Sadly Jim I failed the drive by last time out at Donny, I have a cunning plan I’d like to discuss with you? I must find some time to call…
[quote=SeanB]Ive said it 500 times and i will say it again, repackable, repackable, repackable!!!
We have some lovely ones made, call John! [/quote]
Hmm, nice bit of hi-jack/opportunism there Sean 
Never been keen on re-packable silencers after my experience with a numpty called Uldis. Packing a can is THE most obnoxious job and I’d rather my customers didn’t have to do it.
I use re-packable silencers during the R&D stage - here’s the innards of Ali Crozier’s 111R silencer after 13,000 miles including numerous trackdays in the UK and Nurburgring/Spa.
If you use the correct materials, you shouldn’t need to re-pack a silencer on these cars - we’re in the 21st century now, there’s some amazing science/technology out there - expensive though. You see how CLEAN that Acoustafil is? I’ve NEVER seen a sooted up silencer on the Lotus - just doesn’t happen.
To me, a re-packable silencer would be the gift that keeps on giving - a bit like an ink-jet printer. Sell the silencer at cost and reap the profits on the re-packs. Why bother with the expensive materials - he knows it’s re-packable anyway, right?
I have e-mails begging me to re-pack a certain manufacturer’s silencers because they’re done after one trackday. I’ve had a couple back to me because I was …curious. Even empty, they’re HEAVY because the Hank Bush needed for fixing the end-cap needs a grip on some thickness of skin. Typically 1.6mm - I use 0.8mm for lightness - it’s enough.
The ONLY install which gives me consistent problems is the Honda SC - more to do with the mapping I think because they reek of fuel when I cut them open for a look-see. I’m working my way through them with the new trackday silencer design and feedback is good.
What were the readings? - I need to know these things!
No thread hijack meant Jim, we are simply talking exhausts.
Every exhaust I have come across, including yours, get louder with age, FACT In my experience!
And as far as “the gift that keeps on giving” I dont reckon �10 on packing materials (what I have paid in the past) once or twice a year is a bad price to pay, when being kicked off a �150+ track day is the alternative.
I agree that repacking a silencer isn’t the nicest job, but its hardly the worst thing in the world.
[quote=SeanB]No thread hijack meant Jim, we are simply talking exhausts.
Every exhaust I have come across, including yours, get louder with age, FACT In my experience!
And as far as “the gift that keeps on giving” I dont reckon �10 on packing materials (what I have paid in the past) once or twice a year is a bad price to pay, when being kicked off a �150+ track day is the alternative.
I agree that repacking a silencer isn’t the nicest job, but its hardly the worst thing in the world. [/quote]
Nearly 2000 exhausts made for the Elise/Exige, FACT. I don’t have many complaints. Steve’s problem isn’t the packing, he’s running a de-cat. Some of the complaints you’re talking about are from owners who’ve upgraded to the CN re-flash - more power = more NOISE.
From what I’ve seen here and in the US, the packing material used in the re-packables is cheap fibreglass wadding - one trackday on an SC and it’s toast.
I’ve seen numerous re-packables scrapped because the cack-handed owner stripped the threads on the fixings. What material are you using for packing. What feedback do you have from hi-power SC installs?
Oh, and btw IMO your post was a blatant hi-jack/sell.
Here’s a thought. Get your new re-packable system on to Steve’s install - let’s see how long it lasts.
Jim, I aint gonna argue with ya.
I cant remember the name of the stuff i used in my silencers, but it wasn’t fibreglass wadding.
Jim, my reading at Donny were 102db drive by, however the wind direction was very odd and there were loads of cars that usually pass getting black flagged, even with that in mind I still think I would fail. I was trying to find out if it really was exhaust noise or induction noise, but they seem unable to tell you if you were heading towards the mike or driving past it when you peaked it 
Just curious , is there packing in the chambered exhaust too such as mine Jim ?
…Still faultless I might add …
[quote=SeanB]Jim, I aint gonna argue with ya.
I cant remember the name of the stuff i used in my silencers, but it wasn’t fibreglass wadding. [/quote]
�10/pack of anything isn’t going to last long inside a +300bhp SC install - FACT. You’re selling a product - I find that most owners these days don’t even know the questions to ask - here’s a start;
What installs have you tested on?
How long between re-fills on each install?
What dimensions are your silencers?
What weight for each silencer size?
Your turbo (or any N/A install) is a pussycat on exhaust packing - the hi-powered SC is the challenge - how many owners have tried your re-packables and what’s the feedback?
You’ve got your fan-boys on here and you like to talk-the-talk. Time to walk-the-walk mate.
[quote=jfk]Just curious , is there packing in the chambered exhaust too such as mine Jim ?
…Still faultless I might add … [/quote]
The central section still has packing John - those systems are working really well. There’s a lot of European race teams using them now and the fact that there’s no need to re-pack is a winner with them.
Jesus fucking christ Jim, I’ve properly rattled your cage haven’t I.
Not my intention by the way.
As you and everybody else knows, we are not an exhaust company, but we have several suppliers that make exhausts on our behalf for different applications as and when the need arises and we always spec a re-packable silencer.
The main reason for this came from a Honda SC race car (about 350BHP) that we ran for a good few years that would blow the packing out after only a few race weekends. We consulted the companies we worked with and tried a good few different types of packing. I agree with you in that it could have been a mapping issue making the EGT’s too high. But the bottom line was, we were repacking the silencers every couple of race meetings.
This has just led us to be cautious and always fit repackable silencers, as failing the noise test at a race weekend or track day for that matter is a problem that nobody wants.
My turbo install hasn’t been so much of a problem, but it does get louder over time and I have repacked it several times, probably once a year. My old exhaust was a Chris Tullet job and i would buy the packing from him. It was white and fluffy and came in a plastic bag and that is all I can tell you about it
I can honestly say I have never come across an exhaust on a Lotus that doesn’t get louder over time (and if you think different lets just agree to disagree). Several of the guys on here have stated the same, with all different types of exhausts.
So to conclude, we both think big power SC’d cars are hard on exhausts, so I say again, why not simply make the exhaust repackable???
Are EGT’s typically higher on high power SC’s than high power turbo applications?
Just curious.
What were the readings? - I need to know these things! [/quote]
Hi Jim
My car also failed at Donny - 101.5 db - that’s the std 2bular exhaust, no decat. My car’s a 260 Cup if that helps
My car is 92.5db at Donny, full 2bular system. I say you all bin your superchargers and go NA 
NAROCKS 
The day Ade and Chris both failed was a strange one weather wise and neither car seemed overly loud from the pit wall. I’ve heard Ade’s car many times when using the old system and it was truly epic but the noise is clearly suppressed now in comparison.
^^^ someone shoot him ^^^
My Yaris is also quiet
Wow, how did I miss this thread? 
Off to look for popcorn + crab cakes
[quote=Boothy]Wow, how did I miss this thread?
Off to look for popcorn + crab cakes [/quote]
You’re OK to pop out for provisions - the actions just getting started !!!
Just make sure the popcorn machine has plenty of packing otherwise you may have a noise issue
And I can cook ya popcorn to perfection at 55 degrees !!!
[quote=chrisexigegt]
Just make sure the popcorn machine has plenty of packing otherwise you may have a noise issue [/quote]
Or pack your exhaust with popcorn! I bet that would smell nice after a spot of over fueling