Will tail pipe baffles impact running?
Discussion
I run a Clive y piece and a sleeved exhaust, and use track day silencers for early morning starts sometimes.
I notice no difference changing between the two set ups (performance wise), and didn’t notice any gain or decrease when sleeving the silencer so would say go ahead and do what you want!
I can’t back it up with dyno reports but on my nice healthy 400 if there is a difference, it would take Lewis Hamilton to spot it.
I notice no difference changing between the two set ups (performance wise), and didn’t notice any gain or decrease when sleeving the silencer so would say go ahead and do what you want!
I can’t back it up with dyno reports but on my nice healthy 400 if there is a difference, it would take Lewis Hamilton to spot it.
Harveybw said:
I run a Clive y piece and a sleeved exhaust, and use track day silencers for early morning starts sometimes.
I notice no difference changing between the two set ups (performance wise), and didn’t notice any gain or decrease when sleeving the silencer so would say go ahead and do what you want!
I can’t back it up with dyno reports but on my nice healthy 400 if there is a difference, it would take Lewis Hamilton to spot it.
What model of track day silencers? An you send me a link?I notice no difference changing between the two set ups (performance wise), and didn’t notice any gain or decrease when sleeving the silencer so would say go ahead and do what you want!
I can’t back it up with dyno reports but on my nice healthy 400 if there is a difference, it would take Lewis Hamilton to spot it.
twobone said:
Harveybw said:
I run a Clive y piece and a sleeved exhaust, and use track day silencers for early morning starts sometimes.
I notice no difference changing between the two set ups (performance wise), and didn’t notice any gain or decrease when sleeving the silencer so would say go ahead and do what you want!
I can’t back it up with dyno reports but on my nice healthy 400 if there is a difference, it would take Lewis Hamilton to spot it.
What model of track day silencers? An you send me a link?I notice no difference changing between the two set ups (performance wise), and didn’t notice any gain or decrease when sleeving the silencer so would say go ahead and do what you want!
I can’t back it up with dyno reports but on my nice healthy 400 if there is a difference, it would take Lewis Hamilton to spot it.
Link to track day silencers
hardly discrete, but they do the job, taking 5-7 decibels off and mellowing the sound too
A forum member called Phased uses inserts on track. They knock a few decibels and as far as I am aware don't damage performance.
If you search on his name, find one of his posts and ping him an email though the forum, he will be able to tell you what he uses and where to get it. His track day silencers are inserts, not bolt ons.
If you cannot find him, come back on here and i will ask him for you - he's a personal friend.
If you search on his name, find one of his posts and ping him an email though the forum, he will be able to tell you what he uses and where to get it. His track day silencers are inserts, not bolt ons.
If you cannot find him, come back on here and i will ask him for you - he's a personal friend.
Chimaeras sold to many overseas markets needed to meet much stricter noise regulations, so TVR had a silenced tail pipe exhaust system for these export cars.
They are of course rocking horse poo so finding a set is not going to be easy, these are mine I was lucky enough to buy for just £80 for the pair but as yet to be fitted to my Chimaera, what I really like about them is they were the right price and being original TVR equipment on export cars look completely indistinguishable from the UK spec straight through tail pipes.
Its only when you look really closely do you see the baffles, in all other respects and to the casual observer they are completely indistinguishable from the UK spec straight through tail pipes.
Before I found my silenced original export tail pipes I looked into having a set made, to achieve the same standard as the TVR ones I was looking at a minimum of £200 each so £80 for the pair worked out to be a bargain. I also looked at sleeve inserts which are fine but are not really meant to be a permanent solution, and the track day add on tail pipe silencers but these look ridiculous in my opinion so simply aren't an option for a street driven Chimaera like mine.
I'm having band clamp flanges fitted to both my standard straight through tail pipes and my export spec silenced ones making switching between the two noise levels a 10 minute job.
Ultimately the idea is to use the silenced tail pipes with cut outs so I can bypass them at a flick of a switch, or use vacuum activation so the cut out valve is allowed to open automatically when depression in the inlet manifold/plenum drops ie when I'm accelerating.
Alternatively I can create an infinitely variable electric cut out 3D calibration using my spare ECU PWM output to slowly and progressively open the cut out valves based on load vs engine speed.
Tuned correctly this would give the ultimate adaptive exhaust system and one I could activate or dedicative at the flick of a switch too.
Switch position 1 = Adaptive Off - Permanent stealth mode irrespective of load/RPM or driving style
Switch position 2 = Adaptive On - Stealth in town and below a calibration defined load/RPM threshold with the volume progressively increasing as the car is driven more aggressively
Twin kits like this that come with everything you need are available for £120 so are fairly inexpensive these days.
They are of course rocking horse poo so finding a set is not going to be easy, these are mine I was lucky enough to buy for just £80 for the pair but as yet to be fitted to my Chimaera, what I really like about them is they were the right price and being original TVR equipment on export cars look completely indistinguishable from the UK spec straight through tail pipes.
Its only when you look really closely do you see the baffles, in all other respects and to the casual observer they are completely indistinguishable from the UK spec straight through tail pipes.
Before I found my silenced original export tail pipes I looked into having a set made, to achieve the same standard as the TVR ones I was looking at a minimum of £200 each so £80 for the pair worked out to be a bargain. I also looked at sleeve inserts which are fine but are not really meant to be a permanent solution, and the track day add on tail pipe silencers but these look ridiculous in my opinion so simply aren't an option for a street driven Chimaera like mine.
I'm having band clamp flanges fitted to both my standard straight through tail pipes and my export spec silenced ones making switching between the two noise levels a 10 minute job.
