Supra Mkiv
Supra Mkiv
With the fourth generation of the Supra, Toyota took a big leap in the direction of a more powerful sports car. The new Supra was completely redesigned, with rounded body styling partly based on the Ferrari F40 and featured two new engines: naturally aspirated 2JZ-GE 220 hp (164 kW) and 210 ft-lbf (285 Nm) of torque and a twin turbocharged 2JZ-GTE making 276 bhp (239 kW), 260 ft-lbf (427 Nm) of torque. The Turbo was actually quoted to have 320 bhp, as the cars in the Japan market can only declare up to 276. The turbocharged variant could achieve 0–60 mph in as low as 5.1 seconds and 1/4 mile (402 m) in 13.3 seconds at 108 mph. The engine is capable of producing around 500hp with the stock twin turbos and mild bolt-on upgrades such as a boost controller and high-flow exhaust. The turbo version was tested to reach over 289 kph (180 mph) all-stock, but the cars are restricted to just 180 kph in Japan and 250 elsewhere. European versions also had a hood scoop.
The MKIV Supra’s twin turbos operated in sequential mode instead of the more common parallel mode. The sequential setup featured a pair of small, equally sized turbos, with ceramic blades for the domestic Japanese market and steel blades for export (USA, Europe) markets. At first, all of the exhaust is routed to the first turbine for reduced lag. This resulted in boost and enhanced torque as early as 1800 rpm. Approaching 4000 rpm, the exhaust is routed to the second turbine for a “pre-boost” mode, although none of the compressor output is used by the engine at this point. Approaching 4500 rpm, the second turbo’s output is added to the intake air, and both turbos operate in parallel. Most cars which are advertised as “twin turbo” operate by having the two equally sized turbos constantly running in parallel; the turbos spool up at the same time. The sequential mode provides greater low-end response at the expense of increased complexity and cost.
Article Source: Toyotamkivsupra.blogspot.com
