17+ Stage 1 BMW K1600 B/GA/GT/GTL Mail-in

(2 customer reviews)



Huge power and ridability improvements — turn the bike into the one you dreamed it would be!

Out of stock

Product Description



The BT Moto Stage 1 Flash is the single best modification you can do to the motorcycle! After months of testing we have had successfully calibrated our in-house test bike, a 2018 K1600B Grand America. This calibration will work for all B/GA/GT/GTL bikes as the ECU’s are the same with minor differences between them.


The biggest complaints from owners revolved around the pitiful throttle response and of course, the terribly restrictive top speed limiter (GA especially which we found to be around 105MPH). First we baselined the motorcycle in 100% stock ECU form, the motorcycle we used for testing has around 8,000 miles and was well broken in. In stock configuration we found all the talk of poor throttle was spot on, we also found the bike hit the speed limiter in the top of 3rd gear, with 3 more gears to go — frustrating to say the least, especially on a bike of this nature. The power flattened out and the motor was very rich and under-timed.

With or without custom mapping, we all know the BMW K1600 is a wonderful bike that’s amazing for touring! We also know it isn’t perfect. Issues that we’ve verified ourselves and what customers have reported include the following:

  • Bad throttle response
  • Top speed limiter at 105 MPH (GA)
  • Under-timed engine that may feel lazy when power is needed
  • Mapping only good for one kind of fuel


After months of testing we have had successfully calibrated our in-house test bike, a 2018 K1600B Grand America. This calibration will work for all B/GA/GT/GTL bikes as the ECU’s are the same with minor difference between them.  We have also tested our mapping on the road while logging all parameters of the bike to ensure reliability and consistency.  So what did we change?

  • Improved throttle response! Throttle tables maximized to provide a snappier and more responsive throttle (see below for throttle table details).
  • Top speed limiter removed. No more 105 MPH limit. We tested our own K1600 all the way to 170 MPH on our in-house dyno (NOT EVER RECOMMENDED ON THE ROAD).
  • HP gains of +18HP with a climbing HP curve from 5000RPM to redline – we did this by modifying the throttle which is stuck at a 75% max opening in factory configuration; with light changes to ignition timing and torque, along with other tables that have proven to work great in the BMW tuning world.
  • Ignition advanced with safety in mind – there are multiple ignition maps for the K1600. We have altered these maps to give you maximum power. We also have safety built in. If your bike detects a lower octane fuel or fuel that may be bad out of the pump, our mapping will pull power out of the bike until it gets quality fuel.
  • With our handheld tuner we can configure and maximize mapping for any kind of fuel with the ability to go back to your stock mapping if you need to go to the dealer for servicing or warranty issues.

**All riding modes still work as designed and all will have the throttle improvements that we have implemented. Dynamic mode will still be what you want to use for maximum performance and power.**


As you can see in the software screenshots below, the K1600 ECU is only commanding a fraction of what the engine is capable of outputting.  Our flash completely eliminates those restrictions without compromising rideability or the reliability of your motorcycle.

Check out this 3D throttle map overlay for stock vs flashed.  The yellow/orange sheet on top represents a flashed motorcycle throttle request in the software.  The blue and green under that represent the stock throttle request.


K1600 Dyno Stage 1

**All in-house testing performed with 93 octane pump gas. Usage of a lower octane will yield smaller power gains.**

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Customer Testimonials


Additional information

Weight10 lbs
Dimensions15 × 15 × 15 in

2 reviews for 17+ Stage 1 BMW K1600 B/GA/GT/GTL Mail-in

  1. Willie Cooper

    I’ll get right to the point: The Bren ECU Flash fixes the 2018 K1600 GT. The bike now feels like it has a legitimate, 160 crank-horse power motor. The throttle still feels like a ride by wire system, but it is now much more confidence inspiring.

    The Bren people are professional, knowledgeable, and responsive. My ECU arrived late on a Wednesday and was stamped out of their offices the next day. I have found nothing but glowing references on them and my experience has been exceptional. I also think the price is a steal, especially if you’re suffering with the 2018+ K-bike’s throttle maladies.

    I removed the ECU using the video on Bren’s website. The video bike is a K16 B, but it was identical to my 18’ GT. No surprises are good. I installed the ECU using Bren’s instructions and the bike started right up and it idled perfectly around 1K rpm. I waited for about 15-20 minutes without touching the throttle as the bike warmed up. Then I took the bike for an initial test and was cautiously optimistic.

    As was stated, my main goal was to fix the bike’s throttle, and that mission can certainly be stamped “ACCOMPLISHED”. The throttle is progressive and without the annoying flat spots of the stock control. Pulling off is easy as pie, like it should be – no more embarrassing stalls. In fact, the bike is significantly more manageable at parking lot speeds. When the throttle is closed, there feels like less engine braking than before but there is still a useful amount to coast up to lights or to decelerate into a turn. I used to get cramps in my throttle hand after just an hour of riding. Today I rode for 3 ½ hours straight with no discomfort at all.
    Dynamic mode is positively fun, transforming the big K into a frisky puppy with a nasty growl. Road mode is now properly usable. Rain mode is also now functional – I was always worried more about getting caught out with no power than breaking the rear wheel lose.

