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Motor mount recommendations

JDee

Ancient Racer
1,262
1,123
Exp. Type
W2W Racing
Exp. Level
20+ Years
halfway between Mosport and Shannonville
I had Steeda mounts recommended to me as being good so I got a set. Turns out the fellow recommending them actually had BMR mounts installed, not Steeda. Last track day of the year at Mosport coming out of 5 onto the straight I got 3-6 shift, could not get 3-4 so had to park the car.

When I got it home and up on the lift I found the right side motor mount bolts were loose but I was suspicious it wasn't just loose bolts. On disassembly of the mounts today the mount material (both black and red bushings) is disintegrating and so it was collapsing. So obviously these mounts are not capable of taking heat, even with the heat shields in place.

So I'm looking at BMR now, but just wondering if anyone has any first hand experience with any other mounts for an S550 for road course work? Don't want to go to solid mounts yet though as the car still gets driven on the street to and from the track and occasionally to go somewhere.
 
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captdistraction

GrumpyRacer
1,781
1,318
Phoenix, Az
I ran the BMR mounts with poly inserts for a couple years and now solid mounts. The poly held up well, but I’ll say there wasn’t a huge increase in NVH to the aluminum pucks. If anything I thought it was slightly better outside some cabin vibration around 1500 (which was there before as well)

Those steeda mounts are fairly renowned for failing in the mode you specified. Though part of that is the heat and constant vibration against the poly pucks. Shielding it can help.

Even the BMR units will wear in heavy track use but ultimately from my experience last much better than steeda’s product.


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JDee

Ancient Racer
1,262
1,123
Exp. Type
W2W Racing
Exp. Level
20+ Years
halfway between Mosport and Shannonville
Thanks for the info Chris. Interesting about the NVH with the solid aluminum pucks. Perhaps that's the way to go, for the amount that it gets driven on the street now it probably makes sense to go that route. I have a ton of nvh already with black bushings through the driveline and suspension so a bit more from the engine won't likely be much of a concern.

It looks like Steeda is going to send me a new set of all black bushings which they say are more durable than the red ones. I'll give that one more try since the red one had failed much worse than the black one did and it's possible the damage to the black one was simply because the bottom red one failed. I'll be keeping a much closer eye on it though and if it acts up again then I'll bite the bullet and go to the BMR units with aluminum pucks.
 
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JDee

Ancient Racer
1,262
1,123
Exp. Type
W2W Racing
Exp. Level
20+ Years
halfway between Mosport and Shannonville
Just to update this, did a really minor track day with the Steeda black bushings only. I say minor because we only got 3 sessions on a wet track so not a lot of speed/G's/heat. Today getting ready to go to Mosport tomorrow I am checking bolts and I find the passenger side motor mount is loose again, took almost 3 rounds to get it tight. It was put in with blue loctite on the bolts. Time to try something else.
 

JDee

Ancient Racer
1,262
1,123
Exp. Type
W2W Racing
Exp. Level
20+ Years
halfway between Mosport and Shannonville
So a couple of years now on solid motor mounts? Interested in hearing how they've worked out... reliability, NVH, etc?
Nope. Couple of days. Unbelievable what solid mounts will produce for NVH, it is NVH on a nuclear scale. I seriously thought the car was going to shake to pieces!
I went with the black inserts, they allow a little movement but not much and while the NVH is a lot worse than red inserts it is nowhere near solid mounts. I should probably try the solids again now that the car is 99% track car only. But the blacks are still in good shape and doing a good job after 2 years of track days. I have them wrapped in heavy foil and I think that helps reflect heat exhaust off them for some period of time.
 
146
88
Exp. Type
HPDE
Exp. Level
3-5 Years
25 min. to 1½ hrs. from Sonoma (ugh... traffic!)
I've been experiencing NVH "creep" as I continue to make my car a more capable part-time track toy. Seems that over time I acclimate to each additional bump in NVH and I'd probably be surprised if I could go back to stock for a day just to compare. I'm at what I consider to be tolerable levels though and am still considering a few other mods that could add a bit more, but nuclear scale NVH? Thanks for the heads up, this one's off my list! I want to still be able to enjoy the occasional road trip or weekend outing with the wife too.
 

PaddyPrix

If breakin' parts is cool, consider me Miles Davis
393
485
Exp. Type
Time Attack
Exp. Level
Under 3 Years
San Diego
If you change your mind on solid mounts, the Watson Racing units are great.
Not trying to bring a thread from the dead, but 2 years later, still thinking the same? Curious about the durability with track use for a part that I'm thinking is more drag race orientated with our vastly different abuse profiles.
 
259
248
Exp. Type
W2W Racing
Exp. Level
20+ Years
Snowy North
BMR 90 durometer wrapped with thermal protection (tape, aluminized foil) are a safe starting point. Kelly at BMR is a soild resource.
 

ArizonaBOSS

Because racecar.
Moderator
8,540
2,370
Arizona, USA
Not trying to bring a thread from the dead, but 2 years later, still thinking the same? Curious about the durability with track use for a part that I'm thinking is more drag race orientated with our vastly different abuse profiles.
They have worked great. Only POSSIBLE caveat is that there is less vibration damping; I am thinking the failure of my kooks headers (collector spike ejected) may have been due to this. I had flex-bellows installed in the latest X-pipe I put on to help deal with this going forward.
 

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