Pork Chops Posted 30July, 2017 Report Share Posted 30July, 2017 You know. It's loud and throaty and then you hit a button and it's all tame and quiet.Any idea of how this could be done? Done it before yourself? Know someone who sells a kit? I've got some ideas but yours are most welcome too. Link to comment Share on other sites More sharing options...
Russ Posted 30July, 2017 Report Share Posted 30July, 2017 exhaust on both sides of the muffler and a switch on one side, either puts the exhaust straight out one pipe, or switches it through the muffler and out the other pipe Link to comment Share on other sites More sharing options...
Pork Chops Posted 30July, 2017 Author Report Share Posted 30July, 2017 exhaust on both sides of the muffler and a switch on one side, either puts the exhaust straight out one pipe, or switches it through the muffler and out the other pipeYou mean like this? What switches? Electric? Mechanical? Located where? I'm concerned they may not last long so close to the headers, and especially if electric.Any pics of a system, or details of components or layouts?Cheers. Link to comment Share on other sites More sharing options...
Raven Posted 30July, 2017 Report Share Posted 30July, 2017 On the the Current Porsche cars with PSE I believe that vacuum diaphragms are used to activate the flaps in the mufflers that open and close ...the vacuum is then controlled by an electric switch or solenoid that allows it to go to the actuator diaphragms on the mufflers... Link to comment Share on other sites More sharing options...
DJM Posted 30July, 2017 Report Share Posted 30July, 2017 Leave it loud and save the hassle. Who wants a quiet hotrod. It's meant to be anti social ?? Link to comment Share on other sites More sharing options...
MFX Posted 30July, 2017 Report Share Posted 30July, 2017 I have thought about doing the same thing. You can get the valves reasonably cheap on ebay. You can either get ones with a cable type set up, which you can pull to cord in the cabin, or get the electric ones. The main issue I see with them is all they basically do is block off a lot of the exhaust flow (basically like a throttle body). I worry about how much this effects power when it is quiet, by creating a heap of restriction. You could reasonably easily put them into your car like the diagram you have shown, only the extra mufflers would not be there. Just thinking about it a bit further. If I did it again, I could have probably installed a valve internally inside my muffler so that basically the exhaust can always travel out of the left exit, and the valve would open up the second exit to give it more noise. I am not sure if I can be bothered opening it up again and doing it now though. If My current mod is too loud I might consider it. Link to comment Share on other sites More sharing options...
Raven Posted 30July, 2017 Report Share Posted 30July, 2017 Yeh a muffler like your rear can style would be quite easy to install a valve into that opens and closes to direct gas,s out one side or both ,,the thing is like DJM said is it worth all the trouble when your early 70,s hot rods are meant to be noisy ,,,if I had PSE on my 997 I would set it up to be on all the time ,,as it is I have Fister D mufflers and they do that anyway and are at a volume not over loud but loud enough to make you feel good about the sound it makes ..I am certain your car will sound really good due to the ITB induction noise ,,,I would not worry about the exhaust until the car has been up and running for a period of time ,,,its not hard to modify or change out the type of muffler you are using as you know ..I am very keen on hearing Neills RSR replica fire up his exhaust system looks very similar what is on the SINGER cars less the two side mufflers and should sound really wild ... Link to comment Share on other sites More sharing options...
81SC Posted 30July, 2017 Report Share Posted 30July, 2017 Link to comment Share on other sites More sharing options...
Pork Chops Posted 30July, 2017 Author Report Share Posted 30July, 2017 details please Link to comment Share on other sites More sharing options...
Raven Posted 30July, 2017 Report Share Posted 30July, 2017 That set up would be loud as hell as it looks like when the valves are open the exhaust gas,s are literally going straight through the muffler ,,,would be like a full open exhaust system with zero baffling .............ear plugs required ? Link to comment Share on other sites More sharing options...
MFX Posted 30July, 2017 Report Share Posted 30July, 2017 I have been stewing on this for the past couple of hours now and I have figured out how I can do it to my exhaust by only cutting into the back of one end of one side of the exhaust and installing the valve. I suppose the main thing for yours Nick, is what exhaust/muffler do you currently have? The internal design of that muffler would effect how it can be modified. If it is that same as mine, I can send you my ideas and you could possibly get some one to build it down there for you. Link to comment Share on other sites More sharing options...
Russ Posted 31July, 2017 Report Share Posted 31July, 2017 i just threw out a Varex with the valve etc in it, I figured i'd never sell it Link to comment Share on other sites More sharing options...
Coastr Posted 31July, 2017 Report Share Posted 31July, 2017 HSVs have had this thing for a while - how does the valve work in those mufflers?I'm guessing the design is just about making the gas flow through a different route. If worried about restriction the closed valve would let the exhaust go the 'normal' way, and the open valve is a bypass which would leave the 'normal' way stil lthere but let the gas out a less restrictive way, just like a wastegate. I smell an aftermarket parts business opportunity by the amount of lurking in this post. Link to comment Share on other sites More sharing options...
Pork Chops Posted 1August, 2017 Author Report Share Posted 1August, 2017 Coastr is onto it. I agree, and so does Monty, so he's going to have a crack at designing something for me. I'll be his R&D guinea pig. He'll be following this thread so why not express interest here so he can gauge the level of demand there may be. Link to comment Share on other sites More sharing options...
81SC Posted 1August, 2017 Report Share Posted 1August, 2017 details please http://www.ddk-online.com/phpBB2/viewtopic.php?f=1&t=29976Happy reading Porky Link to comment Share on other sites More sharing options...
Raven Posted 1August, 2017 Report Share Posted 1August, 2017 That is an interesting read 81sc thank you for sharing that great info with back to back dyno runs to back up the numbers ............. Link to comment Share on other sites More sharing options...
Pork Chops Posted 1August, 2017 Author Report Share Posted 1August, 2017 http://www.ddk-online.com/phpBB2/viewtopic.php?f=1&t=29976Happy reading Porky Thanks. I'll be knocking myself out later. Good find. Link to comment Share on other sites More sharing options...
Coastr Posted 1August, 2017 Report Share Posted 1August, 2017 All that noise difference for 1hp! Link to comment Share on other sites More sharing options...
Pork Chops Posted 2August, 2017 Author Report Share Posted 2August, 2017 All that noise difference for 1hp!It's an excellent result but 2,800 GBP plus shipping etc and no details on how the system works apart from at the beginning of the thread where it's a case of reaching under the car and switching the valve. Not sure if that's as far as they went or if they're protecting IP. Link to comment Share on other sites More sharing options...
Raven Posted 2August, 2017 Report Share Posted 2August, 2017 Mate for that sort of coin I think you could get something made locally from an exhaust or race fabrication shop and still have some change left over .. Link to comment Share on other sites More sharing options...
michel Posted 4August, 2017 Report Share Posted 4August, 2017 why not just use tried and true and cap off the outlets on a 3 out Link to comment Share on other sites More sharing options...
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