Jump to content

police exhaust noise tests!! arrrr


Recommended Posts

Got stopped last night in suffolk (were i work) and the copper did a sound test on the vr.. apparently it has to be below 90db at 3/4 max revs and 82db or below at idle. Mine gave reading of 81db at idle and 98db at 4250prm. I dont think my exhaust is excessivly loud..its a full stainless system with a single oval pipe.. got a 30 quid fine and regestered on their system and if it gets tested again and fails i have to go to court! seems a bit extreme to me!

Link to post
Share on other sites

May be worth looking into how he carried out the tes. As a qualified noise assessor I would be interested to know where he placed the sound meter. Noise has to be calculated at ear level or at a moderate level to take into account height variations in the human. Sticking the noise meter near the exhaust is pointless!

Link to post
Share on other sites

My system has the cat and then just the rear box..

He put the meter on a tripod about 8in away from exhaust.. at exhaust level not ear level.. was pretty much on the ground and right next to exhaust! took the background reading, took a reading at idle then took 3 readings at 4250rpm.

Link to post
Share on other sites

My system has the cat and then just the rear box..

He put the meter on a tripod about 8in away from exhaust.. at exhaust level not ear level.. was pretty much on the ground and right next to exhaust! took the background reading' date=' took a reading at idle then took 3 readings at 4250rpm.

[/quote']

That will obviously give you the level coming out the exhaust but will not give to a true reading at ear level. Depending on the angle of your downpipe it may also incur reverb off the ground or surrounding material. As you where pretty close to the legal limit it may be worth investing in a letter to the local plod. Ask for proof the meter has been calibrated and proof the policeman has been thoroughly trained in its use.

Link to post
Share on other sites

Thats really pants. :-(

What happens about the older sports cars that are loud? Because some of them are quite loud!

Surely they can't start making them put extra silencers into their exhausts?

like most motoring things in life where the police are concerned mate - young blokes in sporty looking cars are an easy target !! cant see a middle aged bloke in a TVR getting stopped but a youngish bloke in a vr for sure !! and I know for a fact that they are a lot louder than most of our cars

Link to post
Share on other sites

this is the problem with the english police they cant be asked to go sort out real problems like wepons and robberys instead they just want to rob the person who bought there car, paid there road tax and is earning money for england and to fuel that car they normaly get fined in.

Link to post
Share on other sites

May be worth looking into how he carried out the tes. As a qualified noise assessor I would be interested to know where he placed the sound meter. Noise has to be calculated at ear level or at a moderate level to take into account height variations in the human. Sticking the noise meter near the exhaust is pointless!

You beat me to this.. What calibrated instrument did he have to demonstrate the noise meter was at least a metre away etc etc etc from memory most noise polotion levels have a specific distance(s) applied to it and if they are doing the test then their metre must be a calibrated metre (distance) if you see what I mean.. Worth checking what the SVA tests require.

Link to post
Share on other sites

I think now i have herd what you guys have said i will get a letter sent out as the more i think about it the more unrealistic of a test it seems to put the device about a ft away from the exhaust at ground level. failing that i guess it a new system.. with another silencer in!!

Link to post
Share on other sites

this is the problem with the english police they cant be asked to go sort out real problems like wepons and robberys instead they just want to rob the person who bought there car' date=' paid there road tax and is earning money for england and to fuel that car they normaly get fined in.

[/quote']

+1 they are getting more and more petty and cant be arsed to do their real job, had a doing with police lately involving some bint throwing a glass and drink over my gf in a bar, instinctively she collared her and pushed her to the floor, as you would if you got a drink chucked over you. The police gave my gf a caution for get this assualt and battery, and they couldnt be arsed to follow up on the other girl who should have got disturbing the peace, causing affray and potentially assualt with a deadly weapon, the glass. They dont get an ounce of respect or co-operation from me.

Link to post
Share on other sites
×
×
  • Create New...