Track Cerbs that Pass 105dB
Discussion
sjc1969 said:
At goodwood last weekend a tvrcc Cerb owner used ACT track day silencers and that got him to pass their 105dB limit. It was very tight though, he just made it. And his Cerb is loud as you like.
This is what I use, they get me just about to 105dB, I also sometimes add a little extra exhaust wadding stuffed into the track cans to get the level right down, was measured at Spa at 94dB, once the noise test sticker was issued I just took the extra wadding out and ran with the normal track cans, never have a problem with the drive by.What normally makes our cars register as so loud is the cracks and pops that are not present under driving conditions but holding 4.5K RPM on a light throttle make mine sound like the sound track to the battle of the Somme.
I do not find that the track cans restrict the engine too much, a little at high revs but I think it has more low end torque with them on.
I have the full large bore ACT sports system, decats and the balanced headers.
De-catted, standard back box (4.5 on a 4.2 though). 'Apparently' better silencing qualities (?).
I haven't had a problem getting on track - although I do have to make sure the engine is warm to lose the pops and bangs as much as possible.
Spa was a test because I was staying really close to the track and trying to get the car warm in those temperatures was a challenge!
I haven't had a problem getting on track - although I do have to make sure the engine is warm to lose the pops and bangs as much as possible.
Spa was a test because I was staying really close to the track and trying to get the car warm in those temperatures was a challenge!
amazon said:
De-catted, standard back box (4.5 on a 4.2 though). 'Apparently' better silencing qualities (?).
I haven't had a problem getting on track - although I do have to make sure the engine is warm to lose the pops and bangs as much as possible.
Spa was a test because I was staying really close to the track and trying to get the car warm in those temperatures was a challenge!
Not to mention the dubious accuracy of their measuring equipment on the day, Lotus normally 98dB measured 105 that day so my Cerb was not alone struggling to pass;-)I haven't had a problem getting on track - although I do have to make sure the engine is warm to lose the pops and bangs as much as possible.
Spa was a test because I was staying really close to the track and trying to get the car warm in those temperatures was a challenge!
SP Backbox with straight through decat, got a 103 pass at Spa albeit slightly light on the pedal 
Was measured 106db to the letter of the law and Goodwood last year and they did (finally) let me out with stern warning re drive by noise- checked later with them and drive by was not a problem. Since then bought the inserts so can get it down further if needed - never yet had to fit, so don't know what I will get with them in, would be nice to get to 98 to give more options.
Was measured 106db to the letter of the law and Goodwood last year and they did (finally) let me out with stern warning re drive by noise- checked later with them and drive by was not a problem. Since then bought the inserts so can get it down further if needed - never yet had to fit, so don't know what I will get with them in, would be nice to get to 98 to give more options.
touching cloth said:
Was measured 106db to the letter of the law and Goodwood last year and they did (finally) let me out with stern warning re drive by noise- checked later with them and drive by was not a problem.
Was that before or after you cable tied my ACT TD cans INSIDE your SP tail? 
Decatted ACT Big Bore system with ACT track cans JUST gets me to 105dba
I've got ACT rear silencers that bolt on in place of the rear tail pipes. Takes a couple of minutes to fit.
However, it's still very close (I have the ACT slightly bigger bore system).
Mind you, "You do know it revs to 5,500 rpm", so a sound test at 3,500 to 4,000 rpm always helps!!
Can't get used to the lack of noise, but it's only for a day on track and it clears its throat on the way home!!
Rob
However, it's still very close (I have the ACT slightly bigger bore system).
Mind you, "You do know it revs to 5,500 rpm", so a sound test at 3,500 to 4,000 rpm always helps!!
Can't get used to the lack of noise, but it's only for a day on track and it clears its throat on the way home!!
Rob
ACT quiet system with ACT manifolds, 106DB at 4500 revs with straight through pipes. 98 DB with trackday cans or 90db with cats and track day cans.
On my car the Silverstone performance exhaust needed the cats in to make 104Db, plus is didn't fit properly, low road clearance, damaged my car, weighed 10Kg more... Sounded nice with the cats out though.
If I was buying now I'd get the ACT system with the changeable tailpipes
On my car the Silverstone performance exhaust needed the cats in to make 104Db, plus is didn't fit properly, low road clearance, damaged my car, weighed 10Kg more... Sounded nice with the cats out though.
If I was buying now I'd get the ACT system with the changeable tailpipes
Onzlouk said:
That's what I have!!! Gets my vote!!!Rob
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