Subject	sounds like Yamaha's Exup system is what you are wanting
Posted by	SkiFly01 on July 02, 2008 at 12:37 PM
	This message has been viewed 201 times.
In Reply To	Interesting > posted by Ash's Z on July 02, 2008 at 09:19 AM
Message	On my 04 R1 it has the EXUP (EXhaust Ultimate Power valve) Wiki EXUP EXUP (EXhaust Ultimate Power valve) is a device fitted to selected Yamaha motorcycles (FZR,YZF,XV1900,R series) that constantly adjusts the internal diameter of the exhaust system to suit engine revs. This ensures good low to mid-range performance for a linear power output all the way to the rev limiter. This is achieved by using an internal valve (similar to a butterfly valve) inside the exhaust at the point where the four pipes from the cylinders meet. Closing of the valve then creates a venturi effect inside the exhaust system, causing an increase in pressure on the engine side of the exhaust system. This increase in pressure results in greater exhaust velocity. A full description of the process can be found on the exhaust manifold page. A servo motor controlled by the ECU opens and shuts the valve. The EXUP valve operation goes from being almost fully closed at idle speed, through to being fully open at 9000 to 11000 RPM (2500 RPM for XV1900). Kai Now a member of the Dark Side TitleTown FL body kit is considered -2 on the stage chart - Guapo 10:36:58 12/14/05 AshsZ in Florida: I'm gonna fire my sh** up today 1/14/06 90% of the time ..plano soccer mom girls are hot the other 15% they are crackwhores...with the overlap. -genic 06/29/06 Drag cars have brakes? Real men have parachutes. - Bernie (NoVA) 01/13/08
Follow Ups	Interesting > - Ash's Z 09:19:15 07/02/08 Hm...that is Interesting. - WoodmanZ 09:26:46 07/02/08 For noise control in city driving. (n/m) - Bernie (NoVA) 09:27:15 07/02/08 www.atpturbo.com - Kong ZTT GT28RS MD 09:29:22 07/02/08 Interesting > - ENVYMYZ 09:47:02 07/02/08 In 3, 2, 1 ... (n/m) - phillyz 09:52:41 07/02/08 2nd. - Drk93TT 10:22:51 07/02/08 Yeah Ash. - eriksu9 10:39:16 07/02/08 I called him twice a day for a month he never answered. - AntiHero 10:46:07 07/02/08 Im not saying dont do all that fun stuff. - Drk93TT 11:18:44 07/02/08 Drive off a pier (n/m) - BigTDogg (MA) 11:45:38 07/02/08 Drive off a pier? - eriksu9 12:20:10 07/02/08 No one forces people to go into business, if I recall. (n/m) - AbsolutZ (OH) 11:55:16 07/02/08 Noone forces people to buy from any - eriksu9 12:56:08 07/02/08 Than maybe he should stop advertising "24 hour" turn around? - ZXRider(SoCal) 13:01:58 07/02/08 Hold up a sec bro, and I'll be sensitive to you here... >> - Ash's Z 13:07:14 07/02/08 a golden rule of sales/customer service - HicasZ 17:47:12 07/02/08 My experience was fine... - bliZard 13:19:00 07/03/08 You are obviously "not in the know." - eriksu9 13:48:10 07/02/08 You are redefining irony. - Kenny 14:11:22 07/02/08 I am not redefining anything. - eriksu9 15:17:32 07/02/08 Your such a turd... go play child. (n/m) - 550HPTT 15:51:42 07/02/08 Give the guy a break; he has brought more to the Z community - EZEZ(NA>>TT) 16:57:48 07/02/08 Does not matter - BigTDogg (MA) 13:03:13 07/02/08 you seem to conveniently forget that there are always two - LJZTT 09:08:53 07/03/08 I don't get it (n/m) - BigTDogg (MA) 12:48:48 07/03/08 I see what you're saying... - AbsolutZ (OH) 14:32:38 07/02/08 Hold on. I am in no way saying this list I posted - eriksu9 15:34:57 07/02/08 Right. - AbsolutZ (OH) 17:16:20 07/02/08 I couldnt imagine feeling the need, much less actually - LJZTT 09:14:06 07/03/08 Neither can other vendors, who don't have that issue. - Kenny 09:28:08 07/03/08 