Thwack
Member
- Joined
- Feb 13, 2018
- Messages
- 70
- Reaction score
- 104
- Points
- 33
Hi All,
So this has been an idea ever since I disconnected the diverter valve hoses to get a bit of louder sound from them. My last turbo car had a Greddy Type S, and I loved the sound. Since I haven't really wanted to pay for 2 new BOV's plus adapter plates to get no real performance boost, I've had to make do with the stock DV's and open air filters, you can hear it, but it's not a good/ true BOV sound.
So I was on travel in a small town with not much to do so I cadded up a horn that would fit over the exhaust nipple of the stock DV, got back and got my hands on a 3d printer and made them in halves so i could check fitment on them, and tweak if necessary.
Good news is, I can still measure, they fit perfectly onto the nipple and the space.
The audio results are mixed, it's louder, but marginally so to me. My wife and son both swear it's significantly louder from outside, but I can barely tell the difference in the cabin, window down. YMMV.
I took some video with and without the horns installed, but you really can't tell the difference there, I think my phone normalizes the audio to make it all generally level, I may dig up a gopro to try it there. Next I'm going to try experimenting with holes and slots cut in, see if I can get a bit higher note to it (not quite the GFB whistle sound, but between there and stock). Still playing with it, it's been an entertaining little project to kick around. Open to any input or suggestions.
And since everyone always wants pics and video, here's version alpha.
Outer surface, half a horn,
Inner surface. The little horizontal channel is what grabs onto the barbs on the DV nipple.
Here's the piece in place, showing how it fits into place on the nipple.
Finally, the completed product, all 4 halves assembled in place, held on with a band clamp
And video (from the cell phone, hard to tell difference). This is with no horns, just the open DV:
https://photos.app.goo.gl/XifkTjyFmoQvKVfs5 (click the image itself to hear the sound)
And with the horns installed:
https://photos.app.goo.gl/1mA2pRzmsivMBXGU6 (click the image itself to hear the sound)
Hope you like it or at least find it interesting.
So this has been an idea ever since I disconnected the diverter valve hoses to get a bit of louder sound from them. My last turbo car had a Greddy Type S, and I loved the sound. Since I haven't really wanted to pay for 2 new BOV's plus adapter plates to get no real performance boost, I've had to make do with the stock DV's and open air filters, you can hear it, but it's not a good/ true BOV sound.
So I was on travel in a small town with not much to do so I cadded up a horn that would fit over the exhaust nipple of the stock DV, got back and got my hands on a 3d printer and made them in halves so i could check fitment on them, and tweak if necessary.
Good news is, I can still measure, they fit perfectly onto the nipple and the space.
The audio results are mixed, it's louder, but marginally so to me. My wife and son both swear it's significantly louder from outside, but I can barely tell the difference in the cabin, window down. YMMV.
I took some video with and without the horns installed, but you really can't tell the difference there, I think my phone normalizes the audio to make it all generally level, I may dig up a gopro to try it there. Next I'm going to try experimenting with holes and slots cut in, see if I can get a bit higher note to it (not quite the GFB whistle sound, but between there and stock). Still playing with it, it's been an entertaining little project to kick around. Open to any input or suggestions.
And since everyone always wants pics and video, here's version alpha.
Outer surface, half a horn,
Inner surface. The little horizontal channel is what grabs onto the barbs on the DV nipple.
Here's the piece in place, showing how it fits into place on the nipple.
Finally, the completed product, all 4 halves assembled in place, held on with a band clamp
And video (from the cell phone, hard to tell difference). This is with no horns, just the open DV:
https://photos.app.goo.gl/XifkTjyFmoQvKVfs5 (click the image itself to hear the sound)
And with the horns installed:
https://photos.app.goo.gl/1mA2pRzmsivMBXGU6 (click the image itself to hear the sound)
Hope you like it or at least find it interesting.
Last edited:
