Do you mean you are now using two silencers by this comment "for the moment i have fixed a Caterham exhaust in more of the megabusa exhaust. "?
If not how does this work for you:
two silencers
pic from: http://www.wunoff.co.uk/index-2.html
Hello,
i am new at this Forum, i have a Westfield Megabusa witch is a fantastic car (thanks to the GB, for this car, i have also a defender V8 and a Buell
Bike) and i leave in France, so sorry for my English....
The car passed with no problems the tests of SVA in GB but it's not the same thing in France....
The tests are very difficult for the noise, 77 DB at 50 km/h in second speed....
It's difficult but not impossible, 2 or 3 Megabusa passed the tests in France.
So i have begin to try solutions to decrease the noise.
First is to fix at the tail of the car one other exhaust, for the moment i have fixed a Caterham exhaust in more of the megabusa exhaust.
After with the help of Cosmick i modify an Hayabusa air Box instead of piper cross.....
I will probably decrease the power of the engine.
I will fixed insulation under the bonnet and everywhere it's possible.
But it's probably not enough so if you have other ideas it's can very nice....
Thanks in advance and congratulations for the Forum.
Hi
Do you mean you are now using two silencers by this comment "for the moment i have fixed a Caterham exhaust in more of the megabusa exhaust.
"?
If not how does this work for you:
two silencers
pic from: http://www.wunoff.co.uk/index-2.html
Are you going to re-register the car in France?
Vous re-register la voiture en France ?
Yes i have two silencers but not like the picture .
one at the left (the megabusa), and one other under the car ( a big silencer of catheram 1600), for the moment i havn't test the new sound , but
it seem the more difficult is decrease the noise of "aspiration" of the motor....
Thanks
For the moment i prepare the car and after i will passed the tests of UTAC....
As the test is at fixed speed can you use large tyres to reduce rpm to minimum to achieve the test speed?
I have think about this solution , but i have already 15 " on the car and the last time somebody come at the utac with big wheels (16 "
,
the inspector refused to passed the test (and you pay before), in France the Test is each times 1300 livres, so if you missed test of braking or
polution or noise you have to paid other time 1300 livres....
But for sure the solution is to decrease the RPM, maybe i can use a power commander or something to stop the acceleration, but it's necessary to
be a nice job....
If you have a sealed duct into the airbox then that can further decrease the noise.
Retarding the ignition can also decrease the exhaust noise (I believe the manufacturers have this in their maps for this reason), but I guess you
don't want to start remapping.
Where do they put the microphone/sensor when they do a 77dB test? if it is a drive-past then how far away is the microphone?
there are 2 micros, one at the left and one at the right, at 6 meters of the car.
The driver pass one line at 50 km/H in second speed, he press on the accelerator at the max during 20 meters where the noise is taking.....
What is a sealed duct ?
Thanks
A sealed duct is 'un tuyau d'entree de la boite a air, etanche' Et a mon avis il veit dire etanche au niveau de la jonction
tuyau/boite a air.
Sorry for the rubbish french but I can see that the OP is struggling with the mother tongue.
thanks for the translation....
veld, look at the top of the screen. You have a U2U message.
Mike
A V2V non? 
MDR ReMan...
If you need to push the accelerator "to the max", then you could adjust the pedal stop so it isn't full throttle for the engine.
What I mean is
accelerator == max not equal to engine throttle body butterflies == max
I can't think of a way of saying this that will translate easily.
Thanks for the message Mike, for sure your help can be precious....
If you put a rein to the accelerateur (i m not sure for the name), where is the best place to be discreet ?
Thanks
Veld,
MK export Hayabusa engined race cars to France. I'm not sure if they are road registered, but if they are, then whatever they do to get
them through your noise test would be appropriate for your car.
Spanish noise limits for ITV (MOT/SVA) are tough too. 91dB @ 50 cm and 3850 rpm.
Hello bobinspain,
the indy witch are imported in France are not road registered....
It seem the road tests to spain are more easy than in France , the UTAC is realy a long way ....
Is it possible with a power commander to stop the rpm at 7000 ?
Put a turbo on it that should quieten it down a little 
An inline catylitic converter may help too, I flanged mine so it can be removed (ah hem for trackdays)
Got mine from Here
Seller I got my flanges from arent selling anymore but guess these are similar eBay - The UK's Online Marketplace
Cheers
Rich
[Edited on 15/1/12 by RichardK]
Richard,
I'm having MK's second hand cat to keep for "trackdays" and any other time it may be required.
