Griffin Tools & Supply, LLC

Specializing in Undercar Products & Eco-Friendly Shop Supplies


Harley Davidson Engine Tuning

To contact us:

Phone:           (847) 651-3099

Fax:                  (914) 612-8945







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Smart Power Bench



Power bench for bike diagnostics and tuning

¨ Simulates engine load equivalent to road test •Gear 1

¨ Simulates double load for comfortable tuning measurements (VE maps) • Gear 2

¨ Provides measurements for both power and torque curves • Gear 1

¨ Facilitates measurement of VE maps for engine tuning

¨ Provides the opportunity to carry out engine diagnostics while under a load

¨ Utilizes built in fan for engine & rear tire cooling

¨ Embedded protection of rear tire


The Smart Power Bench, Motorcycle Dyno is the ideal product for dealers and repair shops that want to use the diagnostic and/or tuning capabilities of MS531-HD to their full extend, including simulation of a road test. The smart design with a heavy weight and large diameter roller with built-in cooling fan simulates engine load equivalent to a road test, provides data for both power and torque curves, facilitates measurements of Volumetric Efficiency maps for engine tuning and give the opportunity to carry out engine diagnostics while under a load. The Smart Power Bench does not feature an eddy current or other type of brake. Instead, it uses a drum-driven fan system, giving more resistance when the rear wheel speed increases. This clever design makes it an affordable investment for any bike shop. Measuring only 110” long, 20” high and 40” wide, it does not require much space in your workshop either.

¨ Weight: 550 kg (1213 Lbs.)

¨ Dimensions: 2,8m x 0,5m x 1m (W x H x D), 110" x 20" x 40"

¨ Roller diameter: 450 mm, 18"

¨ Mass moment of inertia of the system: ~12 kgm² (285 Pound foot²)- Gear 1

¨ Measurement range of engine power: 10 – 250 kW
At load, power input of the fan is mainly given by the built-in load fan, and is dependent on the engaged gear of the station (the following data is for illustration only) :
Gear 1
o 10 kW at 100 km/h (60 MPH)
o 30 kW at 150 km/h (90 MPH)
o 70 kW at 200 km/h (120 MPH)
Gear 2
o 10 kW at 50 km/h (30 MPH)
o 30 kW at 75 km/h (45 MPH)
o 70 kW at 100 km/h (60 MPH)

¨ Maximum driving speed (peripheral speed of the roller):
o Gear 1: 250 km/h, 150 MPH
o Gear 2: 100 km/h, 63 MPH

¨ Connection to PC: RS 232 or USB

¨ Required PC operation system: XP, W7, W8

¨ Power supply of the station: 230V AC or 12V DC with power of 24 W. Power supply can therefore be provided from a 12V vehicle battery.

¨ The operating temperature range of the station: +10 to +40 °C

¨ Cooling of rear tire: provided automatically by the built-in fan

¨ Temperature measurement of the rear tire: IR measurement

¨ Remote control: IR (infra-red)

¨ Measuring ambient air pressure: 870 to 1100 hPa (at sea level)

¨ The tuning system focuses on Harley-Davidson engines equipped with DELPHI EFI (diagnostic communication J1850 or CAN)

¨ The tuning system is based on the diagnostic system MS531-HD. The MS531-HD is a professional diagnostic tool for Harley-Davidson Motorcycles; the basic tuning software will be included as a free option in the diagnostic software Version 12. To tune an individual motorcycle a TUNING DONGLE must be purchased that can be used for that specific motorcycle.

¨ The tuning process does not require the installation of additional components or any motorcycle harness modifications. Tuning is based on the modification of EFI Calibrations (software modification) exclusively via the diagnostic connector.

¨ The first step in Tuning is saving of the original EFI Calibration. The tuning operator can restore the original EFI Calibration at any time during tuning process (stock calibration).

