Mercedes-Benz R107 and C107

Mercedes-Benz R107 and C107

The Mercedes-Benz R107 and C107 automobiles were produced from 1971 through 1989 and were described by many as one of the best looking cars Mercedes-Benz produced to date,^[2] being the second longest single series ever produced by the Mercedes-benz automaker, after the G-Class. They were sold under the SL (R107) and SLC (C107) model names. The R107 replaced the W113 SL-Class in 1972 and was replaced by the R129  SL-Class in 1989. The SLC replaced the W111 Coupé in 1971 and was replaced by the C126  S-class coupe in 1981.

 

 

 

Model history

The R107 took the chassis components of the mid size Mercedes-Benz W114 model and mated them to the larger engines from the S-Class (W116).
The SL variant was a 2-seat convertible/roadster with standard soft top and hardtop and optional folding seats for the rear bench. The SLC (C107) derivative was a 2 door hardtop coupe with normal rear seats. The SLC is commonly referred to as an 'SL coupe', but in reality it was an S-class coupe, replacing the former saloon-based 280/300 SE coupé in Mercedes lineup. The SLC was replaced earlier than the SL, in 1981, with a much larger model, the 380 SEC based on the new S class.
Volume production of the first R107 car, the 350 SL, started in April, 1971 alongside the last of the W113 cars; the 350 SLC followed in October. Sales in North America began in 1972, and cars wore the name 350 SL, but had a larger 4.5L V8 (and were renamed 450 SL/SLC for model year 1973); the big V8 became available on other markets with the official introduction of the 450 SL/SLC on non-North American markets in March, 1973. US cars sold from 1972 through 1975 used the Bosch D Jetronic fuel injection system, an early electronic engine management system.
From July, 1974 both SL and SLC could also be ordered with a fuel-injected 2.8L straight-6 as 280 SL and SLC. US models sold from 1976 through 1979 used the Bosch K Jetronic system, an entirely mechanical fuel injection system. All US models used the 4.5 liter engine, and were called 450 SL/SLC.
In September, 1977 the 450 SLC 5.0 joined the line. This was a special version of the big coupé featuring a new all-aluminum five-liter V8, aluminum alloy doors, hood and trunk lid - and a black rubber rear spoiler.

In September, 1977 the 450 SLC 5.0 joined the line. This was a special version of the big coupé featuring a new all-aluminum five-liter V8, aluminum alloy doors, hood and trunk lid - and a black rubber rear spoiler.

 

Mercedes-Benz 450 SLC 5.0 - note longer wheelbase and different rear pillar

Starting in 1980, US cars were equipped with lambda control, which varied the air/fuel mixture based on feedback from an oxygen sensor. The 350, 450 and 450 SLC 5.0 models (like the 350 and 450 SL) were discontinued in 1980 with the introduction of the 380 and 500 SLC in March, 1980. At the same time, the cars received a very mild makeover; the 3-speed automatic was replaced by a four-speed unit, the 280 models came with a standard 5-speed (formerly a 4-speed) manual and all five-liter cars gained a black rear spoiler lip. The 280, 380 and 500 SLC were discontinued in 1981 with the introduction of the 126 series 380 and 500 SEC coupes. A total of 62,888 SLCs had been manufactured over a ten-year period of which just 1,636 were the 450 SLC-5.0 and 1,133 were the 500 SLC. Both these models are sought by collectors today. With the exception of the SL65 AMG Black Series, the SLC remains the only fixed roof Mercedes-Benz coupe based on a roadster rather than a sedan.
Following the discontinuation of the SLC in September, 1981, the 107 series continued initially as the 280, 380 and 500 SL. At this time, the V8 engines were re-tuned for greater efficiency, lost a few hp and consumed less fuel, helped by substantially numerically shorter axle ratios (that went from 3.27:1 to 2.47:1 for the 380 SL and from 2.72:1 to 2.27:1 for the 500 SL). From September, 1985 the 280 SL was replaced by a new 300 SL, and the 380 SL by a 420 SL; the 500 SL continued and a 560 SL was introduced for certain extra-European markets, most notably the USA. Also in 1985, the Bosch KE Jetronic was fitted. The KE Jetronic system varied from the earlier, all mechanical system by the introduction of a more modern engine management "computer", which controlled idle speed, fuel rate, and air/fuel mixture. The final car of the 18 years running 107 series - 500 SL painted Astral Silver was built on August 4, 1989 and it currently resides in the Mercedes-Benz museum in Stuttgart, Germany.
North American models

