Passed the static , failed the drive by

[jonathon5]

Did a track day today at croft 88 db limit.

I passed the static test @ 86 db 3/4 max revs

Failed the drive by 80 db

The exhaust was a saxsport with a center box added

I was not the only one to fail the drive by, 5 others failed

We just had to coast past the track side microphone every lap . It lost at least 3 - 4 seconds a lap. But beat going home.

Looks as though I need to make the exhaust quieter again.

[Jay_]

wow....Guess that means supersprint race zorst will be well over then.... noise regs are a git!

[Bedford126]

My old work (made redundant on Friday) use to have a evo mate that failed every track day noise reg at croft.

He tried everything and in the end he got a tip made that fastened to the end of his exhaust with a clamp that directs the noise to the ground so the sound waves bounce on the floor before being picked up by the drive by mice's.

could be worth a try it can reduce noise by up to 18%.

Just a Idea.

[jonathon5]

I may have a side exit made. Side away from the mic

[kristel10589]

88, thats the lowest I seen at a track!

[Dave_P]

I've bought a saxsport with m/s cat hoping the cat will help reduce noise, time will tell...

It would be handy if these exhaust suppliers had detailed info on db levels.

I take it you don't have bodies fitted ? They'd really light up the db meter on the drive by!

[AndySAXOp]

My supersprint with middle box was only 83 dB sound like the saxsport maybe alittle louder.

But yer most track days are about 100db limits seem low.

[Jay_]

Originally Posted by jonathon5

I may have a side exit made. Side away from the mic

surely this depends on the track though? you go to another low noise track that is the opposite direction (clockwise-anticlockwise) then it will be even worse?

[AndySAXOp]

and i never been pick up on drive by, and been to cadwell, rockingham and snetterton.

i have come to the conclusion that tracks with strict dB levels, there not much point me going to them make it easier.

[jonathon5]

Originally Posted by Dave_P

I've bought a saxsport with m/s cat hoping the cat will help reduce noise, time will tell...

It would be handy if these exhaust suppliers had detailed info on db levels.

I take it you don't have bodies fitted ? They'd really light up the db meter on the drive by!

No bodies ,

I have got loads of videos of the car & sound. I will have a listen to see how loud it really was

[MiniGibbo]

Only thing you can do is lift off as you have realy..

Ive seen countless new GTR's fail drive by;s in oem form lol.