Sooooo many words to simply say...don't fuck with it if it works. I always wondered why all after market exhaust systems sold don't include of 4 or 5 stamped inserts with different orifice openings to insert into the connection between the can and the collector, so a buyer can easily tune the system or bring it back to stock backpressure if he desired and to bring back midrange. And also include a standard plug at the point where all the down pipes come together, similar to the O2 pickup connection, to measure back pressure. This would allow connecting up to a manometer and tune the system for max performance and or to at least duplicate the stock set up.
It would cost but few bucks to include and it would be a marketing plus to all of us techno gecks. I'm not talking about the fancy stack disk system on the exhaust tip sold. hawke On 7/13/02 9:33 AM, "Henry S. Winokur" <[EMAIL PROTECTED]> wrote: > Worth more, RSRBOB, because you have adequately explained why / how the > engine SYSTEM works and why messing with one part probably will not improve > the target without substantially changing the other 2 parts and spending > copious amounts of money. That's certainly one reason why I tend to stick > to "stock" as far as the engine system is concerned. > > Regards, > > Henry S. Winokur > 94 GTS1000, AMA, MRF, > Nationally Certified Riding Instructor > Columbia, MD Ride for Kids Task Force > West Bethesda, MD USA > > >> -----Original Message----- >> From: GTS-1000 Owners List [mailto:[EMAIL PROTECTED]]On Behalf >> Of [EMAIL PROTECTED] >> Sent: Friday, July 12, 2002 10:31 PM >> To: [EMAIL PROTECTED] >> Subject: Re: aftermarket exhausts and other tidbits >> >> >> You guys are getting on the right track with the exhaust systems. The >> statement that small tubes are for bottom end and large tubes are >> for top end >> is correct. One other thing you have to keep in mind here.......... an >> internal combustion engine is effectively an air pump. Its >> efficiency/horsepower is dependant on the volume of air it is capable of >> moving. Here is my point, overly simplified. you have three basic >> componenants to the engine, for the main purpose of processing air. The >> aspiration system, the cylinder head and the exhaust system. >> Increasing the >> flow in any ONE area may or may not yield a gain in perfomance. >> Here is why. >> Put numbers to each componenant. Air volume flowing is measured >> in cubic feet >> per minute. In a perfect world, all componenants would flow >> exactly the same >> volume of CFM. In the real world, such is not the case. There is always a >> bottleneck, so to speak. Example, say your intake flows 150 CFM, your head >> flows 100 CFM and your exhaust flows 200 cfm. Increasing the exhaust or >> intake flow would yield no increase in performance because of the >> bottleneck >> at the rate of flow the head has. In performance engine building, >> they just >> constantly chase the weakest link. Improve head flow above exhaust >> capabilities, build a better exhaust. Got the good exhaust now? >> Intake wont >> keep up, improve the intake. Intake flows more than the head? >> More headwork. >> On and on. My point to all this is that not only are the exhaust tubes >> smaller on the GTS than the FZR, so are the injectors, compared >> to the size >> of the carburetors on the same year FZR 1000. The reason they >> chose smaller >> sizes was indeed to boost low end and midrange ( read that >> usable) horsepower >> for sport touring riding.Smaller tubes increase velocity at lower >> speeds but >> obviously dont handle the volume. To get the same velocity in >> bigger tubes or >> carbs/injectors, obviously, you have to be turning more RPMS to obtain >> similar efficiency. My other opinion on a company that produces a >> perfomance >> product dyno'ing it themselves is buyer beware. Dyno's themselves, esp the >> less expensive brands, say under $15,000, are quite easily >> manipulated to get >> favorable readings where you want them. We are cuaght in a bit of a >> vulnerable position because we are not going to be seeing any >> magazines doing >> independant testing of a NEW HEADER for the 1993/94 GTS 1000 >> Yamaha. Further, >> you can not see what your buddies are using and what works for >> them, or what >> seems to be the hot pipe at the race track. Within reason, bigger >> pipes will >> flow more, and if they are all about the same length, it should >> work and be >> an improvement to some extent for top end horsepower. Whether it >> is worth the >> money/effort to obtain and install becomes very subjective. >> I think all that rattling was my $.03. >> RSRBOB >> >
