Guest brickst3r Posted March 26, 2015 Share Posted March 26, 2015 Anyone here have the Termignoni exhaust yet? I'm either considering that or the Akrapovic carbon/titanium. I think it'll be down to those 3 but just not sure what i want yet. Link to comment Share on other sites More sharing options...
jbird Posted March 26, 2015 Share Posted March 26, 2015 Akra carbon it looks nasty on this bike, it's so fucking sweet Link to comment Share on other sites More sharing options...
Guest brickst3r Posted March 26, 2015 Share Posted March 26, 2015 do you know why they added the extra loop on the akra carbon right before the muffler? the termignoni is a straight pipe all the way to the muffler. I don't know much about exhaust pipes and stuff so not sure why they added the loop. Link to comment Share on other sites More sharing options...
Premium Member snowdriftless Posted March 26, 2015 Premium Member Share Posted March 26, 2015 This has already been discussed: Akrapovic Carbon exhaust Dewski, To answer the question, why the loop? I was told the AK Carbon was engineered that way to increase back pressure to compensate for the short length of pipe and muffler. P1: Vice? I have no vice, I'm as pure as the driven snow! P2: Yeah but you've been drifting All the gear all the time! Link to comment Share on other sites More sharing options...
jbird Posted March 26, 2015 Share Posted March 26, 2015 Send link for the thread on the loop engineering Link to comment Share on other sites More sharing options...
partysub Posted March 28, 2015 Share Posted March 28, 2015 I have the termignoni sitting in my garage waiting to be installed. I'll post a review once I get it installed hopefully this weekend. Link to comment Share on other sites More sharing options...
USMCFieldMP Posted March 30, 2015 Share Posted March 30, 2015 For those leary of the "loop" that the Akrapovic Carbon has, realize that some MotoGP bikes run/have run their exhausts/parts of their exhausts like that. Link to comment Share on other sites More sharing options...
Guest brickst3r Posted April 12, 2015 Share Posted April 12, 2015 Those welds on the loop look amazing with the bluish color. Link to comment Share on other sites More sharing options...
aeisan Posted April 13, 2015 Share Posted April 13, 2015 I don't know why it gets under my skin when people refer to a motorcycle exhaust needing "back pressure" but it does... It's just a fallacy; or at best a misnomer. Back pressure, literally the actual back pressure, is not desirable characteristic of any ideal exhaust. The whole point of an exhaust system is to exhaust the resultant gases from the combustion cycles out of the motor. To do this, there is a specific velocity that is ideal for each system. You don't want too much or too little else you loose torque and power. Thus, the loop is there to achieve the desired exhaust velocity - not back pressure. Every bend, weld, inch of pipe, pipe diameter, pipe wall thickness (because it effects the way the pipes expand/contract when heated/cooled)baffle, etc. play into how the exhaust velocity is achieved and it's all there because the engineers want it there. Just because some systems have the loop and some don't does not mean one is right and one is wrong - they were just engineered differently and you have to take the entire system into account, not just one bend or loop. Life is good on 2 wheels! Link to comment Share on other sites More sharing options...
pattonme Posted April 13, 2015 Share Posted April 13, 2015 well, if we want to split hairs "back pressure" IS desirable (to a point) since it's the reflected wave form that helps scavenge the cylinder. As soon as the diameter of a pipe changes you get a reflected wave. When the gas hits the canister entrance (and exit) reflected waves are sent back to the exhaust port. These wave fronts going the "wrong" way are indeed back pressure as they run into the next puff of exhaust trying to get out. The length of the pipes is used to tune the timing of these waves. Acro knows their stuff and a twin REALLY benefits from longer headers but given the limited packaging options they did the best they could by putting in the loops to get another 10 inches or so. The "barrel" shape is also deliberately engineered to help with gas flow dynamics. Link to comment Share on other sites More sharing options...
aeisan Posted April 13, 2015 Share Posted April 13, 2015 Thanks for the correction! Great point... I guess you're right in that it would help the scavenging, but it's not the only factor if I understand things correctly. That said - I'm no expert in gas dynamics ha, just a structural guy that took enough fluid and thermal dynamics to be dangerous. You did, however, help reiterate my main point I wanted to make to others - which is don't judge a book by its cover. I get the feeling not a lot of people realize how truly complicated the engineering is that goes into these (and any) bikes and that everything is there for a reason. Life is good on 2 wheels! Link to comment Share on other sites More sharing options...
pattonme Posted April 13, 2015 Share Posted April 13, 2015 > how truly complicated the engineering is that goes into these Just wish yamaha would spend the time on the dyno putting a fuel map together that wasn't total shite. Link to comment Share on other sites More sharing options...
