Drone reduction trick
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From: Clinton Township MI
C7 of Year Finalist (track prepared) 2019
Drone reduction trick
I found a little trick for reducing the drone inside the cabin. I dynamatted the heat shield above the mufflers. The customer whose car we did this on has a dynamatted interior and he said the drone reduction from doing this was another step equal to the reduction when we dynamatted his interior. The combination has significantly reduced drone. Dynamat is resistant to heat up to 350 degrees. This shield is spaced a considerable distance away from the mufflers so it should be able to withstand the heat. Here is a pic.
Thread Starter
Premium Supporting Vendor
Joined: Oct 2005
Posts: 13,975
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From: Clinton Township MI
C7 of Year Finalist (track prepared) 2019
More feedback from the customer in the Z06 section
http://forums.corvetteforum.com/c6-z...ion-trick.html
Thread Starter
Premium Supporting Vendor
Joined: Oct 2005
Posts: 13,975
Likes: 980
From: Clinton Township MI
C7 of Year Finalist (track prepared) 2019
I think the better question is, can you get the muffler heat shield out without removing the mufflers? It's much easier to do this with the heat shield on a table. I would say that it is nearly impossible to do cleanly in the car. You also need to make sure the thoroughly clean the surface so the Dynamat sticks.
Instructor
Joined: Aug 2008
Posts: 216
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From: Windsor, CO
What about putting it on the upward side of the sheilds (between shield and body)? That would eliminate worries of it somehow contacting muffler.
I think the better question is, can you get the muffler heat shield out without removing the mufflers? It's much easier to do this with the heat shield on a table. I would say that it is nearly impossible to do cleanly in the car. You also need to make sure the thoroughly clean the surface so the Dynamat sticks.
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St. Jude Donor '08-'09
I did this as well and measured zero reduction in cabin sound level. I applied two layers of Dynomat to the heat shield.
FYI, I attached a SPL meter to the analog input of my HP Tuners interface and logged various driving conditions both before and after. Each test was within 2-3 db of each other.
No difference.
FYI, I attached a SPL meter to the analog input of my HP Tuners interface and logged various driving conditions both before and after. Each test was within 2-3 db of each other.
No difference.
Melting Slicks
Joined: Nov 2007
Posts: 3,365
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From: Oklahoma City
The mufflers probably get 150-200 degrees in street driving conditions. This shield is 4-12 inches (depending on where you're measuring from) from the mufflers. If it were to come loose it would fall out the back of the car due to the angle of the mufflers. We'll try it on this one and see how it does.
More feedback from the customer in the Z06 section
http://forums.corvetteforum.com/c6-z...ion-trick.html
More feedback from the customer in the Z06 section
http://forums.corvetteforum.com/c6-z...ion-trick.html
Once the plate is out, ten or fifteen minutes of work, tops.
Last edited by Leprkon; Jun 24, 2009 at 06:42 PM.
Drifting
Joined: May 2008
Posts: 1,621
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From: Petal Ms
St. Jude Donor '08-'11
I did this as well and measured zero reduction in cabin sound level. I applied two layers of Dynomat to the heat shield.
FYI, I attached a SPL meter to the analog input of my HP Tuners interface and logged various driving conditions both before and after. Each test was within 2-3 db of each other.
No difference.
FYI, I attached a SPL meter to the analog input of my HP Tuners interface and logged various driving conditions both before and after. Each test was within 2-3 db of each other.
No difference.
I thought about doing this when I just had my rear out, but I didn't have any on hand and was in a hurry to get it back together.
With my new 3.42 gears, it make the drone right at 55 (the speed limit where I drive most). I ended up making the transmission wait and shift into 4th and lock up the converter about 60
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St. Jude Donor '08-'09
But, isn't 3 db double the sound?
I thought about doing this when I just had my rear out, but I didn't have any on hand and was in a hurry to get it back together.
With my new 3.42 gears, it make the drone right at 55 (the speed limit where I drive most). I ended up making the transmission wait and shift into 4th and lock up the converter about 60
I thought about doing this when I just had my rear out, but I didn't have any on hand and was in a hurry to get it back together.
With my new 3.42 gears, it make the drone right at 55 (the speed limit where I drive most). I ended up making the transmission wait and shift into 4th and lock up the converter about 60