Sales of the SL and SLC models begun in the US one year later than in Europe.
The R107/C107 since introduction on North American market sported quad headlights, and from 1974 front and rear bumpers had added 8 inches (203 mm) of rubber on each end to comply with the U.S. National Highway Traffic Safety Administration regulations.
When the first 350s were exported to the US, because of the strict horsepower robbing emission requirements, the US 350s were shipped with low compression 4.5 liter engines.
The 450 SL was produced until 1980. Model years 75 and 76 450 SLs suffered from vapor lock and hard restart because of the under-hood position of the catalytic converter. Starting in MY 77, the catalytic converter was moved to replace the resonator, located just behind the transmission in the exhaust system.
Next was the 380 SL imported from 1981 to 1985. The 380 SL was the least powerful of the US imported R107 roadsters. This engine came with a single row timing chain from 1981 through 1983. MYs 1984 and 1985 came with a double row timing chain from the factory. These early 380 models were plagued with chain failure problems and the problem was corrected by Mercedes-Benz, free of charge. Some models, however, escaped retrofit and may at some point fail as a result.
Another problem area for late 450 SLs and early 380 SLs was the automatic climate control system. Based on a "servo", which controlled coolant flow to the heater core, as well as vacuum to actuate the vents in the interior of the car, the system proved unreliable. It was installed on 450 SLs from 1978 through end of production in 1980, and continued on the 1981 MY of the 380 SL. Models produced prior to 1978 had a manual climate control system, models produced after 1981 received a more reliable automatic climate control system.
The more powerful 500 SL with 5.0 liter engine, produced from 1980–1989, was not available in the US through Mercedes-Benz and was popular in "gray market" import before the arrival of the 560 SL (only made for the USA, Japanese and Australian market) in 1986-1989.
Despite the larger 5.6 liter engine of the 560 SL, the 500 SL is recorded as being the fastest production 107 produced (mostly because of the lack of emission restraints) The 500 SL was published by Mercedes-Benz as having 0-60 mph times of 7.4 seconds for a top speed of 225 km/h (140 mph). Torque for the 500 SL is 296 lb·ft (401 N·m) at 3200 rpm and for the 560 SL 287 lb·ft (389 N·m) at 3500 rpm.

 

Mercedes-Benz W113

Mercedes-Benz W113

The Mercedes-Benz W 113 is a two-seat roadster/coupé, introduced at the 1963 Geneva Moto Show, and produced from 1963 through 1971. It replaced both the legendary 300 SL (W 198) and the 190 SL (W 121 BII). Of the 48,912 W 113 SLs produced, 19,440 were sold in the US.
The W 113 SL was developed under the auspices of Mercedes-Benz Technical Director Fritz Nallinger, Chief Engineer Rudolf Uhlenhaut and Head of Styling Friedrich Geiger. The lead designers were Paul Bracq and Béla Barényi, who devised its distinctive, patented, slightly concave hardtop, which inspired the "Pagoda" nickname.
All models were equipped with an inline-six cylinder engine with multi-port fuel injection. The bonnet, trunk lid, door skins and tonneau cover were made of aluminum to reduce weight. The comparatively short and wide chassis, combined with an excellent suspension, powerful brakes and radial tires gave the W 113 superb handling for its time. The styling of the front, with its characteristic upright "fishbowl" headlights and simple chrome grille, dominated by the large three-pointed star in the nose panel, paid homage to the then already legendary 300 SL roadster.
W 113 SLs were typically configured as a "Coupe/Roadster" with a soft-top and an optional removable hardtop. A 2+2 was introduced with the 250 SL "California Coupe," which had a fold-down rear bench seat instead of the soft-top.

History

By 1955, Mercedes-Benz Technical Director Prof. Fritz Nallinger and his team held no illusions regarding the 190 SL's lack of performance, while the high price tag of the legendary 300 SL supercar kept it elusive for all but the most affluent buyers. Thus Mercedes-Benz started evolving the 190 SL on a new platform, model code W 127, with a fuel-injected 2.2 liter M180 inline-six engine, internally denoted as 220 SL. Encouraged by positive test results, Nallinger proposed that the 220 SL be placed in the Mercedes-Benz program, with production commencing in July 1957.
However, while technical difficulties kept postponing the production start of the W 127, the emerging new S-Class W 112 platform introduced novel body manufacturing technology altogether. So in 1960, Nallinger eventually proposed to develop a completely new 220 SL design, based on the "fintail" W 111 sedan platform with its chassis shortened by 30 cm (11.8 in), and technology from the W 112. This led to the W 113 platform, with an improved fuel-injected 2.3 liter M127 inline-six engine and the distinctive "pagoda" hardtop roof, designated as 230 SL.
The 230 SL made its remarkable debut at the prestigious Geneva Motor Show in March 1963, where Nallinger introduced it as follows: "It was our aim to create a very safe and fast sports car with high performance, which despite its sports characteristics, provides a very high degree of traveling comfort

