What is Dyno Tuning?
Dyno tuning a motorcycle is the process of using a dynamometer (dyno) to measure and optimize the performance of the motorcycle’s engine. During a dyno tuning session, the motorcycle is placed on a special machine where the rear wheel spins a heavy drum, simulating real-world riding conditions.
The dyno measures horsepower, torque, and engine RPM while also monitoring the Air-Fuel Ratio (AFR) — the balance between air and fuel entering the engine. A proper AFR is crucial for achieving the best engine performance, fuel efficiency, and avoiding damage to the engine.
The tuning process involves adjusting the fuel management system, such as using a fuel tuner or ECU reprogramming, to fine-tune the motorcycle's fuel delivery and ignition timing. This helps the engine run more efficiently, improving power output and torque where it's needed most. It also ensures that the bike is running smoothly across all RPM ranges.
Dyno tuning can also identify potential issues, such as problems with the clutch, speedometer, tachometer, or the final drive system, making it a comprehensive diagnostic tool in addition to performance optimization.
Overall, dyno tuning is about fine-tuning the motorcycle to unlock its full potential for performance, reliability, and efficiency, whether you’re aiming for more horsepower, better throttle response, or improved fuel economy.
proven dyno graph comparisons of Stach attack camshafts
114" stock
vs.
Stach Attack ST1 camshaft, De-catted header, high flow air cleaner, and 2 Boss Performance custom tune using a Dynojet Powervision license
How is this even possible?
Well...it is
114" stock
vs.
Stach Attack ST1 camshaft, high flow air cleaner, D&D 2-1 exhaust, and 2 Boss Performance custom tune using a Dynojet Powervision license
117" stock
vs.
Stach Attack ST2 camshaft, stock H-D high flow air cleaner (standard depth element), Bassani 2-1 full length exhaust, and 2 Boss Performance custom tune using a Dynojet Powervision license
107" stock
vs.
Stach Attack ST1 camshaft, High flow air cleaner, Decatted header, S&S MK45 mufflers (with DB reducer), and 2 Boss Performance custom tune using a Dynojet Powervision license
114" stock
vs.
Stach attack ST1 camshaft, Factory H-D high flow air cleaner ( With Ness Deep element), Decatted header, slip ons, and 2 Boss Performance custom tune using a Dynojet Powervision license
Here is some graphs displaying what all 4 current factory Harley engines make on our dynamometer.
107". BLUE
114". RED
117". GREEN
121" VVT. YELLOW