Dyno charts are a great way to showcase modifications performed to your vehicle, as well as a way to advertise a performance companies abilities to achieve higher hp ratings.
Now as we all know, (and as discussed in the sticky above) there are variances between specific types of dynos that will affect the outcome of the dyno run as well as: Tire rolling resistance, strap tension (not a variable on a dynopac obviously), engine and oil temps, and atmospheric conditions (to a point, you always want to read the corrected power figure as the dyno computer is using a SAE based algorithm and a weather station to correct for the most part).
But what about the chart itself? Can a company 'fluff' it, or modify it in a way beneficial to them? Of course they can. Always be very attentive to whether or not the chart crosses at 5252rpms (or very, very close). If it does not cross here, the scaling between torque and horsepower are not equal and the chart will have one visually higher than the other, which is not the actual case. Another way of altering it is through the smoothing factor as shown in the picture below from a well known tuning company. As quoted from Mustang dynos, "Heavy smoothing values (>50 in “FIR” mode, > 90 in “IIR” mode) can hide transient values that may be important indicators of your vehicle’s performance."
So in short, pay attention to charts and see if these two issues are present. If so, you may want to re-evaluate a company's claims.
Now as we all know, (and as discussed in the sticky above) there are variances between specific types of dynos that will affect the outcome of the dyno run as well as: Tire rolling resistance, strap tension (not a variable on a dynopac obviously), engine and oil temps, and atmospheric conditions (to a point, you always want to read the corrected power figure as the dyno computer is using a SAE based algorithm and a weather station to correct for the most part).
But what about the chart itself? Can a company 'fluff' it, or modify it in a way beneficial to them? Of course they can. Always be very attentive to whether or not the chart crosses at 5252rpms (or very, very close). If it does not cross here, the scaling between torque and horsepower are not equal and the chart will have one visually higher than the other, which is not the actual case. Another way of altering it is through the smoothing factor as shown in the picture below from a well known tuning company. As quoted from Mustang dynos, "Heavy smoothing values (>50 in “FIR” mode, > 90 in “IIR” mode) can hide transient values that may be important indicators of your vehicle’s performance."
So in short, pay attention to charts and see if these two issues are present. If so, you may want to re-evaluate a company's claims.