Legacy

The W 113 was the first sports car with a "safety body," based on Bela Barényi's extensive work on vehicle safety: It had a rigid passenger cell and designated crumple zones with impact-absorbing front and rear sections built into the vehicle structure. The interior was "rounded," with all hard corners and edges removed, as in the W 111 sedan.
The W 113 was also the first Mercedes-Benz with radial tires.

Models

230 SL (1963–1967)

230 SL (1963–1967) [edit]

Mercedes-Benz 230 SL, US model

Production of the 230 SL commenced in June 1963 and ended on 5 January 1967. Its chassis was based on the W 111 sedan platform, with a reduced wheelbase by 30 cm (11.8 in), recirculating ball steering (with optional power steering), double wishbone front suspension  and an independent single-joint, low-pivot swing rear-axle with transverse compensator spring. The dual-circuit brake system had front disc brakes and power-assisted rear drum brakes. The 230 SL was offered with a 4-speed manual transmission, or an optional, very responsive fluid coupled (no torque converter) 4-speed automatic transmission, which was popular for US models. From May 1966, the ZF S5-20 5-speed manual transmission was available as an additional option, which was particularly popular in Italy. Of the 19,831 230 SLs produced, less than a quarter were sold in the US.
The 2,308 cc (2.3 L) M127.II inline-six engine with 150 PS (110 kW; 150 hp) and 196 N·m (145 lb·ft) torque was based on Mercedes-Benz' venerable M180 inline-six with four main bearings and mechanical Bosch multi-port fuel injection. Mercedes-Benz made a number of modifications to boost its power, including increasing displacement from 2,197 cc (2.2 L), and using a completely new cylinder head with a higher compression ratio (9.3 vs. 8.7), enlarged valves and a modified camshaft. A fuel injection pump with six plungers instead of two was fitted, which allowed placing the nozzles in the cylinder head and "shooting" the fuel through the intake manifold and open valves directly into the combustion chambers. An optional oil-water heat exchanger was also available.
Mercedes-Benz Chief Engineer Rudolf Uhlenhaut, who was as competent behind the wheel as any racing driver, demonstrated the capabilities of the 230 SL on the tight three-quarter mile Annemasse Vétraz-Monthoux race track in 1963, where he put up a best lap time of 47.5 seconds vs. 47.3 seconds by Grand Prix driver Mike Parkes on his 3 liter V12 Ferrari 250 GT.
A brief chronology of the most notable changes made to the 230 SL:

• 10/1963: First 230 SL with automatic transmission.
• 09/1964: Spare tire well removed, tire mounted horizontally.
• 11/1964: Optional tinted/thermal glass and new soft-top with steel bows (distinguished by missing chrome trim on the outer trailing edge).
• 04/1964: US models with radio Becker Europa TR instead of Europa TG.
• 08/1965: Some harmonization with new W 108/W 109 sedans, incl. new floor panels, combined brake and clutch fluid reservoir, trunk light and interior changes. US models with hazard lights.
• 03/1966: Mounts for three-point seat belts added.
• 05/1966: Optional ZF 5-speed manual transmission; rare and now very desirable

250 SL (1966–1968)

The 250 SL was introduced at the 1967 Geneva Motor Show.Production had already commenced in December 1966 and ended in January 1968. The short one-year production run makes the 250 SL the rarest of the W 113 series cars. The 250 SL retained the stiffer suspension and sportier feel of the early SLs, but provided improved agility with a new engine and rear disc brakes. Range also improved with increased fuel tank capacity from 65 L (17.2 US gal) to 82 L (21.7 US gal). Like its predecessor, the 250 SL was offered with a 4-speed automatic transmission, and 4-speed or ZF 5-speed manual transmissions.For the first time, an optional limited slip differential was also available. Of the 5,196 250 SLs produced, more than a third were sold in the US.

