Electric Porsche 928 Sheds 400 Pounds and Three Gears to Make One Man Happy

Jeff McCabe owns a Porsche 928. However, he wanted an electric Porsche 928 in the vein of the Tesla Roadster that he can't afford. So here's what Jeff did: he removed "over 1,700 lbs" of dead weight by eliminating a bunch of useless stuff like the standard engine, transmission (actually just 1st, 4th, and 5th gears), and a bunch of electronics, pop-up headlights, and so on.

He also replaced the wheels and brakes with lighter units and made sure to ace that heavy glass. Once that 1,700 pounds was in the trash, he added 1,300 pounds in the form of 750 lithium iron-phosphate cells (he originally used lead acid batteries).

The result is a car that can go for 115+ miles before it needs a recharge (versus the ~45 from the lead acid units) and can hit 85 miles per hour (137km/h). Too bad it can't do 88. For some info straight from the owner of the car, check out the vid below. Anyone interested in providing him with a CVT?

By Phil Alex

Via: Autoblog Green

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The Porsche 928, part 4

The 928 S4 variant debuted in the second half of 1986 as a 1987 model, an updated version of the 5.0 L V8 for all markets producing 320 PS (235 kW/316 hp), spotting a new single-disc clutch in manual gearbox cars, larger torquen converter in automatics and fairly significant styling updates which gave the car a cleaner, sleeker look. S4 was much closer in being truly world car than previous models as only major differences between ROW and US models were instrumentation in either kilometers or miles, lighting, front and rear bumper shocks and availability without catalytic converter in many ROW markets. Australian market version was only one with different horsepower rating at 300 PS (221 kW/296 hp) due to preparation for possible low grade fuel. Even this was achieved without engine changes.

A Club Sport variant which was up to 100 Kg lighter became available to continental Europe and USA in 1988. This model was watered down version of 1987 factory prototype which had lightened body and 10.9:1 compression ratio engine. Also in 1987 factory made four white lightened manual gearbox S4 for racecar drivers who were on factory payroll at the time. These were close to same as later actual Club Sport models and can also be considered prototypes for it. An SE (sometimes called the S4 Sport due to model designation on rear bumper), a sort of halfway point between a normally equipped S4 and the more race-oriented Club Sport, became available to the UK. It's generally believed these Porsche Motorsport engined cars have more hp than the S4. They utilize parts which later became known as GT pistons, cams, engine ECU programs and a stronger, short geared manual gearbox. The automatic gearbox was not available.

For 1989 model year visible change inside was digital trip computer in dashboard. At same time Australian model received same 320 PS (235 kW/316 hp) engine management setup as other markets. Porsche debuted the 928 GT in the late winter 1988/89 after dropping the slow selling CS and SE. In terms of equipment, the GT was most like the 928 SE, having more equipment than a Club Sport model but less than a 928 S4 to keep the weight down somewhat. It had the ZF 40% limited-slip differential as standard like the Club Sport and SE before it. Also like the CS and SE, the GT was only available with a manual gearbox. ROW 1989 CS and GT wheels had an RDK tire pressure monitoring system as standard. This was also optional for same year ROW S4. For 1990 model year Porsche made RDK and a 0-100% variable ratio limited-slip called PSD (Porsche SperrDifferential) standard in both GT and S4 models for all markets. This system is much like the one from the 959 and gives the vehicle even more grip. In 1990 the S4 was no longer available with a manual gearbox.

The S4 and GT variants were both cut at end of 1991 model year, making way for the final version of the 928. The 928 GTS came for sale in late 1991 as a 1992 model in Europe and in spring of 1992 as an early 1993 model in North America. Changed bodywork, larger front brakes and a new, more powerful 5.4 L, 350 PS (257 kW/345 hp) engine were the big advertised changes; what Porsche wasn't advertising was the price. Loaded GTS models could eclipse $100,000 USD in 1995, making them among the most expensive cars on the road at the time. This severely hampered sales despite the model's high competancy and long standard equipment list. Porsche discontinued the GTS model that year after shipping only 77 of them to the United States. Total worldwide production for all years was a little over 61,000 cars.