I can't answer veld's q. about rpm restriction via PC5, which I have fitted to my car, as it's still in UK. If you check out the MK
Indy owners f/b page you'll see it on the MK stand at the NEC Autosport Show.
There was a R1 Fisher Fury in one of the first issues of Practical Performance Car magazine that was well down on power. It transpired that the engine was a restricted one for the German market and there were plastic fittings inside the throttle throats. I don't know if there are similar restrictors for the Hyabusa.
I have posted it up before but this is what I have done to try and reduce the noise. Induction noise from a standard suasage filter is massive! I
haven't done any test's since its been built and fitted, so have no idea at the moment if power has been affected. However the Mrs. dosent
hear me turning into the drive anymore which means that a/ my automatic garage door dosent work anymore and b/ it would appear that noise has been
reduced! (I do need to get a meter on it though). I also havent noticed any power drop but I know what the car was making before the box was fitted
and haven't managed to get it back on the rollers since fitment.
Everything is very interesting,
Richard, i have already a catalyser on the exhaust of the megabusa but is possible to put one other to decrease the noise and the polution ?
The decrease of performances is not a problem because for the circuit i come back to the original megabusa.....
iiyama i have read your post witch is very interesting, it seem for noise it's the hayabusa air box ( maybe not for the performance) but is it
possible to buy a similar air box ?
bobinspain, i will read the post of the mk....
scudderfish, do you have more infomations about plastic fittings inside the throttle throats ?
THANKS AGAIN
what size is the exhaust silencer? you can get sometimes 7 inch diameter silencer cans and get it made as long as will fit and repackable [so if some
new product comes into the market you can change it easily]
the westfield megabusa with standard air filter runs about 105db at 3/4 full revs static
i added cosmicks airbox which has defo reduced the noise by 3-4 db with no loss of power
the standard westy silencer is 5 inch diameter so thats next on my list to change - if i can get 7 inch to fit so be it [just need to watch the weight
in case of it snapping]
i would of also thought the position of the end tail pipe will help - maybe it can be angled down?
after that im not sure - your into real techy land then!
My silencers is 5 ", i will probably change after the test for a big bore titane or maybe like cosmick, rsv exhaust....
For the moment i have fixed a second silencers, your idea is probably fine, to changed the angle of the exit and maybe if it's not enough a db
killer like motorbike, but i need to keep a good polution.
With the air box of hayabusa you lose 4 DB ?
Re the throttle stop behind the throttle pedal there is a bolt which acts as the the stop
Here you go
Get a longer bolt in there to restrict the rpm
Very good solution ....
I hope it works for you
Just another thought have are you running the reverse gearbox? It might be worth putting some sound deadening down the transmission tunnel as well.
Although I own a Megabusa I have not got the reverse box and have only been in one that had one fitted. I was too busy being scared to notice any
noises 
Actually thinking about what Scudderfish mentioned we have restrictors that have to be fitted to bikes over here to limit them to 33bhp. Will see if I
can find the details
Found it
http://www.fiinternational.com/default.asp
It appears they are the sole UK seller for these kits. Glad I passed my bike test years ago
[Edited on 15/1/12 by SJL]
[Edited on 15/1/12 by SJL]
In france the Hayabusa until 2008 , to stop the power at 100 cv (because we are probably the only country in the world where the Bike are limited to
100 cv), use metal restrictor to put in the admission.
I have passed an order i want to know if i decrease the power of the engine i decrease the noise too....
Thanks for the links.
Maybe it's possible to passed an order to a shop ?
I will call them for you tomorrow if would like and see if they will sell a kit to you and get some more information from them.
Will report back during the day on Monday
marvelous....
Thanks
My hovercraft is full of eels
Hi veld,
Most power restrictors are just plates that fit between the injector bodies and the head. They will doubtless drop the noise but as this is just a
temporary mod I'd think twice before spending £179 + delivery costs.
The Hayabusa 100cv french restriction is made via the ECU. Cutting a blue wire generally liberates the other 80 or so horsepower.
If you really want to spend some money I reckon you'd be better off buying a db meter from Maplin or another supplier to measure the noise level
and check what the various mods are giving you.