bigity Posted May 31, 2015 Share Posted May 31, 2015 In response to the OP, after 7 months of Yoshi on my Fizzy, I just bought a Termignoni..... Link to comment Share on other sites More sharing options...
blueangel Posted June 2, 2015 Share Posted June 2, 2015 I just ordered the Termignoni from Carpimoto. Really looking forward to receiving it. Link to comment Share on other sites More sharing options...
vertigo Posted June 2, 2015 Share Posted June 2, 2015 Cue countdown until someone has a story of a bystander asking why they have "exhaust from one of those dew catties on yer Jap bike..." Link to comment Share on other sites More sharing options...
gregjet Posted June 2, 2015 Share Posted June 2, 2015 I am beginning to really like this forum. Actual informed arguements and points. Sorry but I have to add this to this thread and YES I have posted it before. As several pointed out above, it is the pressure waves and their behaviour that is the reason to change to an exhaust that allows these to do their job. I won't go into a long explanation but this bike is at a serious disadvantage when attempting to use additive scavenging ( each cyl pulse helping the other/s extract and reflow). The problem with this Yamaha's exhaust is that the firing order is 90/270 degrees which puts the pulses at almost exactly the wrong phase to help and infact will REDUCE the beneficial effects. Any 2 into one exhaust on this bike will not produce theoritical max available HP at design point revs. HOWEVER, the std exhaust SYSTEM sucks ( sorry about that) . Actual substantial backpressure , no design harmonics and VERY heavy ( ridiculously. Akrapovic is on record as saying that perfectly good catalysing can be produced with a tiny fraction of the size and weight used by almost EVERY manufacturer of bikes). A good replacement system will reduce weight of the bike ( a good thing) . For any well designed cat included pipe ( eg GPR cyl cats) is as clean as the factory pipe and will be CLEANABLE. Produce a bit more power. Look way better ( not really all that important but it's there. Sound better ( again not all that important but it's there and THIS bike really does sound good even when it isn't too loud). And be easier to work on the bike as they are usually easier to remove and replace. In my opinion THAT is why you change the pipe on this bike. Go forth and modify my son...go forth and modify... Link to comment Share on other sites More sharing options...
Beemer Posted June 2, 2015 Share Posted June 2, 2015 All I know is the loop or the "combustion route reburnifier doo-hickey" which the Akrapovic carbon has, creates more torque in the low and mid range rpm's and you can actually hear the pressure waves resonating from the pipe and the straight Yosh pipe creates more h.p. up top and less torque down low. The Akrapovic carbon gave my bike balls and it sounds bad-ass so I recommend that pipe! Yesterday, some guy was walking with his girl and heard me coming from behind, he about snapped his neck to look around quickly to see what sounded so bad-ass and motioned for me to do a wheelie. I declined because I couldn't do a wheelie and check out his girl at the same time and the look on his face let me know I have a bad-ass bike. Beemer Link to comment Share on other sites More sharing options...
ryan4130 Posted June 3, 2015 Share Posted June 3, 2015 @gregjet in your opinion, what are the top 3 or 5 exhausts for our bike currently out? (Preferably sorted in order). You seem very knowledgeable on the subject and a list would be great if you would write one '15 FZ-09 Cadmium Yellow '15 White Fz-07 - Sold Link to comment Share on other sites More sharing options...
vertigo Posted June 3, 2015 Share Posted June 3, 2015 I am beginning to really like this forum. Actual informed arguements and points. Sorry but I have to add this to this thread and YES I have posted it before. As several pointed out above, it is the pressure waves and their behaviour that is the reason to change to an exhaust that allows these to do their job. I won't go into a long explanation but this bike is at a serious disadvantage when attempting to use additive scavenging ( each cyl pulse helping the other/s extract and reflow). The problem with this Yamaha's exhaust is that the firing order is 90/270 degrees which puts the pulses at almost exactly the wrong phase to help and infact will REDUCE the beneficial effects. Any 2 into one exhaust on this bike will not produce theoritical max available HP at design point revs. HOWEVER, the std exhaust SYSTEM sucks ( sorry about that) . Actual substantial backpressure , no design harmonics and VERY heavy ( ridiculously. Akrapovic is on record as saying that perfectly good catalysing can be produced with a tiny fraction of the size and weight used by almost EVERY manufacturer of bikes). A good replacement system will reduce weight of the bike ( a good thing) . For any well designed cat included pipe ( eg GPR cyl cats) is as clean as the factory pipe and will be CLEANABLE. Produce a bit more power. Look way better ( not really all that important but it's there. Sound better ( again not all that important but it's there and THIS bike really does sound good even when it isn't too loud). And be easier to work on the bike as they are usually easier to remove and replace. In my opinion THAT is why you change the pipe on this bike. I like how it makes my bike go VROOM VROOM. Link to comment Share on other sites More sharing options...