I've seen morons make unsubstantiated posts complaining - LJZTT 10:11:01 07/03/08 I think there's a loophole to the 24 hour turnaround :-) - Dave N 10:24:58 07/03/08 I guess, butif I am getting you right, you are saying the - LJZTT 12:58:03 07/03/08 You're reading too much into my reply. - Dave N 13:09:25 07/03/08 No offense Dave, but it seems pretty plain to be a thinly - LJZTT 17:44:53 07/03/08 Why did you change your response? Your previous one was - Dave N 20:13:55 07/03/08 You do realize... - Kenny 11:31:57 07/03/08 calling one out on acting poor doesn't = acting poor - LJZTT 12:42:10 07/03/08 Par for the course =). - Kenny 13:39:32 07/03/08 You placed me on the other side of your "fence", not me - LJZTT 17:40:10 07/03/08 I didn't place you anywhere, I simply observed your location - Kenny 22:53:04 07/03/08 Big 2nd on the bandwagon/lynch mob comment. (n/m) - racer2fst 11:57:50 07/03/08 Sure, but again nowhere near the same number - SeedyROM 12:31:28 07/03/08 to hell with the stubborn, there's always people who have to - LJZTT 12:51:18 07/03/08 I respect your stance, but... - AbsolutZ (OH) 02:36:43 07/04/08 Which is enough to influence people like me who think - LJZTT 16:29:04 07/04/08 Good point. (n/m) - ForceFedTT 21:28:06 07/02/08 I don't mean to be a jerk or mouth off but all this - nonstopna 20:02:49 07/02/08 Re: Interesting > - Ash's Z 10:32:22 07/02/08 I have no issue with you. You've answered any and - ENVYMYZ 10:36:42 07/02/08 Re: I have no issue with you. You've answered any and - Ash's Z 10:50:53 07/02/08 I didn't mention anything about ECU's other than - ENVYMYZ 10:55:21 07/02/08 Well to be brutally honest - Drk93TT 11:08:08 07/02/08 Fair enough.. - Ash's Z 11:32:53 07/02/08 ... - Drk93TT 11:05:58 07/02/08 Nothing new, my 04 M45 has something similar but is further - RAGTPZ 10:34:25 07/02/08 Welcome to the early 90's Mitsu 3000 VR4 - Dave N 11:06:42 07/02/08 That's right along the lines of my OP. - Ash's Z 11:10:22 07/02/08 If Nissan thought there was merit to this idea, I'm sure - Dave N 11:16:26 07/02/08 Perhaps. But vehicles are manufactured within set financial - Ash's Z 11:37:16 07/02/08 That's why I referenced the GT-R. While it is still subject - Dave N 11:57:42 07/02/08 Makes sense.. Backpressure on a turbo car is hard to - Ash's Z 12:09:32 07/02/08 Don't know if it is for "lowered performance" - NytWolf 11:20:59 07/02/08 Backpressure = torque is a terrible oversimplification. - Kenny 13:42:41 07/02/08 performance had nothing to do with it - LJZTT 09:36:02 07/03/08 Speaking of exhaust back pressure. I have had this - AZHeat 12:13:40 07/02/08 Interesting concept. The only question is whether or not - Ash's Z 12:26:26 07/02/08 as long it is electrical and doesnt demand more power than - Atl300zxTT 12:38:01 07/02/08 sounds like Yamaha's Exup system is what you are wanting - SkiFly01 12:37:24 07/02/08 Thoughts of a "telescoping" exhaust system ring to mind.... - Ash's Z 13:27:26 07/02/08 couldnt a series of cut outs do this? (n/m) - Atl300zxTT 13:41:33 07/02/08 Or an exhaust designed like a trumpet (n/m) - BlackholeZ 14:49:39 07/02/08 also common on ferrari's - i_drive 13:38:47 07/02/08 Z06 Corvettes have that set-up... - Z1rider 14:00:31 07/02/08 correction ... all new Vettes' have that now (n/m) - Luke@tirerack 16:31:59 07/02/08 Ash...give me a call... - mikem@ztune.ca 16:20:49 07/02/08 Join the club, he doesnt like Canadians I think. (n/m) - MeatMan 21:11:16 07/02/08 It is for low end torque - jcieslik 16:45:02 07/02/08 I wouldn't call your link conclusive proof - aliaZ 19:06:46 07/02/08
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