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The Autoweek I got yesterday (Mitsubishi Evo on the cover) had a small blurb about Porsche adding direct injection to their lineup in 2008 (as an '09?). Cayman included. Said the turbo would be good for 500 horsepower.
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I think Autoweek had predicted that direct injection would show up in the 997 turbo, they also said it would have DSG. Sooner or later all Porsches will have direct injection and DSG availability. If they keep predicting, sooner or later they will inevitably be right.
On the other hand, according to Car Magazine, the 911 Turbo being shown at 2009 Geneva Auto Show will have DI. That would imply DI will be in the Turbo for MY2010. I tend to doubt that Cayman would get DI before Turbo but I guess it's possible (e.g., Cayenne).
I will also be interested to see how much DI improves performance (power & efficiency). It may not be quite as great as expected for the Porsche engines. In particular, DI achieves higher efficiency, in part, because it allows for higher compression ratios, which in turn allow greater energy recovery per piston stroke. However, the flat six in the Cayman S is already operating at a compression ratio of 11.1. Audi's 3.2 DI V-6 is only marginally better at 11.3.
But since the MY '08 cars are already on the street, I'm sure what Autoweek meant (I usually get my copy on Thursdays) is that it will be introduced at the end of 2008 for MY 2009 cars. I'll bet it won't be across the whole line either.
brad
__________________
21-year PCA Member
PCA DE Instructor
This was in UK autocar this week as well (they sister magazines?), apparently 911, Cayman and Boxster in 2008, which would mean '09 model year. Quoted 10% power increase and better MPG.
direct injection uses the same engine as the 3.4L in CS now?
can it be added to older Cayman S?
im not sure how it works...
To answer your question, 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. With DFI, fuel is sprayed directly into the combustion chamber versus traditional fuel injectors that is where the fuel savings and power comes from. DFI cuts emissions by warming up the catalytic converter more quickly, and ensures a sharper throttle response.
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.
It is my understanding that this cannot be added to existing 3.4L since it is a different injection set-up.
DFI
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.
Porsche can be very unpredictable in when they launch their new and facelift models--But not in this case! I think dfi will happen 2008 summer ie 2009 models (The 997 appears a few months ahead of the 987s). Cause they are going launch the 4 door Porsche in 9/09-Frankfurt Show.
They need to launch something new every year!
The excitement is how much extra bhp our cayman s is going to get! I will be very surprise if we get anything more than 315bhp!
For non s model, there will be less gain cause the current 2.7l engine is running a higher than normal specific output!
DFI
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.
