RG - Sweet as a nut

[JMH99]

Just got the Cerb back from Racing Green and I think they’ve given me a new car by mistake. The engine was already as sweet as a nut so needed nothing more than some fresh oil. However, I was having some problems with squeaky brakes and had tried all the PH remedies. As good as they were, it turnout out I had a warped disc and the wrong compound on the rear pads, so no amount of copper slip would have made any difference. Anyway now sorted with new discs and pads and I don’t feel the need to avoid braking – which is a good thing. They also balanced the wheels on their new machine – and what a difference, the drive feels very solid and so positive. So a great day on Saturday, with a lovely run down to Goodwood to sort out the Revival tickets (don’t tell my wife you can order by phone) and caught up with a track day in progress. Haven’t quite decided whether to give it a go on the track or not (in any case if I do, I need to change insurance company) but as I was there I got the db reading - what is the road noise limit and how effective are these tail-end boxes you can apply for track days to get below their various limits?


>>> Edited by JMH99 on Monday 19th April 23:44

[jmh99]

Any comments on the db question. Like to know what's legal before I post the results from my Goodwood test

[beemer]

Noise limits generally vary by circuit - I know that Goodwood is particularly strict at 98db for some days (due to local council agreement or something), 105db for others.

Others vary between 101db and 105db - which is no help at all if you have a Cerb with sports pipes - my 4.5 was measured at 109db at Goodwood a month or so ago (although I'm sure the guy measuring was a bit over zealous with his probe - virtually had it stuck inside the tail pipe! Aren't they supposed to take the measurement 50cm from the rear of the car?). Guess it would be even worse with a de-cat...

think the ACT mufflers take off about 5db, but don't quote me on that...

Cheers
sean

[jmh99]

Thanks Beemer, mine got measured at 108 db, so may be the ACT mufflers will do enough to get under the 105 limit, at least. I would love to have a go at Goodwood as it is such a great track.