<soapbox>Today I received the 997 "Minikatalog" touting the new 911s. By now, we know all about the 911,
DFI, PDK, etc., given the writeups in WatchCatalogus and
Panorama. Why does Porsche waste money on glossy hardcover marketing materials? Do they assume that the typical Porsche owner is completely oblivious to what's going on? Perhaps if their target demographic simply owns the car for its status, but the rest of us pay attention.
But what really amused me was this: On the outside of the package the mail sticker reads "Time Sensitive Material".
What is so time sensitive about this? Are they going to "run" out of the 911s at the dealership? Better run over there right NOW and get me one or two...
Or did Porsche know that the market was going to tank, and so they wanted you to buy before your portfolio completely evaporates? Too bad: The cover letter was dated August 29, 2008 and I received it today, September 17. Perhaps if I got it last week, things would be different?
Nahhh....
Ohh, and what's with the little 911 "trading cards" on the first page? Are we supposed to cut these out and put it in our wallets to remind us of our "dream car"? Or just trade them with your friends? Collect all 4!!!
Its sad that such a fine machine is marketed by such dimwits.
</soapbox>
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DFI
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Direct Fuel Injection (DFI), is a new technology that Porsche states can cut fuel consumption by up to 15 percent, while increasing power by up to 13 percent. DFI cuts emissions by warming up the catalytic converter more quickly, and ensures a sharper throttle response. Better for your right foot - and the planet, then.
DFI allows much more precise measurement of fuel supply and injection at pressures up to 120 bar; it has numerous combustion modes, with different cycles for cold-starting, low-speed driving and performance driving.
As the name suggests, DFI injects fuel directly into the individual combustion chambers, instead of the intake manifold. The injector valves have an electromagnetic mechanism that controls each injection with astonishing precision, while a high-pressure pump provides the necessary pressure—up to 1,740 psi—to accompany the rapid fire of the fuel injection.
Precise geometry of the injector’s position and its spray pattern is a key factor in helping to improve power, torque and emissions of the engines. The specific placement of the fuel as it enters each chamber creates a swirl that improves the air/fuel mixture, and therefore the overall combustion process.
At engine speeds up to 3500 rpm, a double-injection process is used. In this mode, the required fuel volume is delivered in two successive injections per working stroke. The resulting benefits include faster catalyst warm-up and increased torque in the upper load range.
By forming the air/fuel mix directly in the combustion chamber, DFI contributes to engine cooling. As a result, it is possible to increase the compression ratio and with it the power and efficiency of the engine.
The direct injection process is continuously adjusted. The engine management system reads changes to throttle inputs and performance requirements and, as you drive, the air/fuel mix is monitored and adapted as required. Oxygen sensor circuits within the exhaust system provide accurate emissions control. |
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Linear Mode