The main change was the use of the 2,496 cc (2.5 L) M129.II engine with 6 mm (0.2 in) increased stroke, 2 mm (0.1 in) increased valve ports, and seven main bearings instead of four. The nominal maximum power remained unchanged at 150 PS (110 kW; 150 hp), but torque improved from 145 lb·ft (197 N·m) to 159 lb·ft (216 N·m). Resiliency also improved with a new cooling water tank ("round top") with increased capacity from 10.8 L (2.9 US gal) to 12.9 L (3.4 US gal), and a standard oil-water heat exchanger.
The wider power band of the 250 SL resulted in noticeably improved performance, as the 230 SL engines rarely produced more than 143 PS (105 kW; 141 hp) in practice.

California Coupé
The 250 SL also marked the introduction of a 2+2 body style, the so-called "California Coupé", which had only the removable hardtop and no soft-top: a small fold-down rear bench seat replaced the soft-top well between passenger compartment and trunk. The lacking soft-top relegated open California Coupés to a formidable nice weather ride, so many of them are very well preserved today. Retrofitting the soft-top above the rear bench seat requires considerable effort and expense, however. Thus while these 2+2 models are rare, their somewhat limited usability makes them not particularly sought after today.

Midlife improvements

In August 1967, a number of additional changes were incorporated to accommodate stricter safety regulations and US emission laws. The safety improvements included a collapsible steering wheel and padded wheel hub, concave control knobs, elastic black rubber heater levers (instead of rigid colored translucent plastic), and softer, rounded dash top padding. Door handles, locks, and window cranks were modernized and less protruding, the door pockets were elastic, the rear-view mirror frame was chrome instead of black plastic, and the side view mirrors became more angular. Essentially, the 1967 250 SL retained the more classic "chrome" interior of the 230 SL, whereas the 1968 250 SL introduced the modernized "safety" interior of the 280 SL.
US models acquired side reflectors on the fenders, Kangol three-point seat belts, an illuminated gearbox for the automatic, and emission control equipment. The chrome horn ring was changed to matte finish.

280 SL (1967–1971)

The 280 SL was introduced in December 1967 and continued in production through 23 February 1971, when the W 113 was replaced by its successor, the entirely new and substantially heavier R107 350 SL. Over the years, the W 113 evolved from a sports car  into a comfortable grand tourer, and US models were by then usually equipped with the 4-speed automatic transmission and air conditioning. Manual transmission models came with the standard 4-speed or the optional ZF 5-speed, which was ordered only 882 times and thus is a highly sought-after original option today. In Europe, manual transmissions without air conditioning were still the predominant choice. Of the 23,885 280 SLs produced, more than half were sold in the US.
The main change was an upgrade to the 2,778 cc (2.8 L) M130 engine with 170 PS (130 kW; 170 hp) maximum power and 180 lb·ft (244 N·m) maximum torque, which finally gave the W 113 adequate power. The performance improvement was achieved by increasing bore by 4.5 mm (0.2 in), which stretched the limits of the M180 block, and required pairwise cylinder casts without cooling water passages. This mandated an oil-cooler, which was fitted vertically next to the radiator. Each engine was now bench-tested for two hours prior to being fitted, so their power specification was guaranteed at last.
The M130 marked the final evolution of Mercedes-Benz' venerable SOHC M180 inline-six, before it was superseded by the entirely new DOHC  M110 inline-six introduced with R107 1974 European 280 SL models. For some time, it was also used in the W 109 300 S-Class, where it retired the expensive 3 liter M189 alloy inline-six.
A brief chronology of the most notable changes made to the 280SL:

• 12/1967: One piece wheel-covers (like W 108/W 109 sedans).
• 10/1968: US models with sealed beam headlights without fog lights.
• 02/1969: New tail lights with amber turn signals.
• 05/1969: ZF 5-speed manual transmission discontinued as listed option and available only on special request.
• 07/1969: US models with headlight assembly with full amber lower section, illuminated side markers, transistorized ignition, and improved emission control.
• 08/1969: Heated rear window for hardtop, hazard lights for all models, single master key for all locks.
• 04/1970: Bosch Lichteinheit headlights optionally with halogen main beam (distinguished by "flat" instead of "bubble" lens).
• 08/1970: Fuchs alloy wheels available as a factory-fitted option.
• 11/1970: Opaque beige plastic coolant expansion tank (instead of satin-black steel). New door locks: cylinder can be depressed while door is locked.

