CVCashmere
Well-Known Member
- Joined
- Mar 28, 2017
- Threads
- 99
- Messages
- 1,311
- Reaction score
- 681
- Location
- South Jersey
- First Name
- Carl
- Vehicle(s)
- 15 GT Vert w/Steeda lower brace, PP sways & susp
- Thread starter
- #1
Hello Fellow Verts
As you all know, convertibles with the top up are noisier than hardtops. The sound tube that is connected through the Helmholtz resonator “picks up specific sounds” from the air being fed through the air intake system tube to the MAF (mass airflow sensor) and emphasizes them. The sound tube adds an engine acceleration sound when the throttle is opened.
This physical fact was described by Professor Helmholtz in his 1862 book, “On the Sensations of Tone”.
Between the road noise and the sound tube, I was losing the sound of the exhaust…which I want to hear! BTW…before I describe my modification, note the picture of the 2 Helmholtz chambers; the larger one is from a 2015-17 GT, the smaller one from the 2018+ version. Perhaps Ford decided to scale back the sound and its ugly appearance?
I obtained an extra hose that leads into the Helmholtz resonator, bought a #4 rubber plug from the Ace Hardware Store, cut off the fatter end to fit into the hose, and filed it as needed. Then I lock open the large clamp, slipped in the plug into where the hose narrows, and superglued it so it would not get sucked out and wind up in the MAF.
Yes, I have lost much of the engine noise but now, the H-piped exhaust tone comes through clearer while the interior is quieter. BTW…this works equally well for GT coupes.
Thanks for looking.
CVCashmere
As you all know, convertibles with the top up are noisier than hardtops. The sound tube that is connected through the Helmholtz resonator “picks up specific sounds” from the air being fed through the air intake system tube to the MAF (mass airflow sensor) and emphasizes them. The sound tube adds an engine acceleration sound when the throttle is opened.
This physical fact was described by Professor Helmholtz in his 1862 book, “On the Sensations of Tone”.
Between the road noise and the sound tube, I was losing the sound of the exhaust…which I want to hear! BTW…before I describe my modification, note the picture of the 2 Helmholtz chambers; the larger one is from a 2015-17 GT, the smaller one from the 2018+ version. Perhaps Ford decided to scale back the sound and its ugly appearance?
I obtained an extra hose that leads into the Helmholtz resonator, bought a #4 rubber plug from the Ace Hardware Store, cut off the fatter end to fit into the hose, and filed it as needed. Then I lock open the large clamp, slipped in the plug into where the hose narrows, and superglued it so it would not get sucked out and wind up in the MAF.
Yes, I have lost much of the engine noise but now, the H-piped exhaust tone comes through clearer while the interior is quieter. BTW…this works equally well for GT coupes.
Thanks for looking.
CVCashmere
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