Please note: A few of the tips and features described below will only apply to the latest DYNOmite-Pro board set equipped systems! However, you may be eligible for a discounted or free upgrade. Click here for details!
Too little Hp when you know it must make more? Try these suggestions:
Tip: This issue is rarely a dynamometer calibration issue (for example, its rare to hear questions about calibration for too little Hp)! So, check things like the entered gear ratios, torque arm source, and weather correction data. Beyond that it is most likely the engine is not making the power.
If the engine itself is right, one common mistake made by novice dynamometer operators is letting exhaust get into the engine! It takes only a tiny bit of exhaust to seriously pull down power! By the time your watering eyes make you think about exhaust issues, you can be down by over 50%. It takes a high-volume (and high-horsepower rating) fan to purge an indoor dynamometer test cell. Do not underestimate its size!
Too much Hp when you know it can't be true? Try these suggestions:
Tip: This hardly ever happens, but if it does, check things like the entered gear ratios, torque arm source, and weather correction data before you bother re-checking your calibration.
Fuel flow and BSFC fluctuating quite a bit even during steady state testing? Try these suggestions:
Tip: Because of the uneven demand characteristics of float bowl needle and seat controlled fuel delivery (especially on engines that vibrate the carburetor bowls a lot) the fuel being delivered into the engine at any instant may not match that being delivered into the bowl. Since the transducer is actually measuring the delivery into the bowl, it is necessary to average the fuel flow over a long enough period of time for the two flows to match. Generally, flow numbers that are averaged over less than one second are not a reliable indication of exactly the amount of fuel that made it into the engine. This is not a function of the accuracy of the DYNOmite or transducer. Note: fuel injected engines are subject to pulsations in the fuel line which can give similar (but less severe) problems. In all cases, the readings get more reliable as averaging time (and flow) increases.
Trying to mount a fuel flow transducer on an injected engine with a separate bypass return line off its fuel regulator? Try these suggestions:
Tip: You must place the transducer between the regulator output and the fuel injector(s). If you install it before the regulator you will only be reading the continuous full flow of the fuel pump. A Land & Sea technician can give you some tips on working this out. However, if you also have DYNO-MAX and more than one DYNOmite board pair set, you can simply run a second transducer in the return line (and have DYNO-MAX subtract flow from the other).