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13-16 BMW K1600 BMSX (Mail-In ECU Tuning)

Rated 5.00 out of 5 based on 1 customer rating
(1 customer review)


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


Product Description



The BrenTuning Stage 1 Flash K1600B/GA/GT/GTL is the single best modification you can do to the motorcycle!


After weeks 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. 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). We have collected all the information and each software revisions per US and EU.

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.

We first started by locating the ECU, this is on the right hand side of the bike if you are sitting on it right on the front / nose portion (visible in the pictures, the silver square is the ECU). We will have a how-to video on this in the near future to detail how to access this but it is straight forward and pretty simple. After removing the ECU, we read it out and defined the most important tables one by one. The ECUs are identical to those found in the S1000RR as is the map structure which we are most familiar with. What this means is that the architecture of the ECU and how to modify it was natural for us. What works on S1000’s in many cases directly translates directly to this ECU and motorcycle.

Our first goal was to locate the speed limiter tables, after doing so we tested and found the limiter to be removed completely with speeds up to 170+ tested on the dyno (not recommended for street at all). After figuring out the top speed limiter, we broke into the horsepower tables, because who doesn’t want more HP? What we found was plenty of power to be made on the K1600 with small modifications that are still very, very safe and conservative, not to jeopardize the longevity of the bike. We found HP gains of +18HP with a climbing HP curve from 5000RPM to redline. We did this by modifying the throttle which is stuck at 75% max opening in factory configuration and torque along with light changes to ignition timing and torque along with other tables that have proven to work great in the BMW tuning world. We found exactly what the K1600 engine likes with many revisions and hours of testing. It likes these changes without any stress, heavily advanced timing, or lean mixtures.

We achieved this through a few (simple) modifications:

The 2014+ have multiple torque limiters that starts to taper lower after 5500 rpm (mimicking the factory hp chart). BMW adjusts them all differently from the 2014 motor. This can be set to 100% power.


As you can see in the software screenshots below, the ECU is only commanding a fraction of what the engine is capable of outputting.  There are many reasons for this that may include sound regulations, emissions regulations, EU4 compliance, etc.  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.


The top speed limiter we can adjust to the GTL spec of 138-140MPH (per our findings and testing), or fully remove completely.

We have mapping for 89, to 93 based off ignition and fuel testing. 91+ works best from our testing.

Finally, we worked out the throttle. Many complaints have revolved around the dull throttle. We had multiple customers say they wish they could make the throttle like that of their 2014-15 BMW K1600. What we did here was overlay the 2014 style throttle maps with the 2018 bike. We found what was different and changed them over to the 14 style on our test bike. It is 38% softer for the 2018. Thankfully the 2014 settings work on the 2018 without issue. We took it out on the street for a long ride and it was completely different, huge improvement.

For our customers worried about warranty, we heard you loud and clear. We have tested this with our in house OEM BMW dealer tools and found that this flash is UNDETECTABLE at a dealer level! This file was tested with ISTAP for red flags, coding, and codes remain identical to stock, as does modifications to the ECU. The top speed limiter does not throw faults.


How it works:


You will order from our website, we will send you a product order form. The ECU will need the be mailed to our headquarters which is noted on said product order form. In the box you will need to include that order form along with a paid order invoice. Once we receive, we will flash the ECU and send it back within 48 hours M-F. Install the ECU and you are good to go! Adaptations are not needed to be reset on this motorcycle unlike some other bikes we tune, this means great power and ridability in all circumstances without any additional tools.

In regards to questions pertaining to riding modes: All riding modes still work as designed, 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.

Shipping on the website is for RETURN shipping, this is the shipping cost and speed to get the ECU back to you via UPS. You will still need to pay to get the ECU to our headquarters.




Customer Testimonial:







Additional information

Weight 10 lbs
Dimensions 15 x 15 x 15 in

1 review for 13-16 BMW K1600 BMSX (Mail-In ECU Tuning)

