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4 Posts
Hey guys, new member here. Don't have the car, just curious about it.
I read on the Scion website that they have "Direct Ignition", which doesn't sound any different than any other gas car with the placement of the spark plugs.
There are a few critical things that can be done differently to the engines in the USA today, Scion, Honda, GM everyone should have the following features in their car;
1. Direct Injection into the cylinder instead of multiport fuel injection, 5-10% increase in efficiency there.
2. Get rid of transmissions with torque converters (traditional automatics) and put in CVTs, dual dry clutch automatics and traditional manual transmissions. Not suprising that you can get 10% that way too.
3. Gas engines in cars in the USA are known as OTTO cycle engines. They should be modified to behave like an Atkinson cycle (also called Miller cycle), by leaving the intake valve open during part of the compression stroke to lower compression losses. This would only be applicable during certain RPM ranges and not 100% load. This could give you 5% increase in efficiency easily.
4. Cheap mild hybrid; Add a supercapacitor and have the alternator run at full load when the driver wants to brake and act as a motor when you want to accelerate. All that's physically added to the car is an alternator that can also be a motor, a super capacitor if needed (Or just the stock lead acid battery) and computer software. Porsche and Mazda are doing that to their regular gas cars now for 2013.
5. Start/stop technology. The car should stop the engine when you are stopped and start when the computer senses that the brake pedal is releasing at full speed or when released fully if released slowly. 5% better city probably.
For this car specifically, they should really look at Ford's Turbo 3-cylinder Eco engine, Toyota should put something like this in the IQ (with the 5 features above) and then we could see the highway MPGs go up into the 40s and city up there too.
I read on the Scion website that they have "Direct Ignition", which doesn't sound any different than any other gas car with the placement of the spark plugs.
There are a few critical things that can be done differently to the engines in the USA today, Scion, Honda, GM everyone should have the following features in their car;
1. Direct Injection into the cylinder instead of multiport fuel injection, 5-10% increase in efficiency there.
2. Get rid of transmissions with torque converters (traditional automatics) and put in CVTs, dual dry clutch automatics and traditional manual transmissions. Not suprising that you can get 10% that way too.
3. Gas engines in cars in the USA are known as OTTO cycle engines. They should be modified to behave like an Atkinson cycle (also called Miller cycle), by leaving the intake valve open during part of the compression stroke to lower compression losses. This would only be applicable during certain RPM ranges and not 100% load. This could give you 5% increase in efficiency easily.
4. Cheap mild hybrid; Add a supercapacitor and have the alternator run at full load when the driver wants to brake and act as a motor when you want to accelerate. All that's physically added to the car is an alternator that can also be a motor, a super capacitor if needed (Or just the stock lead acid battery) and computer software. Porsche and Mazda are doing that to their regular gas cars now for 2013.
5. Start/stop technology. The car should stop the engine when you are stopped and start when the computer senses that the brake pedal is releasing at full speed or when released fully if released slowly. 5% better city probably.
For this car specifically, they should really look at Ford's Turbo 3-cylinder Eco engine, Toyota should put something like this in the IQ (with the 5 features above) and then we could see the highway MPGs go up into the 40s and city up there too.