In September 1995 for the 1996 model year, Varioram was added to the Carreraís engine after it was first used on the RS that was launched earlier in í95. Along with larger intake and exhaust valves, Varioram upped power to 285bhp and swelled torque to 251lb ft at a slightly lower 5250rpm. Varioram works by altering the length of the inlet pipes depending on engine speed. Below 5000rpm, the inlet pipes of a Varioram-equipped car are about twice the length of an earlier 993 modelís. Above 5000rpm, they shorten by means of a vacuum-operated sleeve. A Varioram-equipped 993 is easy to spot by opening the engine lid and looking for the large aluminium pipes sat on top of the engine. In non-Varioram 993s, thereís a much smaller black-painted system of pipes.
When looking in the engine, itís also worth checking out the air conditioning pump is on good order. Sat just to the right of the distinctive fan, the pumpís belt should be in good condition and taut.
While checking the engine, look at the heat exchangers as they can rust and are expensive to replace. Plenty of 993 owners will have replaced the original exhaust with a sports item, but make sure it will pass an emissions test for the MoT.
The Turbo and GT2 use the same basic engine as the Carrera models but with twin KKK K16 turbochargers and Bosch Motronic 5.2 engine management. The compression ratio increased from the 964 Turboís 7.5:1 to 8.1 and the Turbo could now run on regular 95-octane petrol rather than just 98-octane fuel. The GT2 upped power further to 450bhp for the race cars, while roadgoing GT2 came with 430bhp. A handful of road legal GT2 Evos were made with 450bhp engines, giving a top speed of 189mph and 0-60mph in 4.4 seconds. The Turbo was good for 0-60mph 4.5 seconds and 180mph. Only the RS model used the larger 3.8-litre capacity flat-six engine, packing 300bhp.
All rear-wheel drive 993 models used the six-speed manual G50 gearbox as standard, while the Tiptronic was an A50 unit. The Turbo came with a six-speed G64 gearbox.
Porsche 993 - Introduction
Porsche 993 - Powertrain (viewing now)
Porsche 993 - Rolling Chassis
Porsche 993 - Body
Porsche 993 - Interior
Porsche 993 - General Experiences
Porsche 993 - Search the PH Classifieds
Porsche 993 - Insurance (Sponsored link)