  1. Rated 5 out of 5

    Charlie Garalis

    First let me say I know this a long article and in the day of “memes” odds of anyone but the most serious will take the time to read it all. But that’s OK, that’s who I’m addressing. BUT, if you want to “cut to the chase” scroll down to the “Summary” section.
    Well, if that isn’t the first and probably best question. See, I had a 2015 BMW K1600 GTL. When I traded it in it had 55K miles that I logged in 3 years. The bike was simply a rocket ship. I’m not a high end top speed type rider. Sure I’ll “do the ton” (>100mph) from time to time. But it’s fairly rare. What makes me giggle is a great handling bike that will JUMP when I say go. I purchased the BMW Grand America (2018) without taking a test ride. I know, silly boy. But it was the SAME engine that I had just rode for the past 3 years. The bike had not hit the showroom floor yet but after falling in love with it during the motorcycle show I had to have one. On delivery day, before I even left the showroom floor, I knew something wasn’t quite right. I was able to tell the throttle response that I so loved was gone gone gone. After many calls, visits to the shop, emails to every email address I could find I learned that the response was taken away in favor of passing the European emission standards. Well, dang! Hey, I don’t live in Europe how about giving us State side a “free pass”? No such luck. So, that’s my motivation to find a “fix”.
    Booster Plug
    Someone told me about a product that would cure all my ills. It’s the “Booster Plug”. It simply “fools” the bike into thinking it’s colder outside than it really is. So, the fuel adjustment was to make up the difference and I would be a happy camper once again. Well, WRONG! IMHO it did absolutely NOTHING. Now I know some people think it’s the “Bees Knees”. I think it’s closer to Snake Oil. So, the search for cure went on.
    ECU Tuning
    I found many conversations around “tuning”. This is a process that they remap/reprogram your bike’s brain. Knowing that the engine in my 2018 was the SAME engine that was in my 2015 I knew the power was lurking in there someplace. But not only was there nobody (that I could find) that was tuning the K1600 it was quite frankly pretty scary. Even if your child isn’t perfect, do you just send her in for brain surgery in hopes of an improvement at some level? I mean, your kid may be ugly as sin, but you still love it. Right? You can love an ugly kid. So, although I felt like I had an ugly baby, it was MY ugly baby. But still, getting beat off the line by a Gold Wing was still quite embarrassing. I mean, I “saved face” by saying I’ll get him by the time we get to 2rd gear… but DAMN IT! On my 2015 all they ever saw was my bouncing top box within a fraction of a second of seeing the light turn green.
    They did it!
    Next thing I know someone in our Grand America Facebook Group ( said he just dropped his bike off at Bren
    Tuning for a lobotomy. WAIT WHAT??? What are they going to do? How are they going to do it? How long is it going take? AND HOW LONG BEFORE YOU CAN TELL US IF IT WORKED? Next thing I know the initial post op reports were all positive. Not only did the patient survive the surgery she came out feeling like a whole new person (I mean bike). Then they posted a video showing that pesky top speed limiter was gone. Now it only shuts down at redline; which of course is something you would always want. And the scouting reports said the throttle response was incredible.
    Do it Yourself!
    Next, I learned from the good folks at Bren Tuning, not only could the surgery be done as an “outpatient” basis I could do the lobotomy myself and just ship them the brain. So, I had a heart to heart with my girl. Told her it looks like she may be like the “Scarecrow” in the Wizard of Oz and be without a brain for a short time. But when we get your brain back you will be the smartest kid on the block. She reluctantly agreed because deep inside she really wanted to run as fast as her older cousins. It took all of about 15mins to yank out her guts and stuff them in a box for shipping to Bren Tuning.
    The Wait is Over
    The big day finally arrived. The reprogrammed brain arrived as promised. It took even less time to install it than it did to take it out. Of course, I didn’t even put the Tupperware back on before I punch the starter button. When I first twisted the throttle I was a bit concerned. The RPMs still weren’t just jumping off the page. So, of course, I made sure nothing was dangling around too much and I took her for a spin around the block. Before I hit second gear I knew that WE HAD A CURE!!! That throttle response from my 2015 was back! OH and the ride modes actually are meaningful! “Rain” is well basically how the bike felt before “tuning”. “Dynamic” is a rocket-ship and “Road” is somewhere in the middle. Exactly the way it is supposed to me. I put the Tupperware back on and took it for a second confirmation spin. WOO HOO!! I have fell in love with the bike all over again.
    OK, so to address the elephant in the room. Ya, I am a little concerned about how modifying the ECU could impact the warranty. Right wrong or indifferent here’s my view. These engines are pretty solid. The tuning isn’t doing anything crazy. In fact, it is VERY conservative. The tuning didn’t do anything more than what came stock on the K1600 just a few years ago. Now, I suppose if you asked for more, they could do it. But then I would agree you are risking breaking something. But what kind of risk is there if you aren’t doing anything more than what the manufacturer was doing before they had to comply with emission regulations? Could it all go to Hell in a handbasket? I suppose, but I rode the stink out of my last K with no issues and I have logged 15K on this bike. And I think that’s pretty much the norm for most owners. The icing on the cake is that, from what I understand, the changes made are invisible to BMW. One other downside; if the shop hooks her up to the BMW mothership and reflashes the ECU, well your tuning is erased and you will have to ship it back to Bren Tuning to be redone. They will, as you would expect, cut you a break on pricing to get it redone. But, it’s not free and you are without your bike (again) while the reprogramming happens. So, best thing you can do is tell the shop NOT to re-flash you bike. Tell them you like the way it rides and don’t want any updates. They should do as you asked.
    To Summarize it all
    If you are happy with the performance of your bike, then don’t do it. But, if you have a newer K1600 GT/GTL/B/GA and you aren’t so happy with the “dumbed down” throttle response well you have an option. If you have a newer bike and you don’t know what I’m talking about I urge you to take a “older” K out for a ride. Find a 2014 or a 2015 and take it for a spin around the block one time. I’m not saying you will necessarily like it better. Many are very happy with the lower throttle response. It is smoother and a lot less “jumpy” (which probably means the same thing). For me I miss having to fix a dislocated shoulder after every green light and my tires are lasting way too long. With this update I have the machine I thought I ordered a year ago. Which makes me a very happy rider.

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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 BrenTuning 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 Brentuning 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 Brentuning 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 Brentuning 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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