Fsomething special. Sohn followed through on that like a pro’s golf swing.
“Almost every single part on that car has been swapped,” laughs Sohn. “I really can’t think of anything other than the body, dash and engine wiring harness that is original. Literally everything else, even the subframe, has been replaced.”
Under all the hoods of Sohn’s rotary-equipped cars, each engine has only been touched by two people: Sohn’s and his engine builder, Luis Canizales. Sohn is very particular about who he lets touch his cars, especially when it comes to the Wankel powerplant, so back when he was looking for a suitable engine builder, he would bring an iron from a torn down engine with him to see if the builder could figure out what was wrong. Canizales was the only one to identify that the coolant seal was missing. The fact that he has over 30 years of experience didn’t hurt either.
“With this engine, I wanted to put my hands on it, so I went to Luis’ shop and he helped me spec it, I did the clearance on it and then he helped me assemble it,” Sohn says. “Actually, for my second date with my wife, I took her to my engine builder.”
The 13B utilizes rotor housings from a late-model Japanese FD and the intake manifold from a tworotor Eunos Cosmo. The Cosmo’s two-rotor intake is actually fairly common among RX-7 enthusiasts chasing higher horsepower numbers because the intake runners are about 25-percent larger on the secondary. Sohn’s iron’s intake ports are matched to the Cosmo’s two-rotor, and there was even an adapter custom designed to fit the pieces together without modifying the throttle body or relocating the oil filler neck.
To take advantage of all the new air opportunities available, the FD is running a single Garrett EFR 8374 turbocharger in conjunction with a Turblown cast stainless steel manifold kit. The resulting power is put to the ground through use of an Exedy twin-disk clutch.
As Sohn likes to get his cars on the track as often as possible, that magical Dorito power is almost put to waste if it doesn’t hit the track right. The RX-7