered the Damond mount but couldn’t stand the vibes on the CS mount (which only seemed to occur between 2400-3000 rpm, right at cruising speed) the shift feel was great but the passenger impression was horrible and freeway cruising sucked... I think this will be the case with any ‘improved PMM' but am watching threads like this to see if any have actually achieved a useful PMM.

I'm on the same boat as you are.

I would be the first to say the CS mount is great, if you don’t care about vibes but mine isn’t a race car... ho hum.

Stock everywhere except for the the CP-E 60 RMM here. I have yet to be compelled for more reinforcements.

Mounts are all a matter of driving style and opinion at the end of the day IMHO (aside from the ones that are failing apart). I've had the e-focus mount which I believe is a complete waste of money, CP-E stage 2 rmm for about 3k miles which I believe was too 'vibey' and the DM RMM currently.

While I would agree that the DM RMM is a bit out of control during the break in, it's far less vibey than the CP-E Stage 2 for city driving. I can't remember what the CP-E felt like on the highway but I wouldn't be surprised if someone said it's got less vibes than the DM.

While we're all on the topic of these mounts. Anyone know the average durability of the bushings on these things? I've got my CP-E RMM on for at least 60,000miles.

You can never find the right thread when you need it. I was researching a ways back and made a decision back then based on what I saw with JBR. Now I find the feedback i needed.
The OEM mounts are just shitty when your on it and and especially when you hit anything uneven.
If you get NEW OEM are they a lot better? Do they just loosen up over time?
I think the JBR RMM is fine, it made a huge difference.

BTW, The JBR PMM Fit perfectly. No alignment issues. The TMM Top plate was a tough squeeze. but the bottom post/bracket fit perfectly. So if they had fit issues they have mostly corrected them.
They have gotten a lot better with time. Lets see what a few miles can do. I'm sure the Summer heat will help as well.

You were warned.

Obviously everyone's car responds differently to mods, but using my personal experience with both sets of mounts I have to disagree that the Damond Mounts vibrate or make as much noise as the JBRs.

I had zero problems with my JBR mounts. They provided the performance I wanted. And, as @blackms3_71; stated in another post in this thread, these cars are not luxury cars and some NVH is to be expected in a performance car. I agree with that 100%. I personally think it's ridiculous that people upgrade to a nearly solid motor mount and expect it to remain quiet and not vibrate.

I personally had a hard time believing that the Damond Mounts were anything better than my JBRs. Again, I had no problem with mine. Yes they rattled the shit out of all the plastic pieces of the dash. Yes they made a shit ton of transmission whine. But, I endured and actually liked it. Because racecar, ya know?

However, the more and more I read about Damond Mounts providing the following one key element prompted me to switch: Damond Mounts drastically increase the shifting feel. I never had a problem shifting before, but with the Damond Mounts shifting feels noticeably more precise and "solid" as opposed to the vague and "clunky" feeling I had before. I'm on the OEM shift weight with OEM knob on JBR short throw shifter (not short shift plate). My shifter set up did not change, I only changed the mounts. But holy crap it made a difference. And I waited a long time before posting any sort of review of the Damond Mounts just to make sure I wasn't experiencing a placebo effect.

Plus, on top of that, my vibrations in the cabin have decreased by like 90%. There used to be at least 8 or 9 individual rattles in my interior and now there is only one (stupid map light housing). The rattles never bothered me before, but it is nice that the car has quieted down some. Also, transmission whine is virtually gone with the Damond Mounts.

So again, we all experience things differently and all our cars are different, but the Damond Mounts are a drastic improvement over the JBRs for me personally. Not trying to be a nutswinger by any means, just trying to state my opinion after making the switch.

At the end of the day I'm still going to beat the piss out of my car driving it like it is meant to be driven regardless of what NVH I'm experiencing. Now I just get to do it with better feeling shifting :arms:

By the same token, having owned both it could easily be said that the concept for the Damond RMM and PMM came from CPE since I'm pretty sure they came first. Not that DM hasn't had some good additional ideas e.g. the standard bushings that are easily user-replaceable. Also the bushings being PU rather than rubber probably does give them a bit less variation due to ambient temperature. In the end, I could care less if a mount is a copy or not; I care that it has the balance of NVH and holding the engine and trans in place that works for me.

I find the CPE 60 PMM to be remarkably smooth. I'd call it useful. Then again the DM wasn't very far off from it either once broken in.

CPE stage 2 has less vibes than the DM. In particular it transmits less noise into the cabin, and it also doesn't transmit the 2.7-3k off-throttle vibration in the same way the DM does. The CP-E also doesn't have nearly the sort of throttle tip-in vibes you get with the DM, which was most of my vibes in city driving. I'm surprised you found the DM RMM less vibey than the CP-E Stage 2.

I still stand by by statement but I'll have to agree with you regarding off-throttle vibes.

With the CP-E stage 2 the idle vibes are what put me off. the DM is quite a bit better at idle and allows me to feel the clutch better taking off from first, the CP-E was vibe city until the clutch grabbed and I had a hard time feeling the catch point. I do however experience an increase in trans noise compared to the CP-E Stage 2 and while the shifts are a little more on point gears 1-3 are still quite notchy.

At this point, if I do anything it will be to buy a new OEM PMM. I just hope it's a bit stiffer than the old one. From there I will make a decision on the TMM.
I just drive too much to deal with a lot of excess noise/vibration, and don't chime in any BS unless you drive over 40 miles a day on the freeway with traffic... Up hill both ways.

More jbr tranny mounts have failed than stock mounts.

I think your CPE wasn't broken in or was loose with those idle vibes; mine is completely benign at idle and takeoff. However I think I will give you that clutch feel may have been a touch better on DM. That would have to be due to lower engine movement allowed though, because the hydraulic clutch shouldn't actually behave any differently unlike the shifter.

Haha, fucking whiner. I drive about 40 city miles a day, equally split mileage wise between freeway and surface, and with the traffic it seems like uphill both ways. I'm so allergic to traffic I manipulate my leaving times and watch Google Now so I can drive when things aren't too backed up. I'm lucky to have that flexibility. But there are lots of people around here that put us to shame on driving miles, for example btstarcher, pretty sure that dude drives a LOT.

Yeah, I'm running the CP-E 60 duro RMM, I've got to be close to 60,000miles now. You've got to break the mount in. The first 1,000miles or so, I was in full regret mode because I thought I've ruined the livability of the car. But man, once the mount settles down the vibrations and noises really level off.

Now, how long do these bushings last?

Probably not as long on v1 as on v2. I'd suggest to have a look at a v1 at least every 2yrs/30k. It's unfortunate that it's not as easy to inspect as a v2.

I can visually inspect the thing without taking it off right? (I don't remember, it's been a long time since I got underneath the car)

If you have a V1 (which I believe you do if you have a 60duro - the v2 doesn't come in multiple durometers) then you will pretty much have to remove it to inspect the bushing because the bushing is in the stock location which is sandwiched between two pieces of structural stamped steel.

Alright, then f*** it. The mount is either fine as it is or a new one is going in.

OP, if you have not done so already, raise your idle rpm +200 and see if that stops or reduces some of the shaking at red lights and in stop and go traffic.

You need an access port to change the idle. That's not quite in the budget right now.

~1000 Mile update. They are a lot better, but the vibration around 70-80 MPH are still an issue. Rear view mirror is a blur and you never know when CHP might cruse up behind you. Also when coming to a stop as RPM's drop to around 2750 it does s sudden major vibration through the dash. The noise through the transmission is a lot better, however, they need to go. The performance is awesome, but not for a daily driver.