Quote:
Originally Posted by Marcoscrdo
Yeah i know, but like what happens when d4s happens. More fuel is put in so more power?
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No, more fuel does not equate to more power necessarily. Otherwise gas guzzling corvettes in the 80s-90s would be banging out double the power stock in their days. D4S simply allows higher efficiency in how fuel is delivered. Higher efficiency = higher output.
Indirect injection = air and fuel mixing before the intake valve opens by the turn of the cam shaft to allow the mixture to enter the the combustion chamber. This is not as efficient as it can be because nebulized air-fuel mixture can condense on the the valve or any surface prior to combustion which leads to incomplete combustion which also leads to smog from unburned fuel. This is why you get stuff building up on your valves over time from unburned fuel carry stuff over the valve itself.
Furthermore, once the mixture is in the chamber there is no more chance for the ECU to adjust how much fuel will enter the combustion chamber through the stroke of the piston.
Direct injection (D4S) is high pressured system that delivers fuel into the combustion chamber directly and the intake valves are free to deliver air without fuel. The high pressured fuel injectors allows for smaller particles of fuel droplets (in essence the fuel will have an overall greater surface area per droplet, the analogy would be splitting a big chunk of wood into smaller chunks to burn). The air and fuel mixture will nebulize within the combustion chamber itself meaning less chance of the fuel recondensing on anything which leads to greater efficiently through a more complete combustion cycle allowing greater power output.
Of course there is all the electronic gadgetry and ecu programming that will measure direct injection more precisely than traditional indirect injection.
At the end of the day, there is a finite amount of energy stored in fuel. No car on the road to this day will harness the entirety of it's stored energy 100%. Most of the energy is lost through heat. Direct injection just gives a better way to burn fuel more efficiently.