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Re: Exhaust Servo

Posted: Wed May 30, 2018 12:31 am
by vet57air
Disconnecting the battery for a bit should remove the faults as long as they are no longer present.

Re: Exhaust Servo

Posted: Wed May 30, 2018 9:26 am
by Billy111
Thanks for the reply vet57air. Excuse my ignorance with the tech stuff. Does the battery disconnect also lift the bike out of limp mode?

Re: Exhaust Servo

Posted: Wed May 30, 2018 10:20 am
by DaveNZ
Billy111 wrote: ↑
Tue May 29, 2018 9:31 pm
Hi guys. New here but have been stalking as a guest for a while! I am a couple of months in with my first KTM SDGT 2017. Great bike but I have caused myself a few problems. I fitted a Remus link pipe and servo stopper shortly after I got the bike and all was good. After a few weeks I started getting intermittent MTC failures on ignition on. The fix was ignition off and back on and no MTC failure and the bike was riding fine. I then got an engine light and diagnostics showed
'exhaust valve cable adjustment' (fault)
'exhaust pressure valve' (fault)
Dealer told me no mapping available to bypass these faults so bike needs to be returned to standard to clear errors.
I have returned bike to standard but screwed up and turned on ignition before refitting the servo motor plug and now have permanent MTC failure and bike is in limp mode.
Going to dealer on Monday to clear fault codes.
I have a Healtech ESE coming and my question is does the ESE get rid of all fault lights that removal of the CAT and servo may throw up?
Are they now reliable with the SAS and O2 sensors still in place or must this also be removed?
Has anyone had experience with the Hilltopmotorcycles mapping and what mods are worth doing to get the most out of it?

Sorry for the lengthy post and thanks in advance.
I have the O2 sensor removal plugs from Rotweiler, if i was you id go down this route, the dongles that plug in help raise the fuel air ratio so it won't run lean, the new ESE they sent me came with O2 sensor removal plugs but i stuck with the Roweiler ones i had already fitted. What i have found with the GT, when a fault occurs, and no remedy is sort the fault continues, when the fault has been sorted, the GT sorts its self while riding, or after been ridden turned off then later restarted.

Re: Exhaust Servo

Posted: Wed May 30, 2018 9:57 pm
by Billy111
Thanks for the advice lads. Really appreciate it. My dongle from Healtech arrived this afternoon and 30 mins later I was ready to go out. Ignition on and woohoo, no MTC failure flashing and no limp mode. Still had engine light on but went out for a run with 3 short stops with ignition off at stops and engine light is gone.
These forums are brilliant for working through problems. πŸ‘

Re: Exhaust Servo

Posted: Mon Jun 11, 2018 12:40 pm
by ELEVENS
Wondering about the purpose of the exhaust valve. Noise (sound) is one thing I'm willing to give up. However, certain performance exhausts (i.e., Graves) have gone full circle and now manufacture full replacement exhausts for racing with an exhaust valve in-place. Reportedly, it adds a significant amount of low-end power.

I'd love to ditch of all that ugly, heavy hardware, but I'm a "function over form" guy and won't modify without actually improving performance. On this bike, useable torque trumps ultimate power (of the horse-power variety). Is there any dyno evidence that removing or disabling the valve on the KTM GT doesn't negatively impact the torque curve?

Re: Exhaust Servo

Posted: Tue Jun 12, 2018 5:46 pm
by Tmation
Elevens,
There is a video on youtube that shows the exhaust valve in operation.
When you start the bike it is in the open position (full flow), at around 5,000 rpm it closes (where the noise test for Euro 4 is done) and then after that the valve opes again for full flow.
It would seem the valve is there to just pass the noise test.

Re: Exhaust Servo

Posted: Sun Jun 17, 2018 8:42 am
by casull
Tmation wrote: ↑
Tue Jun 12, 2018 5:46 pm
Elevens,
There is a video on youtube that shows the exhaust valve in operation.
When you start the bike it is in the open position (full flow), at around 5,000 rpm it closes (where the noise test for Euro 4 is done) and then after that the valve opes again for full flow.
It would seem the valve is there to just pass the noise test.
I have been searching for that video but can’t find it, du you have a link?

Re: Exhaust Servo

Posted: Sun Jun 17, 2018 9:36 am
by jhalfhide
Same as the Ducati exhaust valves. Only there for noise restriction for the testing. Does nothing for tuning power or exhaust flows.


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