you're reading...
Motoring News

Porsche Tuner RUF Goes Electric With eRUF Concept (2008)

Specialist Porsche after-market tuner, RUF, has unveiled the eRUF Model A concept, a 911 equipped with a three-phase electric motor that develops 150 kW and an impressive 650 Nm from 0 rpm onwards – enough to get the vehicle moving from standstill in 6th gear!While a 0-100 km/h time of seven seconds and a top speed of 160 km/h is not what you would normally expect from a Porsche, this is still mightily impressive when you consider power comes from a iron-phosphate, lithium-ion battery pack and not one of the German marque’s famous 6-cylinder, boxer engines.

Weighing in at a porky 1910, the only thing that sets the eRUF Concept apart from regular 911’s is the lack of a sonorous engine note and the new term: “flooring the ‘amp’ pedal”.The Official RUF Press Release:

eRUF Concept Model A 2008

“Emotion without Emission”

Ruf Automobile GmbH, internationally well known manufacturer for high performance
automobiles and the producer of the famous CTR-series is now introducing the first
electrically powered sports car from Germany.

The fundamental ideas that lead to the development of the eRUF concept vehicle came from
Alois Ruf. The car maker from the Bavarian town of Pfaffenhausen had a vision of a simple
energy transfer concept: his hydroelectric power plants, which feed 35 million kW hours of
electricity annually into the German electrical network, could also more or less directly power
modern autos. 35 million kWh is enough energy to power one of the prototypes eRUF as
described below for 3500 journeys around the globe – or 3500 of the cars one time around the world each.

The idea seemed even more inspiring, as it would be possible for him to connect cars directly
to the emission-free power plants for charging and drive away on the water-generated power. The eRUF Model A concept car is the first prototype to lead the technical development away from the combustion engine.

Actually, for the first time an electric motor is being used which comes to fitting into the Ruf
model range.

The three-phase AC motor’s performance easily puts many conventional conbustion engines
to shame. It produces its maximum 650 Nm torque output from 0 rpm onwards. This power
rips into the drive shafts so impressively during acceleration, that one is immediately
reminded of the extremely powerful Ruf Rt 12

It is actually enough simply to put the car in 6th gear and press down the accelerator pedal (an “amp pedal”, not a “gas pedal” in this car!), and drive off. The eRUF Model A has such impressive acceleration that the project goal of 0-100 km/h in under 7 seconds was achieved.

The maximum power output is around 204 hp if you translate it into combustion engine terms.
In direct connection to Volt and Ampere the maximum output level of 150 kW is a useful

A short discourse regarding efficiency might be helpful at this point: a highly-developed,
modern petrol engine uses around 75 percent of the energy in its tank to heat the engine
coolant and exhaust gas and only 25 to 30 per cent for actual propulsion. A diesel manages to convert a respectable 35 to 40 percent of its fuel energy into motion. The permanent magnet electric motor, on the other hand, is a model of high efficiency: it offers over 80 percent efficiency over the majority of its power range, extending 90 per cent in the upper end of its power range.

Ruf engaged CALMOTORS in Camarillo, California, specialized in the implementation of
hybrid electric and electric only power train designed to combine the latest generation of
lithium-ion batteries with its motor.

Since the 150 kW electric motor unit is very compact, there is a lot of room for batteries in the
Ruf’s bodywork.

The Axeon iron-phosphate, lithium-ion batteries currently in use weight 5.6 kg and deliver
160 Ah each. This means each one could theoretically deliver 160 amperes of electricity for
one hour under normal temperatures or 1 ampere for 160 hours.

The generation of batteries available from Axeon represents by no means the end of the
developmental curve. Current performance improvements in battery technology indicate that
end of this improvement spiral is nowhere near.

The driving current in the eRUF is regulated by an electric “drive-by-wire” accelerator pedal.
It is not the first electrical accelerator in a Ruf model. Other Ruf models also provided load
control via potentiometer-pedals, nicely dosed for their powerful engines.

The power and torque produced by the 3-phase motor can be used to recover just as much
power as it can put out. When coasting, the motor becomes a generator producing electricity
to charge the batteries. The torque and electrical amperage ratings below are therefore to be
understood as theoretical absolute maximums and minimums.

The 96-cell battery system is constantly monitored by an intelligent bus system from Axeon.
Each individual cell is coupled with a sensor that sends critical information on cell
temperature and voltage to the central control system. If irregularities appear during operation, the system can react within milliseconds to bring the values back in line,
effectively preventing critical lithium-ion overheating behaviour during charging.

Tech specs for the eRUF model A, status of September 2008
All data are preliminary data as specified for the eRUF Model A

Drive Performance

  • Acceleration 0-60 mph under 7.0 sec (development target)
  • Vmax 160 mph, 225 km/h
  • Cw 0.28
  • Roll resistance 0.014
  • Driving range approximately 250 – 320 km, depending on performance level
  • Specific power pick-up 21 kW / 125 km/h

Vehicle data

  • Engine power 150 kW / 204 PS
  • Max torque 650 Nm 7 0 rpm
  • Weight 1910 kg (preliminary data)
  • Battery weight 550 kg

Motor Data

  • Max torque 650 Nm to -650 Nm
  • Power 150 kW to -150 kW (peak level)
    204 hp to -204 hp
    100 kW / 136 hp continuous
  • Currency 300 – 420 Volt
  • Current level max 550 A
  • Rpm level max 5000 rpm
  • Operating system brushless three phase alternating current with permanent magnets


