Rudymanz Posted December 22, 2007 Report Share Posted December 22, 2007 I was wondering if anyone can tell me the pros and cons of using a Y pipe setup for a dual exit exhaust and the pros and cons of using a more horizontal setup like this: http://cgi.ebay.co.uk/QUAD-3-STAINLESS-EXH...ViewItem Quote Link to comment Share on other sites More sharing options...
Ahmet Posted December 22, 2007 Report Share Posted December 22, 2007 You will probably end up loosing back pressure ..... and loosing performance rather than gaining it .. Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted December 22, 2007 Author Report Share Posted December 22, 2007 You will probably end up loosing back pressure ..... and loosing performance rather than gaining it .. Â Thanks for your response but it doesnt really answer the question properly, as you havent clarified what you are commenting on. Quote Link to comment Share on other sites More sharing options...
Tony Posted December 22, 2007 Report Share Posted December 22, 2007 The Y-pipe set-up just splits the gases between the boxes.... Whereas the link-pipe in the system you showed allows the pressure between the boxes to be equal on and off throttle. Â You should have better back pressure and shouldn't get that horrid off-throttle rasp. Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted December 22, 2007 Author Report Share Posted December 22, 2007 The Y-pipe set-up just splits the gases between the boxes.... Whereas the link-pipe in the system you showed allows the pressure between the boxes to be equal on and off throttle. You should have better back pressure and shouldn't get that horrid off-throttle rasp.  Thanks, so in conclusion, are you saying the link pipe (horizontal) setup is better than the Y pipe... or am i just confused lol? Quote Link to comment Share on other sites More sharing options...
Tony Posted December 22, 2007 Report Share Posted December 22, 2007 The Y-pipe set-up just splits the gases between the boxes.... Whereas the link-pipe in the system you showed allows the pressure between the boxes to be equal on and off throttle. You should have better back pressure and shouldn't get that horrid off-throttle rasp.  Thanks, so in conclusion, are you saying the link pipe (horizontal) setup is better than the Y pipe... or am i just confused lol? Better..... In fact on some cars the Y exists with the horizontal connector.....  As for performance gains..... The TDi team are the ones to ask Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted December 22, 2007 Author Report Share Posted December 22, 2007 The Y-pipe set-up just splits the gases between the boxes.... Whereas the link-pipe in the system you showed allows the pressure between the boxes to be equal on and off throttle. You should have better back pressure and shouldn't get that horrid off-throttle rasp.  Thanks, so in conclusion, are you saying the link pipe (horizontal) setup is better than the Y pipe... or am i just confused lol? Better..... In fact on some cars the Y exists with the horizontal connector.....  As for performance gains..... The TDi team are the ones to ask  Thanks for your quick reply Ill probably get the horizontal setup then. Who are the TDI team? Quote Link to comment Share on other sites More sharing options...
Ahmet Posted December 22, 2007 Report Share Posted December 22, 2007 Thanks for your quick reply Ill probably get the horizontal setup then. Who are the TDI team? You can find them here : http://www.wheels-inmotion.co.uk/forum/ind...hp?showforum=44 Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted December 22, 2007 Author Report Share Posted December 22, 2007 Thanks for your quick reply Ill probably get the horizontal setup then. Who are the TDI team? You can find them here : http://www.wheels-inmotion.co.uk/forum/ind...hp?showforum=44 Â Thanks Quote Link to comment Share on other sites More sharing options...
Tony Posted December 26, 2007 Report Share Posted December 26, 2007 Since one of the concerns regarding exhausts is the sound, it would be nice if you could hear it!! Â Surly in 21st century it's possible to have a sample sound? Quote Link to comment Share on other sites More sharing options...
Sam@TDi Posted December 27, 2007 Report Share Posted December 27, 2007 Hi guys sorry I've only just seen this thread. Ok firstly four stroke engines do not need or want any back pressure, at all, full stop. Â The best possible exhaust for a four stroke is a straight piece of pipe of the "correct length and diameter".... the reason that the length and diameter are so important is because it's actually the harmonic characteristic's of a four stroke exhaust are of the utmost importance. Â Arbitrarily removing boxes, changing pipe diameters will always have hit and miss results and I can count the people that I know of with the required knowledge to properly design an exhaust system on one hand. It's a bit of a black art (read- Complicated Science) I'm afraid Quote Link to comment Share on other sites More sharing options...
Tony Posted December 27, 2007 Report Share Posted December 27, 2007 Hi guys sorry I've only just seen this thread. Ok firstly four stroke engines do not need or want any back pressure, at all, full stop.  The best possible exhaust for a four stroke is a straight piece of pipe of the "correct length and diameter".... the reason that the length and diameter are so important is because it's actually the harmonic characteristic's of a four stroke exhaust are of the utmost importance.  Arbitrarily removing boxes, changing pipe diameters will always have hit and miss results and I can count the people that I know of with the required knowledge to properly design an exhaust system on one hand. It's a bit of a black art (read- Complicated Science) I'm afraid  Thanks Sam..... Curious thought incoming.... Off throttle the exhaust is subject to negative pressure (hence the Nova farts we all hear) isn't the balance pipe designed to help in this instant? Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted December 30, 2007 Author Report Share Posted December 30, 2007 Now im confused, so ill just sit back and watch and wait for a final conclusion on what setup is best for my car Quote Link to comment Share on other sites More sharing options...
