Fancy Tech: How to Get Rid of Exhaust Drone, works great!

Trips · 07-29-2010, 10:43 PM

Quote:

Originally Posted by 370Zsteve

My Berk exhaust makes it's sweetest sound right at the RPMs you specify.

Berk ftw?

Holliday · 07-30-2010, 01:26 AM

Quote:

Originally Posted by Triple's

Play nice you two!

'10Anamoly · 07-30-2010, 10:28 AM

Quote:

If there is temperature change in the exhaust due to outside ambient temps the speed of sound will change and the wave length will also be affected.

Frequency=Speed of sound/Wave Length

This may be a non-issue if the exhaust temps are not affected much by the outside temps.

my 2 cents

This is true for the math, but the exhaust temps should be pretty similar despite outside temperatures. Perhaps a bit cooler in the winter but still pretty close. The side branch resonators cover about 15 points of frequency completely and then begin to lose a bit of efficiency. On my car it knocked out all the drone from 2200rpms through 3000rpms. I expect in winter for the car to make a bit more noise but probably not much. Can always report back when its cold outside.

Nikon FM · 07-31-2010, 10:47 AM

Quote:

Originally Posted by '10Anamoly

This is true for the math, but the exhaust temps should be pretty similar despite outside temperatures. Perhaps a bit cooler in the winter but still pretty close. The side branch resonators cover about 15 points of frequency completely and then begin to lose a bit of efficiency. On my car it knocked out all the drone from 2200rpms through 3000rpms. I expect in winter for the car to make a bit more noise but probably not much. Can always report back when its cold outside.

Sounds good. 15 points=how much bandwidth?

Nice job on the Helmholtz solution!

'10Anamoly · 07-31-2010, 06:19 PM

Sorry points was not very tech savvy, I meant 15hz. The frequencies from 115hz to 130hz seem pretty tame now, per Audacity on my PC when I did re-recording spectrum analysis reviews.

07-31-2010, 06:19 PM	#5 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 17	Sorry points was not very tech savvy, I meant 15hz. The frequencies from 115hz to 130hz seem pretty tame now, per Audacity on my PC when I did re-recording spectrum analysis reviews. cv129 likes this. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

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