Loud and proud!
Discussion
Taking the Cerb to Bedford for a track day next month where the noise limit is 101db. My car is de-catted with sports exhausts, and just bought a pair of these http://www.tvrcarparts.com/pages/partdetail.asp?id... to hopefully get through the tests. Does anyone have a similar setup and know what sort of level I can expect, and also how strict Bedford Autodrome is?
Very, very, very strict!
Find someone with a dB meter to check before hand as it'll be expensive day when you can't get 'out'
BTW: The chance of you getting anywhere near 101dB with decat and sports box with those things shoved up the exhaust are, IMHO, 0%!
Tim
PS: They measure drive by levels as well at Bedford
Find someone with a dB meter to check before hand as it'll be expensive day when you can't get 'out'
BTW: The chance of you getting anywhere near 101dB with decat and sports box with those things shoved up the exhaust are, IMHO, 0%!
Tim
PS: They measure drive by levels as well at Bedford
Edited by TT Tim on Tuesday 26th January 14:36
They made negligible difference on my decat/sports setup. Dropped it by 3-5dB at the most. Mine was putting out 131dB at 4500 rpm at the time.
I have proper clamp on extension cans which did do the trick untill I changed to a standard back box. At 101dB limit even they might be touch and go!
If you want to borrow the cans for your track day, I am in Bromley - drop me a PM
I have proper clamp on extension cans which did do the trick untill I changed to a standard back box. At 101dB limit even they might be touch and go!
If you want to borrow the cans for your track day, I am in Bromley - drop me a PM
high52kojak said:
Hey,
anyone know what the noise limit is at Nurburgring? I am also running de-cats with sports exhaust.
not been myself but my neighbour goes 3-4 times a year and he says its all about your attitude and where you park for the test. if you turn up at the gates being brash and noisey revving your engine and being an idiot they will make things hard for you, also try avoiding get up against the wall as this will make you sound louder and draw attention to you. anyone know what the noise limit is at Nurburgring? I am also running de-cats with sports exhaust.
I have the ACT SJ10-C45 full system with the tail end silencers. 6 silencers in all.
Sounds superb to be honest, having stood behind as the car was driven away.
No way near as loud as I thought, maybe because it is a nice deep sound??
But at only 4000rpm it measures >105db 1 metre 45 degree angle away above and between the two pipes, so think I will need the cat-silencers for track day stuff.
Sounds superb to be honest, having stood behind as the car was driven away.
No way near as loud as I thought, maybe because it is a nice deep sound??
But at only 4000rpm it measures >105db 1 metre 45 degree angle away above and between the two pipes, so think I will need the cat-silencers for track day stuff.
VPower said:
I have the ACT SJ10-C45 full system with the tail end silencers. 6 silencers in all.
Sounds superb to be honest, having stood behind as the car was driven away.
No way near as loud as I thought, maybe because it is a nice deep sound??
But at only 4000rpm it measures >105db 1 metre 45 degree angle away above and between the two pipes, so think I will need the cat-silencers for track day stuff.
Oh dear, I have the same system as yours and was indending to do some track days/quarters this year, I know Elvington and Woodbridge have a 103dB Limit (C weighted) for NA engines, looks like I'll have bribe someone Sounds superb to be honest, having stood behind as the car was driven away.
No way near as loud as I thought, maybe because it is a nice deep sound??
But at only 4000rpm it measures >105db 1 metre 45 degree angle away above and between the two pipes, so think I will need the cat-silencers for track day stuff.
Do you have a sound clip of the ACT's ? I only ask as I haven't fitted mine yet
Those ACT's look amazing!
On my 4.2 with a standard back box and decats was 98.6 dB at Bedford in December (101dB limit) and the guys were shaking their heads when it was testing.
Going back there on Saturday with no changes but the limit is 100dB and its going to be cold. I am a bit worried to be honest, as long as I can get on the track it will be fine, no where near 87dB on the drive bys.
HTH's
On my 4.2 with a standard back box and decats was 98.6 dB at Bedford in December (101dB limit) and the guys were shaking their heads when it was testing.
Going back there on Saturday with no changes but the limit is 100dB and its going to be cold. I am a bit worried to be honest, as long as I can get on the track it will be fine, no where near 87dB on the drive bys.
HTH's
Toadusmodus said:
Taking the Cerb to Bedford for a track day next month where the noise limit is 101db. My car is de-catted with sports exhausts, and just bought a pair of these http://www.tvrcarparts.com/pages/partdetail.asp?id... to hopefully get through the tests. Does anyone have a similar setup and know what sort of level I can expect, and also how strict Bedford Autodrome is?
Just been reading this thread - may be of interest....http://www.pistonheads.co.uk/gassing/topic.asp?h=0...
Enjoy if you get through
TT Tim said:
When will all you guys learn?
The Cerb is a V8 and therefore only revs to 5,750 rpm, just like the RV8.
If you all remember that you may find it a lot easier to pass noise testing, as readings are taken at 3/4 of max revs!!!!!!!!
Tim
Also they have massive valve overlap, so at 3-4000 rpm they will pop and bang under no load. This will drastically increase the volume on the meter.The Cerb is a V8 and therefore only revs to 5,750 rpm, just like the RV8.
If you all remember that you may find it a lot easier to pass noise testing, as readings are taken at 3/4 of max revs!!!!!!!!
Tim
Be in gear and slip the clutch very lightly with your foot on the brake. Loading the engine stops the pops and bangs.
Decatted with a standard back box: http://www.youtube.com/watch?v=F756NquhwUQ
No track days for me this year then
No track days for me this year then
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