Background
Outwardly, the SLK32 appears to be a standard SLK230 or 320. There are a number of subtle clues, but confirmation arrives as soon as the supercharged six comes to life. The first time you stab the load pedal, 332-pound feet of torque will shove you back into the seat. Just about the time the torque lets up, you’ll look down at the speedo and recognise that 349 bhp makes the world go by a lot faster.
Some may glance at the spec sheet and think this has to be an exaggeration. After all, the SLK320 has a 3.2 litre six as well. The big difference is the compressor. Although AMG starts with the same basic 2.3 litre vee six, that’s just the starting point. The hand-built Kompressor engine retains the SOHC, three-valve per cylinder design, but in addition to the supercharger the AMG engine gets a new crankshaft, rods, pistons, cams, valve springs, oil pump, exhaust system and engine computer.
The supercharger is a unique piece of work. It uses Teflon coated helical rotors to produce 14.5 psi of boost. To improve fuel economy and lower emissions, the supercharger is fitted with a computer controlled electromagnetic coupling device that disengages under low load conditions. It disengages and engages so smoothly that many people can’t tell when the engine is generating boost.
The supercharger is aided by a liquid to air intercooler that sits in the vee between the cylinder banks. The liquid intercooler is fed by a front mounted radiator. This all helps lower intake temperatures resulting in more power. The difference in power is impressive. Torque is increased a little more than 50%, while horsepower is raised over 60% (from 221-pound feet of torque to 332, and 215 bhp to 349). The results are zero to sixty in the sub five second range.
All SLK32’s use an electronically controlled, driver adaptive 5-speed automatic. The 5-speed automatic has TouchShift, which allows the driver to manually select gears without having to manage a clutch. These transmissions also have an intelligent automatic mode. The transmission computer uses road speed changes, load, and throttle position in determining when to shift. The transmission computer also recognises uphill and downhill grades. The transmission avoids annoying shifts back and forth between gears on long inclines and delays upshifts on descents. Delaying the upshift allows for engine braking exactly as a driver would with a manual transmission. These transmissions are also equipped with SpeedShift. SpeedShift transmissions shift 35 percent faster than normal and have much stronger internals than the standard SLK automatic.
Being a Mercedes Benz, the improvements didn’t stop with the drive train. The wheels and tyres, suspension, and brakes are all upgraded as well. The suspension features AMG springs that are stiffer and shorter resulting in a 25mm lower ride height. The more aggressive springs are complimented with AMG spec dampers and thicker roll-bars. The wheels are AMG twin-spoke aluminium alloys. The front wheels are 17x7.5, while the rears are 17x8.5. the front tyres are 225/45 ZR17. The rears are 245/40 ZR17. The brake discs are internally ventilated and 330mm in diameter up front, 300mm in diameter in the back.
The bodywork has subtle styling changes. The SLK32 has an AMG specific front bumper, side skirts, rear bumper and a rear boot lid spoiler. A few well-placed badges round out the body. The interior is graced with contoured sports seats in leather and an AMG specific instrument cluster.







