track day chestnut

NIL98 · Jun 27, 2006

Sorry to ask the obvious but I'm trying to find a thread decribing how i measure my exhaust noise levels. I have borrowed a meter and want to know where I stand to measure and at what revs. I'm planning Silverstone evening event limited at 98dB. Any chance? 996C2 + fabspeed exhaust.

Thanks.

Guest · Jun 28, 2006

no chance with the fabspeed!!

go to a local track or get a db noise measurer. I reckon with the fabspeed you woul dbe knocking on 104dbs.

if you do go to the track, park the rear over the grass to absorb noise. also make sure you are not near other cars or walls that will reverberate the noise.

NIL98 · Jun 28, 2006

Thanks - I've got a noise meter. How close do i stand< what revs etc??

SNB993 · Jul 5, 2006

At Goodwood in my previous 993, the sound tester was approx a metre from the back of the car and at c.4,250rpm.
It did not seem to me to be very scientific since I hit 105Db straight away with the RSR's. A second attempt by bringing the revs up slowly through the range secured entry onto the track where we had a brilliant time but being completely outshone by the GT3 boys.[

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HTH, Simon

beershark · Jul 9, 2006

996 3.4 with non-switchable PSE at Goodwood a while ago measure 97.5 on one pipe and 98.5 on the other!

MMacD · Jul 13, 2006

Hi Neil

Just wondered whether you had tested your car yet. I have ordered Fabspeeds and would be interested to know what readings you got.

Malcolm

NIL98 · Jul 13, 2006

ORIGINAL: MMacD

Hi Neil

Just wondered whether you had tested your car yet. I have ordered Fabspeeds and would be interested to know what readings you got.

Malcolm

Yes I did test it. Got quite a variation but mostly over 100-102db (3db being double the volume!). So I chose not to book the track day as it was non-refundable but I am still going (next wednesday) as a passenger so they can measure the car using their equipment.

Having siad that - took the Porker to work today and drove home the scenic route. What a blast

and the exhaust note sounded lovely.

I do find the fabspeeds slightly tiring on long journeys, the boxes are a different shape to standard and mine fouled slightly with the heat shield on one side. I suspect that is responsible for a slight boom in the cabin.

If you are near Derby or Uttoxeter (or Silverstone next Wed eve) you can hear it for yourself.

MMacD · Jul 16, 2006

Thanks for the offer Neil but I live in Surrey so won't be around. Took my car to the all day at Silverstone on 29th June though and had an absolute blast, you will enjoy it.

I am booked in to Goodwood on 1st August which has a 105dB limit, so it sounds like the Fabspeeds should be okay (assuming that they arrive and I fit by then).
Looking forward to the soundtrack.

NIL98 · Jul 22, 2006

Ended up I didnt do the track day in my car and I couldnt find the noise man at silverstone either to check if mine would be ok in the future. But there were 2 Noble M12's that were a lot noisier than mine and yet the noise man said it was a well behaved day with noone near the limit.

There another silverston eve aug 2 so Im probably going to do that.

NIL98 · Aug 2, 2006

Probably bad etiquete to reply to your own comment but ....

Went back to silverstone and did the track day this eve. Had no problems with the noise man, and I was far from being the loudest. Fantastic day, no mishaps, thoroughly reccommend it to anyone who hasnt yet done a track day with their 911. Just confirmed what fabulous fabulous car it is. Never felt out of control, progressive understeer followed by gentle oversteer under power. Munched my tyres but worth every penny.

Regards
Neil

MMacD · Aug 17, 2006

Pleased to hear you enjoyed Silverstone Neil. I have also been to Castle Coombe and Goodwood this year and thoroughly enjoyed it. I can't praise the 996 enough. I would recommend track days to anyone who wants to find out about their cars.

Fabspeed boxes arrived last week and are now fitted. Fairly easy, apart from the rusted bolts that needed to be cut off the existing clamps.

What a fantastic sound. Still surprises me when I fire it up in the morning, probably surprises my neighbours even more. The car definitely seems to breathe easier now and feels a bit quicker, but one of the baffles in the old box was loose and this was probably choking the car. I look forward to every tunnel now.

Enjoy the car.

Malcolm