need to make it quieter!

[carl_w]

Some time ago I borrowed Nick'cc's ACT trackday silencers (yes, I've still got them). With a trackday coming up at my favourite track (Bedford Autodrome -- good for numpties as there's plenty of run-off, but stringent noise limits) I thought I'd do a bit of dB measurement. I have some sort of sports exhausts (I know not what) and the linked decat from joolz.

Before fitting the ACT silencers, I measured 119 dB(A) at 5,500 rpm.
After fitting them, I measured 104 db(A) at 5,500rpm.

So a useful 15 dB reduction, but I need to get down to 101 dB(A).

Also need to manage 87 dB(A) in the driveby test at 20m away -- might have to take a trip over to Bedford Autodrome to get measured.

[Toady1]

mmm...you could sell me your linked de-cats and put your cats back on? just my suggestion!lol!

[keithyboy]

Any reason you're taking the readings at 5500 rpm. I thought 4500 rpm was the more usual figure?

[alinton]

Put the standard back box back on!

[carl_w]

The Bedford Autodrome website says "3/4 of maximum revs" which I reckon is about 5250 or so. I suppose I could claim that max revs are 6000...

[jesfirth]

when asked what it revs to at tracks I always say Its a V* so about 5800. Its never failed yet

[kingskingdom]

Carl, can you mail me details of the track day. Would like to do my 1st day there due to the numpty run offs!