Ultimately the idea is to use the silenced tail pipes with cut outs so I can bypass them at a flick of a switch, or use vacuum activation so the cut out valve is allowed to open automatically when depression in the inlet manifold/plenum drops ie when I'm accelerating.
Alternatively I can create an infinitely variable electric cut out 3D calibration using my spare ECU PWM output to slowly and progressively open the cut out valves based on load vs engine speed.
Tuned correctly this would give the ultimate adaptive exhaust system and one I could activate or dedicative at the flick of a switch too.
Switch position 1 = Adaptive Off - Permanent stealth mode irrespective of load/RPM or driving style
Switch position 2 = Adaptive On - Stealth in town and below a calibration defined load/RPM threshold with the volume progressively increasing as the car is driven more aggressively
Twin kits like this that come with everything you need are available for £120 so are fairly inexpensive these days.
Edited by ChimpOnGas on Friday 27th September 08:39
Can I suggest a practical alternative........ear plugs. Go see an audiologist and explain the issue as they can produce ear plugs that can reduce rather than block decibels into the ear canal. This type of earplug is often used by musicians to prevent damage but will have the same effect for you while allowing the rest of the world to enjoy your unmuffled TVR. It'll also be a lot less expensive than buying trackway baffles!!!
YHM.
Have a look here.
https://www.pistonheads.com/gassing/topic.asp?t=17...
Similar to Dave's above.
Send Kev a message, he had his made and fitted in Essex iirc.
Have a look here.
https://www.pistonheads.com/gassing/topic.asp?t=17...
Similar to Dave's above.
Send Kev a message, he had his made and fitted in Essex iirc.
My current setup is a full de-cat (ACT Y and pre-cats removed), this with the standard TVR silencer box and the original straight through tail pipes.
I find the above to be the perfect balance between achieving the full fat V8 sound without being too noisy, however every now and then I'm not in the mood for it and would love to be able to turn the volume down a bit so that's why I'm going with the export spec silenced tail pipes with cut outs so I can bypass them at will.
A friend who runs a V8 Morris Minor created something similar and his setup works really well, he just has his home made solenoid activated cut outs on a switch which is simple and effective.
Here's what it sounded like last weekend going up Kop Hill...
https://www.youtube.com/watch?v=vSl0qx2tqFo
Cut outs fully open of course
I find the above to be the perfect balance between achieving the full fat V8 sound without being too noisy, however every now and then I'm not in the mood for it and would love to be able to turn the volume down a bit so that's why I'm going with the export spec silenced tail pipes with cut outs so I can bypass them at will.
A friend who runs a V8 Morris Minor created something similar and his setup works really well, he just has his home made solenoid activated cut outs on a switch which is simple and effective.
Here's what it sounded like last weekend going up Kop Hill...
https://www.youtube.com/watch?v=vSl0qx2tqFo
Cut outs fully open of course
Macbags said:
Can I suggest a practical alternative........ear plugs. Go see an audiologist and explain the issue as they can produce ear plugs that can reduce rather than block decibels into the ear canal. This type of earplug is often used by musicians to prevent damage but will have the same effect for you while allowing the rest of the world to enjoy your unmuffled TVR. It'll also be a lot less expensive than buying trackway baffles!!!
This - saves a lot of bother. I have side pipes on my Ginetta , and really takes away the pleasure of opening the car up fully with a pair of gatling guns next to your ears- I spent some time messing around with reversion tubes that bounce the shock waves back into the pipe that helped, (check out DB killer on Ebay) and never saw any change in the fuelling patterns or any perceptible loss of performance with more silencing, but in the end a pair of silicone ear plugs was an easy fix for longer journeys.blitzracing said:
Macbags said:
Can I suggest a practical alternative........ear plugs. Go see an audiologist and explain the issue as they can produce ear plugs that can reduce rather than block decibels into the ear canal. This type of earplug is often used by musicians to prevent damage but will have the same effect for you while allowing the rest of the world to enjoy your unmuffled TVR. It'll also be a lot less expensive than buying trackway baffles!!!
This - saves a lot of bother. I have side pipes on my Ginetta , and really takes away the pleasure of opening the car up fully with a pair of gatling guns next to your ears- I spent some time messing around with reversion tubes that bounce the shock waves back into the pipe that helped, (check out DB killer on Ebay) and never saw any change in the fuelling patterns or any perceptible loss of performance with more silencing, but in the end a pair of silicone ear plugs was an easy fix for longer journeys.
Whilst the insertion of tailpipe silencers did not need a remap and made no difference to the actual running of the car power did get compromised. The graph gives a direct comparison with silencers fitted (black line) and silencers removed (red line) a difference of some 20bhp. That said it was much quitter to drive and the power loss is not noticeable at legal speeds so they do provide a solution to noisy cars.
I now use the slip on cans on track days so no longer have a use for the tail pipe inserts. You are welcome to borrow them and try for yourself - pm me if that's of any use to you.
The blueing of my export tail pipes tells me they are a restriction, when exhaust gasses back up they create heat.
But they were almost certainly fitted to a Chimaera with cats which means the exhaust gasses would have already been very hot even by the time they reached the tail pipes.
So with no cats on my Chim I'm hopeful my export tail pipes will not lose me too much power
But even if they do... that's where my cut outs come in to play
One thing I did try on the side pipes was running a thin metal plate down the centre of the perforated tube, but its twisted like a course screw thread to throw the exhaust gas pulses sideways into the wadding around the tube. It did work pretty well as it had very little cross sectional area to produce any back pressure. My problem was it was 3ft long, and I could not weld it in the center of the pipe so it rattled all the time, so I ended up with the db killers instead.
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