Are Donington and Bedford drive by limits comparable?

[Hark]

I'm doing Donington on the 13th with a 98db driveby, which I have passed before.


I'd also like to Bedford, despite the limit being 88db.


If I am below 88db at Donington is there a good chance I'll be ok at Bedford??

I've heard something that they measure in different ways??

[jonnyleroux]

Measured from different distances, hence the disparity in limits. Doningtons 98dB is from the side of the track (literally a few metres from the kerb) whereas the meters at Bedford are much further away - don't know exactly but would guess at ~15m or so at least. Haven't been to Bedford for years but i'm sure one of the regulars will confirm a more accurate distance.

Jonny
BaT

[E36GUY]

I too thought Bedford's driveby was remarkably low and very different to the static test figure they publish. Jonny's reply would explain that but it would be nice to know for sure!

[grahamn]

The Mics are very easy to spot at Bedford, just lift slightly as you pass.

[Hark]

I have no idea how close I am though. Don't want to book it and then get kicked off. Could drive down there and get it checked, but that's a pain in the ass.

Think Bedford is 20m from the track.

[Stephanie Plum]

What car are you taking? You have a VX220 according to your profile on here? If that I suggest a post on the vx220 forum explaining what set up you are running and someone will prolly be able to give you an idea. If it's a turbo my guess is you'll fail at Bedford. If it's n/a dependent on your exhaust you might be ok.

[Steve H]

I think that most cars that can get through at Donny would pass at Bedford but as stated above it's not an exact science comparing different tracks.

If you want to know how close you are to the limit at Donny ask your TDO to introduce you to the very nice lady that does the noise monitoring and ask if she will make a note of what your car is testing at.

[Hark]

Stephanie Plum said:

What car are you taking? You have a VX220 according to your profile on here? If that I suggest a post on the vx220 forum explaining what set up you are running and someone will prolly be able to give you an idea. If it's a turbo my guess is you'll fail at Bedford. If it's n/a dependent on your exhaust you might be ok.

Ye my VX220. It's supercharged which causes the noise issues.

It's been discussed at length on the VX forum. The outcome being 'you might pass, but most supercharged cars don't bother.'

The 250bhp SC cars have passed on some occasions.
I don't know of any of the 300bhp SC cars that have.

[Terzo204]

The main difference between the two is the means of measurement.

At Bedford you will be static tested (1m away at 45 degrees from the exhaust at 3/4 revs) with a limit of 101db. You may pass this but the drive by is a tough one. There are 4 mic's at approx 10m from the edge of the track with a limit of 88db.

Donny will be less stringent I am lead to believe with no static and 98db drive by.

Asking another VXT driver is the best idea, or go to your local sprint and get tested to make sure. Don't chance it as you don't get a refund.

Mike

[Stephanie Plum]

Hark said:

Ye my VX220. It's supercharged which causes the noise issues.

It's been discussed at length on the VX forum. The outcome being 'you might pass, but most supercharged cars don't bother.'

The 250bhp SC cars have passed on some occasions.
I don't know of any of the 300bhp SC cars that have.

Ok. In that case I'll stick my neck out and say you'll probably fail. I can't remember the last time we had anything other than an n/a VX220 on one of our events there (LOT) and when I get s/c cars at say Goodwood on a 98db static day, I know I'm in for some potential issues with the drive by. As people have said, one strike and you're out at Bedford, no second chances.

[boxsey]

If it's of any help my car is consistently 100 db on static tests and I have no problems with driveby at Donington or Bedford.

See you on the 13th at Donington if you go for it.

[Hark]

I'll definitely be there in the 13th as I've passed there without issue.

Presume you'll be in the 964 in your profile. If you see a ropey looking vx pop over and say hello.

Matt

[boxsey]

Hark said:

I'll definitely be there in the 13th as I've passed there without issue.

Presume you'll be in the 964 in your profile. If you see a ropey looking vx pop over and say hello.

Matt

Yes will do, there will be five of us there in 964s

[Hark]

Back from Donington. Drive By was 91.4 db (so well under the 98!)

That was measured on the pitwall so the 20m distance at Donington would be much easier. 87db is ALOT quieter though.

[boxsey]

Hark said:

Back from Donington. Drive By was 91.4 db (so well under the 98!)

That was measured on the pitwall so the 20m distance at Donington would be much easier. 87db is ALOT quieter though.

From what I could tell very few people had noise problems yesterday and it turned out to be a great night. I said hello to a chap in a silver VX but he looked a bit mystified when I asked if his name was Hark.