Motordyne Dual Shockwave w/Ti Tips Pics/Soundclips
11-02-2009, 03:08 PM
#562
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Hey any drone issues when just cruising around 2.5k rpm. I was looking at the Injen SES but heard the drone is horrible on it. My friend has an apexi and I think it has quite a bit of drone.
11-02-2009, 04:54 PM
#564
I get some drone around 2.5 rpms (Gamma). It has REALLY gone down though after about 1500 miles. I have an 06 w/Bose, and if I set the volume to 15 with the bass at 4, I can't hear the drone, just to give you an idea of the loudness of it; but I actually kinda like it now that is has gone down.
I know Tony's new axleback sections eliminate either both high/low frequencies (kinda like his VQ), or just the low (bass) frequency.
I know Tony's new axleback sections eliminate either both high/low frequencies (kinda like his VQ), or just the low (bass) frequency.
11-08-2009, 05:12 PM
#565
I installed the Motordyne Gamma Exhaust over the weekend, thanks to SOLO-350Z for the sweet deal. The exhaust system bolted up nicely and the only difficult part was getting the sides to line up evenly on both sides.
Tips seem to protrude out almost 2 inches, even after I tried adjusting them. Might have to take a rubber mallet to try and push them further onto the pipe.
Titanium rolled tips are nice.
I know I need a drop.
Driving impressions:
The exhaust is louder than I thought it would be. When I first started the car, the exhaust roared with a rumble. Compared to the stock exhaust, the Gamma Exhaust has more of a growl to it.
Cruising between 2k-3k RPM, the exhaust drones. It's not that bad if the stereo is turned up a few notches. However, driving the car at WOT is where this exhaust really shines. Exhaust note is louder, and meaner with more bass.
http://www.youtube.com/watch?v=e_oWudIpkLo
I'll take better clips later this week since I didn't have much time over the weekend.
Overall, the exhaust is awesome. The build quality is top notch and the exhaust note has the right amount of intensity that retains the sound of the VQ engine.
Tips seem to protrude out almost 2 inches, even after I tried adjusting them. Might have to take a rubber mallet to try and push them further onto the pipe.
Titanium rolled tips are nice.
I know I need a drop.
Driving impressions:
The exhaust is louder than I thought it would be. When I first started the car, the exhaust roared with a rumble. Compared to the stock exhaust, the Gamma Exhaust has more of a growl to it.
Cruising between 2k-3k RPM, the exhaust drones. It's not that bad if the stereo is turned up a few notches. However, driving the car at WOT is where this exhaust really shines. Exhaust note is louder, and meaner with more bass.
http://www.youtube.com/watch?v=e_oWudIpkLo
I'll take better clips later this week since I didn't have much time over the weekend.
Overall, the exhaust is awesome. The build quality is top notch and the exhaust note has the right amount of intensity that retains the sound of the VQ engine.
11-08-2009, 08:43 PM
#567
Wait until you hear sound clips of Shockwave))) V2 axleback. All the loudness of Shockwave))) but with ZERO drone. It worked much better than expected.
It uses a sidebranch helmholtz resonator like the HKS exhaust, but rather than using a axial flow through muffler it uses the straight pipe of the Shockwave))). The only purpose of the sidebranch resonator is to notch out the drone. I hoped for a ~6 db reduction in drone but it went down at least 15db. In fact, I think the only sound the db level meter was reading was the baseline mid-high exhaust frequencies and general road noise. There really was no drone.
And there was another interesting effect. Although it is just as loud as the Shockwave))), from inside the car its surprisingly reasonable and streetable.
And this was tested on a TDX exhaust on a auto G35 with HFC's. The TDX on a auto with HFC's is by far the combination that is most susceptible to drone. ...This new axleback prototype completely killed it.
Today was a good day for exhaust testing. I'll get pictures uploaded shortly. This one will go into production for sure. No drone!
PS - This new axleback section has also been modified to allow for a greater range of adjustability of the tips.
