R33 GTR Blitz Nurspec Exhaust - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

zenwahwong56 · 29th June 2012, 12:09 PM

Hello All,

Just a quick question, I have the Blitz nur spec exhaust without the bung and am thinking about going on track, however I have no idea if the decibal of the exhaust is to loud? The track im going to is Bedford Autodrome.

Any one had issue getting on?

How do they mesure the decibal? next to exhaust? or couple feet away?

Info I have so far is they mesure up to 5krpm

Many Thanks

Zen

Mookistar · 29th June 2012, 12:31 PM

you won't have any chance whatsoever without the bung. Even with the bung in you will probably fail the test I am afriad. Bedford is one of THE worst for noise limits

mook

zenwahwong56 · 29th June 2012, 12:47 PM

Dam! Thanks for your info!

Mookistar · 29th June 2012, 12:54 PM

they do two measurements. one is 45 degrees from 1 metre away at 5k (fairly easy to pass)

The other is drive by on track, and the microphone is on the main straight, so basically full throttle.

you get NO second chances or "strikes" you break the drive-by ONCE and you are kicked off for the day. It's not very fair but it's the only way to appease the local council/busy bodies.

I got kicked off in a metro.

mook

zenwahwong56 · 29th June 2012, 01:32 PM

How in the world do others cars passed this regulations, cars like v12 etc?

Mookistar · 29th June 2012, 04:11 PM

they don't. not at a normal trackday at Bedord, unless they have standard, quiet exhausts.

surcalation · 4th July 2012, 05:04 PM

I am looking to do Bedford Autodrome in my 34 gtt with a nurspec exhaust but I have a silenced decat. I have the bung but really dont want to have to put it on and would rather not go! At Donnington this weekend (Japfest 2) and hoping to at least get a drive by reading there as its 87.5db at Bedford and 98db at Donny.

zenwahwong56 · 4th July 2012, 07:37 PM

Hi,

Thanks all for replying, surcalation how does the silent decat compare to normal decat? Any power loss? Let us know what drive by u get down japfest2

surcalation · 4th July 2012, 08:31 PM

Never had a none silenced decat on mine but will let you know how I get on. Wouldn't be able to comment on power loss. Maybe someone with more technical knowledge on here would be better at answering it

Might only be able to get a static unless I can find someone who works for the track. Organisers for Japfest 2 said it would not be possible to get a drive by db. Yet they stated you could be black flagged from a loud drive by. Surely it's not just me who thinks that does not make sense

surcalation · 8th July 2012, 08:29 PM

Got a reading of 86db at 4k revs today at Donington in a static test. Did not get a drive by reading as I did not trigger the 98db which doesn't help when it's 87.5db at Bedford!

HTH

zenwahwong56 · 8th July 2012, 08:37 PM

Good to hear back from you.
So with the silent decat it reduces to 86.9dbs that's brill, as normal is 98dbs at 5k with bung, without bung it's 103dbs

so looks like the silent decat is a must. If I can source one.

Thanks for your update

surcalation · 8th July 2012, 08:55 PM

I got mine from Japspeed when they had them in stock! £79

They may have some arriving soon via a slow boat from reading the other forum I frequent

dragerboy · 8th July 2012, 08:57 PM

Silent De-cats do not reduce power over a de-cat. Japspeed do one for £100.

29th June 2012, 12:09 PM	#1 (permalink)
zenwahwong56 zenwahwong56 is indeed for speed Executive GTR Owners Club Member Join Date: Jan 2010 Posts: 185	R33 GTR Blitz Nurspec Exhaust Hello All, Just a quick question, I have the Blitz nur spec exhaust without the bung and am thinking about going on track, however I have no idea if the decibal of the exhaust is to loud? The track im going to is Bedford Autodrome. Any one had issue getting on? How do they mesure the decibal? next to exhaust? or couple feet away? Info I have so far is they mesure up to 5krpm Many Thanks Zen __________________

29th June 2012, 12:31 PM	#2 (permalink)
Mookistar Mookistar is nearly up to 20,000 posts Site Admin. Join Date: Feb 2004 Location: www.askmook.co.uk Cars owned: Mookra and R33 GTR Posts: 19,822	you won't have any chance whatsoever without the bung. Even with the bung in you will probably fail the test I am afriad. Bedford is one of THE worst for noise limits mook __________________ Support the forum by Supporting our Sponsors. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Please note, I cannot help you with GTROC membership enquiries.

