Preferred Dyno Pull RPM Range w/Data

[AL427SBF]

You guys are reading way too much into this, not looking for a validation, just asking some questions. Different builders/racers = different opinions and we've already seen a couple between Brent, Barry and David.

I think you guys exhibit some old school thinking the customer just wants a peak horsepower/torque number so they can feel good and tell their friends. Early dynos were good at that but not much more, well dyno tech has evolved - particularly those with servo load flexibility.

Some test modes available in current dyno tech -

a. This mode is ideal for drivability tests and diagnosis of load related problems such as hesitations and misfires. By inputting a fixed load level (think of it as an infinitely long hill, where you can adjust the steepness of the grade) you can vary the rate of acceleration at will. This load is consistently repeatable and has a very fine degree of adjustment. The load value ranges from practically no load at all, to a maximum load that will stall just about any vehicle. You can now accurately adjust “tip in” fuel or accelerator pumps or any other “transient response” type of device - and any other parameter where rate of acceleration and load is an important factor in recreating the real-world experience.

b. In this mode, you select a specific RPM point where you want to hold the vehicle. We will continuously vary the load to hold the RPM at that point within one RPM at the axle. As long as you are above the minimum throttle setting that is required to achieve that RPM, you can apply as much throttle as you want and the RPM will not rise above that point - all the way up to the full maximum rated torque capacity of the dyno. The dyno will then display the real-time torque and horsepower being absorbed, as well as other real-time relative data.

c. We can precisely control the rate of acceleration to your specification. This is extremely useful for tuning purposes. We also hold the vehicle RPM at the starting point (called initial settling time) for a user specified period of time so the vehicle will be stabilized before starting the run. Once the dyno releases and allows the vehicle to accelerate, it will be perfectly consistent in doing so every time.

Most people would like to know how their motors build power over the drivable RPM range, who wouldn't. The equipment exists and you don't have to "pull the guts out of it" to get that info. I think the real root cause of our opposing opinions here is the ability/capability to provide broadband power information safely. Is your dyno dated? If so, maybe time to dump that obsolete POS and join the 21st century