Ported Trick Flow Two-Valve Modular Engine Cylinder Head Install - Going All In

On the dyno, the car did as we expected-within a few pulls the 284ci mill produced 630 rwhp and 520 rwtq. Dez cranked the timing to 21 degrees, thanks to the octane enhancement from the Snow kit. With the meth flowing and the boost pressurizing the engine to the tune of 20 psi, the Stang screamed to max power at 6,800 rpm. And to add icing to the cake, these numbers were in SAE correction factor-like the other tests with this vehicle. Dez converted the numbers to STD and the power increased to 648 rwhp. Some shops utilize the STD correction factor rather than SAE. The difference between the two is how the computer converts the data based on a pre-determined weather condition. SAE converts the actual weather and power results to read as if the car was run on the dyno during a day with an air temperature of 77 degrees and a barometer reading of 29.23 InHg (99 KPa). The STD correction works off the weather model of 60 degrees and a barometer of 29.92 (103.3 KPa). STD will always read higher than SAE because it is correcting to a day representing cooler, drier air. Both correction factors use a humidity reading of zero. It's important to note that the automobile manufacturers such as Ford, use the SAE correction factor when testing.

The boost soared to 20 psi, which might not seem like a lot considering our big jump in pulley size. But it is actually a pretty good number considering we opened up the induction side with a larger intake and higher flowing cylinder heads. The induction upgrades provide less restriction, which in turn lowers the boost if the pulleys aren't changed. The reason is because boost is simply a measurement of restriction in the intake manifold (where the pressure is measured in most applications). By providing a freer-flowing setup, the same blower speed would show a lower boost reading despite providing the same amount of airflow. We increased the blower speed and saw three more pounds of boost on top of what the engine probably lost due to the new intake and heads.