Detroit Auto Show: Subaru B5-TPH

The name certainly doesn’t roll off the tongue, but the Subaru B5-TPH is sweet to say because of what those letters stand for – Turbo Parallel Hybrid. The TPH drivetrain consists of a 10kW electric motor sandwhiched between the transmission and turbocharged boxer engine. The gasoline engine produces 256 hp and 253 lbs-ft of torque, while the electric motor antes up another 111 lbs-ft of torque. That extra torque is provided by the electric motor at low speeds while the turbo spools up, effectively eliminating turbo lag. The engine also employs the Miller cycle, which increases the engine’s efficiency up to 30 percent by leaving the intake valve open for part of the compression stroke, which shortens the cycle's compression stroke. All of this leads to a combined estimated mileage of 40 mpg and a whopping good time when you mash pedal.
More pics and official press release after the jump…




















Subaru Hybrid Concept Vehicle Makes North American Debut;
New Technologies Point to Brand’s Hybrid Strategy
-- Company continues “green” efforts to help safeguard the environment --
DETROIT, Jan. 9, 2006 – The Subaru B5-TPH, a new type of high-performance hybrid-powered vehicle, made its North American Debut today at the 2006 North American International Auto Show. The B5-TPH concept vehicle features the company’s emerging Turbo Parallel Hybrid (TPH) powertrain system and lithium-ion battery technology in a sporty two-seat grand touring car.
Subaru parent company Fuji Heavy Industries (FHI) has been developing the TPH powertrain for future mass production and will test-launch TPH-powered vehicles in the Japanese market in 2007.
Also at the 2006 North American International Auto Show, Subaru showcased a test version of its R1e urban electric vehicle equipped with next-generation long-life lithium-ion type batteries from NEC Lamilion Energy. That company was jointly established by NEC and FHI in 2002 for the development of secondary batteries. Designed to meet the needs of city mobility, the Subaru R1e is projected to achieve an 80% recharge in about fifteen minutes. The resulting charge can supply enough power to serve most daily commuting needs in congested urban areas.
These high-technology Subaru vehicles are parts of the company’s broad approach to environmental responsibility that also takes into account current vehicle emissions and fuel efficiency, as well as reduced environmental impact from all facets of automobile development, production and marketing.
“Subaru has always been, and will continue to be, committed to safeguarding the natural environment that so many of our customers avidly enjoy,” said Kunio Ishigami, chairman, president and CEO, Subaru of America, Inc. “We will continue to make these technologies a priority in our product development, manufacturing and business processes.”
New Turbo Hybrid Powertrain Previews New Subaru Core Technology
The Subaru B5-TPH carries a revolutionary powertrain system beneath sporty bodywork. This vehicle’s TPH powertrain is a strategically important technology for the power source of clean-energy vehicles and will be incorporated with the Subaru core technologies including the Subaru Boxer Engine and Symmetrical All-Wheel-Drive system.
The Subaru TPH powertrain in the B5-TPH places a thin, 10-kW motor generator between a vehicle’s engine and its automatic transmission. The combination of the motor-generator and the turbocharged Subaru Boxer engine creates a system that not only provides power in the mid-speed ranges when the turbocharger is active -- as with conventional turbo models -- but it also delivers excellent acceleration and fuel economy. This superb, all-range performance has been enabled by electric motor-assist, a feature that is designed to boost engine torque at low speeds.
For even greater efficiency, the TPH gasoline engine adopts the Miller cycle. A Miller-cycle engine leaves the intake valve open during part of the compression stroke, effectively shortening the compression stroke to avoid detonation. However, due to the turbocharger, the cylinder still packs a larger “charge” than would a conventional-cycle engine. In the Subaru B5-TPH, the Miller Cycle turbo boxer engine operates up to 30 percent more efficiently than a conventional gasoline engine.
In order to bring out even better driving performance from the TPH, Subaru is planning to equip the system with high-performance manganese lithium-ion batteries.
Lithium-ion Battery Technology Opens Up New Possibilities
Subaru is committed to the development of power storage technologies as the key to further promote the use of hybrid vehicles, fuel cell vehicles, and battery electric vehicles. Consequently, FHI has been concentrating specifically on the development of power storage systems and the application of NEC Lamilion Energy high-capacity manganese Li-ion batteries on prototype vehicles, including the Subaru R1e electric vehicle, for further testing and evaluation.
In addition, FHI is currently conducting performance tests on prototype cells of the new Li-ion capacitor. The eventual successful commercialization of Li-ion capacitors for compact cars would open up many other business opportunities, including helping to meet the increased demand for new hybrid buses, trucks, and other passenger vehicles. This new capacitor also has the potential to be an alternative to conventional lead-acid batteries in the future.