It uses a sidebranch helmholtz resonator like the HKS exhaust, but rather than using a axial flow through muffler it uses the straight pipe of the Shockwave))). The only purpose of the sidebranch resonator is to notch out the drone. I hoped for a ~6 db reduction in drone but it went down at least 15db. In fact, I think the only sound the db level meter was reading was the baseline mid-high exhaust frequencies and general road noise. There really was no drone.
And there was another interesting effect. Although it is just as loud as the Shockwave))), from inside the car its surprisingly reasonable and streetable.
And this was tested on a TDX exhaust on a auto G35 with HFC's. The TDX on a auto with HFC's is by far the combination that is most susceptible to drone. ...This new axleback prototype completely killed it.
Today was a good day for exhaust testing. I'll get pictures uploaded shortly. This one will go into production for sure. No drone!
PS - This new axleback section has also been modified to allow for a greater range of adjustability of the tips.
11-09-2009, 08:03 AM
#569
It has been suggested that this first prototype be called Shockwave))) V2. What do you think?
Functionally, it has the same mid-range and high frequency sound and loudness as the Shockwave))) but the side branch resonator works as a high pass filter and it totally kills the drone.
In the picture below both types of Blue Ti tips are shown. Blue straight lip on the left. Blue rolled lip on the right.
Some people like them rolled. Some like them with the straight lip. You can have it either way.
Here are some more pictures of the same parts at different angles.
The parts shown above are prototypes that were built on my Z. The production version will be a lot cleaner than these.
The 06 6MT Z with stock cats and the regular Shockwave))) doesn't have a problem with drone. But the owner of the G35 below had HFC's connected to the TDX and he has a automatic transmission and it had bad drone. After these new axlebacks were installed the drone completely vanished. Gone. Drone problem solved!
I was reluctant to bring the 350Z TDX exhaust to the market until the drone problem could be solved. Now that is has been solved, I will move forward with the TDX for the 350.
Functionally, it has the same mid-range and high frequency sound and loudness as the Shockwave))) but the side branch resonator works as a high pass filter and it totally kills the drone.
In the picture below both types of Blue Ti tips are shown. Blue straight lip on the left. Blue rolled lip on the right.
Some people like them rolled. Some like them with the straight lip. You can have it either way.
Here are some more pictures of the same parts at different angles.
The parts shown above are prototypes that were built on my Z. The production version will be a lot cleaner than these.
The 06 6MT Z with stock cats and the regular Shockwave))) doesn't have a problem with drone. But the owner of the G35 below had HFC's connected to the TDX and he has a automatic transmission and it had bad drone. After these new axlebacks were installed the drone completely vanished. Gone. Drone problem solved!
I was reluctant to bring the 350Z TDX exhaust to the market until the drone problem could be solved. Now that is has been solved, I will move forward with the TDX for the 350.
Last edited by Hydrazine; 11-09-2009 at 08:05 AM.
Do you have a time line as to when you think the V2 will be for sale or is it too early to tell?
11-09-2009, 01:37 PM
#575
Raj,
When I built these, I had you in mind because you wanted it quiet. And these certainly meet that requirement. They are highflow but about as quiet as stock.
Are you still interested? After hearing the Shockwave))) V2 I began to wonder if you may actually want to go the V2 route.
------
Everyone,
What do you think? Do these fit your criteria?
These are highly drone resistant and quiet.
NOTE: ^ THESE MUFFLERS ARE WIFE AND G.F. APPROVED.^
.
When I built these, I had you in mind because you wanted it quiet. And these certainly meet that requirement. They are highflow but about as quiet as stock.
Are you still interested? After hearing the Shockwave))) V2 I began to wonder if you may actually want to go the V2 route.
------
Everyone,
What do you think? Do these fit your criteria?
These are highly drone resistant and quiet.
NOTE: ^ THESE MUFFLERS ARE WIFE AND G.F. APPROVED.^
.
Last edited by Hydrazine; 11-10-2009 at 05:19 AM.