    The quick-shifter is as smooth as stock but seems a bit clunkier than before. This however is an auditory issue, as the bike does not lurch or object when shifted. In other minor issues, there is a bit of a pop when the throttle is shut off abruptly.

    You really start feeling the additional punch at around 4.5 – 5K. You can feel the bike pushing you back into the seat and WOT is impressively more frenetic. Part of the new-found thrill is a new, much louder, snarky intake growl. In fact, the ECU flash has given the bike a decidedly more aggressive, sporty attitude. The power is still smooth and turbine-like, there is just a little more of it.

    What Bren has done to clean up the K16 is impressive. Even more impressive is the reasonable cost and quick service. Bren’s Stage 1 flash is a conservative and well targeted flash that delivers the promise of the 2018 K16.

  2. Bob jarrell

    My ride review on my 2018 BMW Grand America, all 2017 and newer k1600 BMW bikes from the factory come with a very lazy throttle response and the GA has a top speed limiter set at 101 mph. So during the holidays I sent my ECU to Cris at Bren Tuning for the stage 1 re-flash for the above noted issues. Shipping to and from Bren Tuning including the re-flash was four days excellent service. Yesterday was a perfect day to ride the West Virginia mountains a 250 mile spirited ride, in either rode or dynamic mode the throttle response is spot on no lag anymore. Shifting is buttery smooth with quick shifter or clutch no clunking as a previous review I read. Didn’t really get to stretch out the top end MPH since we were riding through the mountains but 101 mph limiter is gone 👍 I was curious about fuel mileage after the flash mine is the same 42 mpg spirited riding and 50 mpg riding the speed limit. The bike is tuned perfectly no flat spots just a pleasure to ride. So if anyone is on the fence about this re-flash it is legit. A professional company with great service and knowledge with the performance to back it up. Thank you for your help Bob Jarrell

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  • “ Bike is running awesome and no out of the ordinary popping under load during downshifts at high rpm. My hats off to your team for making me feel like I have a personal tuner at my disposal. Really appreciate the quick turnaround to get me straight. I can definitely feel the extra power! ”

    Andy Young - Maryland Aug 28, 2018
  • “ This product is amazing.  I feel like I have a better version of my bike.  Like it should have come this way.  The throttle smoothness and even power band make it a joy to ride.  I no longer feel as if I'm riding a wild bronco lol. Thank you again, I didn't think that a L-twin could behave this well.  Also, your customer service is the best.  I could always reach you by email or phone.  I will tell everyone I know about this fantastic addition.  Keep up the great work, guys! ”

    Dan Martinez May 01, 2017
  • “ I have a 2015 S1000RR and was extremely skeptical when I heard about BT Moto and the power they got out of an ECU flash.  After speaking with the team at BrenTuning, all my hesitations were put to rest and I haven't stop winning first place trophies since! BELIEVE THE HYPE! ”

    Troy Gleason - California Jul 10, 2016
  • “ Bren and his team did an awesome job on my bmw s1000rr. Went from 179rwhp an 83 rwtq to 206 rwhp and 93rwtq. Customer service was great and I highly recommend them for any of y'all that want to make that power!! ”

    Paul Jackson - Texas Jul 10, 2016
  • “ Purchased the tune for my 2015 BMW S1000RR. Was skeptical at first and initially had a bunch of questions. Chris was very patient with me and answered them all. Had some problems after receiving my ecu back and Chris was very helpful in getting all my issues worked out. Bike runs fantastic. Definitely worth it. Thank you again guys for dealing with my questions and taking care of everything before and after the purchase. Fantastic customer service. ”

    Cody Hunsucker - Tennessee Jul 10, 2016
  • “ After doing some research it was obvious that BT Moto was the best option for tuning of my S1000RR. I wont go into details but after multiple overnighting of parts to me at no additional charge, I'm really impressed and satisfied with the end result and I haven't even tried out my race fuel tune yet! To top if off I received a random care package of goodies from Chris today. The customer service at BT Moto is probably the best I've received from any business I've dealt with. Their email response times are unreal as well, lol. Literally sometimes instantly, kinda weird. lol. I would recommend any and everyone to BT Moto for your S1000RR tuning solution. If anyone has any questions or are hesitant before purchasing, feel free to shoot me a message and I'll help / assist / give you a more detailed opinion on my experience as well. ”

    Trey Hull - Texas Jul 10, 2016
  • “ I have the Bren Tuning ECU flash on my 2015 BMW S1000RR and it is unbelievable how fast this bike is. This tune is the best thing I got for my bikes. I have also did the Bren Tune for my 2014 BMW S1000r for which it just made this bike really nice. Bren Tuning is the best. ”

    Darnell Edwards - Maryland Jul 10, 2016
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