2019 X2; Stock Exhaust; Stock Clutch
I wanted to keep the stock exhaust for the quietness, so I didn't think I would see the significant gains as others with aftermarket, hence I regressed from purchasing the flash upgrade.
I could not of been more wrong.
I feel the Weller Racing tune has really hit the sweet spot on this 847cc parallel twin.
The fuel/timing improvements really bring this motor to life with what us motor heads call Peak performance.
This performance is noticeable throughout the entire RPM range and I don't notice any symptoms or indications of LOP (lean of peak) or ROP (rich of Peak). This tells me that they really hit the spot while also staying within safe operating parameters. Plus with Cooling fan activation lowered by 10 Degrees.
Even with the stock exhaust, this motor feels more powerful and responsive. What was surprising was it performed the same under a 'more load' condition. As I did several runs by myself, then took the wife and did the same runs again, I had the same results.
The Throttle and Drive by Wire adjustments also contribute to the above performance a lot, but I also want to touch on a few other noticeable areas.
If you have a X2/X4, then you know how annoying the throttle inputs/results can be.
Trying to find that peddle sweet spot either while driving on trails or doing controlled maneuvers in the tight and technical.
Even though I own and love my Throttle Max peddle for the comfort it provides and helps with the throttle issue as a 'work around', the Weller Racing tune has completely resolved any issues I had.
Their adjustments in this area not only remove any unwanted throttle fluctuating inputs, but also do not negatively affect throttle responsiveness. In fact, throttle responsiveness doesn't get any better in my honest opinion. I don't know how they managed to do it, but this alone is worth it's weight in gold.
I could go on about different driving scenarios with my results, but let's end with a quick summary.
I feel the Weller Racing ECU Flash has not only tuned the engine to Safe and Peak Performance levels, but manages to take the driver inputs and synchronize everything together to give the driver the best experience.
Reviewed by: Steven Kelley from Sistersville on 1/19/2020