E12 M535i
Production Versions:
4701: European-spec (LHD), 4/80-5/81
4702: European-spec (RHD), 7/80-6/81
4708: South African-spec (RHD), 2/81-7/81
4709: South-African-spec (RHD), 9/81-5/84
History
What makes the E12 M535i unique?
The E12 M535i is the only official BMW Motorsport-developed version of the E12 5 Series. It is the only E12 model powered by the 3.5-liter M30 inline-six from the E23 735i and E24 635CSi. It also has a BMW Motorsport-tuned chassis and several unique cosmetic items.
Where was the E12 M535i produced?
European-spec E12 M535i models were partially assembled on the normal 5 Series production line at Dingolfing then hand-finished at the BMW Motorsport facility on the Preussenstrasse in Munich. South African-spec versions were assembled in BMW's Rosslyn, South Africa factory from Complete Knock Down (CKD) kits supplied from Germany.
When was the E12 M535i introduced?
The E12 M535i was introduced at the 1979 Frankfurt motor show.
Why was the E12 M535i never officially sold in North America?
The E12 M535i was never officially sold in North America because the 3.5-liter M30 engine was not yet available with a catalyst and therefore could not meet U.S. emission control standards. Also, the addition of such equipment, as well as the various government-mandated safety items, would have reduced performance to essentially that of a North American-spec 528i.
Production Data
How many versions of the E12 M535i were developed?
Two versions of the E12 M535i were produced by BMW Motorsport GmbH exclusively for the European market, one in left-hand drive and another in right-hand drive. In addition, BMW of South Africa assembled its own right-hand drive version of the E12 M535i from German-supplied Complete Knock Down (CKD) kits. An updated M535i also existed as part of the "hybrid" E12/E28 range that was produced exclusively in South Africa between 1981 and 1984.
How many of each version were produced?
ECE (LHD): 950 built from 4/80 thru 5/81
ECE (RHD): 450 built from 7/80 thru 6/81
SA (RHD): 240 assembled from CKD kits from 2/81 thru 7/81
SA (RHD): 1,416 assembled from CKD kits from 9/81 thru 5/84*
*Special E12/E28 hybrid model. See Speical Versions.
Drivetrain
What kind of engine powers the E12 M535i?
The E12 M535i is powered by the early version of the M30 inline-six with a bore of 93.4mm and a stroke of 84.0mm for a total displacement of 3,453cc. This SOHC iron-block unit utilizes Bosch L-Jetronic fuel injection and produces 218 hp (DIN) at 5,200 rpm and 224 lb/ft of torque at 4,000 rpm. This engine was not offered with emission controls. Note: South African-spec models, though powered by essentially the same engine, are rated at 214 hp (DIN) and 229 lb/ft of torque.
What kind of gearboxes were available in the E12 M535i?
There were two different five-speed manual gearboxes fitted to the E12 M535i. All European-spec models were equipped with the Gertag close-ratio unit featuring a "dogleg" shift pattern and the following ratios: 3.72 (1), 2.40 (2), 1.77 (3), 1.26 (4), 1.00 (5). South African-spec model retained the more common overdrive Getrag transmission with the following ratios: 3.82 (1), 2.20 (2), 1.40 (3), 1.00 (4), .81 (5). All E12 M535i models were equipped with a 3.07:1 rear end with limited slip differential.
Chassis
How is the E12 M535i's suspension different from that of the standard E12 5 Series?
The basic suspension design of the E12 M535i is similar to that of all E12 5 Series models, with MacPherson struts in front and a semi-trailing arm design in the rear. However, it has been tuned by BMW Motorsport and is therefore equipped with unique springs and Bilstein shocks. Steering is by recirculating ball, with engine-speed-sensitive power assist and an overall ratio of 16.9:1.
What kind of brakes does the E12 M535i have?
Every E12 M535i has four-wheel disc brakes. The vented front rotors measure 11-inches (280mm) in diameter and are no larger than those fitted to other six-cylinder E12 models. However, at 25mm in thickness, they are 3mm thicker than all other E12 rotors. The solid rear rotors measure 10.7-inches (272mm) in diameter and are identical to those used on other E12 models. ABS was not available.
What are the factory wheel and tire sizes for the E12 M535i?
All E12 M535i models are fitted with 195/70VR14 tires but there were two different wheel options. All European-spec models are equipped with 6.5x14-inch BBS cross-spoke alloys while South African-spec versions use a slightly wider 7x14-inch version of a similar design made by BBS/Mahle. The latter also feature unique center caps bearing the BMW Motorsport logo.
