Join Date: Nov 2013
Location: Jacksonville, FL
Thanked 174 Times in 103 Posts
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I tried the JBR rear torque mount when they first came out and it was unbarable. Engine vibrations were so harsh that interior panels were rattling loose. It was returned promptly. They labeled it as street use stiffness but it was clearly TRACK ONLY.
Either that or like I said, my engine was idling at 500-550rpm causing serious vibrations even stock.
I then went and injected the OEM mount with 3M window weld poly. I did this on two previous cars and loved it so did the same on the M3. Been driving with it ever since, so probably a good 40k Miles of abuse on it now and still nice and stiff.
I plan to upgrade to the CorkSport mount, since I now want it even stiffer due to pulling down more power and since the engine is tuned and idles at a steady 1k rpm now, I have no worries for engine vibrations and can even get a racing mount and probably won't feel it.
I wouldn't mind sending you my injected OEM mount so you can see how it feels to have the engine move less between shifts. For $25 worth of 3M poly at autozone, it's an extremely cheap way of upgrading the OEM mount. And since you have control over how much poly to inject, you can techincally work out how much is too much and get it just right... not to stiff yet hold the engine in place better then stock.
If your car isn't suffering from excessively low idling, getting a nice street mount won't be killer for you but if it will be vibrating too much even after it's well broken in after a few weeks, your answer is a tune and up the idle to where the engine won't be vibrating at all. I could have gone with like 850-900 or so rpm but choose 1k because it reminds me of my s2000 back in the day. Like I said, launching the car is much easier.
Tuning also has the benefit of more power and benefiting from any other mods you may have done like intake / exhaust / 93 octane or even e85 if you want.
I Love my Lil Zoom Zoom M3 if you can't tell. Hahahaha.