Noise

[LazyRoss18]

Booked on first track day in the Nob in a few weeks time, noise limit is 102db static and 90db drive by. Standard 3R with custom exhaust (still has cats), I should be okay to pass this shouldn't I?

[arabian]

i would think so, if you have an i-pod you can download a decimeter for free or very cheaply. Not exactly the height of technicality but may give you an indication.

[RobP]

Difficult for anyone here to answer that! My car would definitely fail that - M400 with 6 yr old Roush exhaust and race cats. The car is used extensively on track and because most of the exhaust wadding has been blown out, it now reads 103dB static. If your car hasn't been tracked that much and the exhaust isn't too old I would guess it should be fine.

[Jarcy]

The various apps I tried on my Google Nexus gave readings in the range of 86 - 87 dBs (4,500rpm 0.5m 45 degs)
Seems a little low to me, but there again my car is not particularly loud. Haven't got to a track-side meter yet to compare.
Also tried an app on my son's ipod at it read 100 dB, which is hugely different, so one or other is way out.

[andygtt]

RobP said:

most of the exhaust wadding has been blown out, it now reads 103dB static.

easily fixed for under £400 by a guy I know locally to us... he's done a few roushe exhausts and a H&S

[RobP]

andygtt said:

RobP said:

most of the exhaust wadding has been blown out, it now reads 103dB static.

easily fixed for under £400 by a guy I know locally to us... he's done a few roushe exhausts and a H&S

Cheers Andy - am investigating re-packing vs new rear boxes. May well get back to you!

[LazyRoss18]

It doesn't sound that loud to be honest so would be surprised if it failed!

What does it redline at? Before he looks at the gauge and makes me rev it to 6k!

[andygtt]

RobP said:

andygtt said:

RobP said:

most of the exhaust wadding has been blown out, it now reads 103dB static.

easily fixed for under £400 by a guy I know locally to us... he's done a few roushe exhausts and a H&S

Cheers Andy - am investigating re-packing vs new rear boxes. May well get back to you!

tbh having cut a few up the roushe box's are not that great, the inners he puts in are titanium perf along with far better wadding, mine has done 15k on the single turbo and we took it apart to inspect and it hadnt lost any wadding and I/we get on all the track days noise wise


The stock cars rev to 6500rpm (although rev limiter is higher there is no power up there) so should be tested at around 4500rpm for 3/4 redline test.... if your marginal tell them it revs to 6k, but they may not believe you lol