Cosmetics
What distinguishes the exterior of the E12 M535i from that of a standard 5 Series?
The exterior of the E12 M535i can be identified by its unique body-color front airdam, black rubber rear spoiler and tri-color BMW Motorsport stripes on the side bodywork and front airdam. However, these items were technically listed as "special equipment" and could be omitted upon request in order to give the car the stealthy appearance of a standard 5 Series. In addition, the "M535i" grille and decklid badging could be deleted as well. However, the 14-inch cross-spoke alloy wheels were fitted to every M535i.
How is the exterior of the South African E12 M535i different from that of the German-built version?
The South African-spec M535i was not offered with the front airdam, rear spoiler or Motorsport stripes of the European-spec model. However, it was equipped with the "M535i" grille and decklid badging as well as a pair of large front foglights. It was also fitted with 7x14-inch BBS/Mahle cross-spoke alloy wheels featuring special center caps bearing the BMW Motorsport logo.
What distinguishes the interior of the E12 M535i from that of a standard 5 Series?
Though it shares its basic design and layout with that of the standard E12 5 Series, the interior of the E12 M535i contains two special features: Front sport seats made by Recaro in corduroy, leatherette or optional leather (or available ASS sport seats in black cloth with the Motorsport stripes) and a three-spoke leather-wrapped steering wheel featuring the BMW Motorpsort logo, identical to the one used in the M1 sports car.
How is the interior of the South African E12 M535i different from that of the German-built version?
The interior of the South African-spec E12 M535i is essentially identical to that of the German-built version, though it is fitted with additional standard equipment including air conditioning, power windows and central locking.
What features were optional on the E12 M535i?
The lengthy option list for the E12 M535i consisted of fog lights (not available with the front and rear spoilers), headlight washer/wipers, passenger-side rearview mirror, leather upholstery (or leatherette at no extra charge), ASS sport seats with Motorsport stripes, passenger seat height adjustment, velour floor mats, fire extinguisher, rear headrests, green tinted glass, brown tinted glass, air conditioning (including green-tinted glass), manual sunroof, power sunroof, power windows (all around or front only), central locking, various audio systems and a power antenna. In addition, the front airdam, rear spoiler and Motorsport stripes were listed as "special equipment," presumably at no extra charge. Note: Right-hand drive models (both ECE and South African) included many of these optional items as standard equipment.
Special Versions
Were there any special versions of the E12 M535i?
There were no official factory special editions of the E12 M535i. However, the M535i was not the first E12 model developed by BMW Motorsport GmbH. Through a special program offered soon after E12 production began, 5 Series sedans could be fitted by BMW Motorsport GmbH with the larger 3.0-liter and (later) 3.2-liter M30 inline-6 engines from the upmarket 6 Series and 7 Series models . Along with the "Motorsport Special Edition" E12 530 model, produced as a homologation special exclusively by BMW South Africa, these BMW Motorsport-built 5 Series were the unofficial predecessors to the E12 M535i. It is also worth noting that the M535i was included as part of the updated E12 range that was produced in South Africa prior to the introduction of the true E28 M535i in 1985.
What distinguishes the 3.0-liter and 3.2-liter E12 5 Series models built by BMW Motorsport?
Starting in 1974, the E12 5 Series could be equipped by BMW Motorsport GmbH with the three-liter M30 inline-six from the larger E3 sedans and E9 coupes in either carburetted or fuel-injected form. Later, the 3.2-liter version of the fuel-injected engine also became available. These cars were not separate models but were instead converted from standard 525, 528 or 528i sedans shipped from the normal BMW assembly line to the BMW Motorsport facility on the Preussenstrasse in Munich.
When fitted with these larger engines, the 5 Series sedans also received a shorter 3.45:1 rear axle ratio with limited slip differential, a revised exhaust system, Bilstein shocks, rear disc brakes, a reinforced rear axle and 195/70VR14 tires on 7x14-inch BBS cross-spoke alloy wheels with center caps bearing the BMW Motorpsort logo. Tri-color Motorsport stripes could be applied to the body as an option, and a BMW Motorsport three-spoke steering wheel and sport seats made by Recaro or Scheel were also available. It is thought that around 900 of these special E12 5 Series models were produced by BMW Motorsport over seven years.
What distinguishes the South African-built E12 530 Motorsport Special Edition?
