Miata Mailing List: December 1997, Message #59
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From: 	"rdoherty" <rdoherty@hsc.vcu.edu>

Subject: Dynamat vs 3200 RPM resonance

Date: 	Mon, 1 Dec 1997 13:23:41 +0000



Hello List --



This weekend I was inspired by the list to Dynamat the door in my 92

with a custom exhaust.  After applying two 6 inch wide strips to the

exterior sheet metal of each door and filling the each doors structural

beam with spray-in foam, I found a unexpected benefit.  When I took the

car for a trip on the highway the 3200 RPM resonance of my custon

exhaust was nearly gone.  I could actually easily hear the stereo at

highway cruising speeds.  The only hint of the remaining drone was

coming directly from behind the seats -- hopefully some judicious

application of Dynamat to the floor of the trunk or firewall will kill

that as well.



FYI, the interior of the door was fairly easy to access without removing

all of the tar and the moisture barrier.  I was able to get away with

only releasing the bottom half of the plastic sheet from the door and

folding it up with a piece of masking tape to keep it out of the way.  I

don't think that completely removing the sheet would allow enough extra

access to the door interior to make the hassle worthwhile.



The entire project took around 90 minutes start to finish and the stereo

sounds great as well.  







Regards, 



Don





--

R. Donald Doherty, Jr., MD

Department of Diagnostic Radiology

Medical College of Virginia

rdoherty@hsc.vcu.edu

http://griffin.vcu.edu/~rdoherty/rdoherty.html