Stacks with poorly shaped bell mouths or incorrect taper will show a noticeable loss in torque (and horsepower) across the power band. Our own testing at BGRS has revealed that the length and shape of the velocity stack plays a very important role over cylinder filling at various RPM's. Tremendous gains with 100mm or longer stacks Smooth transition from base of stack to throttle body. Weber, Dell'orto, Mikuni Solex carburetor applications as well. ***DISCLAIMER: FOR CLOSED COURSE COMPETITION USE ONLY.SQ Engineering Pro Aluminum Velocity Stacks for 4AGE (16/20V) and 3SGE Beams applications. RED = Stock airbox, cammed, headwork, 93 pump gas – 199whp / 88wtq 2010 BMW S1000RRīLUE = BT Moto Velocity Stacks, 15-19 center stacks inserted, cammed, headwork, 93 pump gas – 205whp / 4 4wtq 2010 BMW S1000RR This power curve now more closely matches the 2015 – 2019 S1000RR. See the BT Moto stack power curve, there’s a significant amount of powerband where the stacks make more power, most notably at the midrange and top end. You can see from the dyno chart below the gains are pretty significant. RED = Stock airbox, 93 pump gas – 182whp / 81wtq 2010 BMW S1000RR with exhaust / basic flashīLUE = BT Moto Velocity Stacks, 15-19 center stacks inserted, 93 pump gas – 188whp / 84wtq 2010 BMW S1000RR with exhaust / basic flash The 2015 – 2019 center keeps midrange and top end in check on an average 200hp engine.Ģ015 – 2019 S1000RR’s just need the lower funnels installed and some fuel adjustments between 12,000-redline set rpm. Without the 2015-2019 center stacks, utilizing the lower funnels alone on a 2010 – 2014 S1000RR will not result in gains (as-is) without being a built motor 215+whp that supports that sort of airflow. This will include the entire airbox as the stacks are not sold separately. If you need to purchase the airbox from a 15-19, the part number from BMW is (13718561315). **IMPORTANT INFORMATION**įor near stock engines (sub 215whp), a 2010 – 2014 S1000RR will need to use a 2015 – 2019 airbox as a donor, by removing the center stacks from that model and applying it to the 2010 – 2014, along with our lower funnels. Ideally for or those who are flashed and do their own fuel tweaking. Power gains are determined by proper AFR, so do your due diligence and not a “set and forget” it. DO NOT buy this product without AFR (air/fuel ratio) verification or custom tuning (extra fee). The product will work with a stock motorcycles, flashed or unflashed, a piggyback fuel tuned bike, etc. It’s roughly 7% at 12,000 RPM, interpolated to 18% more fuel at the RPM limiter as a baseline. The shorter tuned stack gives the bike a unique and more aggressive induction sound and helps keep breathing easy at higher RPM’s.įor this product to work as intended your motorcycle will require custom tuning. This is a must have for full bolt-on bikes, or race engines. Our lower funnel kit gives the BMW S1000RR that little extra midrange and top end that could be the difference between first and second place when stacked up to an equally modded S1000RR. Our in-house dyno confirmed our suspicions as these stacks did not make more power than the stock configuration. This is a telltale sign that it did not change airflow. The other 3rd party stacks appeared to lose power and did not alter the air/fuel ratio at all. As a result some 3rd party stacks actually lost horsepower over the stock configuration. The 3rd party stacks were also designed too wide and rubbed/hit the adjustable stacks connecting arm for the servo motor and locked the adjustable stack at a “neither open nor closed” function. Due to this we avoided this rubber gasket design. These 3rd party stacks utilize the OEM rubber grommets and tend to collapse under extreme RPM’s and high airflow. They appear to be made without any sort of testing or consideration for long-term durability. What we found was the current market offerings are pretty disappointing. We studied the current market and tested other 3rd party velocity stacks and found flaws that needed addressing. After studying the differences of all these units, before and after data, and dyno data logging, we were able to create a scalable solution for race use with the factory airbox. Some of these changes were introduced for more midrange, top-end, race use and so on. While an extremely popular modification with Japanese bikes, BMW bikes always missed the mark with their adjustable factory geometry, and intricate airbox from the factory.Īs some may notice BMW has changed the airbox several times over the past decade and offered a racing airbox for their HP4 Race series and WBSK bikes. **Custom fueling adjustments with a fuel controller (like power commander, etc) are REQUIRED to receive advertised gains with this product**įinally after a year of in-house research and development, a proper velocity stack for the 2010-2019 BMW S1000RR.
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