The Motorsport Special Edition of the E12 530 was jointly developed by BMW of South Africa and BMW Motorsport GmbH in order to homologate the three-liter 5 Series sedan for competition in South Africa's Modified Production class. The production of at least 100 road cars was required under the homologation rules, though it is thought that around 200 street-legal examples of the Motorsport Special Edition 530 were ultimately produced, all in 1976.
At the time, the largest engine available in a standard production E12 5 Series was the 2.8-liter inline-six. However, the Motorsport Special Edition 530 was equipped with a larger three-liter motor based on the unit from the E3 sedan and E9 coupe but fitted with twin Zenith carburetors, a special camshaft, lightened flywheel and an engine oil cooler. It was rated at 197 hp (DIN) at 6,000 rpm and 204 lb/ft of torque at 4,300 rpm. This was mated to the close-ratio Getrag five-speed manual gearbox featuring a "dogleg" shift pattern and a Borg-Warner limited slip differential.
The chassis was upgraded with Bilstein shocks, stiffer springs and thicker anti-roll bars similar to those fitted to the German-built three-liter E12 5 Series models built by BMW Motorsport starting in 1974. In addition, the cars were equipped with four-wheel disc brakes and 195/70VR14 tires on BBS/Mahle cross-spoke alloy wheels.
All examples of the Motorsport Special Edition 530 were painted white with Motorsport stripes. The body featured fender lip extensions as well as fiberglass front and rear spoilers. In order to reduce weight, several body panels were made of aluminum or thinner steel, while the pedals and trunk hinges were drilled for further savings. Inside, these special 530s were fitted with Scheel sport seats covered in blue velour and equipped with a three-spoke sport steering wheel. Finally, the rear bench seat was mounted to a foam base in order to reduce weight even further.
What distinguishes the later South African-assembled E12/E28 "hybrid" M535i?
Though an E28-based successor to the original E12 M535i did not appear in German-built form until early 1985, an updated E12 M535i was introduced as part of the revised South African E12 5 Series range in the Fall of 1981. These special E12/E28 hybrid models mate the existing E12 bodywork with many of the improved chassis and interior features of the newer E28 (which were not produced in South Africa until 1985). Like the original E12 M535i, the updated model is powered by the older 3,453cc version of the M30 inline-six, rated at 214 hp (DIN) at 5,200 rpm and 229 lb/ft of torque at 4,000 rpm. This could be mated to either the overdrive or close-ratio version of the Getrag five-speed manual gearbox (as used on the German-built model), paired exclusively with the taller 3.07:1 final drive and limited slip differential. The M-Technic chassis is identical to that of the German-built E28 M535i, though the four-wheel disc brakes do not include ABS. Tires are metric-sized 200/60VR390 Michelin TRXs on 165mm x 390mm alloy wheels (also used on some non-M versions of the German-built E28 5 Series).
The early South African M535i shares all of its exterior body panels with the E12 5 Series and is not equipped with any special M-designed spoilers or trim. However, it is fitted with large front foglights, plus "M535i" grille and decklid badges, as seen on the E12 M535i.The interior blends the E28-style dashboard and instrument cluster with the E12-style door panels and seats, velour-covered Recaros in this case. It is also fitted with the early-style M steering wheel, as used in the E12 M535i and M1. The leather shift knob is also of the earlier E12 stlye, without the shift pattern on top. Standard equipment included air conditioning, power windows (front and rear), power mirrors, central locking, rear headrests, check control, and a radio/cassette audio system with four speakers. A power steel sunroof was optional.
BMW South Africa assembled 1,416 examples of the updated E12 M535i, known internally as model 4709, between September of 1981 and May of 1984. It was then replaced by a true E28-based successor to the E12 M535i in January of 1985.
Color and Upholstery Selections
Exterior Colors:
Alpine White (146), Henna Red (052), Black (086), Polaris Silver metallic (060), Arctic Blue metallic (045), Saphire Blue metallic (149), Reseda Green metallic (075), Cypress Green metallic (152), Olive Green metallic (153), Cashmere metallic (143), Brazil Brown metallic (154), Chestnut Red metallic (157), Ascot Grey metallic (151), Graphite metallic (087)
Interior Colors:
Black corduroy, Blue corduroy, Beige corduroy, Grey corduroy, Black leatherette, Blue leatherette, Beige leatherette, Grey leatherette, Black leather, Marine Blue leather, Nylon Brown leather, Grey leather, Fern Green leather, Black cloth with Motorsport stripes (ASS seats only)
Note: These color and upholstery choices apply to German-built M535i models only.