DB testing ?

[Zephyr Speedshop]

How do you guys test your noise to make sure you're going to pass the track test?

I really keen to get the fury on track asap. (Few bits happening this month then should be good to go)

But I'm abit worried its too loud. And I don't trust my phone or the cheapy eBay testers.

I actually think it's louder from the intakes. It's got a 150mm x 700mm straight through silencer on. And part of the work this month is to fit an airbox over the trumpets.



Thanks

[brillomaster]

Well the best way is to pop to your local circuit when a trackday is on and get them to test it for you.

Alternatively, if you don't trust cheapo decibelometers, then buy an expensive one you do trust.

[E-bmw]

As above, the best way is to go to a track beforehand, but take it from me having bought one, the cheap ebay testers (at least the one I bought for about £11) was well within a db or 2.

[Zephyr Speedshop]

E-bmw said:

As above, the best way is to go to a track beforehand, but take it from me having bought one, the cheap ebay testers (at least the one I bought for about £11) was well within a db or 2.

Good wood is my nearest track. Still 40mins away.

Do you know which tester you got ? As that sounds good

Thanks

[brillomaster]

i think the problem is phone testing, they can't realistically handle much about 90db. but get a proper noise tester that is rated up to 130db and that'll be fine.

couple of named brand ones from draper, laser tools or RS for about £40.

[WombleCate]

A mid-priced DB tester will give you a good guide, but, nothing is foolproof beyond a no-limit day.

Each circuit has different levels, uses different machines, asks for different RPM, has different testers and it can change on a given day (atmospheric pressure/ temperature/ wind??).

I had an itch to take my 996 (non-standard pipes) on a track day, went to Goodwood before-hand where it tested at around 102db, so signed up for a 105db members morning.

On the day is tested at 108db (impossible) and they waved me on, didn't trigger a drive-by all day.

[E-bmw]

Zephyr Speedshop said:

E-bmw said:

As above, the best way is to go to a track beforehand, but take it from me having bought one, the cheap ebay testers (at least the one I bought for about £11) was well within a db or 2.

Do you know which tester you got ?

I cannot be 100% certain if it is the same one, but this looks so similar that I would guess that it is just a cosmetic external update of the one I bought.

https://www.ebay.co.uk/itm/355994640181

[Zephyr Speedshop]

WombleCate said:

A mid-priced DB tester will give you a good guide, but, nothing is foolproof beyond a no-limit day.

Each circuit has different levels, uses different machines, asks for different RPM, has different testers and it can change on a given day (atmospheric pressure/ temperature/ wind??).

I had an itch to take my 996 (non-standard pipes) on a track day, went to Goodwood before-hand where it tested at around 102db, so signed up for a 105db members morning.

On the day is tested at 108db (impossible) and they waved me on, didn't trigger a drive-by all day.

I know its not fool proof, i just don't wan to turn up to a day with no chance of it passing.

think im going to get, a cheaper one online, if you guys are having reasonable results thanks guys

[motco]

Make sure your engine and exhaust are at running temperature when the test is done. My Westfield would fail the 90dBA test with a cold exhaust but pass after a warm-up. Also, raise the revs gently rather than over-rev and then go down to the set speed.