gregjet Posted June 3, 2015 Share Posted June 3, 2015 RYAN, PLEASE NOTE I AM NOT AN EXPERT ANYTHING. SO ANYTHING I EXPRESS WILL BE AN OPINION. An opinion based on what I know , but an opinion nonetheless. First IMHO none of the current exhausts are right . For reasons I have ranted on in this forum repeatedly. However, even I have changed the exhaust . Primarily for WEIGHT advantage ( plus I like snail pipes. call me shallow) I like the GPR GPE, the Akro Carbon and the Yoshy ( yoshie's are usually heavier than they need to be, but can usually be relied on to give good power IF you retune the fuel). Elsewhere in this forum is info saying that both the Akro and the Yoshy produce MORE power with the baffles IN. So you may want to take that into consideration. No one here seems to have bought any of the GPR's which seems strange as they are VERY good exhausts , with a nonrestrictive inline cat and usually cheaper than the others. Their work can be a bit inconsistent , but that is because everything is handmade and they upgrade as they see changes needed. No production lag. If Tyga ever makes a set for this bike consider them. Seriously. It will be cheaper and VERY good. If anyone manufactures a long set of 2 into 2 buy that. Go forth and modify my son...go forth and modify... Link to comment Share on other sites More sharing options...
pattonme Posted June 3, 2015 Share Posted June 3, 2015 I'm not having much luck finding good details on GPR/GPE for the MT07. If this is any indication of the extend of current offerings the headers are long but it doesn't look like they addressed the pulse timing issue.http://www.ebay.com/itm/Yamaha-MT-07-FZ7-GPR-Exhaust-Full-System-With-GPE-CF-Carbon-Look-Silencer-/271687410163 Hmm, then again maybe they have: http://i.ebayimg.com/00/s/OTYwWDEyODA=/z/n6oAAOSwO7pVAp81/$_57.JPG This looks interesting: https://crysellcycleexhausts.com/Mt-07-Gpr.html Link to comment Share on other sites More sharing options...
ryan4130 Posted June 4, 2015 Share Posted June 4, 2015 @gregjet thanks for the reply. I definitely understand your option is not law but have seen your other posts where you discuss exhaust design and I am intrigued. I currently have a yosh system, baffle in. Have not even tried baffle out...it's loud enough as is '15 FZ-09 Cadmium Yellow '15 White Fz-07 - Sold Link to comment Share on other sites More sharing options...
Premium Member norcal616 Posted June 4, 2015 Premium Member Share Posted June 4, 2015 Leovince makes prolly the shortest exhaust out for the fz-07...the headers are tapered for the first 6-7 inches....then it tapers again at the last 6-7 inches before it goes into the "cat" inside the mufffler...Leo Vince did this design to place the heavy muffler/cat combo directly under the bike which I like from a balance perspective... OminiaRacing is sending me the " cat" free of charge since it was somewhat was omitted from my kit...I have a good feeling that runing the exhaust with no baffle and " cat" installed will create the engine behavior I'm looking for compared to currently using no baffle or "cat"... 2015 fz-07- Hordpower Edition...2015 fj-09- 120whp- Graves Exhaust w/Woolich Race Kit- tuned by 2WDW Link to comment Share on other sites More sharing options...
gregjet Posted June 4, 2015 Share Posted June 4, 2015 Norcal, The LeoVince approach is a bit strange. If you narrow the exhaust properly you can shorten the harmonic length but not much. The muffler on most of the aftermarket systems is so light it will have very little effect on centre of mass. Std exhaust ,..yes, most aftermarket ones ( maybe Yoshy excepted, and all the Delkevics I have seen) ...no. The LeoVince approach also would give better torque at a lower rev point ( theoretically) which this bike would like . Pattonme, that third link is a bit sus. Takes me to a wierd picture page, different each time. Out of phase problem will still be there in the GPR GPE. I would have bought that system instead if it had been available when I bought my Akro Carbon. I like GPR stuff. Another MotoGP supplier for those who don't know. And that system comes with a nonrestrictive ( relatively. 100csq") inline cat. BTW the inline cat will help modulate the out of phase problem as it tends to soften the return pulse transient. Go forth and modify my son...go forth and modify... Link to comment Share on other sites More sharing options...
stix Posted August 1, 2015 Share Posted August 1, 2015 I'm having a serious battle of the conscious on whether or not I want the Akra Carbon of the Termignoni carbon...so I figured I'd try to bring this thread back to life considering its been dead for a month. Any updates/changes of opinion on your exhaust choices? How are people liking the Termi and has anyone had the opportunity to hear both the Akra/Termi in person? Link to comment Share on other sites More sharing options...
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