Second-hand models have largely fallen in value, the result of generally high maintenance costs due largely to spare parts that are expensive to manufacture. The earliest versions, however, especially those models with the Bosch K-Jetronic (CIS) injection system, have few electronic components and therefore can be repaired more easily provided spare parts can be found. Various enthusiast supported parts suppliers exist, especially in the United States.

The GTS model has retained a high value however, and as of 2006 the price for all variants is apparently starting to creep upwards (Classic Motorsports, March, 2006 issue, p. 38). A great community dedicated to the 928 exists online even today, and the car has won a huge fan base. The 928 was such a powerful vehicle in its day that even models 25+ years old are able to outperform current sport/grand-touring models of various manufacture.

With the release of the Cayenne sports utility vehicle, Porsche has met with renewed success with a front-engined, V8-powered model. The company's 2005 announcement that a new V8-powered 4-door grand tourer model called Panamera would be launched in 2009 fueled rumours and fan speculation of a reborn 928. Although the Panamera will be a 4-door model, Road and Track magazine published a speculative piece in their April 2006 issue in regards to the possibility of a new, 928-esque coupe that may debut on a shortened version of the Panamera's platform sometime around the 2011 or 2012 model years. Although feasible, this is pure speculation as of 2006. The article seemed to indicate a re-use of the 928 nameplate although Porsche's recent tendency to give non-numerical names to their vehicles and a desire to separate the vehicle from past models may preclude the possibility of calling the vehicle 928.

Also noteworthy is that there are several manufacturers of supercharger and turbo kits specifically for the 928. The stock engine for any year is capable of handling significant power increases without part failure. More owners have opted for supercharging their vehicles as the conversion is reasonably straight forward whereas the fitting of two turbo chargers on each of the exhaust manifolds has caused problems because of the lack of space.

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The Porsche 928, part 2

The 928 featured a large, front-mounted and water-cooled V8 engine driving the rear wheels. Originally displacing 4.5 L and featuring a single overhead camshaft design, it produced 219 hp (163 kW/222 PS) for the North American market and 240 PS (176 kW/237 hp) in other markets. Porsche upgraded the engine from mechanical to electronic fuel injection in 1980 for US models, although power remained the same. This design marked a major change in direction for Porsche (started with the introduction of the 924 in 1976), whose cars had until then used only rear- or mid-mounted air-cooled flat engines with four or six cylinders.

Porsche utilized a transaxle in the 928 to help achieve 50/50 front/rear weight distribution, aiding the car's balance. Although it weighed more than the difficult to handle 911, its more neutral weight balance and higher power output gave it similar performance on the track. The 928 was regarded as the more relaxing car to drive at the time. It came with either a five-speed dog leg manual transmission, or a Mercedes-Benz-derived automatic transmission, originally with three speeds, with four speed from 1983 in North America and 1984 in other markets. More than half of production had the automatic transmission. Exact percentage of manual gearbox cars for entire production run is not known but its believed to be between 25 and 30%.

The body, styled by Wolfgang Möbius under guidance of Anatole Lapine, was mainly galvanised steel, but the doors, front fenders and hood were aluminium. It had a substantial luggage area accessed via a large hatchback. The new polyurethane elastic bumpers were integrated into the nose and tail and covered in body-coloured plastic; an unusual feature for the time that aided the car visually and reduced its drag. Porsche opted not to offer a convertible variant but some aftermarket modifiers offer convertible conversions.

The 928 qualified as a 2+2, having two small seats in the rear. Both rear seats could be folded down to enlarge the luggage area, and both the front and rear seats had sun visors for occupants. The 928 was also the first vehicle in which the instrument binnacle moved with the adjustable steering wheel, a feature seen more recently on Nissan's 350Z sports car.

The 928 included several other innovations such as the "Weissach Axle", an early all-wheel steering system that provides passive rear-wheel steering in certain off-throttle cornering situations, and an unsleeved, silicon alloy engine block made of aluminium, which reduced weight and provided a highly durable cylinder bore. The concept of all-wheel steering was also adopted later on to several Japanese automobiles, including a Japanese-market version of the Toyota Celica, the Mitsubishi 3000GT VR-4 and the second generation Nissan 300ZX.

