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Our friends at Creations N' Chrome in Valencia, California have been doing plenty of testing on their dyno in the past few months and recently took delivery of a 2013 Mustang GT for a build and some data acquisition. Chris Mayte, Head of Marketing at CnC, sent over these graphs and an explanation of the test they did to help show what a difference using lighter wait HRE Competition forged wheels make on the dyno.
"We just finished running a bone stock 2013 Mustang GT on our Dynojet 224xLC. This dyno is capable of making a "negative power" run. Basically, it measures the drivetrain loss. I have attached a graph showing dyno runs of a 2013 Mustang GT with stock wheels and with HRE Comp 95 Wheels. This particular Mustang has the Brembo option which comes with 19x8.5" wheels and 255/40/19 Pirelli P-Zero tires. After running the car stock, we then swapped the factory rear wheels out with HRE Comp 95 Wheels in a 18x9 size with a wider than stock Falken RT615K 265/35/18. The dyno runs were made within 1.5 hours of each other. Air temp was about 80 degrees for both runs. At the bottom of the large chart as well as the zoomed in chart that I have attached, you can see two lines that hover around the -20HP line. These lines represent the drivetrain loss recorded during deceleration of each dyno power run. You will note that with the stock wheels, the drivetrain absorbs about 22 horsepower. With the HRE Comp 95 wheels, the drivetrain is absorbing about 18 horsepower. Also note that although there is a roughly 7 horsepower difference in the power runs, there is only roughly a 4 hp difference in the negative runs. I suspect that is because the power run is measured during acceleration, while the negative run is measured on deceleration, recording two different events."