The Alfa Romeo Giulia TZ (also known as the Alfa Romeo TZ or Tubolare Zagato) was a sports car and racing car manufactured by Alfa Romeo from 1963 to 1967. It replaced the Giulietta SZ. In 2011, the name was reduced from Giulia TZ to TZ in the new TZ3 model.
It has disc brakes and independent suspension. The result was a lightweight coupé of only 650 kilograms (1,430 lb) and top speed of 134 miles per hour (216 km/h). The TZ was built both for street and racing trim, with the latest racing versions producing up to 160 brake horsepower (120 kW). Alfa's twin-spark cylinder head, as also used in their GTA, contributed to the speed of the TZ; the standard Giulia alloy block with wet steel liners was installed at an angle under the hood of the TZ to improve airflow.
Aiding the TZ in its quest for performance was the treatment of the rear bodywork. Incorporating the research of Dr. Wunibald Kamm, the TZ used a style called coda tronca in Italian, meaning "short tail.", otherwise known as the Kamm tail. The principle is that unless an aircraft-like extended tail is incorporated, which is not practical for an automobile, there is little, if any, increase in drag and a marked decrease in lift or even some downforce by simply chopping off a portion of the tail. Zagato had previously proved the success of this tail treatment in their coda tronca Sprint Zagato sports-racing cars, and it was a natural evolution to adapt this to the Giulia TZ.
The car debuted at the 1963 FISA Monza Cup, where TZs took the first four places in the prototype category. At the beginning of 1964 the TZ was homologated (100 units were needed for homologation) to the Gran Turismo category. After homologation it started to take more class wins in Europe and North-America. Of the first TZ, 112 units were built between 1963 and 1965.
Only built as limited amount these TZ models are quite collectibles nowadays, listed price around 150,000-200,000 US dollars.
1,570 cc straight-4DOHC 112 bhp (82 kW) at 6500 rpm (road trim), 160 bhp (118 kW) (race trim)
A new version of TZ was introduced at the Turin Auto Show in 1964 in the Zagato stand. In order to reinforce the structure and further reduce the car's weight, Zagato replaced the light alloy body with an even more streamlined fibreglass body moulded tight to the chassis providing lower drag and reduced weight of 620 kg (1,370 lb). The new design was called the Alfa Romeo Giulia TZ2. The TZ2 was only built as racing version; it was equipped with an Autodelta-prepared twin plug, dry sump lubrication 1,570 cc (1.6 L; 95.8 cu in) DOHCstraight-4 engine producing around 170 bhp (127 kW) at 7000 rpm. With this engine the car reached top speed of
245 km/h (152 mph). The rear window was also changed, now single unit rather than three part window in TZ. Development of TZ cars was stopped in the end of 1965, to make room for the new Alfa Romeo GTA racing program. Only 12 TZ2s were built.
The TZ2 took class win on 25 April 1965 in the 1000 km of Monza, with Bussinello-De Adamich finishing seventh overall and first in the GT 1600 category. Also in 1965 it took class victories thanks to Rolland-Consten in the 12 Hours of Sebring; Bianchi-Rolland in the Targa Florio; and Adamich-"Geki" in the 1000 km of Nürburgring, the 6 Hours of Melbourne, the Giro d'Italia and the Criterium des Cevennes. There were further class wins the following year: at Monza (De Adamich-Zeccoli), Sebring (Andrey-"Geki"), in the Targa Florio (Pinto-Todaro) and at the Nürburgring (Bianchi-Schultze).
The car weighs 850 kg (1,874 lb) thanks to its carbon fibre frame and hand beaten aluminium body panels and has a 420 hp (313 kW) dry sump 4.2 litre V8 engine. The car has a 6-speed sequential gearbox and can attain a top speed of over 300 km/h (186 mph). It can accelerate from zero to 100 km/h (62 mph) in 3.5 seconds.
The chassis is a carbon-fiber monocoque with some tubular elements. The suspension setup, front and rear, are double wishbones, with pushrod actuated coil springs, and dampers from Ohlins.
The Alfa Romeo TZ3 Stradale is the road version of the TZ3 (hence the name TZ3 Stradale, stradale meaning road in Italian), designed by Norihiko Harada of Zagato, and was built to celebrate 100 years of Alfa Romeo on the road. The TZ3's chassis is based on the Dodge Viper ACR-X, and has been re-bodied to suit road conditions. Only nine units of the vehicle have been made.
The TZ3 is powered by the ACR-X's odd-firing 8.4-liter Viper all-aluminum 90° OHV 2-valve V10, but its power has been reduced to 600 horsepower (450 kW; 610 PS) at 6,100 rpm, and 560 pound-feet (760 N⋅m) of torque at 5,000 rpm. Redline is reached at 6,250 rpm. All of this power is delivered to the rear wheels, via a 6-speed Tremec TR6060 manual transmission.
The interior design is mainly the same as a regular Viper, but has Alfa Romeo badging.
The body and the frame come from the ACR-X, which are manufactured with SMC & rim panels over a tubular space frame.
The brake discs, which are 2-piece, come from StopTech, and the calipers are from Brembo.
The steering wheel is rack-and-pinion, with power assist.
The suspension setup for front and rear are A-arms, with coil-over shocks and stabilizer bars.