andyfiggy2002
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| posted on 22/8/17 at 08:55 PM |
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Doesn't a 1400 rev to 10k & a 900 to 12k? So I think you have the advantage when it's comes to screaming motorbike engines
considering the noise tests done at 3/4 max revs on strictist tracks? Or is it 2/3? anyway i would love to fit a dustbin but as Ive only 21" of
space would need a bloody fat dustbin & then im gonna hit ground clearance issues. I guess could chop my headers down so instead of 4 into 2 into
1 maybe try 4 into 1 to allow more length (ohh err missus) on silencer or as ive mentioned just have my 4" with additional one connected in-line
in rear boot space. I mean your boggy standard road car has 2 silencers or technically a resonator & silencer, maybe some one could enlighten me
to the diff between a resonator & a silencer?
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Phil_1471
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| posted on 23/8/17 at 05:15 PM |
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Try a stock exhaust, I have one from a GSXR for my R1 4xv works really well as has 3 internal chambers to help reduce pulse.
http://drriders.com/topic8341-10.html
Phil
You can live in a car but can't rally a house
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andyfiggy2002
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| posted on 23/8/17 at 07:57 PM |
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I was going to use a chambered R1 can until AB told me under hard track day use it would increase engine temps because of it's more restrictive
nature
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Phil_1471
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| posted on 24/8/17 at 05:45 AM |
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I agree with AB. However it's similar to putting more boxes on, you will restrict flow causing heat build up. I guess it's about finding
the balance between cost, decreased performance and heat build up and noise.
You can live in a car but can't rally a house
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andyfiggy2002
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| posted on 24/8/17 at 06:37 AM |
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I posted this thread as a discussion point & maybe I come out with some wacky ideas but thats how the design of an F1 car evolves, thinking
outside the box.
So why are ALL exhaust tailpipes round directing the noise into a small spot, what if you diffused the sound by fitting a fishtail tail pipe similar
to the old vintage motorbikes rotated so it was directed under the car at say 45 degrees down so it bounces off the road surface first, the noise
would be thrown backwards with the airflow, possibly need some heat shield initially to protect underside of car. Isnt it the same theory that when
you water the garden with a hose pipe the nossle can be adjusted to either throw out the water in a long thin stream or diffused outwards where it
travels half the distance but over a wider area??? I mean where would mr scruitneer direct his noise meter?
[Edited on 24/8/17 by andyfiggy2002]
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Paul_r
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| posted on 24/8/17 at 07:30 AM |
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My 893cc Megablade is fitted with the AB performance composite airbox along with a repackable 6" can. I too was worried about passing the static
noise test on my first track day at Oulton, prior to the day I took it to Oulton whilst there was another track day on and asked the marshalls to
noise test it for me, this gave me the time to make modifications if necessary. However, I needn't have worried because it passed easily - if I
remember correctly it read high 90's on the static and never triggered any of the drive by noise monitors :-)...I've attached some
photo's of the set up below:
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andyfiggy2002
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| posted on 24/8/17 at 07:41 PM |
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Ok I think we've got oulton & anglesey covered........ what about stricter tracks like bedford, donington, goodwood, thruxton or combe in a
12000 rpm BEC & what are these tested at 3/4 or 2/3??
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