2020+ BMW S1000RR IAT Kit and Software Intake Flappers



No More False Intake Air Temperature Readings

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Product Description



As many of our customers know, our IAT (Intake Air Temperature) Kit for the 10-19 BMW S1000RR has been extremely popular and shows noticeable gains on the street and even dyno.  This IAT strategy was first used by Dinan (BMW) in the 1990’s.  However, the 2020 S1000RR included some serious changes and required a new strategy for this project.

New for 2020 is our Intake Flapper Mapping.  The 2020 S1000RR now has flappers in the intake tract, these flappers only allow a small amount of air to pass through to the engine until 6000 RPM when the flappers finally open.  When the flaps aren’t open it allows for stagnant, hot air to raise IAT readings and block air flow to the engine.  Hot air and low airflow equals less power.  This is why we developed our IAT kit years ago.  The flapper mod is an add-on progression to the new model.  We developed a whole new IAT relocation kit as the harness that has changed from the 10-19 models.  All parts fit very snug and are made from billet aluminum for weight consideration and longevity.

The new airbox “flapper” design was made to reduce engine noise at low RPM’s.  Instead of the previous foam restrictor that we saw in the 17-19 models, the 2020 S1000RR almost completely closes off the airbox in certain scenarios.  This lack of airflow leads to very high intake temperatures.  The ECU’s strategy is designed around this “heat soak”.  Timing retard is based on a “per gear” and “per RPM” strategy and will not taper off until higher gears due to the airflow and RPM needed to open the flappers.  This is vastly different than previous years and more similar to the BMW GS1200’s (which also benefited greatly from this kind of relocation).  The first half of the throttle angles (0-50% throttle, commanded) and first three gears are heavily timing retarded on the stock calibration.  This is due to hot and stagnant air that sits in the airbox while the flappers stay closed.  The design of the OEM flapper servo creates an unnecessary bottleneck of airflow inside the airbox at higher speeds.  This distributes air to the inner most cylinders, negating performance and the maximum “ram air” effect the factory airbox can provide.

Our kits have been installed and successfully tested with positive reviews on the street and track!  The bike doesn’t feel as lazy from a dead stop anymore.  The induction noise is superb after the install and compliments the essence of what a S1000RR should sound like; a true race bike.  The IAT Kit allows for consistent power at all RPMs and gears instead of waiting for higher gears to get additional, rated power.  During our testing on the dyno and per gear / per RPM datalogging, we found many delays in the factory ignition to combat the heat soak the factory airbox flappers create.  With our flapper mod and relocated IAT sensor, the bike reacted sharp from a dead stop and in lower gears / speeds (pre-6000 RPM cruising) without knock detection.

Getting a true ambient temperature from the front of the bike is much better than getting temperature readings from its original location on top of the engine with the flapper doors shut.  Idling at the starting line, pits or at a street light on a 100 degree day will put the bike into a temperature protect mode and pull power out to “save itself” until the IAT sensor reads accurate ambient air temp once the bike starts moving.  True ambient temps help the bike deliver more power and stay consistent in racing conditions.  We are not tricking the sensor but simply allowing it to read proper temperatures of the outside air.

To see real world results of this, please see our video below


      • Relocates the Intake Air Temp (IAT) sensor and opens the intake flappers 100% of the time (through software).
      • Moves the IAT sensor from the factory location near the cylinder head to the front of the bike to get a true ambient reading.
      • Opens factory airbox flappers to allow fresh air to enter the airbox at any speed, RPM or gear.
      • A true ambient reading means more power but also means consistent power.
      • Noticeable improvements in stop-and-go traffic, starting a race from a stop and exiting the pit.
      • More air to the engine with plastic flappers opened.
      • No downside and dyno proven gains across the powerband (see dyno chart below).


      • New Mapping To Open Intake Flappers 100% of The Time The Bike is Running
      • (1) IAT Extension Harness
      • (1) Billet Aluminum Plug For Original IAT Sensor Location


IAT 110F vs. 60F test with and without removing airbox flaps and IAT relocation (tested on a 55F ambient day).  Bike used was a 2020 S1000RR using our stage 1 flash with exhaust and 93 octane fuel on all runs.

As noted previously, the 2020 has airbox flappers that stay mostly shut, feeding no fresh air and heatsoaking the bike’s airbox below 6000RPM.  The stock calibration has compensated as a result.  This is a back to back run after only relocating the IAT to the nose of the bike instead of its standard location.  This is much different than previous years ECU strategy.  We converted it back to previous years strategy to optimize performance.

As you can see both runs, before and after IAT install, have the same exact AFR (air/fuel ratio).  It’s a common misconception that IAT modifications adjust fuel.  They do not do that.  This bike is fully closed loop and hits our commanded lambda target every time due to BMW’s OEM wideband oxygen sensor technology.  You can see pretty steady HP gains across the entire RPM range. Converting it very similarly to a 2015-2016 style S1000RR airbox (derestricted years).  While the dyno graphs show gains, results on the street or track are actually better when you are hitting higher speeds and it creates a more noticeable ram-air effect.

**Testing performed with 93 octane pump gas. Usage of a lower octane will yield lower overall power.**

This video demonstrates the difference from factory stock, our flash with intake flappers open only, and our flash with intake flappers open and IAT kit for the BMW S1000RR.  This is the exact same motorcycle in all videos with temperature comparisons, showing the effectiveness of both the kits working together.


Total install time: 2 – 2.5 hours

Only watch the first part for IAT Kit install as the intake flappers will be opened through software



Additional information

Weight 2 lbs
Dimensions 10 × 10 × 10 in



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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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