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Someone correct me please if I'm wrong in my thinking about this...
but it occurs to me that they could be doing something very clever where they are actually running the ICE rich, and then using the SAS to inject fresh air into the exhaust pre-turbo. Where the extra fuel is then burned and the energy is recovered by the turbo generator. So as a whole the system is 1 lambda but the combustion taking place in the ICE isn't necessarily at stoich. Kind of like back in the day when OEMs tried injecting fresh air into the exhaust to improve emissions, but more productive.
I sound knowledgable by sharing actual concepts, not regurgitating what ChatGPT says. BTW ChatGPT is also misleading. Ask any tuner on the planet if Lambda 1 produces more power. IT'S A LIE! You have to nerf your timing to make this work
What does Chatgpt have to do with this? Check the below website:
Why don't you read the article yourself. Especially this part
Performance Tuning: For naturally aspirated engines, a gasoline AFR of 12.8:1 to 13:1 is typically optimal for maximum torque and horsepower. This corresponds to a Lambda range of 0.83 to 0.85.
Forced Induction Engines: These engines require richer mixtures (lower Lambda) to prevent knocking and manage higher cylinder pressures. A gasoline AFR of 11.5:1 (Lambda 0.78 to 0.8) is often used.
Why don't you read the article yourself. Especially this part
Performance Tuning: For naturally aspirated engines, a gasoline AFR of 12.8:1 to 13:1 is typically optimal for maximum torque and horsepower. This corresponds to a Lambda range of 0.83 to 0.85.
Exactly! Naturally aspirated engines, this engine has an e-turbo which has a bigger pipe, therefore running rich is not required, you do not need to cool it down by extra fuel.
Typical Rennlist when a new model is introduced. Circle back in 6 months and the tone will be different after half the naysayers buy one, and post "so glad I have a 992.2"...
Typical Rennlist when a new model is introduced. Circle back in 6 months and the tone will be different after half the naysayers buy one, and post "so glad I have a 992.2"...
I said Lambda 1 optimizes emissions and fuel efficiency. It's not solely about emissions regulation; it's also about achieving the optimal air-fuel ratio for engine performance. I didn’t contradict myself.
Thank you for removing that comment, I understand that I was not intended.
This is incorrect. An ICE produces maximum power when running rich. Optimal fuel efficiency is achieved by running lean. Lambda 1 is about optimizing catalytic converter performance to reduce emissions, period.
Typical Rennlist when a new model is introduced. Circle back in 6 months and the tone will be different after half the naysayers buy one, and post "so glad I have a 992.2"...
Thx, I always forget about the GTS/SD bumper design. Btw, the air also enters through the side pipes from top, correct? Also, just looking at it it always seems more logical to me that when driving the air gets also pushed into this lower vents and up to the intercooler than other way around...but I guess that what just always throws me off and makes me think of it wrong. Just seems akward that the air has to be pushed forward and down to exit through the sides.
I believe this is a Turbo/Turbo S that receives an extra shove of cooling air from the side ducts behind the doors. Or I just don't know where that air source is coming from.
No, air flows smoothest over the top and sides of the car. Unless there are specific air channels in the underside of the car, the air from the bottom behind the wheels is turbulent so it makes more sense for the extraction to be done at the bottom. Remember too that there is no active suction of the air to pass over the intercoolers. There isn't a fan or anything like that over them. They are purely relying on the aerodynamic shape of the car to move air over them. Thermodynamics and wind tunnel science blah blah blah.
I believe this is a Turbo/Turbo S that receives an extra shove of cooling air from the side ducts behind the doors. Or I just don't know where that air source is coming from.
No, air flows smoothest over the top and sides of the car. Unless there are specific air channels in the underside of the car, the air from the bottom behind the wheels is turbulent so it makes more sense for the extraction to be done at the bottom. Remember too that there is no active suction of the air to pass over the intercoolers. There isn't a fan or anything like that over them. They are purely relying on the aerodynamic shape of the car to move air over them. Thermodynamics and wind tunnel science blah blah blah.
On the 992.1 Turbo-series, cooling air comes exclusively from the intake behind the rear glass. The side intakes behind the doors feed air to the engine intake in conjunction with air coming from the intake behind the rear glass:
Typical Rennlist when a new model is introduced. Circle back in 6 months and the tone will be different after half the naysayers buy one, and post "so glad I have a 992.2"...
The Base car buyers will be happy . The Base is an improvement . Eventually the manual guys will be happy with a Carrera T . The controversy surrounds the hybrid and is different than the 991.2 was (going all turbo) . Porsche had plenty of experience making street version turbo cars unlike now where this hybrid is not just new .. it's uncalled for . The only reason why it exists is because legislators want it to exist . It's also a transitionary car heading into the direction of all EV .
The government is thrilled but investors are not . They called a meeting . They want Porsche leadership to back off with the EV kool aid because it's not working . (see attached ) https://www.ml-vehicle.com/news/pors...-78044771.html
06-18-2024, 05:14 PM