Porsche's design and development efforts paid off during the 1978 European Car of the Year competition where the 928 won against the BMW 7-series and the Ford Granada. The 928 is the only sports car so far to have won this competition, where the usual winners are mainstream hatchbacks and sedans/saloons from major European manufacturers. Proof of how advanced the 928 was compared to its contemporaries.

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The Porsche 928, part 1

The Porsche 928 is a grand tourer automobile made by Porsche AG of Germany from 1978 model year to 1995 model year, during which time it was one of their most expensive offerings.

Porsche's marketing slogan "It's about as fast as you can go without having to eat airline food" or "It is as fast as you can go without hiring a flight attendant" from the late 1980s where at one point it was the fastest production road-car in the world, having been recorded at 172mph on the salt flats in Utah in 1986 using an early 928 S4. This particular car was originally white but was sprayed bright red for the record attempt to make it stand out more against the salt in marketing material like videos and posters.

By the late 1960s, Porsche had changed significantly as a company, and executives including owner Ferry Porsche were toying with the idea of adding a luxury touring car to the line-up. Managing Director Ernst Fuhrmann was also pressuring Ferdinand to "greenlight" development of the new model in light of concerns that the current flagship at the time, the 911, was quickly reaching its maximum potential where it could soon no longer be improved upon. Slumping sales of the 911 seemed to confirm that the model was approaching the end of its economical life cycle. Fuhrmann envisioned the new range-topping model as being the best possible combination of a sports coupe and a luxury sedan, something well equipped and comfortable enough to be easily driven over long distances that also had the power, poise and handling prowess necessary to be driven like a sports car. This set it apart from the 911, which was a pure sports car.

Ordered by Ferry Porsche to come up with a production-feasible concept for his new model, Fuhrmann initiated a design study in 1971, eventually taking from the process the final specs for the 928. Several drivetrain layouts were considered during early development, including rear and mid-engined designs, but most were dismissed because of technical and/or legislative difficulties. Having the engine, transmission, catalytic converter(s) and exhaust all cramped into a small rear engine bay made emission and noise control more difficult, something Porsche was already facing problems with on the 911 and wanted to avoid. After deciding that the mid-engine layout didn't allow enough room in the passenger compartment, a front engine/rear wheel drive layout was chosen. Porsche also feared at the time that the U.S. government would ban the sale of rear-engined cars in response to the consumer outrage over the Chevrolet Corvair, started by Ralph Nader via his book "Unsafe at Any Speed".

Porsche engineers wanted a large-displacement motor to power the 928, and prototype units were built with a 5.0 L V8 producing close to 300 hp. Very early units used one four-barrel carburetor, which was eventually tossed in favor of Bosch's K-Jetronic fuel injection system. When increasing concern within the company over the pricing and availability of fuel during the oil crisis of the 1970s became an issue of contention, smaller engines were considered in the interest of fuel economy. Some managers began pushing for development of a 3.3 L 180 hp powerplant they had drawn up specs for, but company engineers balked at this suggestion. Both sides finally settled on a 4.5 L, SOHC 16-valve V8 producing 240 PS (219 hp in North America), which they considered to have an acceptable compromise of performance and fuel economy.

The finished car debuted at the 1977 Geneva Motor Show before going on sale later that year as a 1978 model. Although it won early acclaim for its comfort and power, sales were slow. Base prices were much higher than that of the previous range-topping model and its larger size and somewhat odd futuristic styling put off many purists who were more attracted to more compact 911.

Fuhrman's replacement, Peter Schutz, decided that the models should be sold side by side, feeling that the 911 still had potential in the company's line-up. Legislation against rear-engined vehicles also didn't materialize. Although the 928 developed an avid fan following, it never sold in the numbers that Fuhrmann had originally predicted and was discontinued in 1995. The size of the market for expensive and extravagant grand tourers has increased since then, and the company is again looking to capture this market with the Porsche Panamera four-door GT.

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