And well done for taking on the french administration... Good luck, and I'll keep you posted once I've spoken to my engine man.
Mike
The Hayabusa 100cv french restriction is made via the ECU but until 2008 there is a restriction mécanic too....
I have buy a db meter but for the moment the result is not very good......
Hello,
I can't help much with this but I'm curious. Why are you taking the UTAC registration if the car was road-legal in the UK? Can't you
import it and get French plates after import?
One day I'll have to register the kit I'm building to be road-legal in Portugal and I was told the best way was to get it road-legal in the
UK and then hire an import company (that knows the inside of things) to take care of the import paperwork. And that would be cheaper than doing it
here. We also have the 77Db noise limit but, according to the law, it can be in 3rd gear (depends on horse power of the car).
Good luck with the noise reduction and the paperwork!
HappyFather
My Suzuki SV650S had a microswitch in the gear box which was activated by second gear which limited the revs for the drive by tests, a mod to remove
the switch was published and I disconnected it.
Would it be possible to restrict the revs using a rev limiter in your ECU by rigging something similar.
Hello HappyFather, in europe when a car is road legal in one of the country , it's road legal in every country, but not in france, i have a V5
but i need to passed the test of UTAC witch is very restrictive, are you sure it can be in 3 speed in Portugal ?
That for why it's very difficult to import , BEC, R500 or Ariel ATOM in France.
The idea for the switch in the gear Box is very interesting, i don't know if it's possible whith the Megabusa....
quote:
Originally posted by HappyFather
Hello,
I can't help much with this but I'm curious. Why are you taking the UTAC registration if the car was road-legal in the UK? Can't you import it and get French plates after import?
One day I'll have to register the kit I'm building to be road-legal in Portugal and I was told the best way was to get it road-legal in the UK and then hire an import company (that knows the inside of things) to take care of the import paperwork. And that would be cheaper than doing it here. We also have the 77Db noise limit but, according to the law, it can be in 3rd gear (depends on horse power of the car).
Good luck with the noise reduction and the paperwork!
HappyFather
quote:
Originally posted by bobinspain
I thought we were all in the EU and these national rules didn't apply. Not so I'm afraid. Any opportunity to make money from the motorist is regarded as fair game.
The test of UTAC
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I have just spoken to FI International and they do not think that the kit will work at reducing the noise for you.
Part of the kit is a throttle body restriction and a different throttle stop.
They did advise me that the kit is actually made in Germany and have given me the company details as FI will not sell any products outside of the
UK
http://www.alphatechnik.de/
The guy I spoke to thinks they might be able to help you if you are stuck.
Hope that helps
Steve
Happyfather
If all the testing centres 'sang from the same hymn sheet' it'd be a start. However, here, we have the situation where certain test
centres are favoured for their leniency over others by punters and a 'mobile ITV' centre which visits the remote areas is better still. Add
that to 'which side of the bed did the tester get out of' and you have the dog's breakfast situation currently in force here.
Little wonder that a lot immigrants chose to drive rot-boxes that have never been anywhere near a test-station.
I know of a poster with a GBS Zero who's moved heaven and earth administratively to try and get it road registered to no avail. He's based
down in Extremadura, and despite having spoken to 'the great and the good,' plus any number of 'fixers,' palm-greasers' and
those 'in the know,' he was no further forward after months of effort. Serendipity found him carimportinspain whose website says 'Kit
cars-no problem.'
As usual, it's a case of not what you know, but who.
Thank you Steve,
i will contact the society in Germany, maybe they have a solution....
i think in future anyone building would find it easier to buy a 2nd hand car already registered then modify it keeping within the limits if poss. you already have the legal papers for being roadworthy so it would be more sensible i think
quote:
Originally posted by :{THC}:YosamiteSam
i think in future anyone building would find it easier to buy a 2nd hand car already registered then modify it keeping within the limits if poss. you already have the legal papers for being roadworthy so it would be more sensible i think
In France to restrictive the power of Hayabusa there is this in the admission, so i will try to see if the noise decrease....
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To update my earier post, I checked the car with the same noise meter in the same location as before the air box was fitted. Unbelievably Ive lost around 8db! All I need to do now is get it back on the rollers a nd see if Ive lost any power!!
That doesn't surprise me....intake noise is a big issue with ITBs.
It didn't surprise me that I lost noise, just how much I lost!