Option — Shōwa Car Tuning & Buyers Guide (2000 Edition)
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About this issue
180 available scans from Option — Shōwa Car Tuning & Buyers Guide (2000 Edition), in right-to-left reading order. Japanese OCR and English translation drafts are available throughout. Drafts have not received exhaustive image proofreading; unreadable source remains recorded in the archival data.
Page 112 — English draft translation
The GTI-R's SR20DET is designed for high revs and can accept a larger-flow turbo than the same engine in a Silvia. But the cramped engine bay limits the available choices. Garage Fukui selected HKS's GT3037S: compact but capable of high airflow. It is paired with a custom exhaust manifold and 268-degree cams. This setup produces about 420 PS from the SR20, and with four-wheel drive the goal is naturally to become the quarter-mile king! (0776-67-2980)
This HRF-built GTI-R has Trust forged pistons and H-beam rods, Tomei 272-degree cams on both intake and exhaust, and a TD06-20G turbo. At up to 1.8 kg/cm² it is estimated to make over 430 PS. The stock engine already has high-power parts, but serious quarter-mile tuning requires stronger components. The stock transmission's limit is surprisingly low and no reinforced unit is available. Around 400 PS is the warning zone; 500 PS is likely dangerous. This engine could use a TD06-25G, but the smaller turbo was chosen to protect the gearbox.
Captions and page details
Although the engine is designed for high rpm, its top-mounted intercooler does not cool well. Moving it to the front is a standard step before changing the turbo.
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A compact GT turbo brings out the high-revving engine's potential!
The GTI-R SR20DET uses four throttle bodies to provide airflow at high rpm. A GT3037S is fitted with a high-lift cam and a 12 mm gasket. The main injectors are upgraded to 720 cc, and a Z32 airflow meter is used.
A front-mounted intercooler is the first step in tuning a GTI-R. The stock top-mounted unit cannot receive fresh air, so in summer intake temperatures can approach 100°C and power falls away.
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Unless the car is dedicated entirely to quarter-mile racing, this is arguably the best setup. The engine has Trust forged pistons and H-beam rods, plus Tomei 272-degree intake and exhaust cams. It uses a Z32 airflow meter, a factory GT-R fuel pump, and 550 cc injectors, matched to a TD06-20G.
GTI-R power upgrades matched to the transmission's strength!
The muffler is a one-off 90 mm unit made by HRF (097-567-9251).