  • Diameter 405 mm
  • Length 241 mm
  • Weight 91 kg
  • Specific weight 1,65 kW / kg, 2,25 hp / kg
  • Coolant flow 8 L /min max

Battery System

  • Type Lithium-Ion, iron-phosphate base
  • Manufacturer Axeon plc, GB
  • Stored Energy (96 units) 50,72 kWh
  • Nominal Voltage 317 Volt
  • Maximum discharge 480 A
  • Max Power 152,16 kW = 210 PS
  • Charging current, max. 16 A
  • Charging time 10 hours

Single Battery Cell Data

  • Capacity 160 Ah
  • Operating voltage 4,25 V charging, 2,5 Volt discharging
  • Nominal Voltage 3,3 Volt
  • Max. Temperature Level 80 °C
  • Life cycle 3000 charging cycles
  • Self-discharge under 3 % per month
  • Weight per Unit 5,6 kg

October 14th 2008

About Craig Hill

Teacher and Writer. Writing has been cited in New York Times, BBC, Fox News, Aljazeera, Philippines Star, South China Morning Post, National Interest, news.com.au, Wikipedia and others.


One thought on “Porsche Tuner RUF Goes Electric With eRUF Concept (2008)

  1. Nice German car again !!!!! They are very good on what they do with their cars …

    Posted by viveka | March 28, 2012, 17:05

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

If you liked what you just read, click "Subscribe" to become a follower of the Craig Hill site. You will receive an email each time a new post is published.

Join 15,050 other followers

An archive of all my old posts

Follow me on Twitter

Most Recent Posts Post on My Blog About China: China News

Cadence Column: Asia, January 17, 2022

Cadence Column: Asia, January 17, 2022

China is illegal. The US Department of State even says so. France even reports as such. This won’t exactly improve friendly relations across the Pacific. It’s actually a much larger step to an all out conflict. Just over a year ago, November 2020, Western allies declared that China’s 1984 treaty with Britain, the basis for […]

India’s offensive against China should be in the grey zone 

India’s offensive against China should be in the grey zone 

Grey zone is not a fixed concept but a hypothetical place between peace and war. While I was writing this article, a never heard of development was taking place in the Indian state of Punjab. The Indian Prime Minister was stuck on a bridge for 20 minutes since the highway was blocked by the protesters. […]

Cadence Column: Asia, January 10, 2022

Cadence Column: Asia, January 10, 2022

Lithuania has become the “Taiwan of Europe”. Since WWII, Americans never again struggled with the concept that a problem abroad is a problem at home. This is how we Americans can vote to interfere around the world that we know so little about. We think every squeal from another continent indicates a personal assault on […]

Is China ready to host the Winter Olympics?

Is China ready to host the Winter Olympics?

Chinese officials have promised that the 2022 Winter Olympics — to be held Feb. 4 to 20 and followed by the Paralympics March 4-13 — will be a “safe, streamlined and splendid” global event. But that won’t be easy. With less than four weeks to go, China is struggling to enforce its strict zero-covid policy […]

Crystal Gazing 2022: India and The World 

Crystal Gazing 2022: India and The World 

If we thought 2019 and 2020 presented uncertainties then 2022 is here to surprise all of us. It could be remembered as one of the most complex, unpredictable, and potentially dangerous years in the recent past. COVID-19, oil crossing $100/barrel, Iran-US nuclear talks, Iran-Israel tension, artificial intelligence, big data analytics, cryptocurrency, and militarization of outer […]

Japan looks west to guard against a rising China

Japan looks west to guard against a rising China

Japan signed on Thursday a new security treaty with Australia, a fellow middle power that is similarly aligning against an increasingly assertive China. The blandly-branded Reciprocal Access Agreement, which was signed virtually by Australian Prime Minister Scott Morrison and Japanese Prime Minister Fumio Kishida, marks the conclusion of a process that started in 2014, when […]

Cadence Column: Asia, January 3, 2022

Cadence Column: Asia, January 3, 2022

Taiwan is on the rise. With chip shortages, stock is booming. You know how graphics cards are astronomically high? A lot of that money is going into Taiwan. Meanwhile, China found an excuse to order a real estate developer to demolish 39 freshly, new-built “luxury apartments”—something about the building permit being illegal and violated zoning. […]

Cadence Column: Asia, December 27, 2021

Cadence Column: Asia, December 27, 2021

Japan is on the scene in the Pacific. While Japanese athletes will attend the Olympics, Japanese officials will not. China doesn’t want Japan to “politicize” the games. But, consider 2008, the one-hour opening ceremony about nothing but China’s history, with President Xi marching in to a one-world dream at the end. For Beijing, hosting the […]

Cadence Column: Asia, December 20, 2021

Cadence Column: Asia, December 20, 2021

The US is hitting China hard over treatment of Uyghurs. Nearly all imports from Xinjiang will be banned. At the same time, the US bolsters the call to bolster Taiwan’s military defense. However, Taiwan has the seeds of the same tyranny; it just doesn’t materialize into anything alarming because Taiwan remains small. The most obvious […]

When India goes to war with China 

When India goes to war with China 

It is an open secret that China challenges everything India sets its eyes on, be it cooperation with Quad partners (the United States, Australia, Japan), international organizations like United Nations, WHO, or designating a terrorist organization. India, a Quad member and a close ally of the United States, has become the biggest eyesore for China. […]

%d bloggers like this: