mt
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Posts: 4
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Registered: Apr 3, 2019 14:18:00 GMT -7
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Post by mt on May 28, 2020 19:42:37 GMT -7
2WDW Stock tune, wondering if anyone might have any any pictures, preferences or elaboration on how to wire the exup for always open for this tune? I searched and found great write ups for the O2 delete and ECU removal on here, but I'm a bit conflicted by posts on the exup portion.
I'd like to leave the cables in place if possible, but I was concerned this may cause binding and stress on the system if it was wired to stay open - and yet the system might still try to yank it closed at low RPM and startup cycle, possibly causing damage to cables, servo? Looking for the least invasive and reliable way to match this tune in summary. Your expertise is much appreciated.
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Post by RedAndBlack on May 28, 2020 21:54:57 GMT -7
So, at least to my knowledge, the EXUP valve default state is OPEN. The motor closes it, not opens it. Now, I'm not sure if the 2WDW flash disables the system or still allows the ECU to send commands to the motor to close the valve. You're probably going to have to contact them and ask unless somebody else here knows the answer. If they disabled the EXUP, you're fine to leave the wires in place as the valve will remain open.
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Deleted
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Registered: Apr 19, 2024 3:53:47 GMT -7
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Post by Deleted on Jun 3, 2020 21:19:19 GMT -7
The EXUP valve has a spring that pushes it open by default. Only the servo motor can close it. So if you don't want that to happen, you need to either remove the cables, disconnect the motor, or both. Disconnecting the motor would result in a CEL, so you'd need a module to fool the ECU the motor is there. Removing the cables would be the cheapest option (free  ). Good luck. |
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jdm74
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Registered: Jul 19, 2020 12:02:55 GMT -7
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Post by jdm74 on Aug 4, 2020 15:52:19 GMT -7
My ECU is on its way to 2WDW and I asked him the same question, i.e., can you just disconnect the cables and let it be since the motor only closes the valve? Here is his response:
"We disable the fault codes for the EXUP system, but it does need to be safety-wired open mechanically to make sure that it stays open at all times. The exhaust pulse cavitation can overcome the EXUP valve's spring and force it closed inappropriately if this is not done. Simply remove the servo, cables, and safety work open the valve!"
Edit: So I just took out my cables in preparation for safety wiring the valve open. The valve is 100% spring close, not open. I removed the spring from the top of the valve where the cables attach and now it freely moves open or closed so I have it sitting wide open now (it have a positive stop) ready to safety wire once my pliers and wire get here.
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jdm74
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Posts: 10
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Registered: Jul 19, 2020 12:02:55 GMT -7
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Post by jdm74 on Aug 7, 2020 14:08:22 GMT -7
Safety wire and pliers came in today, ECU gets here tomorrow so I thought I better take care of this. Here is how I did mine:  Untitled by JASON MCKIMMEY, on Flickr I driller a hole in the mount for the cable sleeves and ran the wire through that and this is how I buttoned it up. This is my first time safety wiring anything so pointers are appreciated.  Untitled by JASON MCKIMMEY, on Flickr  Untitled by JASON MCKIMMEY, on Flickr The butterfly valve is hard up against its stop and has zero play. |
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Post by RedAndBlack on Aug 8, 2020 10:59:58 GMT -7
Nice write up!
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wardy236050
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Registered: Oct 24, 2021 21:10:11 GMT -7
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Post by wardy236050 on Oct 24, 2021 21:30:59 GMT -7
Well done, stainless steel lockwire always comes in handy and is in abundance in the aviation maintenance world. I always carry a couple of meters in my tool roll.
I just picked up a 2nd hand 2017 MT10SP, it's in pretty good condition, but after going over it i found that the previous owner had removed the servo, the cable and the cam from the exup valve. I pulled the muffler to check the butterfly and it was still there but nothing stopping it from turning, so while the muffler was off i drilled the screws(as they are spot welded) and removed the butterfly leaving the spindle intact. Makes me wonder what the guy was thinking, leaving the butterfly there with nothing securing it, i bet he couldnt understand the power loss, with the exhaust pressure causing the valve to fluctuate or at worst close completely??? When i get time i'll pull the spindle out and close the holes off. Also had the dreaded coolant leak from the water pump outlet pipe o'ring, so its gone back to the shop so they can fix it at their cost.
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mclovin
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Registered: Aug 20, 2020 12:48:57 GMT -7
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Post by mclovin on Oct 25, 2021 9:00:10 GMT -7
I replaced my midpipe and silencer along with a flash by Vcyclenut. Since the exup valve was disabled, I removed the servo assembly under the seat and all of the wires that go to it. I also removed all of the wires for the O2 sensors. The wires are easily removed and don't require any cutting and can be reinstalled easily. Why have the extra weight and clutter. It also looks a lot cleaner. I have a big box of parts that are almost brand new that I removed from my bike. If I sell it, I'm going to just give them to the next owner. If they want to put them back on, they can.
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2022mt10
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Registered: Aug 5, 2022 14:16:23 GMT -7
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Post by 2022mt10 on Sept 13, 2022 8:01:09 GMT -7
On the 2022 the spring holds the valve closed. I fenangled it around the tabs to hold it open. Before  After 
I just realized by staring that that picture that the spring needs another turn so the legs fit the correct way. And it will give it more tension. |
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slipwrist
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Registered: Aug 23, 2022 15:03:56 GMT -7
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Post by slipwrist on Sept 16, 2022 15:54:34 GMT -7
2WDW Stock tune, wondering if anyone might have any any pictures, preferences or elaboration on how to wire the exup for always open for this tune? I searched and found great write ups for the O2 delete and ECU removal on here, but I'm a bit conflicted by posts on the exup portion. I'd like to leave the cables in place if possible, but I was concerned this may cause binding and stress on the system if it was wired to stay open - and yet the system might still try to yank it closed at low RPM and startup cycle, possibly causing damage to cables, servo? Looking for the least invasive and reliable way to match this tune in summary. Your expertise is much appreciated. Personally, I would get back in touch with 2WDW. Unfortunately Nate is destroying the good name that Nells, the owner, has built. Nate kinda runs the show now and is a total douche tool! |
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Post by hooli on Sept 26, 2022 8:49:56 GMT -7
Personally, I would get back in touch with 2WDW. Unfortunately Nate is destroying the good name that Nells, the owner, has built. Nate kinda runs the show now and is a total douche tool! Dude...  I've been reading your posts and I don't know where the internet hurt you, but between your coming here talking s**t about 2WDW and pushing for Vcyclenut, I strongly suspect that you're nothing but a shill for the latter. |
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). Good luck.
