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Bhp or Beefy Sounds...
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By tp
#1590253
Saw a couple of posts recently about sound levels and thought I would post these results up from a selection of cars I tested at a RR day a while back. It will give you some idea of what you maybe looking at if you intend to run your car on a trackday.

All readings were taken at 5500rpm with calibrated meter 45' to exhaust outlet and 0.5meters away.


Manifold, B-pipe, Backbox, level (db)

Std, Std, Std, 93
Std, Std, Spoon, 102
Spoon 421, Spoon, Std 94
Toda, Spoon, Spoon, 106
Std, Spoon, Spoon, 104
Jr , TG, TG, 109
Std, TG, TG-Ti. 96
Std, Cobra us, Cobra, 109
DC, Spoon, Spoon, 108
JR, Eurosport, Eurosport, 105, Spercharger & Cams
Std, Mugen, Mugen, 89
Toda, Toda, Toda, 94

Couple of points from personal experience:
1. Spoon bung doesnt actually work very well. Yes it does reduce level slightly but when you lift off it bangs and pops going even higher than a box without the bung.

2. Its worth carrying your standard backbox with you as even with a full race manifold and Spoon B-Pipe it will still see you under 100db. 8)
User avatar
By Get Karter
#1590258
V useful info there....I am about to embark on exhaust mods and need to pass 98dB track tests.

How quiet is the full Toda system! Amazing!

Cheers TP [smilie=upyeah.gif]
User avatar
By GaryMan
#1590301
Good post tp 8)

I'm surprised with the toda and mugen though- hmmmmm
(as in thinking of upgrading and not as in doubting :P )


:twisted:
User avatar
By tp
#1590383
Toda did get me black flagged at Donny though last year and I think they were running a 98db day. They didnt do a static test so it was on a drive-by on one of their many stations that your likely to be on full power.

This was also running with a GruppeM, cams and nitrous so may be quite a bit higher than a normal NA setup.
Saying that, I think Jason AKA Nosman got black flagged as well and he was totally standard! :roll:
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By Iain M
#1590437
Any ideas on what a BC Spec IV comes in at? :idea: :?:
User avatar
By Get Karter
#1590452
tp wrote:Toda did get me black flagged at Donny though last year and I think they were running a 98db day. They didnt do a static test so it was on a drive-by on one of their many stations that your likely to be on full power.

This was also running with a GruppeM, cams and nitrous so may be quite a bit higher than a normal NA setup.
Saying that, I think Jason AKA Nosman got black flagged as well and he was totally standard! :roll:
Hmm! I think standard back box is going to be a necessary for me then!

So probably: DC/Jackson, Spoon B-pipe, Standard box

Should be a safe bet??
User avatar
By R34521
#1590469
really great post, thanks

How about DC , buddyclub specIV ?
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By num0021
#1590485
Great info there, "tp"! Very useful. :D
User avatar
By Dave T
#1591617
Good post Paul.

I had my DC race header and buddyclub spec 4 done last week at Cadwell on the static noise test it was 96dB. This is at 4500rpm as mine does not rev any more than that. Oh and this is with a gruppe m filter and kpro.

On drive by I got black flagged at Donny and they said it was 103dB

Dave T.
User avatar
By CLB
#1593023
Toda's an excellent setup, gives plenty of go, low noise when crusing along and a bit of a bark when pushing it. The ideal comprimise IMO.
User avatar
By SR-25
#2005650
Spec IV in VTEC i'd say about 100-104 mines pretty loud with DC header but it isn't spoon b pipe/N1 loud
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