Tony Posted December 30, 2007 Report Share Posted December 30, 2007 Now im confused, so ill just sit back and watch and wait for a final conclusion on what setup is best for my car  ..... I would go for the one with the balance pipe. Quote Link to comment Share on other sites More sharing options...
Sagitar Posted December 30, 2007 Report Share Posted December 30, 2007 the harmonic characteristic's of a four stroke exhaust are of the utmost importance.  It's a bit of a black art (read- Complicated Science) I'm afraid  Perhaps someone should design one with variable length - a section a bit like a trombone slide maybe - and a linear motor so it could be adjusted while driving.  Then you could make it play whatever note you liked . . . . . . . .  A Happy New Year Sam. Quote Link to comment Share on other sites More sharing options...
Sagitar Posted December 30, 2007 Report Share Posted December 30, 2007 Curses - they've already done it . . . . . . . Â Â Title: Variable exhaust system for an internal combustion engine Document Type and Number: United States Patent 5271224 Link to this page: http://www.freepatentsonline.com/5271224.html Abstract: A dynamically variable exhaust system provides for maximum efficiency of an internal combustion engine (30) by including an exhaust control device (35) which is operated by a control mechanism (33) and managed by a control unit (32). The length and cross-sectional area of the exhaust header section (36) can be varied by transversely displacing the effective exhaust passage within control device (35) while maintaining a streamlined profile of the effective passage throughout a predetermined range of displacement. The control unit (32) can be influenced by numerous operational inputs including control device position potentiometer (40), engine speed input (41), engine load input (42), vehicle braking sensor (43), exhaust emission and temperature sensor (44), and engine management system input (45). Inventors: Cruickshank, Ronald W. (460 Quail Ridge Dr., Westmont, IL, 60559) Application Number: 07/977540 Filing Date: 11/17/1992 Publication Date: 12/21/1993 Quote Link to comment Share on other sites More sharing options...
Tony Posted December 30, 2007 Report Share Posted December 30, 2007 Whatever next Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted December 31, 2007 Author Report Share Posted December 31, 2007 Now im confused, so ill just sit back and watch and wait for a final conclusion on what setup is best for my car  ..... I would go for the one with the balance pipe.  I have now agreed a price for the one i want will be buying it on the 7th so unless some more info is given to why i shouldnt get it, then its a done deal Quote Link to comment Share on other sites More sharing options...
Tony Posted December 31, 2007 Report Share Posted December 31, 2007 Now im confused, so ill just sit back and watch and wait for a final conclusion on what setup is best for my car  ..... I would go for the one with the balance pipe.  I have now agreed a price for the one i want will be buying it on the 7th so unless some more info is given to why i shouldnt get it, then its a done deal  Deal in my opinion Quote Link to comment Share on other sites More sharing options...
Sam@TDi Posted January 2, 2008 Report Share Posted January 2, 2008 the harmonic characteristic's of a four stroke exhaust are of the utmost importance.  It's a bit of a black art (read- Complicated Science) I'm afraid  Perhaps someone should design one with variable length - a section a bit like a trombone slide maybe - and a linear motor so it could be adjusted while driving.  Then you could make it play whatever note you liked . . . . . . . .  A Happy New Year Sam.  And a Happy new year to you  Variable length exhaust runner designs have been around almost as long as the internal combustion engine. Often for road cars it's easier to tune the exhaust so that neither peak negative or positive harmonics are in the engines frequency range.  Intake harmonics are even more important, variable length intakes runners are used to great effect in loads and loads of modern cars, probably best demonstrated in the Audi 4.2 V8 which boasts 80% of peak torque available from just 2000rpm. Thanks in no small part to it's 3stage variable length intake manifold design.  Regarding the MX5 exhaust there is too little information here to make any kind of informed decision so it'll be a "suck it and see" I'm afraid Quote Link to comment Share on other sites More sharing options...
TDIPLC Posted January 2, 2008 Report Share Posted January 2, 2008 the harmonic characteristic's of a four stroke exhaust are of the utmost importance.  It's a bit of a black art (read- Complicated Science) I'm afraid  Perhaps someone should design one with variable length - a section a bit like a trombone slide maybe - and a linear motor so it could be adjusted while driving.  Then you could make it play whatever note you liked . . . . . . . .  A Happy New Year Sam.  I had a Yamaha 1000cc motor bike back in about 1990 that had a similar system called "Exup" which was an electrically controlled valve in the exhaust collector which optimised the torque curve for different engine speeds Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted January 3, 2008 Author Report Share Posted January 3, 2008 When fitting a universal exhaust and fitting using a camp, do you need to treat the part of the exhaust that has been cut? (i dont think so, just want to make sure before ordering it) Thanks Anthony Quote Link to comment Share on other sites More sharing options...
Tony Posted January 3, 2008 Report Share Posted January 3, 2008 When fitting a universal exhaust and fitting using a camp, do you need to treat the part of the exhaust that has been cut? (i dont think so, just want to make sure before ordering it)Thanks Anthony  No you don't. Quote Link to comment Share on other sites More sharing options...
Rudymanz Posted January 3, 2008 Author Report Share Posted January 3, 2008 Thanks Tony. one more question, does anyone know any type/where i can get of universal exhaust heat shield type of thing i can put on the bumper when i cut the other side out, just to make things looks tidy and even? Quote Link to comment Share on other sites More sharing options...
ROB Posted January 3, 2008 Report Share Posted January 3, 2008 u can get that sort of thing from halfrauds but i think they look very chav Quote Link to comment Share on other sites More sharing options...
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