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2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 12:14 am
by a4drk
Has anyone tried the 7 inch & 8 inch optional tail pipe exhausts ?
according to the website they are meant to be quieter,
I need to do something, as mine is 101.5 db
got black flagged at Donnington for being too noisy
David
http://www.2bular.co.uk/exige-s2-2zz-ge ... ust-system
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 12:29 am
by DougT
Don't ask me, I was 105 without trying...
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Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 12:51 am
by campbell
"Tubular" = "Black Flag"
New dictionary def
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 1:12 am
by Victor Meldrew
Jim built me an exhaust specifically for my engine spec, we went with the largest possible box size to keep the noise down. Never had any issue at Donington. I would suggest the person to ask would be Jim Valentine himself. Unless standards have fallen in the last few years, the service was always first class.
The mistake most people make is speccing an exhaust with to large a bore thinking they will get more power, you cannot silence the exhaust effectively with a massively oversized bore.
The engine in my S1 was putting out just under 200bhp at 8000rpm and the 1 3/4" system was specced as optimum for that engine. Jim has a software program that works out gas velocities from rpm and engine capacity. The exhaust is specced from that. Go too big and the silencing is less effective and you loose the scavenge effect.
I hope he hasn't just said, fcuk it I will just sell the biggest bore I can, that would be a real shame.
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 1:55 am
by tut
Make sure that the black flags at Donnie were caused by your exhausts, with N3 yellow it was the induction that was the problem.
tut
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 10:26 pm
by neil
Is the 6/7/8" not meaning the diameter of the actual back box rather than the tail pipe? I think the tail pipe's the same size on all of them. Could be yours has lost it's packing or are you running with a sports cat? I had the 8"x24" on my RGB and still got black flagged at Zandvoort although that was with a sports cat.
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 11:24 pm
by a4drk
Neil, in July at croft the static test reading was 98db,
At Oulton it was 101.5 static
Does sound louder
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 11:29 pm
by a4drk
Neil, think you are right. All the tailpipes are 6"
It's the diameter of the backbox
Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Mon Nov 09, 2015 11:54 pm
by Victor Meldrew
When I ordered my exhaust I was given the choice of three primary bore sizes. 1 1/2, 1 3/4 and 2 inch. The Toyota engine cars may only be offered in one size I don't know.
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Re: 2bular Back box for Exige - 7" & 8" oval options
Posted: Wed Nov 11, 2015 10:38 am
by Andy G
Davids car doesn't have an SC, its certainly not induction noise related gents trust me!