Iron Horse Racing
Active VIP Member
City of Edmoton Noise Bylaw ????
So how exactly are they conducting this test.
We race motocross and there has been a lot of controversy over how the sound testing is to be preformed.
What is being done currently on the tracks is :
Decibal meter is held 90 degrees to the end of the pipe and 30" away.
Bike is held at 2000 rpm a reading taken, this is repeated three times.
The problems with this method are several...modifcations to morors can move the torque curve out of the loud zone. So a bike with aftermarket pipes but bascily stock will be louder at 2000 rpm then a modified motor with a programer and rev extender but with the same pipes. But take the modified motor to 2500 or 3000 and it will come alive and be way over.
Also the power band is different on different brands of bikes, different sizes of bikes and the big one different motor styles....ie a 2 cyl cruiser vs a 4 cyl sport bike...
So measuring them all the same just dosent make sense....
So whats the consesus on here for those that know thier bike wont pass....
....leave alone and hope you dont get tested....
....Put the stock exhaust back on and detune the bike...
Appartently the plans are to make this BS province wide....
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So how exactly are they conducting this test.
We race motocross and there has been a lot of controversy over how the sound testing is to be preformed.
What is being done currently on the tracks is :
Decibal meter is held 90 degrees to the end of the pipe and 30" away.
Bike is held at 2000 rpm a reading taken, this is repeated three times.
The problems with this method are several...modifcations to morors can move the torque curve out of the loud zone. So a bike with aftermarket pipes but bascily stock will be louder at 2000 rpm then a modified motor with a programer and rev extender but with the same pipes. But take the modified motor to 2500 or 3000 and it will come alive and be way over.
Also the power band is different on different brands of bikes, different sizes of bikes and the big one different motor styles....ie a 2 cyl cruiser vs a 4 cyl sport bike...
So measuring them all the same just dosent make sense....
So whats the consesus on here for those that know thier bike wont pass....
....leave alone and hope you dont get tested....
....Put the stock exhaust back on and detune the bike...
Appartently the plans are to make this BS province wide....
Add a reply