Piggy back ecu to smooth out low rpm performance - Page 3 - KTM Duke 390 Forum
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post #21 of 48 Old 09-05-2019, 08:32 PM
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It says says Ready to Race on the TFT on start up for a reason.
Is it because in stock form, it runs so **** lean to pass emissions that it cannot run smoothly?
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post #22 of 48 Old 09-05-2019, 11:35 PM
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I have Rapid Bike Easy and it makes its job. Just last week rode without it whole week and it was terrible on low rpms. Easy instalation, plug and play, without wire cutting.
I recomend
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post #23 of 48 Old 09-06-2019, 12:03 AM
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Thanks Deniss
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post #24 of 48 Old 09-06-2019, 01:32 AM
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Is it because in stock form, it runs so **** lean to pass emissions that it cannot run smoothly?


Ha! Emissions are always a factor. If youíve ever driven a vehicle with a lightened flywheel youíd be very familiar with the same lumpy, jerky, clutch slipping experience people complain about with the 390.
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post #25 of 48 Old 09-06-2019, 08:54 AM
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Originally Posted by Deniss View Post
I have Rapid Bike Easy and it makes its job. Just last week rode without it whole week and it was terrible on low rpms. Easy instalation, plug and play, without wire cutting.
I recomend
And it only costs around £140/$160
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post #26 of 48 Old 09-06-2019, 10:16 AM
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Ha! Emissions are always a factor. If youíve ever driven a vehicle with a lightened flywheel youíd be very familiar with the same lumpy, jerky, clutch slipping experience people complain about with the 390.
Very familiar. In the 1980ís I removed/lightened/8-doweled/rebalanced the flywheel on my 1966 type 1
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post #27 of 48 Old 09-06-2019, 11:51 AM
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Originally Posted by Whyzee View Post
Very familiar. In the 1980ís I removed/lightened/8-doweled/rebalanced the flywheel on my 1966 type 1


Exactly. And Iím guessing you did it for exactly the reason that people choose KTM rather than more mid market oriented offerings. My Duke certainly revs and shuts off massively faster than my sports touring Bandit. Modern software can do a lot with fly by wire systems but you canít eliminate the laws of physics. Iím now going to have to check some part numbers to see if The improved smooth running of the gen 2 bikes is just software or if they played with the balancer shaft. Given Iíve seen commentary that the gen 1 bikes are faster...
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post #28 of 48 Old 09-06-2019, 10:52 PM
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+1 vote for a rapid bike evo. Whole new bike now. Buy the exclusive version. Way better price.

Live in Socal? Message me and lets ride!
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post #29 of 48 Old 09-11-2019, 10:44 PM
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Did you get the last update for ECM?
The bike run much smoother since I got mine!

https://www.ktmduke390forum.com/foru...ce-update.html

2017 KTM 390 Duke
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post #30 of 48 Old 09-12-2019, 11:39 PM
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Hi Mad M. I went against my word and purchased a Rapid Bike Easy instead of the BoosterPlug. I chose the Easy because I am going to leave the engine/air box/exhaust in the stock configuration. I like quiet.

With that said, the RBE arrived yesterday. I installed it today, paying careful attention to route the wiring harness so that it cannot be seen, nor interfere with anything HOT. I placed the control unit under the pillion seat. There is even a small cutout on the left side of the under seat box for the harness to lay/pass into the compartment. Took about 2:15 to install.

Best 200$ spent!!! As others have stated, it transforms the motorbike. It actually makes it ‘civilized’ in the lower revs of the lower gears. Everything that it should be from the factory. Of course it cannot be this way due to the very lean condition of the AFR in order to appease the emission authorities.

There was a hiccup. After starting the second time, the CEL came on. I did the 15:30 idle period to reset the ECU. Even disconnected the battery for a short while. I also turned the fuel potentiometer to +1 (down from +2). Test rode it again and it still runs/rides like a dream. After a few more engine starts/stops/ key cycles, the check engine light went out after startup.

I would recommend the rapid bike easy for a simple device to improve the ride-ability of the 390
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