SOHC Posted February 16, 2017 Share Posted February 16, 2017 This is my home made muffler I made, it sounded like diarrhea spraying over a tin hut, I removed it after 100kms 6 1 Quote Link to comment Share on other sites More sharing options...
SOHC Posted February 16, 2017 Share Posted February 16, 2017 On 12/02/2017 at 22:02, fishtailfred said: Sohc, excuse my laziness and link a thread about your chosen Volvo fettish participant? Cheers. Sorry no such link exists, I don't realy do any interesting work on it Quote Link to comment Share on other sites More sharing options...
scooters Posted July 30, 2017 Share Posted July 30, 2017 vw "muffler" megaphone thingy. no idea how it works. Also... not a real muffler 2 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted July 30, 2017 Share Posted July 30, 2017 @64vauxhall 2 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 30, 2017 Share Posted July 30, 2017 16 minutes ago, scooters said: vw "muffler" megaphone thingy. no idea how it works. Also... not a real muffler As the exhaust gasses expand in the megaphone it creates a vacuum behind the exhaust pulse which improves scavenging, creating more power. Or something. Maybe it just makes it real loud to create a false perception of more power. 6 Quote Link to comment Share on other sites More sharing options...
scooters Posted July 30, 2017 Share Posted July 30, 2017 Just now, Firetruck said: As the exhaust gasses expand in the megaphone it creates a vacuum behind the exhaust pulse which improves scavenging, creating more power. Or something. Maybe it just makes it real loud to create a false perception of more power. They make ears bleed. Its along the lines of a exspansion chamber but not. 4 stroke injected dirt bikes have a power bomb or some shit a little bulge in the exhaust. Quote Link to comment Share on other sites More sharing options...
Truenotch Posted August 11, 2017 Author Share Posted August 11, 2017 @Firetruck is right - as the high pressure pulses expand into the collector/megaphone area they slow down and create a vacuum which helps to draw exhaust gasses out of other cylinders. At the same time there is a sound wave that bounces back in the other direction towards the valve. This is also known as a mindfuck. 5 Quote Link to comment Share on other sites More sharing options...
Truenotch Posted August 11, 2017 Author Share Posted August 11, 2017 Watch this if you've got half an hour spare (you do). He explains the theory fairly well. 3 Quote Link to comment Share on other sites More sharing options...
oldrx Posted August 23, 2017 Share Posted August 23, 2017 On 11/08/2017 at 14:38, Truenotch said: @Firetruck is right - as the high pressure pulses expand into the collector/megaphone area they slow down and create a vacuum which helps to draw exhaust gasses out of other cylinders. At the same time there is a sound wave that bounces back in the other direction towards the valve. This is also known as a mindfuck. More of a negative pressure wave (from my limited understanding), being negative it travels towards the engine but draws exhaust gas out of the chamber aiding scavenging 1 Quote Link to comment Share on other sites More sharing options...
Jorden Posted October 15, 2017 Share Posted October 15, 2017 I'm about to build the exhaust for my new v8. It is a 393, at a guestimate 550 hp at the crank. I have to run a single system in the xf as the fuel tank gets in the way on the passengers side. It'll just be running through one flowmaster super 44. I have twin 3" collectors, what size system is going to be best? Quote Link to comment Share on other sites More sharing options...
SOHC Posted October 16, 2017 Share Posted October 16, 2017 19 hours ago, Jorden said: I'm about to build the exhaust for my new v8. It is a 393, at a guestimate 550 hp at the crank. I have to run a single system in the xf as the fuel tank gets in the way on the passengers side. It'll just be running through one flowmaster super 44. I have twin 3" collectors, what size system is going to be best? I would say one 3" will be more than enough, I did have a 3" on my XF v8, it fitted ok, there is enough room, it was 3" from the collectors then merged into one 3" with a 50 series flowmaster in front of the diff 1 Quote Link to comment Share on other sites More sharing options...
Testament Posted October 16, 2017 Share Posted October 16, 2017 will work If you can't fit bigger but single 3" at that power level will be choking things somewhat. 3.5" has significantly more area you can make it fit. Or oval/rectangular is another option, you need about 50mm x 150mm to match the area of 3.5"/90mm tube Quote Link to comment Share on other sites More sharing options...
Jorden Posted October 16, 2017 Share Posted October 16, 2017 Yea I should be able to fit 3.5" under there, the headers sit fairly low so it'll sit above the level of those, and I can tuck it in the tunnel a bit. So 3" at worst, 3.5 is better, and if I could fit 4" would that be the best? Quote Link to comment Share on other sites More sharing options...
cletus Posted October 17, 2017 Share Posted October 17, 2017 Are you bothered about noise/ drone/ being legal etc? 1 1 Quote Link to comment Share on other sites More sharing options...
Jorden Posted October 17, 2017 Share Posted October 17, 2017 2 hours ago, cletus said: Are you bothered about noise/ drone/ being legal etc? Negative Whatever is going to get the most out of the engine Quote Link to comment Share on other sites More sharing options...
SOHC Posted October 17, 2017 Share Posted October 17, 2017 56 minutes ago, Jorden said: Negative Whatever is going to get the most out of the engine How about having both 3" headers poking out just behind the front wheels but capped off then twin 2.5" with mufflers? 2 Quote Link to comment Share on other sites More sharing options...
Truenotch Posted October 17, 2017 Author Share Posted October 17, 2017 In the video above, the engineer from Magnaflow says 500hp is the changeover point to step up to 3" exhausts... For each bank. So I'd say go 4" if it'll fit (if you're doing a single system). 2 Quote Link to comment Share on other sites More sharing options...
cletus Posted October 17, 2017 Share Posted October 17, 2017 3 hours ago, Jorden said: Negative Whatever is going to get the most out of the engine In that case, twin 3" with two of those flowmasters would sound good, and dump it at the diff. Then if you need to, for wof time etc, you could make a pipe after the diff that joins the two together and goes out the back. You could make that smaller, put a muffler in it, or even use the standard tailpipe Quote Link to comment Share on other sites More sharing options...
cletus Posted October 17, 2017 Share Posted October 17, 2017 Also what old mate from magna flow sez sounds right I had a 50 series flow master on my car and it was loud ish at idle but went quiet under boost I biffed that and put a stainless packed china straight thru muffler on it and it dropped 2db at idle, sounded better at wot, and made another psi of boost 2 Quote Link to comment Share on other sites More sharing options...
Carsnz123 Posted October 22, 2017 Share Posted October 22, 2017 Any good ideas for a twin exhaust system for a L26? I want my Cedric to roar like a Z when I bury the noisey pedal but still cruise at 100 nicely. Quote Link to comment Share on other sites More sharing options...
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