¨ The tuning process is used to optimize Fuel Maps in case of any changes to the configuration of engine components or accessories (exhaust or/and intake system etc.)


 Easy Manual Tuning (Adjusting). This method is the low cost tuning represented by EASY MODE in tuning software. EASY MODE provides the ability to adjust Fuel Trim table, Acceleration Enrichment, Spark Advance table manually in a limited range of +/-20%, switch On/Off Lambda Closed Loop and Throttle By Wire speed  up. Other functions are restricted.


 Advanced Tuning - Map Flashing from Database. By this method of tuning it is possible to use full range of the tuning functions. The method provides ability to use an embedded database of calibrations. These calibrations (maps) are pre-set for several configurations of exhaust and intake components (open exhaust, intake and combinations). Advanced tuning method provides important improvement of engine functions. during a Road Test


 Professional Tuning - Engine Fuel Maps Optimization. The key function here is VOLUMETRIC EFFICIENCY MAP MEASUREMENT under load. It means real VE maps measurement of each engine configuration.VE map measurement can be done on an appropriate Roller Station such as the SMART POWER BENCH, or during a Road Test on the street. Professional tuning method provides the best bike tuning for each special engine –maximum efficiency, torque and power.



This device is a basic component of the professional diagnostic tool MS531-HD. This interface was developed with a long term view to the future in diagnostics and tuning. It is still one device only for professional diagnostics and tuning of J1850 and CAN communicating motorcycle models. The purchase of the AFR TUNING MONITOR is only necessary if the Advanced Tuning option is desired.



This tuning software package is software that is embedded in the MS531-HD diagnostic software as a free option. The tuning menu is user friendly and equipped with a tuning guide


The key function of the Tuning Dongle is saving of the original EFI calibration. Thanks to this function the original calibration can be restored at any time. The tuning dongle also incorporates the tuning license exclusively for one motorcycle and must be purchased for tuning of each individual motorcycle and will be mated to the ECM of that motorcycle.


AT 531 4094.A            Easy (blue) Tuning Dongle     

Easy Tuning Dongle is supposed for EASY TUNING only, this dongle enable adjust of fuel map, spark advance map, acceleration enrichment +/- 20%, TBW adjustment saving of the original EFI calibration. The tuning dongle also incorporates the tuning license exclusively for one motorcycle.            


AT 531 4094    Tuning Dongle (Orange or Yellow)   

Tuning Dongle is supposed for EASY, ADVANCED and PROFESSIONAL TUNING, this dongle enable AFR, VE and Spark advance map adjustment, Acceleration enrichment, TBW adjustment, Flash of statistic maps, saving of the original EFI calibration... The tuning dongle also incorporates the tuning license exclusively for one motorcycle.


AT 532 4091    Tuning Dongle Pack 3 + 1 free (Orange or Yellow)

Special pack of 4 Tuning dongles for the price of 3 dongles

Tuning Dongel


The AFR Tuning Monitor is used for the advanced Tuning level and consist of two Wideband Air/Fuel ratio Sensors and a compact electronic unit. It is an option for the MS531-HD COMMUNICATION INTERFACE


Throttle control limiter is a useful option for VE map measuring. This tool helps in setting of constant throttle position during acceleration or deceleration.


This set is an option to AFR Tuning Monitor. It allows you to install a pair of wide band oxygen sensors on all exhausts where it is not possible to simply replace the installed oxygen sensors (M18 thread).

Installation targets

¨ Exhaust equipped with M18 fitting where there is not enough space for longer wide band oxygen sensor

¨ Exhaust equipped with M12 fitting oxygen sensors on newer H-D bikes

¨ Exhaust without any fitting The set contains a powerful double pump, which ensures high accuracy and measurement speed of real AFR in each cylinder. The pump is powered from 12V supply and can therefore be used also for a road test. All tools necessary (less drill) are included.


Used to connect AFR Tuning Wideband Sensors on bikes with open exhaust.