68 replies to this topic

[Jetpilot]

Hi guys, having done some reading and searching about exhausts it seems db readings can be a problem, static at Combe I am 98db and not tripping the drive by. I am thinking of booking Goodwood which it seems may be a problem. I have a Tullet which I presume is 3" due to being a fair bit over 300hp. Any opinions on shaving a couple of db, repacking, modified turbo back box, dave hardwick back box, single tail pipe?

[CHILL Gone DUTCH]

Think maxR uses a 3" Tullet and has been on castle comb To be sure it's 3" system don't measure the tips measure the actual exhaust part

[smiley]

A baffeled backbox seems to be the most efficient as noise filtering.

Attach a stock turbo backbox, and leave the rest as it is.

Weather the baffels will survive is another question. Not enough experience has been made to verify. 

 

If you have a 3" system, you may struggle attaching it, as tullett mentions it´s a complete custom system.

Edited by smiley, 08 August 2016 - 07:41 AM.

[MAXR]

Think maxR uses a 3" Tullet and has been on castle comb To be sure it's 3" system don't measure the tips measure the actual exhaust part

 

I actually have a bit of a pick & mix exhaust setup 3" 2ubular manifold & collector & two tullet rear silencers going into a 3" single pipe by another company.

 

I'm doing 101db statics. packing material lasts a track day at two at most. that's with tullet's higest rated packing. i'm not sure why I lose so much?

 

I'v now got a different enclosed airbox which I hope will allow me to do Bedford & also db killer just for static test & then I remove it as apparently sticking one in a single tailpipe causes excessive heat build up in head if left in on prolonged use.

 

If you find a solution, let me know.

[smiley]

 

I'm doing 101db statics. packing material lasts a track day at two at most. that's with tullet's higest rated packing. i'm not sure why I lose so much?

 

 

A lot of people are suffering from that. Exact cause is unknown for now. (resonation  or to rich mixture burning it)

One of the Dutch recently took a different approach then to keep adding tullett stuff.

 

His exhaust specialist uses a 2 layer approach. From vendor www.powersprint.eu, the first layer is steel wool that can take 1200 degrees. (SSF-HT) 

The second layer is comparable padding as to the acoustafill. His version is called "1000 plus", rated to 1000 degrees. (acoustafil PTX is rated to 800 degrees, and acoustafil ZT1 is rated to 900 degrees)

 

As it is in very recently, there are no reports on the padding consumption yet.

His 3" is pretty quite though.   

https://youtu.be/GztGNUpry44 https://youtu.be/499zPcR5k9w

(the red one with the BGW. 360 harrop system)

Edited by smiley, 08 August 2016 - 10:02 AM.

[MAXR]

Cheers Smiley, I'll try that next. Is there a particular way we packs it?

 

Max

[Jetpilot]

Thanks guys, so my reading at 98db at Combe isnt that bad in comparison to Max.

 

I have had a bit of experience with exhausts in the past and was always under the assumption that they should have a layer of steel wool first, then the actual exhaust wadding.

 

I will measure up the pipework first, but dont think i would achieve the 370hp that it has on a 2.5".

 

I am quite happy to use a db killer but would this not mess up my afr ratios and possibly cause damage?

[smiley]

Cheers Smiley, I'll try that next. Is there a particular way we packs it?

 

Max

 

We would have to ask the powersprint vendor. Here is their sales pitch: http://www.powerspri.../edelstahlwolle

Edited by smiley, 08 August 2016 - 11:11 AM.

[Jetpilot]

Reading that do i presume they are entirely using this with no fiber wadding, just ss?

[techieboy]

Ermmmm, no.  

His exhaust specialist uses a 2 layer approach. From vendor www.powersprint.eu, the first layer is steel wool that can take 1200 degrees. (SSF-HT)  The second layer is comparable padding as to the acoustafill. His version is called "1000 plus", rated to 1000 degrees. (acoustafil PTX is rated to 800 degrees, and acoustafil ZT1 is rated to 900 degrees)

[Jetpilot]

In  Schalldämpferbau  stainless steel wool is mainly used as the coating of absorption pipes.Thus, the blow to the  insulation materials  such as E-glass or basalt wool be prevented. But it is also increasingly becoming Befüllender absorption chambers of high performance silencers

 

If i could work out what befullender means it would help but it sounds like its being used throughout, although i do appreciate the "two part" system bit, although as above thought that was common place in exhausts.

Edited by Jetpilot, 08 August 2016 - 11:18 AM.

[CHILL Gone DUTCH]

Think maxR uses a 3" Tullet and has been on castle comb To be sure it's 3" system don't measure the tips measure the actual exhaust part

  I actually have a bit of a pick & mix exhaust setup 3" 2ubular manifold & collector & two tullet rear silencers going into a 3" single pipe by another company.   I'm doing 101db statics. packing material lasts a track day at two at most. that's with tullet's higest rated packing. i'm not sure why I lose so much?   I'v now got a different enclosed airbox which I hope will allow me to do Bedford & also db killer just for static test & then I remove it as apparently sticking one in a single tailpipe causes excessive heat build up in head if left in on prolonged use.   If you find a solution, let me know.

Mine didn't last much longer when I took the layer of wire wool out from the perferated tube I now have put the wire wool back in The exhaust is louder this way but can't warrant the wadding lasting 1-2 track days between replacing it My static is around 98 Db with wire wool

[smiley]

The 2 layer system was from the exhaust builder that build a custom muffler for the Dutch guy.

That could deviate from the advice of the actual vendor of the stuff.

 

We would just have to ask the vendor what the best approach would be.

(as I fail to see just how steel wool alone would absorb sound, but that could be just me)

Edited by smiley, 08 August 2016 - 11:34 AM.

[CHILL Gone DUTCH]

What is your build spec jet pilot

[CHILL Gone DUTCH]

Wire wool is just used to keep the wadding from absorbing more heat / sound and stop it falling out

[Jetpilot]

What is your build spec jet pilot

 

 

http://www.vx220.org...upercharged-22/

 

So according to the build it is a 3" Tullet.

Edited by Jetpilot, 08 August 2016 - 12:59 PM.

[CHILL Gone DUTCH]

as your running a harrop and high power a turbo back box will be useless to you single exit helps a little as would a db reducer but this costs hp 

 

welcome to harrop sc problems 

 

is your car running a CS map or obdtuner 

[Jetpilot]

CS map

[smiley]

Ultimate (Germany) was running a turbo backbox on his harrop and 3"system.

Contact him on backpressure. (He also does not track his car afaik)

[Jetpilot]

Thanks Smiley, i will send him a pm.

 

Going back through old threads i am aware its an issue, trouble is for me, seems pointless having a track car if i am going to struggle at some of them to meet db's, i would sacrifice a few hp for something a little quieter.

 

Going back through older threads do i presume there isnt a lot of difference between Dave Hardwick exhausts and Tullets, there seems to be no conclusive outcome.