09/07/2025
Below is an attached dyno graph of a 2017 Gen 1 Toyota Hilux 2.8 GD-6 running only an aftermarket exhaust supplied by none other than our BoosTech Johannesburg branch.
However. This isnt my normal advertisement of specials post.
I would like to go on about a little rant really quickly.
We don't usually go about dynoing vehicles and showing off numbers on a screen because I for one firmly believe that real world performance on the street matters more than what a measuring tool can display on a computer screen.
But nevertheless, we are extremely capable of producing results both on street and the rollers, so, below I've attached a before and after run in both flywheel figures and wheel figures to help explain my argument.
A dyno is a measuring tool and at the end of the day its a machine that can be manipulated, im here to put the "ambient" correction argument to bed:
"Ambient correction" adjusts dyno results for temperature, humidity, and pressure. The SAE J1349 standard corrects power output by up to 5-10% in typical conditions. Corrections above 15% are suspect, while 20% or higher are likely inaccurate. Accurate correction ensures reliable results. Basically a higher positive number in ambient correction means a more generous power output and display of figures ON THE DYNO.
Notice how this sheet reads -2% and -3%. There is a NEGATIVE correction, meaning this is actually understating how much power and torque this GD6 actually made. Needless to say our client is smiling and is happy with his new found performance and better optimized map that will not only retain the OEM reliability but also save him money in fuel and put smiles on his face.
NOTE : The speed differences between the two graphs is purely so I could show my client how the torque gradually tapers off instead of falling on its face as displayed by the stock curve. This is a 2017 6 speed manual transmission Toyota Hilux 2.8L GD-6
Thats my rant, good day👍
