TrackSkills track days...

[Graham]

... here is an updated email of the sound problems.

It was on the Monday after our last track day that a letter from the 500MRCI landed on my hall floor. It informed me that the decibel limit for vehicles at our track days was 98Db and not the 95Db that I had been told. This was to be measured with the car at two thirds rev limit, at a 45º angle from the exhaust, at .5 meter distance.

To put this into perspective, this is the MSA regulation limit for rally cars on road stages. The great majority of cars that attend our events should meet this limit.

We intend to adopt the following stance, with the agreement of the 500MRCI. If anyone's car is slightly over the limit, say up to 100Db, we will allow them to run on the proviso that the car is silenced for the next event. I cannot see this policy being abused since most cars will not be over the 98Db limit anyway. However, if anyone's car is way over the limit, they will not run.

 

[Nazor]

A ball of wire wool held in with a screw will do the trick after the test rip it out!!! lol

 

[RMS_CLK]

Whats the point of measuring it free-revving, when the noise is mainly made with engine load.

 

[Graham]

thats the way the MSA do it which is the general standard for all motorsport

 

[Sgt_Major]

A ball of wire wool held in with a screw will do the trick after the test rip it out!!! lol

So now they know to check the exhaust

 

[RMS_CLK]

thats the way the MSA do it which is the general standard for all motorsport

Yeah but rallycars dont have screamer pipes, and half the big power turbo cars at trackdays do, and lets face it when a screamer is letting go its gonna be way more than 98 decibels.
I think if they had any wit they would make a method of testing the cars passing by from the side of the track.

 

[Graham]

hear ya but WRC cars pass the 98db and some of the older wrc (escorts) are able to abide by it sitting still but on the stages much much louder 102dB rings a bell for a WRC es cos on chat