sy
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Posts: 35
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Registered: Mar 1, 2019 13:01:16 GMT -7
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Post by sy on Nov 11, 2019 16:24:54 GMT -7
Hi all
I have a question for all you smart creative types/MT owners out there
Would it be possible to make a manual switch to enable disable the exup valve
Reasons would be beneficial for me to regulate the sound somewhat after a decat
I was kinda thinking of having a custom link pipe made, something between a Leovince with the inline silencer and the Graves with the EVR...I can get my exhaust fabricator to do this at a reasonable cost not much more than the Leovince and certainly cheaper than a titanium Graves EVR
I have kinda played around with my stock cat and shorty muffler and the difference with exup enabled and disabled are quite noticeable in sound levels eg: enabled is very quiet.
Im not pushing for HP just more than my current can and cat offer for sound at present. Without highway drone and it would be nice to have it run quiet at home in the driveway.
My current setup I am happy with at lower speeds but once you get some speed up its hard to hear over wind noise and at times harder to be in the right gear without watching the tacho
Any input will be great not just for me but for the many
EDIT: just one other question regrading a tune
Looking at most graphs the numbers look quite similar from base to decat maybe 15hp gain at the top end. I kinda feel that maybe a tune is not needed for an every day street application..just a thought and I know this has been discussed in detail before but Ive not seen the actual timing and fuel maps just the HP gains. If any one has a map I could compare would be great
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Post by RedAndBlack on Nov 12, 2019 12:58:44 GMT -7
I mean anythings possible (just disconnect the cables from the exup motor under the seat when needed) but I don't see what you're trying to accomplish and why. Maybe I'm misunderstanding? You want to keep the stock exhaust but be able to switch the exup valve on and off?
The exup valve is a valve inside of the stock exhausts that will close, usually at very low RPM, to create backpressure and help with low end torque while managing low end emissions. I think the valve is usually open during high RPM throttle, so there would be no effect on sounds for high RPMs and therefore no real reduction in sound except for low end use. The valve is spring loaded that its default position is OPEN. If you stuck it closed, you would stall. Exup valves are actually a terrible system. On bikes where my exup valve was further up the exhaust and not removed with a slip on, they ALWAYS failed.
On top of that, my understanding of our systems is that the removal of the CAT basically fucks the low end backpressure up, so I think it negates anything that the exup valve accomplishes regarding backpressure.
You could/should get an ECU flash. The Flash should help the bike run smoother and cut down on backfiring. Might even reduce noise a little but I'm not sure about this one. It will reduce/stop the backfiring though which was terrible on this bike when i did the decat.
If noise is the issue, you really should keep the pre-exhaust chamber and just get a slip on that connects to it.
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sy
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Posts: 35
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Registered: Mar 1, 2019 13:01:16 GMT -7
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Post by sy on Nov 12, 2019 14:20:00 GMT -7
Thanks for some input I do at current have a short slipon (just a cheapy I brought experiment with) with the exup wired open. The volume and tone is pretty spot on except at speed when wind noise cuts out the exhaust noise....on occasion I find the I am still in fifth gear or get caught out in a gear too high because I cannot hear the engine. I have played with the Exup with the slipon and volume difference is noticeable between enabled and disabled I want to replace the OEM cat with a decat (probably the Leovince) and my thoughts are that a decat might be too loud and feel that maybe adding back the exup will add back some dampening in sound (have a squize at the link) mt10ukoc-forum.boards.net/thread/83/decat-oem-r1-headers-swap?page=2From adding back the exup it could possibly cancel out the volume increase from the decat which would be good at home on the drive or around town but again too quite at speed..(I dont know just a theory) Enabling the exup may cancel out any noise gain From what I understand of the exup (read from Yamaha website) is that it opens and closes from throttle response and gear selection. The back pressure it creates is supposed to aid in fuel consumption and noise reduction Looking on you tube (from a post showing the valve working) the valve seems to be opening only on hard throttle responses and closes somewhat as the pressure reduces I guess what Im trying to achieve is a reasonably quiet bike when needed and more noise when needed and by way of an electrical switch or a mechanical one at the valve All just theory atm and just looking at possible outcomes |
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Deleted
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Registered: Apr 25, 2024 7:22:45 GMT -7
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Post by Deleted on Nov 13, 2019 11:08:36 GMT -7