North American models

North American models have a number of subtle differences, the most obvious one being the distinctive "sealed beam" bulb headlights required in the US versus the Bosch Lichteinheit headlights for the rest of the world.1970 US models also acquired amber turn-signal lenses on the rear lights, later than most other countries.
Other differences of the North American models include imperial gauges, chrome bumper guards, side reflectors (illuminated from 1970), lower rear-axle ratios for faster acceleration yet lower top speeds, and no "single-side" parking lights. US market 280 SL engines required emission control modifications, including "softer" valve timings, a reduced compression ratio and a modified injection pump, which reduced power from 170 PS (130 kW; 170 hp) to 160 PS (120 kW; 160 hp).^[7] In the US, automatic transmission, air conditioning, and white wall tires were much more popular than elsewhere.
European cars were popular as US gray-market imports: those vehicles were brought to the US some years after their original delivery in Europe. Early European imports had aftermarket hazard lights and Kangol seat belts fitted, US safety requirements that were adopted in Europe only in later production years.

   

Mercedes-Benz SL-Class

Mercedes-Benz SL-Class

The Mercedes-Benz SL is a grand torer manufactured by Mercedes since 1954. The designation SL derives from the German Sport Leicht, or Sport Lightweight — and was first applied to the 300SL'Gullwing' named also after its gullwing or upward-opening doors.
The term SL-Class refers to the marketing variations of the vehicle, including the numerous engine configurations spanning six design generations.

1954 to 1963

The 300SL roadster succeeded the Gullwing in 1957. The 4-cylinder 190SL was more widely produced with 25,881 units, starting in 1955. Cars of the open SL-Class were available as a coupe with a removable hardtop or as a roadster with convertible soft top or with both tops. Production for the 190SL and 300SL ended in 1963.

• 300SL ("Gullwing"): 1954–1957, 3.0L I6, 215 hp (160 kW)
• 300SL (Roadster): 1957–1963 3.0L I6, 225 hp (168 kW)
• 190SL: 1955–1963, 1.9L I4, 105 hp (78 kW)

1963 to 1971

Next came the SL-Class 230SL, a new design with a 2.3L mechanically fuel injected six cylinder engine. It featured a low waistline and big curved greenhouse windows, and a Coupe Roadster with detachable hardtop, whose distinctive roofline earned the nickname "pagoda top." The design was by Paul Bracq. Around 1967, the engine received a displacement increase and the model became known as the 250SL. Within a year the engine displacement was increased for the final time and the model designation became 280SL. Beginning with later versions of the 250SL changes were made to dashboard padding, switches and knobs, door pockets (U.S. models only) and steering wheel. In addition, on the 230SL formerly separate center hub caps and wheel trim rings became full wheelcovers.

• 230SL: 1963–1967, 2.3L I6, 150 hp (112 kW)
• 250SL: 1966–1968, 2.5L I6, 150 hp (112 kW)
• 280SL: 1967–1971, 2.8L I6, 170 hp (127 kW)

1972 to 1989

350SL: 1971–1980, 3.5L V8

450SL: 1973–1980, 4.5L V8

280SL: 1974–1985, 2.8L I6

380SL: 1980–1986, 3.8L V8

500SL: 1980–1986, 5.0L V8

All updated 86-89 models have the advantages of the more modern 4 pot brakes, larger discs, and suspension derived from the W124 sedan. The body itself is built with a modern paint system designed to improve protection from rust. However this was not effective as models still continued to rust especially around the wheel arches, sills, jacking points, floor and front wings; especially the drill holes on which the mudflaps are mounted and the sides facing the engine bay.

• 300SL: 1986–1989

The 300SL base model was available as standard in a 5-speed manual although very few were sold. The SOHC 6 cylinder M103 is typically considered to have handling advantages with its lighter weight engine.

• 420SL: 1986–1989, 4.2L V8
• 500SL: 1986–1989, 5.0L V8
• 560SL: 1986–1989, 5.6L V8

The 560SL was only sold in the USA, Canada, Japan, and Australia to compensate the reduced output of the 5.0L due to the stricter emission laws in these markets.