29th June 2012, 12:47 PM	#3 (permalink)
zenwahwong56 zenwahwong56 is indeed for speed Executive GTR Owners Club Member Join Date: Jan 2010 Posts: 185	Dam! Thanks for your info! __________________

29th June 2012, 12:54 PM	#4 (permalink)
Mookistar Mookistar is nearly up to 20,000 posts Site Admin. Join Date: Feb 2004 Location: www.askmook.co.uk Cars owned: Mookra and R33 GTR Posts: 19,822	they do two measurements. one is 45 degrees from 1 metre away at 5k (fairly easy to pass) The other is drive by on track, and the microphone is on the main straight, so basically full throttle. you get NO second chances or "strikes" you break the drive-by ONCE and you are kicked off for the day. It's not very fair but it's the only way to appease the local council/busy bodies. I got kicked off in a metro. mook __________________ Support the forum by Supporting our Sponsors. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Please note, I cannot help you with GTROC membership enquiries.

29th June 2012, 01:32 PM	#5 (permalink)
zenwahwong56 zenwahwong56 is indeed for speed Executive GTR Owners Club Member Join Date: Jan 2010 Posts: 185	How in the world do others cars passed this regulations, cars like v12 etc? __________________

29th June 2012, 04:11 PM	#6 (permalink)
Mookistar Mookistar is nearly up to 20,000 posts Site Admin. Join Date: Feb 2004 Location: www.askmook.co.uk Cars owned: Mookra and R33 GTR Posts: 19,822	they don't. not at a normal trackday at Bedord, unless they have standard, quiet exhausts. __________________ Support the forum by Supporting our Sponsors. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. Please note, I cannot help you with GTROC membership enquiries.

4th July 2012, 05:04 PM	#7 (permalink)
surcalation surcalation is FULLY aware they can edit their status but chooses not to :) GTR Register User Join Date: Sep 2011 Cars owned: R34 Posts: 30	I am looking to do Bedford Autodrome in my 34 gtt with a nurspec exhaust but I have a silenced decat. I have the bung but really dont want to have to put it on and would rather not go! At Donnington this weekend (Japfest 2) and hoping to at least get a drive by reading there as its 87.5db at Bedford and 98db at Donny. __________________

4th July 2012, 07:37 PM	#8 (permalink)
zenwahwong56 zenwahwong56 is indeed for speed Executive GTR Owners Club Member Join Date: Jan 2010 Posts: 185	Hi, Thanks all for replying, surcalation how does the silent decat compare to normal decat? Any power loss? Let us know what drive by u get down japfest2 __________________

4th July 2012, 08:31 PM	#9 (permalink)
surcalation surcalation is FULLY aware they can edit their status but chooses not to :) GTR Register User Join Date: Sep 2011 Cars owned: R34 Posts: 30	Never had a none silenced decat on mine but will let you know how I get on. Wouldn't be able to comment on power loss. Maybe someone with more technical knowledge on here would be better at answering it Might only be able to get a static unless I can find someone who works for the track. Organisers for Japfest 2 said it would not be possible to get a drive by db. Yet they stated you could be black flagged from a loud drive by. Surely it's not just me who thinks that does not make sense __________________

8th July 2012, 08:29 PM	#10 (permalink)
surcalation surcalation is FULLY aware they can edit their status but chooses not to :) GTR Register User Join Date: Sep 2011 Cars owned: R34 Posts: 30	Got a reading of 86db at 4k revs today at Donington in a static test. Did not get a drive by reading as I did not trigger the 98db which doesn't help when it's 87.5db at Bedford! HTH __________________

8th July 2012, 08:37 PM	#11 (permalink)
zenwahwong56 zenwahwong56 is indeed for speed Executive GTR Owners Club Member Join Date: Jan 2010 Posts: 185	Good to hear back from you. So with the silent decat it reduces to 86.9dbs that's brill, as normal is 98dbs at 5k with bung, without bung it's 103dbs so looks like the silent decat is a must. If I can source one. Thanks for your update __________________

8th July 2012, 08:55 PM	#12 (permalink)
surcalation surcalation is FULLY aware they can edit their status but chooses not to :) GTR Register User Join Date: Sep 2011 Cars owned: R34 Posts: 30	I got mine from Japspeed when they had them in stock! £79 They may have some arriving soon via a slow boat from reading the other forum I frequent __________________

8th July 2012, 08:57 PM	#13 (permalink)
dragerboy dragerboy is enjoying American Dad GTR Register User Join Date: May 2003 Location: Horsham, West Sussex Cars owned: 200sx S14 Posts: 234	Silent De-cats do not reduce power over a de-cat. Japspeed do one for £100. __________________

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