Tag Info

Hot answers tagged

5

Yes, gear ratios are the second largest influence on your fuel consumption. Number one being maladjusted timing. I always relay the story of my and my wife's cars: she has a 1.4 Opel Corsa and I have a 2.0 Turbo Coupe. While my car has more than twice the power of hers and weighs 350kg more, we get about the same consumption figures (she gets 12.5km/l and I ...


3

How much worse is the fuel usage you are experiencing? Have you talked to any other owners to see if you are getting way below their mileage? How did your last car perform compared to listed fuel mileage ratings? In the U.S., the government posts the results of required fuel mileage tests. Most of the people I have talked to do not get the same fuel mileage ...


3

I think that the computer's fuel consumption statistics don't actually come from the tank float. The consumption estimate comes from the injector duty cycle and fuel pressure. The computer probably has a map or graph between duty cycle and fuel pressure which tells how much fuel the injector will spray at any given cycle and pressure. Using this it ...


3

Canadian fuel economy tests are rather optimistic, especially the highway numbers which only use relatively low speeds. The highest speed in the highway test is 97kph, but the speed limit on twin lane roads is 110kph. The latter speed requires about 1.45x as much power (power to overcome air resistance is proportional to the cube of velocity) to maintain. ...


2

It is possible to reach those figures, but you'll have to drive like an old lady and also stay mostly in top gear. You'll also need to coast your car as often as possible which is simply engaging the clutch when you go downhill. It's not practical, but those figures are attainable if you don't mind irritating everyone behind you in the process.


2

Great question. I am making an educated guess here, so don't quote me in court;) Because piggyback chips interfere with your car's various inputs I would assume that you are correct and that your MPG score will be inaccurate as a result. I can't say by how much though. These chips usually give an MPG boost of around 10%, so I would imagine your true MPG ...


2

As you are traveling on flat land and transition to an uphill slope, whether you (the driver) realizes it or not, you must press the accelerator down further in order to maintain speed (or engine RPM). The vehicle control systems recognizes this and pushes more fuel into the system to compensate. This gives you more power to make it up the hill. If the grade ...


1

I'm not really familiar with your car, specifically, but I'm ready to speculate based on general knowledge of fuel injection. Electronic Fuel Injection or EFI uses 'closed loop air/fuel ratio control'. What this means is that it has a way to 'see' how completely the oxygen has been used up by the fuel delivered. If there's too much fuel, there will be no ...


1

Apparently there's one more thing you can check to see if you're engine is consuming too much, and that is the composition of the exhaust gas. I took my engine to a dyno before swapping it for a 2JZ ('cuz hey, if I'm gonna the 2JZ mileage anyways, might as well get power) and they told me the engine was getting more fuel than it should. Apparently the ...


1

Consider that your gas tank has a reserve reservoir, which is not measured by the float in the tank and also that you can overfill your tank by putting fuel in the chute(or whatever it's called). The most accurate test you can do, is to fill up your tank as completely as possible and then drive around until your car stutters to a halt because your tank is ...



Only top voted, non community-wiki answers of a minimum length are eligible