In 1986 Ferrari launched a two-litre, turbocharged and intercooled variant of the 328, designated simply GTB Turbo and GTS Turbo. It replaced the 208 GTB/GTS Turbo. This version was developed specifically for the domestic Italian market, where cars with a displacement of over 2-litre like the 328 were subjected to a 38% value added tax, up from the normal 18%.[2]
The turbocharged Tipo F106 N 000[3] V8 was evolved from the 208 Turbo's engine, chiefly by adding an intercooler and adopting a new turbocharger. Displacement was unchanged, at 1991 cc with a bore and stroke of 66.8 mm (2.6 in) x 71 mm (2.8 in); there were four overhead camshafts driving two valves per cylinder; Bosch K-jetronic mechanical fuel injection was carried over from the 208. Whereas 208 Turbos had used a KKK turbocharger, these new 328-based cars used a water-cooled IHI unit running at 1.05 bars (15.2 psi) of boost.[2] Charge air was cooled by a Behr air-to-air intercooler mounted on top of the engine. Peak output was 254 PS (187 kW; 251 bhp) at 6500 rpm and 328 N·m (242 lb·ft) at 4100 rpm;[3][2] maximum torque was reached 700 rpms earlier than on the 208 Turbo, making the engine more tractable at low revs.
Other than the engine, differences between the two-litre Turbo's and regular 328's were minimal. A NACA intake positioned just in front of each rear wheelarch ducted air through a tube to the intercooler. A redesigned engine cover was needed to accommodate the top mounted intercooler. The rear bumper sported five ventilation holes. A black roof spoiler, optional on the 328, was standard. Inside a boost pressure gauge was added to the instrument cluster.
According to the manufacturer top speed was 253 km/h (157 mph) and took less than six seconds. In June 1986 Italian automobile magazine Quattroruote published a comparison test between a 328 GTS and a GTS Turbo. Despite the differences between the latter's more powerful 48-valve atmospheric engine and the former's torquier but peakier turbocharged 24-valve engine, performance was found to be quite similar in both acceleration and top speed. The Turbo sprinted from 0-100 km/h in 6.6 seconds (a tenth of a second behind the 328) and covered the sanding kilometer in 24.6 seconds, two tenths behind the 328. Quattroruote recorded a top speed of 251 km/h (156 mph).[2]
During the production period between 1986 and 1989 Ferrari made 308 GTB Turbos[3] and 828 GTS Turboshttp://en.wikipedia.org/wiki/Ferrari_328#GTB.2FGTS_Turbo
