Despite being a sales success, the 924 was criticised from the day it was launched for being underpowered. The obvious solution for Porsche, following the success of the 911 Turbo was to come up with a turbocharged version of its entry-level car. This had the internal model number 931 (left-hand-drive) or 932 (right-hand-drive).
The engine was modified and fitted with a KKK K26 turbocharger and an external oil cooler. This gave a respectable output of 170bhp, which went through a racing-style dogleg gearbox.
Brakes were uprated, too, with larger discs at the front, and rear discs in place of the standard car’s drums.
Externally, the Turbo was treated to air vents in the nose, a NACA bonnet duct, a polyurethane rear spoiler, while two-tone paint was a popular option. Wheels were new five-stud, multispoke items.
Note that, although the 924 Turbo went off sale in 1982, it continued to be sold in Italy until 1984, where it offered a tax advantage over the larger-engined 944.
A total of 13,616 cars were built; 5568 for Rest of World, 6795 for USA and 943 for Japan.
Engine: Front-mounted, water-cooled straight-four
Compression ratio: 7.5:1
Maximum power: 125bhp at 5800rpm
Maximum torque: 245Nm at 3500rpm
Brakes: Front: 282mm discs; rear: 289mm discs
Suspension: Front: MacPherson struts with telescopic dampers and coil springs; rear: trailing wishbones with telescopic dampers and transverse torsion bar. Optional front and rear antiroll bars
Wheels & tyres: Front: 15x6J with 185HR70/15 tyres. Rear: 15x6J with 185HR70/15 tyres
0-62mph: 7.8 sec
Top speed: 140mph