1989 to 2002


The 1990 Mercedes SL base model was the 228 hp (170 kW) 3.0 L inline 6 300SL version in the US. In Europe the base model was the 190 hp (140 kW) 3.0 L inline 6 300SL with 12 valves, and the 228 hp (170 kW) 3.0 L inline 6 with 24 valves is known as the 300SL 24 . But it was the 322 hp (240 kW) 500SL (with a 5.0 L V8 engine) which made the most headlines. The specification was high, with electric windows, mirrors, seats and roof.
The R129 model was the first convertible/roadster to offer the automatic rollbar deployment in event of rollover. The motorist can also manually raise and lower the rollbar should he choose to. This facilitates the clean look of R129 without compromising the occupant's safety.
1994 saw a minor facelift for the SL with changes to the taillamps and white turn signal indicators in the front, and the 300SL was replaced in Europe by the SL280 and SL320 (with 2.8 L and 3.2 L I6 engines). The SL500 continued with the same powerful engine. A 389 hp (290 kW) 6.0 L V12 SL600 topped the range. Introduced in 1993 as the 600SL, it was re-badged the SL600 in 1994.
The SL320 replaced the 300SL in the United States in 1995, but the SL280 was not offered. The 6-cylinder SLs were dropped from the US lineup in 1998, leaving just the V8 and V12. The SL500 got a new 302 hp (225 kW) 5.0 L V8 for 1999.

AMG

The extremely rare SL73 AMG was sold through AMG in 1995, and at 525 bhp (391 kW) it offered the most powerful V12 engine ever put into an SL up to that time. After a brief gap, the SL73 was offered again from 1998 to 2001, although the engine was slightly updated to be more reliable. The same 7.3L V12 was later used by Pagani in the Zonda. A total of 85 SL73 AMG roadsters were built. The SL73 was briefly reintroduced in September 1999 following the SL's end-of-life facelift and a limited number were produced up until December 2001. The facelifted SL73 is the car that appears in the picture (left).
Even more rare is the SL70 AMG which was powered by a 7.0 L V12 engine.
The SL60 AMG was also extremely rare. Sold through MB from 1996 to 1998, it used a 6.0 litre V8 engine producing between 381 bhp (284 kW) and 384 bhp (286 kW). AMG claimed a 0-62 mph (100 km/h) speed of 5.8 seconds. Its top speed was limited to 155 mph (249 km/h), but with the limiter removed, it was capable of approximately 185 mph (298 km/h). AMG later unofficially admitted that 0-60 mph was closer to 5.0 seconds and the engine produced between 405-410 bhp.
The SL55 AMG was sold through AMG in the R129 bodystyle from 1998 to 2001 in limited quantity. It was the predecessor of the production R230 SL55 AMG sold from 2002 to 2008.
Only about 300 cars in the SL-class were customized by AMG prior to 2002.

2001 to 2008

The fifth generation SL was in production between 2002 and 2008. The all-new SL (initially just a 5.0 L SL500 version) featured a retractable hardtop (marketed as the Vario Roof) available on the SLK since 1997. This featured a 5.0 L 302 hp (225 kW) V8, with a 5.4 L AMG Supercharged V8 appearing in 2002's SL55 AMG. V12 engines are available in the SL600 and the limited-production SL65 AMG and the SL350 3.7 L (3724 cc) 18-valve V6 245 hp in some markets.

2008 to 2012

The R230 SL underwent a significant facelift in 2008 featuring new and revised engines and a new front end that evokes the classic 300SL with a large grille featuring a prominent 3-pointed star and twin "power domes" on the hood, the car also features new headlights with an optional "Intelligent Light System" and a new speed sensitive steering system. The SL 63 AMG replaced the SL 55 AMG.

2012 to present

In December 2011, Mercedes-Benz announced the all new SL-Class and was formally launched at the North American International Auto Show in January 2012. The new SL (R231) has been produced for the first time almost entirely from aluminium. The new aluminium bodyshell weighs around 110 kilograms less than it would using the steel technology from the predecessor. Although the Mercedes-Benz SL-Class has more assistance systems on-board than its predecessor and therefore does actually sacrifice some of the weight saved through the aluminium bodyshell, the scales show some better figures: the SL 500 (1.785 kg) weighs around 125 kilograms less and the SL 350 (1.685 kg) is 140 kilograms lighter than its predecessor.
New features include the unique FrontBass system (it uses the free spaces in the aluminium structures in front of the footwell as resonance spaces for the bass loudspeakers) and adaptive windscreen wipe/wash system MAGIC VISION CONTROL, which supplies water from the wiper blade as required and depending on the direction of wipe. The R231 is also available with two different suspension systems: semi-active adjustable damping as standard. The optional active suspension system ABC (Active Body Control) is available as an alternative. Both suspension variants are combined with a new electromechanical Direct-Steer system featuring speed-sensitive power steering and a ratio that can be varied across the steering wheel angle and it also reduces the amount of steering required when parking and manoeuvring.
Contrasted with its predecessor, the new generation of the SL is longer and wider. Shoulder room is increased by 37 mm (1.5 in)) and elbow room 28 mm (1.1 in).