Print 48 comment(s) - last by JediJeb.. on Jun 6 at 6:09 PM

Tesla Model S Signature starts at $105k

As if successfully completing the first commercial mission to the International Space Station and back wasn't enough, Elon Musk is also finding quite a bit of success with his electric venture: Tesla Motors.
Inside Line is reporting today that the Model S Signature Performance, the top-of-the-line trim level, is already sold out and Tesla Motors is no longer accepting pre-orders. Customers now wanting to purchase the Model S Signature Performance will have to be put on a waiting list.
Interestingly, the standard model is still available for pre-order and has a base price of "only" $57,400 before a $7,500 federal tax credit (President Obama wants to see that federal tax credit increased to $10,000). The Signature Performance, however, has a base price of $105,400.
The standard Model S comes with a 40 kWh lithium-ion battery pack (8-year, 100,000-mile warranty), can hit 60 mph in 6.5 seconds and has a top speed of 110 mph. Range is listed at 160 miles.

 Model S Signature at the Tesla Fashion Island Signature Weekend [Image Source: Tesla Motors]
The Signature Performance ups the ante with an 85 kWh lithium-ion battery pack (8-year, unlimited miles warranty). As its name implies, performance improves greatly with 0-60 times dropping to 4.4 seconds while the top speed increases to 130 mph. The maximum driving range of the Signature Performance is listed at 300 miles.
The first deliveries of the Model S Signature Performance will begin on June 22. Those who have ponied up for the standard Model S will receive their vehicles later this fall. Those who haven't already pre-ordered the standard Model S still have time to get in line; Tesla is still accepting $5,000 deposits for the vehicle.

Source: Inside Line

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RE: Efficiency Sweet Spot?
By Mathos on 6/4/2012 4:29:27 PM , Rating: 2
Actually not really true. Peak efficiency for ICE depends on the engine. It has more to do with the RPM that the motor is being ran at, than the speed of the vehicle. Which is why we've starting moving towards 5-8+ speed tranny's instead of the old 3 and 4 speeds that were popular for a long time. Peak efficiency is generally achieved at 2000-2500 RPM, as that is generally the range where you're going to have access to most of the engines torque and power, while still using fairly little fuel.

This is why in most vehicles, if you pay attention to your RPM monitor, if you're not bulldogging it, and speeding up at a good steady pace, you'll notice that your tranny always shifts gears to try and keep you in that RPM range.

RE: Efficiency Sweet Spot?
By Mint on 6/4/2012 5:11:35 PM , Rating: 3
Unfortunately, most engines are producing too much power at the peak efficiency operating point to be useful for cruising.

Speed matters a lot more than running the engine at optimal efficiency. If you need 20hp to cruise at 60mph but only 6hp at 30mph, that 40% reduction in energy needed per mile will be more important than, say, 30% engine efficiency at 20hp vs 25% at 6hp.

Here's an example BSFC chart I googled:
Sure, peak efficiency is at 2500RPM and ~70% throttle, but if you only need 10kW, the optimal efficiency is around 1100RPM and 50% throttle.

RE: Efficiency Sweet Spot?
By Jedi2155 on 6/4/2012 5:42:23 PM , Rating: 2
It also varies a lot depending the auto cycle. The Atkinson cycle on the Prius offers a very linear BFSC:

RE: Efficiency Sweet Spot?
By JediJeb on 6/6/2012 5:06:59 PM , Rating: 2
I had a 79 F150 with a 400CID engine and it got terrible mileage at 40-45mph but almost doubled once you hit 55-60mph(not that the difference between 9mpg and 18mpg is that wonderful). The crazy thing was you got 18mph on the highway if it was empty, or if you were carrying 1000 pounds of load in the bed. I really do miss that truck.

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