Board logo

Snetterton noise issues
laptoprob - 22/8/13 at 08:45 PM

I'm about to book onto a trackday there and have never been. Can you tell me how strict the drive-by 92db limit is?

My car is v.noisey(105db static) and i'm concerened it will be a wasted trip.

INDY BIRD - 22/8/13 at 09:05 PM

Drive by not sure on but 105 static is just about there for snetterton, try to keep the revs lower then as they are strict on the 105 db static and do ask for 3/4 rpm but try to keep them lower,

Enjoy and hope it goes well nice track

dhutch - 23/8/13 at 03:48 AM

I have only done snett once, first track day I did.

Car tested at 109, second attempt a ramming the exhaust with wire wool (inside the straight thought pipe, now repacking it) got it down to 102 for the static. First run out, now power at all (unsurprisingly) then half way down the back straight it flew out, nothing said further all day.

Now I must say, im not a fan of rigging/blagging/cheating noise tests as they are they for a reason, and have since replaced the exhaust with one that now gives circa 100db however it may well still be ok.
Others may have more detailed or up to date information, but I was told the drive by meter is a the end of the pitlane, my exhaust in the rhs which would help for that, and I got of the power a few car lengths early.


Daniel

cliftyhanger - 23/8/13 at 07:06 AM

why not take a db killer that can be quickly popped in just in case?
Yes I know it also reduces power, but if it is the difference between going on track and not.......

Best solution is an improved silencer.

laptoprob - 23/8/13 at 07:22 AM

quote:
Originally posted by INDY BIRD
Drive by not sure on but 105 static is just about there for snetterton, try to keep the revs lower then as they are strict on the 105 db static and do ask for 3/4 rpm but try to keep them lower,

Enjoy and hope it goes well nice track


Cadwell is exactly the same and yes i do try to keep the revs lower to avoid the limit so i,m not over worried about this its more the drive-by one but thanks anyway.


quote:
Car tested at 109, second attempt a ramming the exhaust with wire wool (inside the straight thought pipe, now repacking it) got it down to 102 for the static. First run out, now power at all (unsurprisingly) then half way down the back straight it flew out, nothing said further all day.


Sounds like a day i had at Donnington many moons ago where we forgot to put filter socks on and it kept tripping the drive-by on the pit land so we put something over the trumpets to calm it down. Revved great stood still but as soon as we got on track it ran like a dog and made it to craner curves before getting towed back...day over

quote:
why not take a db killer that can be quickly popped in just in case?
Yes I know it also reduces power, but if it is the difference between going on track and not.......

Best solution is an improved silencer.


Db killer is my next step i think. Silencer is already a great quality Wunoff but i would benifit from a 7" i think.

Thanks for the replies chaps.

[Edited on 23/8/13 by laptoprob]

will121 - 23/8/13 at 05:02 PM

they are strict on static noise and also on making sure you giving it the correct rev's. however ive not known of many drive by enforcement, mine use to run very close to the static 105 limit but never had an issue with drive by. now have a different exhaust on and Tuesday was only 85dB!

i know of some that have done temporary baffles for the static then removed with no issues but a risk.
I personally would try do something to get below the static test first rather than fail it and draw attention to yourself

dhutch - 23/8/13 at 05:09 PM

quote:
Originally posted by will121... now have a different exhaust on and Tuesday was only 85dB!


What exhaust is that? I was trying to get below 86 with my new one a few years ago but didnt.


Daniel

will121 - 23/8/13 at 08:05 PM

quote:
Originally posted by dhutch
quote:
Originally posted by will121... now have a different exhaust on and Tuesday was only 85dB!


What exhaust is that? I was trying to get below 86 with my new one a few years ago but didnt.


Daniel


Sorry of no help it was on a trackday zetec fiesta, for info old exhaust was a 2.5 single silencer current is a 2" twin silencer with go great reduction in power apart from possible top revs

dhutch - 24/8/13 at 06:07 AM

quote:
Originally posted by will121
Sorry of no help it was on a trackday zetec fiesta....

Ah, fair do.

Mines a 2inch id 6inch od straight through exhaust, about as long as will fit, and its still far from quiet enough for even a 98db day really, certainly not a 90/88db day, although they where prepared to get me on track for the ppc in the park sessions.


Daniel