As per usual when we perform dyno evaluations at GTR High Performance, Grant Gross's '08 Roush 428R Mustang was baseline tested on the Dynojet chassis dyno prior to installing the Snow Performance MPG-Max Stage 3 Boost Cooler system.
With 91-octane fuel, the supercharged Pony maxed out at just over 400 horses at the feet using 21 degrees of timing advance at the top of the run. As you see in the dyno hit labeled Snow (91-octane fuel and water/meth), Chris Jones of Blow-By Racing was able to add a considerable amount of timing advance, yet still maintain a safe air/fuel ratio of 11.1 and increase power, largely in the midrange section of the rpm band (3,500-5,000 rpm).
In most instances, power gains with water/meth are seen at the upper portion of the dyno run. With the assistance of Matt Snow, our final test (Snow 2) was made after making additional timing adjustments, leaning the fuel mixture, and trying a larger injection nozzle. As the data shows, an additional power gain resulted from the changes; once again in the midrange.
While we're pleased to see water/methanol do its thing with boost and making horsepower, we're more impressed by the blower and Three-Valve engine's response to the mixture on the torque side of the equation. A larger supercharger, such as the aforementioned 2.3-liter Roush TVS that we installed on JC Cascio's S197, certainly will benefit from water/meth in the high-rpm/high-boost area. However, for our exercise, the dynamic gain is marked torque increase--low-end grunt, which is exactly what Grant will experience every time he punches the pedal to the mat.