The Lotus Cars Community banner

1 - 20 of 21 Posts

·
Premium Member
Joined
·
124 Posts
Discussion Starter #1
Anyone replace their rear engine mount only with the BOE one? What has been your experience? Are you experiencing too much vibration?
 

·
Premium Member
Joined
·
340 Posts
I think BOE is selling the Innovative mounts. I have them front/rear and don't feel it is a problem, but I'm not too picky. Rear only would be easy to change but I would be interested in doing the front mount as well.
 

·
Registered
Joined
·
2,247 Posts
Rear is like 50x easier to change so it wouldn't hurt to do just it first.

I changed front and rear from a different after market mount and they are way less vibration. I never had stock, but there is no way that I could characterize them as "too much" vibration.
 

·
Registered
Joined
·
2,105 Posts
I have the 75A rear only from BOE, and it's only mildly annoying at idle with AC on if you pay attention to it.
The first 1000 miles were bad with vibration starting around 800rpm to 2600 rpm, where it would resonate the aluminum chassis to the point where it's as louder than stock exhaust.

Car shifts nicer and drives better, though.
 

·
Registered
Joined
·
2,930 Posts
I have the 75A rear only from BOE, and it's only mildly annoying at idle with AC on if you pay attention to it.
The first 1000 miles were bad with vibration starting around 800rpm to 2600 rpm, where it would resonate the aluminum chassis to the point where it's as louder than stock exhaust.

Car shifts nicer and drives better, though.
+1
Rear only is the way to go.
 

·
Registered
Joined
·
176 Posts
I tried it, installed it and then took it out the next day. Horrible vibration and noise that would resonate throughout the chassis. To be fair, it wasn't in long enough to break in, but I had my doubts that even when broken in it wouldn't be acceptable, plus the agony of driving it to get it to the point. Perhaps it wouldn't be as bad with the top off? The shift feel and throttle response was wonderful, though.

I went to the poly inserts instead, no regrets. Primarily track car that gets driven to and from the track, if I trailered it, I'd do the poly mounts without question. Street use? No way.

However this all is subjective, and what is unacceptable to me may be no concern to the next guy.
 

·
Premium Member
Joined
·
124 Posts
Discussion Starter #7
I installed mine today. Everything I read about in the forums happened. Throttle response and shifting is markedly improved. The care has much more noise and vibration than before. Before it had none. Above 4000 RPM it is fine. At around 2600 RPM it sets up a resonance in the chassis. There is a vibration at idle. I am hoping these things will improve with time.
 

·
Registered
Joined
·
110 Posts
I installed mine today. Everything I read about in the forums happened. Throttle response and shifting is markedly improved. The care has much more noise and vibration than before. Before it had none. Above 4000 RPM it is fine. At around 2600 RPM it sets up a resonance in the chassis. There is a vibration at idle. I am hoping these things will improve with time.


I have just the rear mount from BOE. I talked to them about it and they recommended that I loosen all the bolts around the mount and start the engine, letting it idle for a little bit so that the mount can "settle". Also, they told me to rev the engine a few times and then fasten all the bolts. Currently, I have put about 700 miles on the car since then and the vibration is better. However, it can still be pretty loud around 2000 RPMs but nothing at Idle or at higher rpm's (4000+). I was also getting vibration from the under tray and diffuser. I installed some Dynamat on these which has helped.

The throttle response and shifting are so much better than with the stock rubber engine mounts. It is worth it for that alone IMO.




Sent from my iPad using Tapatalk
 

·
Registered
Joined
·
1,722 Posts
I put a few hundred miles on a couple different mounts to give them time to settle. As previously stated, shifting improves at the expense of NVH. I tried to convince myself that the trade-off was worth it, but since my car is 100% street I decided to go back to stock. If you track your car often then I believe the mounts are worth the annoying vibration at idle.
 

·
Older but getting faster
Joined
·
523 Posts
I have the BOE front and rear mounts.

More buzz, much better shifting response.