If you can leave the valve, I'd leave it. It allows the engine to be stronger at lower rpm, and at higher rpm it reportedly doesn't have any restriction. The only parameter I know about the valve because I had a CEL when new, is it fully opens at 7K rpm, regardless of throttle opening. And I can also tell you it's not a good idea to remove the cables, since you'd need to loosen them, and they need a precise amount of play when re-installing them, and it takes time to adjust them properly (specs on service manual). That's why I had a CEL when new: one of the cables was a bit too tight. Another option would be to buy a can with the provision of a baffle, but it'd be restricting airflow more than the valve IMO; that's why I suggested to keep the valve. It's there for a reason  . Good luck. |
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Post by hooli on Nov 14, 2019 11:07:55 GMT -7
The exup valve is regulated by the bike's ecu. There is no way that you could take into account all of the input data it sees from the engine to determine valve position for optimum performance. If you want a decat that deletes the converter, retains low speed torque & keeps the noise level down, yet flows nearly as well as a straight-through aftermarket 3/4 system, Graves Performance has already done the homework for you:  |
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sy
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Posts: 35
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Registered: Mar 1, 2019 13:01:16 GMT -7
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Post by sy on Nov 14, 2019 13:36:44 GMT -7
Thanks eptlxjc and hooli
Im certain now that Im going to decat and keep the valve but Ill forego the resonator
Id love to have enough cash to throw at the graves evr but here in NZ it will cost me 2k just for the link pipe, I understand that its titanium but geese Im not even going going to justify that cost
My fabricator will do one in SS keeping the 02 and valve for under $300 which will match my SS oem header
The draw back will be that I cant FTecu flash the graves map as its only supplied with purchase of their system
Im now looking for some info on FTecu from members and in time will talk more with the tuner
If I purchase the bench flashing kit do I have an option to choose from a list of maps somewhere or am I only given a generic map. Are the maps fueling locked or can I adjust them
If I do an email my ECU flash, does the the Tuner that flashes the ecu have lots of maps available to choose from or is it just generic
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sy
New Member
Posts: 35
Likes: 9
Registered: Mar 1, 2019 13:01:16 GMT -7
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Post by sy on Nov 18, 2019 18:31:59 GMT -7
Just found this on youtube
Hard to tell from vid but seems to be little gain whereas when I open close it at home shows a deffinate change in volume
I will also add here that having the valve enabled also helps with mitigate popping not that I am getting alot with a can only change
My fabricator is building my new custom link pipe today 02 sensors in valve operational and an inline silencer. Hope I get good gains
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chesterburnet
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Registered: Nov 29, 2019 15:12:11 GMT -7
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Post by chesterburnet on Jan 5, 2020 10:54:31 GMT -7
This thread is a little bit old now but having just bought a new 2019 MT10 I immediately started researching and bought an aftermarket exhaust. This excert below is from Vcycleneut's website regarding flashing the ECU and the exup valve. Having had great success on my FJ09 with him, I sent my ECU to him and expect it back tomorrow. Exhaust will arrive Wednesday and the entire exup assembly is removed ( which also creates some much needed under seat space). Of course this is only for competition purposes. 
"Disabling the exup valve. The exup valve is a butterfly valve that is in the exhaust. Yamaha markets them as a midrange power enhancer. This is no longer true. When the exup valve was first used on the FZR1000 and on the early R1's it was true. Since 2004 with the R1, since its introduction on the R6 in 2006, and since the 2006 FZ1 it actually hurts low and buttom end power. It is strictly a way to get the bikes through noise emmisions. With the exup valve disabled you can remove it from the bike and it will not show an error code, nothing else to buy. You can also leave it on the bike as it will stay in the open position except on start up when it will still go through its normal open/close cycle."
I also removed the O2 sensors and wires which is easy, clean and you save them in the event you'd want to reinstall at some point. I got the plugs to seal the connector ends from this guy and it went well. www.cycleterminal.com/hm-sealed-series-090.html The part number is Female HM090-4 and you need 2. Fill the 4 round ends with silicone and it's all sealed off and sanitary looking.
I've seen people recommend snipping wires. Bad idea. It's not necessary and it's so easy to do it cleanly and be able to put the bike back to stock in 15 - 20 minutes if you ever find the need.
f you've done a flash then all you need to do to stop the decel popping is to fill up the AIS intake which is in the airbox with a wadd of electrical tape. Works like a charm. See attached picture.  |
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Post by hooli on Jan 6, 2020 10:17:44 GMT -7
2WDW developed a flash that works with the stock exhaust and the exup valve wired open. I've been running that for nearly a year and it works great. The exhaust note is notably louder and slightly deeper that stock but not as obnoxious as some of the shorty aftermarket 3/4 de-cat systems out there. For the price and ability to return the exup system back to stock (motor and cables removed), it's quite a deal.
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. Good luck.
