Option — Shōwa Car Tuning & Buyers Guide (2000 Edition)

The result became a 700-PS monster, but the transmission could not take it, so a Trust six-speed from an S13 Silvia was installed. At the drag start, wheelspin is a storm—ARASHI! The suspension is not yet set up in a modern way, so the current time remains in the 12-second range. The plan is to control boost in stages using an EVC or MoTeC instead of the mechanical VVC, to improve traction. The base is old, but the approach is the latest—a reverse “Urashima Taro” S30Z.

This immaculate S30Z is a 1972 model , and the owner has had it for ten years. It is a lovingly maintained build. Aside from paint, the owner does all work himself; anything unavailable as a part is custom-made. It is a drag setup, with a classic L28-based 3.1-liter engine making 330 PS. Weight reduction is thorough: the hood, fenders, and doors are FRP. There is no roll cage, which raises concerns about rigidity, but the owner says he has learned to drive around it. The current quarter-mile time is a flat 12 seconds, very strong for a naturally aspirated car. The goal is to change the differential and gearing and reach 11.8 seconds. This is a fully competitive drag machine!

Ancestors: Showa-era cars.

…evolved into a K3T twin-turbo setup…

…the fuel injection, developed over ten years… [fragment].

The owner simply loved Z cars. He began tuning this S30Z with a carbureted turbo… [continues].

The muffler has a 95 mm main pipe and 100 mm tail, custom fabricated. Keeping the stock fenders is the owner’s preference.

…with a forged crank, displacement is 2,833 cc. The injectors… [technical sentence continues].

Cosworth 88 mm pistons, I-beam connecting rods, six 720 cc main injectors plus six 444 cc additional injectors, and two K3T turbos controlled by MoTeC. A 700-PS output is astonishing!

L28-based 3.1-liter S30Z.

At first glance it looks like stock maroon, but look closely and you see red pearl mixed into the paint. It combines nostalgia with something new.

Lightweighting and mechanical tuning make this a 330-PS drag car that is still going strong!

The owner bought pipe and welded it into a custom exhaust. The fenders… [continues].

The rear spoiler was made by an FRP shop. Rear tires are 225/50-16 520S on 9.5-inch Panasport G7 wheels.

The muffler… [caption fragment].

The L28-based 3.1-liter engine uses an 89 × 83 mm bore and stroke, 12:1 compression, FT500 pistons, L14 connecting rods, and an LD28 crank. With 50 mm Solex carburetors and 80-degree cams, it produces 330 PS at 7,800 rpm…

Option

…are finished.

Option — Shōwa Car Tuning & Buyers Guide (2000 Edition)

About this issue

Page 163 — English draft translation