Worth the compromise to me, but I don't daily drive the car.
 

·
Registered
Joined
·
248 Posts
I have rear mount, the first few hundred miles were horrible. Now after 800-1000 miles the vibration has calmed and hopefully my exhaust will not crack again.
 

·
Registered
Joined
·
618 Posts
I have the rear and I didn't really notice much difference tbh. a little vibration at low rpms and maybe a bit at the 2500 rpm point (rear window vibrations/etc.). But really it kind of makes the car feel more like a proper sports car in a way ... but this is me coming from a pretty strung out fast caterham with no creature comforts (except a heater) so take that in mind.
 

·
Registered
Joined
·
392 Posts
Ordered my rear mount from BOE yesterday. A member with same exhaust, Arqray, said that his cracked due to too much engine movement and this would be the remedy to avoid future issues or repairs.
 

·
Sold my Exige S
Joined
·
930 Posts
Innovative mounts here. I put weatherstripping along the perimeter of the undertray years ago and have had no loud rattles or horrible vibrations that some of you describe. The diffuser can rattle too, but mine is quiet.
 

Attachments

·
Registered
Joined
·
2,036 Posts
Bumping this.

My intercooler duct cracked only one month after removing the rear poly inserts. Now I want to put them back in... but is there a softer unit than the Innovative? I remember hearing some have used just a half side of the insert, but that sounds like it would damage the stock rubber.

When I had my MR2 Turbo, Toyota had installed a LARGE rubber ballast weight on the subframe near the rear motor mount. That really helped with vibrations.
 

·
Registered
Joined
·
2,036 Posts
Why did the duct crack, is it hitting something? I've not had either side of the IC duct hit anything under any bushing condition
I am assuming it cracked because of the additional engine rocking.

To be honest, it happened after a pretty hard canyon run. I was really hard on the throttle and braking... when I got home I noticed an addition rattle at idle.

Kind of hard to tell from the picture, but it cracked where is goes into the slot.

Screenshot_20191110-160732_Video Player.jpg
 

·
Acme Super Moderator The Enforcer
Joined
·
6,644 Posts
I am assuming it cracked because of the additional engine rocking.

To be honest, it happened after a pretty hard canyon run. I was really hard on the throttle and braking... when I got home I noticed an addition rattle at idle.

Kind of hard to tell from the picture, but it cracked where is goes into the slot.

View attachment 1255136
Not sure that has anything to do with the mount(s). I've had front and rear hardened mounts for 8 years now with no ill effects.

San
 

·
Registered
Joined
·
2,036 Posts
Not sure that has anything to do with the mount(s). I've had front and rear hardened mounts for 8 years now with no ill effects.

San
Hi San,

Oh, I am not blaming the harder mounts, I am blaming the soft stock mounts for cracking the duct. The rubber boot had also slipped off... the engine must have really been rocking about.

I just reinstalled the rear inserts and went for a night time canyon run. The rattle from the cracked duct is mostly gone now, I just need to repair the crack. I also realized that age is affecting my night vision.... my lights suck!, or my bwm lights are just that good. Another thing I need to upgrade. Gah.

I'm glad I put the inserts back in. I was getting paranoid about this or that cracking, especially my Arqray Ti exhaust. They've been known to crack because of the engine rocking.
 

·
Acme Super Moderator The Enforcer
Joined
·
6,644 Posts
Hi San,

Oh, I am not blaming the harder mounts, I am blaming the soft stock mounts for cracking the duct. The rubber boot had also slipped off... the engine must have really been rocking about.

I just reinstalled the rear inserts and went for a night time canyon run. The rattle from the cracked duct is mostly gone now, I just need to repair the crack. I also realized that age is affecting my night vision.... my lights suck!, or my bwm lights are just that good. Another thing I need to upgrade. Gah.

I'm glad I put the inserts back in. I was getting paranoid about this or that cracking, especially my Arqray Ti exhaust. They've been known to crack because of the engine rocking.
That makes more sense.

San
 
1 - 20 of 21 Posts
Top