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Exhaust Noise problem? Might be worth a try
nitram38 - 6/3/09 at 05:17 PM

I'm looking around just in case my exhaust is too loud and found this

Not as expensive as a new silencer, but might do the trick!

mistergrumpy - 6/3/09 at 05:22 PM

Might it be considered as not permanent?

nitram38 - 6/3/09 at 05:24 PM

Can't see why. You can take a silencer off with a spanner so couldn't you say that is not permenant?

mistergrumpy - 6/3/09 at 05:31 PM

Well it looks like it just sits in the end but yes I suppose you could you could knock a clamp of sorts up. Nice idea that could help a few I reckon.

nitram38 - 6/3/09 at 05:33 PM

And a lot cheaper than a £180 silencer!

johnemms - 6/3/09 at 05:43 PM

Reminds me of the end pipes on a VW beetle exhaust.. hmmm...

The chrome stick out pipes were part of the exhaust noise reduction.

almost got me wondering if you could pop one inside your pipe .. lol .. perhaps not...

wow.. vw tail pipes are cheap.....

[Edited on 6/3/09 by johnemms]

smart51 - 6/3/09 at 05:54 PM

It is a little silencer, albeit mild steel. I made one 5"long and 6" diameter to replace my link pipe. I found it made 5dB difference to just the main silencer alone.

Richard Quinn - 6/3/09 at 06:28 PM

I like the "0-9DbA reduction" bit!

nitram38 - 6/3/09 at 08:29 PM

While we are talking about noise limits, I found some info on my Quill T3 can and it has a BSAU stamp on it meaning it is road legal noise wise.
For it to be legal it has to be under 80db, so surely this should be the same noise level on my car or better because of the CAT?
I have a standard airbox so induction noise shouldn't be a problem.

smart51 - 6/3/09 at 08:53 PM

quote:
Originally posted by Richard Quinn
I like the "0-9DbA reduction" bit!


I phoned them once to ask about this. They said they've tried it on many different cars with all sorts of engines (due to them being at castle combe circuit and they are the first stop for people who fail noise tests). What they said is that some cars have huge noise reductions with them (eg 9dB) whist some don't change at all. There seems to be no pattern. What he then suggested was that the tailpipe noise perhaps wasn't what makes all cars fail the test and that intake noise, radiant engine noise and even panel resonance and gearbox whine might be making some of the cars fail. Quietening the already quite tail pipe noise had no real effect. Plausible.

nitram38 - 7/3/09 at 10:34 AM

Just done my noise test.....it failed....but not by much.
At idle it was 82 Dba and at 7500rpm it was 102 Dba.
So not much to lose.
Having a standard airbox probably makes all the difference.

PAUL FISHER - 7/3/09 at 01:20 PM

There was a guy at Bruntingthorpe last year with a TVR 350T,I could not believe the difference a pair of these made to the noise reduction,it passed the very strict noise levels no problem.
I think due to length of them they could prove difficult to fit on a seven type silencer,but should be ideal for your car Martin

nitram38 - 7/3/09 at 01:23 PM

Sorry Paul, a pair of what? What I suggested?

Cheers Martin

PAUL FISHER - 7/3/09 at 01:28 PM

Yes Martin,a pair of those you suggested.
He had one for each tail pipe

nitram38 - 7/3/09 at 01:38 PM

Because I only need to loose 2dB I am looking at this
I've asked if it still allows the emissions probe to go in before I buy it.

smart51 - 7/3/09 at 02:21 PM

DB killers kill power. Better to go for the extra silencer I'd have thought.

nitram38 - 7/3/09 at 02:30 PM

quote:
Originally posted by smart51
DB killers kill power. Better to go for the extra silencer I'd have thought.


It's only for sva.....and it is claimed that only a 1.5hp loss.

The only other thing is that I tested it with the arse sticking out of the garage. I might lose another 2dB once it is out in the open. Perhaps I am picking up some reflected sound?

[Edited on 7/3/2009 by nitram38]