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| LTGraham | | Set |  |  | | Reg. Date | : | 27/05/2014 | | Posts | : | 34 | | Location | : | Australia |
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| | Posted : 10 Feb 2018 - 21:34 Post title : Valve located in LH exhaust | | | I had the mufflers off my LT yesterday and noticed a cable operated valve in the left hand exhaust, just in front of the muffler. I assume this is a pollution/emission control device? I don't have a manual for LT's yet, and the earlier 1600 manual doesn't seem to show this so I assume it is just an LT thing. Any comments guys?
Graham
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| aussietbird | | Set | |  | | Reg. Date | : | 11/09/2012 | | Posts | : | 263 | | Location | : | WODONGA, VIC, Australia |
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| | Posted : 02 Mar 2018 - 14:59 Post title : Re: Valve located in LH exhaust (Re: LTGraham) | | | Hi Graham.
Sounds very much like the Yamaha exup system. In theory, the reduction in the exhaust helps add back pressure, therefore helps generate lowdown torque. Once the RPM is high enough the ECU triggers a solenoid which pulls the cable and valve open.
Also helps with EPA BS.
| The more I understand the human race, the more I love my bike.
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| Hornet | | Jupiter | |  | | Reg. Date | : | 05/05/2013 | | Posts | : | 1,294 | | Location | : | United States |
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| | Posted : 02 Mar 2018 - 16:27 Post title : Re: Valve located in LH exhaust (Re: aussietbird) | | | Good explanation by aussietbird.
I have a 2014 Commander with this same valve. Here's some additional information, the internals on the stock exhausts are different on the left side slip on and the right side slipon. Very bizarre set up.
Not entirely sure about the LT's as the exhaust slipons are flat on the end so it make it hard to determine. Take a dowel rod or broom handle and run it into both and see it it bottoms out the same on both exhausts
Interestingly Triumphs TOR's slipons ( there's one part number for both the Commander and LT) have identical baffling on both the right side and the left side slipons.
| You'll never be first but you might be next
2014 Commander
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| LTGraham | | Set | | | | Reg. Date | : | 27/05/2014 | | Posts | : | 34 | | Location | : | Australia |
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| | Posted : 03 Mar 2018 - 08:24 Post title : Re: Valve located in LH exhaust (Re: Hornet) | | | Here's a photo of the valve in question. I wonder if there is any performance benefit by adjusting this to the open position?
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| aussietbird | | Set | | | | Reg. Date | : | 11/09/2012 | | Posts | : | 263 | | Location | : | WODONGA, VIC, Australia |
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| | Posted : 03 Mar 2018 - 10:33 Post title : Re: Valve located in LH exhaust (Re: LTGraham) | | | No Graham there would not be.
The reasoning is the LT as far as I'm lead to believe has a locked ECU, therefore the fueling (AFR) can not be altered via programs like TuneECU.
To set the valve in the open position would have two negitive effects.
It would lean out the already lean nature of the birds fueling.
You would also lose bottom end grunt up to the midrange.
Not saying it cannot be done, I'm sure Bazza (Company name) has a unit that plugs into the wiring harness, that tells the ECU that its still there, but the fueling issue will remain. And lets face the truth here, the birdie, is a low reving grunt motor not a top end jap engine.
| The more I understand the human race, the more I love my bike.
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| Ezituper | | Set | |  | | Reg. Date | : | 28/10/2017 | | Posts | : | 46 | | Location | : | HERTFORDSHIRE, United Kingdom |
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| | Posted : 03 Mar 2018 - 11:01 Post title : Re: Valve located in LH exhaust (Re: aussietbird) | | | It might be worth running the bike on stands to check the valves opening and closing (no valve on my nightstorm)
The valve on my multistrada had nothing to do with it running, it was open to 3000rpm, closed briefly, the reopened, all to get the bike through legislation which is tested at 3000rpm.
We all remove them and it actually gets rid of a small flat spot once gone or fixed open.
Yamaha's exup was a very different animal and actually tuned the backpressure to produce more torque at low revs.
Without running a test on a triumph it could be for either purpose.
| Super nightstorm, led headlights, catless short tors.
Wliburs +10 rear, wilburs front. Quickshifter
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