JUN Machine Shop has added the GT Surge Tank for Toyota FT86 and SUBARU BRZ. Now it is on sale.
We considered the characteristics of the natural aspiration engine for making this surge tank. Then we paid attention to inertial supercharge properties of the intake manifold to make use of a quality of the natural aspiration. The inertial supercharge peaked in the stock in about 7200rpm, but we calculated a port cross section and the port length and designed it in about 8000rpm to become greatest. In addition, we attach funnels to each branch in the surge tank and note the distribution of each cylinder.