Trackday exhaust question regards 420R

[KelvinH]

Looking for advice regards the standard 420R exhaust and its ability to pass the noise test at trackdays please.

Thanks in advance.

[Jonathan Kay]

Quite a lot in the archives, on both inlets and exhausts.

Jonathan

[KelvinH]

Thanks for the info

[ScottR400D]

Never had a problem with my R400D with RBTBs and standard exhaust. 
 

[ChrisC]

A standard exhaust needs to pass IVA at 98db static, mine passed at 96db.  I believe brands may be a problem with drive-by, hence the trackday option, that said my 420R passed drive-by at Bedford, which is supposed to be the toughest.  I think it all depends on the location of the mics.

[7oaks]

Brands also fine with standard exhaust

[Knowlsey]

My 420R with RBTB and standard exhaust, passes at Brands Hatch every time (with bonnet cut out and foam filter).  Static reads 95/96 db at approx. 5,500 rpm. 

I also had no issues at Goodwood and Silverstone, but I did fail towards the end of a trackday at Donnington with a 99db drive by.  This was at the start of the Start/Finish straight, i believe this is where the mic is positioned!  So short shifted to 3rd sooner on the last hairpin and managed to get through the whole day!            

[Se7enBTCC]

I've had no issues with mine at Silverstone, Donington, Bedford and Brands. Thruxton and Croft both an issue. At Thruxton it was only a static test and someone told me to just say it's a new engine and I'm only revving to 3000 for the day, that got it through but not worth the stress of finding out.