01-26-2018, 05:48 PM
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#15 (permalink)
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A True Z Fanatic
Join Date: Apr 2017
Location: So. Commiefornia
Posts: 6,377
Drives: 2014 Nismo Gunmetal
Rep Power: 2684375
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Quote:
Originally Posted by TBatt
With all of the things I have done to my Z the exhaust system which so sweet at first had become a drone monster. From 2K-3K rpm, the exhaust would drone at highway speeds and get really loud during regular driving. I did some searching on the forum and saw an article about adding Helmholtz resonators to reduce the 130-160Hz noise by pressure wave cancellation. Well, I added them in and they DO REDUCE the drone.
They are quite simple in design but a bear to install. The fab shop I use came up with a solution that was way easier than T-ing off the exhaust tip area. The system clears everything under the car and the drone has been reduced by at least 50%.
The resonators are 28 inches long and 2.25 inches in diameter. All 304 stainless.
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Are those pre bent 45's or did your fab shop bend them. What degree?
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