The M3cutters - UK BMW M3 Group Forum
 

Go Back   The M3cutters - UK BMW M3 Group Forum > M3cutters Garage > Track-days



Reply
 
Thread Tools Display Modes
Old 18th July 2018, 04:44 PM   #1
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default Bedford Autodrome and noise limit

Anyone know if an F80 with an Akrapovic exhaust will be ok at Bedford?

I used to run my E92 M3 with an Akrapovic there without issue, but I am not sure if this is louder or not?

Thanks
Telsy is offline   Reply With Quote
Sponsored links
Old 31st July 2018, 08:43 AM   #2
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

Has anyone or know anyone who has taken an F8* to Bedford with an Akra or had it sound tested at any tracks with the result?
Telsy is offline   Reply With Quote
Old 31st July 2018, 06:04 PM   #3
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

So, used an iPhone app to get some sort of idea on noise level and using a stool to sit the phone on at approx. 0.5M and 45 angle from the exhaust it recorded 111.9 dB at 5K rpm valves open and 99.5 dB at 5k rpm valves closed

Static at Bedford is 101 dB drive by is 87.5 dB I think
Telsy is offline   Reply With Quote
Old 31st July 2018, 06:39 PM   #4
Brunty88
Wearing official robes
 
Brunty88's Avatar
 
Join Date: Sep 2017
Posts: 422
Car: C63 AMG and e46 M3
Default

Yes correct I've used the app on my phone and a proper noise db tester
My phone generally rear 8-10 db more than the tester
However when I went to snett the app was closer to the one they used
They are strict as hell I've seen cars turned away at the static and after a drive around
If you can run with them closed you should be fine
Brunty88 is offline   Reply With Quote
Old 31st July 2018, 06:40 PM   #5
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

Quote:
Originally Posted by Brunty88 View Post
Yes correct I've used the app on my phone and a proper noise db tester
My phone generally rear 8-10 db more than the tester
However when I went to snett the app was closer to the one they used
They are strict as hell I've seen cars turned away at the static and after a drive around
If you can run with them closed you should be fine
Cheers fella.

I can pull the plug on the valves when they are closed, so that might deal with it.
Telsy is offline   Reply With Quote
Old 1st August 2018, 05:44 PM   #6
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

Found some info on this previous thread:

http://forums.m3cutters.co.uk/showthread.php?p=2199291

Me thinks the Akrapovic will be too loud for Beford
Telsy is offline   Reply With Quote
Old 1st August 2018, 06:07 PM   #7
Pdelamare
Achieved official socks
 
Pdelamare's Avatar
 
Join Date: Aug 2016
Location: Milton Keynes
Posts: 1,708
Car: E92 M3, Mercedes E63 5.5, Caterham Levante, Smart Prime
Default

Only way to know is pop to a nearby track and ask for a noise test.
Pdelamare is offline   Reply With Quote
Old 1st August 2018, 06:10 PM   #8
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

Quote:
Originally Posted by Pdelamare View Post
Only way to know is pop to a nearby track and ask for a noise test.
Yeah, going to see if I can get one at Silverstone on Monday
Telsy is offline   Reply With Quote
Old 1st August 2018, 11:35 PM   #9
Scottyboi
Achieved official socks
 
Scottyboi's Avatar
 
Join Date: Nov 2014
Location: Bedford
Posts: 1,399
Car: 2006 BMW M3
Colour Combo: Silver grey / Recaro SPG
Default

Bedford is a tricky one.
I’ve had such a variety of results when tested there.
Fluctuation of 10db between different days.
Scottyboi is offline   Reply With Quote
Old 2nd August 2018, 05:31 AM   #10
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

Hmmmm, will report back after Silverstone and if I was able to get noise tested there and what the result was.

The Bedford session is an evening one on the SW Circuit and was only wanting to take my brother in law for the experience of a trackday whilst he was over here on holiday. Not sure I want to take a 5 hour round trip in an afternoon with no track time because I fail the noise test. I am sure he wouldn't thank me for that!
Telsy is offline   Reply With Quote
Old 6th August 2018, 07:19 PM   #11
Telsy
Achieved official socks
 
Telsy's Avatar
 
Join Date: Sep 2010
Location: Southampton
Posts: 7,277
Car: 2017 F80 M3 DCT Comp pack
Colour Combo: Silverstone / Black
Default

So, the very kind people at Silverstone carried out a static noise test for me and the results are:

Sport/Sport + 108 dB
Efficient 95 dB

Just need the quickest and easiest way keep the valves shut when in sport/sport+ (they even open in efficient) and I will be fine.

Who has the easiest way to unplug valves temporarily, is it a fuse or the actual plugs on the servos on the back box?
Telsy is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes



All times are GMT. The time now is 06:03 PM.


This website uses cookies. By continuing to use the site you are agreeing to our use of cookies. To find out more about the cookies this website uses, click here.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © 2007 - 2018 M3cutters. All Rights Reserved.