Exhaust being fitted this week...
- Thread starter sixspeed
- Start date
Just thought I'd update this (Peppernick's post reminded me).
I did some dBa tests with a sound meter the other day (DavidM was enquiring about the levels in an email to me). Thought I'd post the results here. These are the same test techniques as most trackday organisers will use (although they only measure the sound at 2/3 revs, or 4000rpm in our cars)...
All levels measured on a cold system (the system does get marginally louder when it's hot and has been on track or a long motorway run etc), 0.5m and 45 degrees from the exhaust tips, A-weighted...
Idle - 86dBa
Static @ 4000rpm - 95dBa
So the system would pass for trackday use, which may surprise some of you who've only watched the video. The exhaust is very quiet on light/mid throttle, when cruising and holding speed for example... As such, as long as you build revs fairly smoothly, then you would always pass a static test with this system.
However, as you can hear on the videos, at full throttle, the system really opens up and let's you know what's happening!
So I tried another measurement with a full-throttle blip to the redline and back... result...?
108dBa... LOL
Ooooh, I love it
I did some dBa tests with a sound meter the other day (DavidM was enquiring about the levels in an email to me). Thought I'd post the results here. These are the same test techniques as most trackday organisers will use (although they only measure the sound at 2/3 revs, or 4000rpm in our cars)...
All levels measured on a cold system (the system does get marginally louder when it's hot and has been on track or a long motorway run etc), 0.5m and 45 degrees from the exhaust tips, A-weighted...
Idle - 86dBa
Static @ 4000rpm - 95dBa
So the system would pass for trackday use, which may surprise some of you who've only watched the video. The exhaust is very quiet on light/mid throttle, when cruising and holding speed for example... As such, as long as you build revs fairly smoothly, then you would always pass a static test with this system.
However, as you can hear on the videos, at full throttle, the system really opens up and let's you know what's happening!
So I tried another measurement with a full-throttle blip to the redline and back... result...?108dBa... LOL
Ooooh, I love it
This exhaust system sounds v tempting, esp if it will pass sound tests for track days! 
Was yours the first one H&S have done? How long did it take them to install?
Hi Carl - I've followed a slightly similar Jap-to-Brit-to-German route to you, after 2 years in a Honda S2000, then 3 years in a TVR Tamora, and like you, am also hoping the Z4M will be a slightly slower but more reliable TVR
Was yours the first one H&S have done? How long did it take them to install?
carl said:
Hi Carl - I've followed a slightly similar Jap-to-Brit-to-German route to you, after 2 years in a Honda S2000, then 3 years in a TVR Tamora, and like you, am also hoping the Z4M will be a slightly slower but more reliable TVR
AlexRWD said:This exhaust system sounds v tempting, esp if it will pass sound tests for track days!
Was yours the first one H&S have done? How long did it take them to install?
It was the first. It took them 4 days because of this. But they should be able to do it faster now I'd have thought? Your best bet is to give them a call though..