gearheads and monkeywrenches

beautifullyengineered:

The Mercedes-Benz 190E Evolution II is Beautifully Engineered

Your E30 M3 has an inferior rear suspension.

To keep competitive in the Group A Touring Car Championship, Mercedes unveiled the 2.5-16 Evolution II at the 1990 Geneva Motor Show. The most radical departure from the standard 190 was its body kit which included an outrageous rear wing, probably the largest ever fitted to a Mercedes four door.

At the time, Group A homologation dictated that the aerodynamic devices of the race car were limited to those on production version. So the Evolution II retained the full competition bodywork including its unusually tall rear wing that was necessary as the regulations didn’t allow the wing to impede rearward vision. So, the clever engineers put a cover over the top of the rear windscreen so that the tall wing couldn’t be seen.

While the larger wheel flares and front dam did their best to match the rear wing, the interior of the 190E was all business. Opulent wood finishes and leather seats did little to remind the driver that this was competition-derived special. Curiously, a special knob was provided to offer three different ride heights.

Under the hood, nothing was substantially altered from the standard 190 2.5-16, however Mercedes-Benz changed the compression ratio, valve lift, timing, intake tract and exhaust to help the car reach 232 bhp compared to the normal 195.

The chassis was correspondingly upgraded with larger brakes, a harder suspension, 17 inch wheels and the hydro-pneumatic adjustable ride height was left intact.

Over 502 cars were built, and all in a blue-black metallic paint scheme. The changes made to these cars were good enough for Klaus Ludwig to clinch the DTM driver’s title in 1992.

Drivetrain:

• engine M102 E 25/2 Inline-4
• position Front Longitudinal
• valvetrain DOHC, 4 Valves per Cylinder
• fuel feed Bosch Mechanical Injection
• displacement 2463 cc / 150.3 in³
• bore 97.3 mm / 3.83 in
• stroke 82.8 mm / 3.26 in
• compression 9.7:1
• power 173.0 kw / 232 bhp @ 7200 rpm
• specific output 94.19 bhp per litre
• bhp/weight 164.77 bhp per tonne
• torque 245.4 nm / 181 ft lbs @ 5000 rpm
• redline 7700
• transmission 5-Speed Manual
• gear ratios 3.25:1, 1.90:1, 1.32:1, 0.98:1, 0.71:1
• final drive 3.85:1

Chassis/Suspension

• body / frame Unit Steel
• driven wheels RWD
• front tires 245/40ZR-17 Dunlop SP Sport D40
• rear tires 245/40ZR-17 Dunlop SP Sport D40
• front brakes Vented Discs w/Power Assist, ABS
• rear brakes Vented Discs w/Power Assist, ABS
• front wheels F 43.2 x 21.0 cm / 17 x 8.25 in
• rear wheels R 43.2 x 21.0 cm / 17 x 8.25 in
• steering Recirculating Ball w/Power Assist
• f suspension MacPherson Struts w/Coil Springs, Tube Shocks, Anti-Roll Bar
• r suspension 5-Link w/Coil Springs, Tube Shocks, Anti-Roll Bar
• weight 1408 kg / 3105 lbs

Performance:

• top speed ~249.4 kph / 155 mph
• 0 - 60 mph ~7.0 seconds
• 0 - 1/4 mile ~15.5 seconds