Reader Comments (Page 1 of 2)
A Hilter 7:22PM (2/14/2006)
I think this car looks excellent except for that stupid front end thing they are trying to push. The car looks like an Impreza crossed with an Audi. You people are idiots.
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ngrundhofer 2:41AM (2/19/2006)
Have always loved Subaru. Would buy this or the R1e in a sec. Love all that horse power and torque.
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silkworm 10:13AM (2/20/2006)
what an ugly car. what are these designers on? do they not speak to anyone?
great engine though
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Belinda 1:28PM (6/30/2006)
The TPH is a sweet engine, and I hope Subaru decides to go with it... I can't wait to get my hands on this vehicle, and my foot on its pedal. I got my first Subaru 5 years ago, and I'm hooked. I don't think they can lose with the B5-TPH.
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JBallhorn 12:26PM (12/29/2006)
As a diehard Subaru driver I've been wondering when they would get into the hybrid market. I would probably buy this car if it were available. I would definitely buy it if it offered greater fuel effiency. 40 mpg doesn't cut it. The Honda Insight gets up to 70mpg. The VW Rabbit got about 44 mpg back in the '70's.
Please Subaru, don't make me buy a Toyota!
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Richard Poor 5:00PM (1/10/2007)
Interesting Subaru but needs to be built with 4 doors as a Forester and PHEV.
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Jake 2:43AM (4/06/2007)
Oh give me a break guys, this car is awesome. personally, i like the way it looks.
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Spock2428 9:59AM (5/24/2007)
Subies get the front right and the back of the car is boring. Its like the designers left and headed to driving the car instead....
Subaru please note that most people would be viewing the Subie from the back as it goes past...
Best of all the Killer milage and Subie AWD, Turbo and kick..Yea..!!!!
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gary 4:05PM (10/18/2007)
Keeping up with the times I say. Awesome mecanicals and if it had a Masserati badge on it you would probably think it's really cool. They've come a long way since their XT wedge design.
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MattB 8:57PM (1/09/2006)
I've said this with the Tribeca and I'll say it again:
Yikes.
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Devin Lussier 9:06PM (1/09/2006)
Not too bad. With a little tweaking it could make for a good competitor to the Volvo C30.
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jemtec 9:33PM (1/09/2006)
I like the car except for the rear end.
Feels 1970's retro.
Alter the tailight to a led bar (can go clear across) and alter the rear bumper and you have a decent design.
The front is way better than the tribeca.
Has potential though.
Just hope they listen to the public closely.
Keep in mind this is a "concept" so there is plenty of time to make adjustments for the US market.
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roadside observer 9:37PM (1/09/2006)
Ye gods!!!
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Steve S 9:38PM (1/09/2006)
Subaru for some reason just can not design a good looking vehicle.
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matt 9:58PM (1/09/2006)
a bit tweaking to match the C30? first of all Volvo is a chicks car, has a inferior AWD system..... and has over 100lb of torque less ..... so clearly the subaru would smoke the volvo.. oh and volvo is less reliable.
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R? 10:04PM (1/09/2006)
The concept is realy ugly. But the engine! Amazing.
250hp, 250lbs-ft, 40 mgp... Put this in the next Impreza and you have a buyer!
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FX Viewer 10:25PM (1/09/2006)
B5-TPH looks like 85-MPH
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ebm14 10:44PM (1/09/2006)
I think this will be the next Impreza, but the style is way off. It looks way to weird and they need some Italian designer to get their design worked out.
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James Sonne 10:46PM (1/09/2006)
Just wait until this TPH engine becomes the standard in Subarus. Can't wait until my Outback can have that much torque and that great a fuel economy.
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G. Snyder 10:52PM (1/09/2006)
#5 - Volvo is a chicks car? Haldex is inferior? Confused.
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