Tip for MPG Tuning
09-21-2011, 11:19 AM
#1
Tip for MPG Tuning
The way you can change MPG if by changing the AirFlow.
If you decrease airflow at a given Speed you will increase MPG. If you increase horse power you will need less throttle angle to maintain given speed and this will mean less airflow. This is related to Means best Timing or Torque.
Compression ratio has an effect on how efficient gas burns.
to be continued
If you decrease airflow at a given Speed you will increase MPG. If you increase horse power you will need less throttle angle to maintain given speed and this will mean less airflow. This is related to Means best Timing or Torque.
Compression ratio has an effect on how efficient gas burns.
to be continued
09-23-2011, 02:49 PM
#5
Do you mean to say decrease horsepower? Airflow is almost directly proportional to horsepower. Increasing torque at a given throttle angle would net better mileage...same reason why diesels can get such good mileage and still weigh 8000 pounds. More torque at less RPM = less horsepower = less fuel consumed.
09-23-2011, 02:57 PM
#6
Do you mean to say decrease horsepower? Airflow is almost directly proportional to horsepower. Increasing torque at a given throttle angle would net better mileage...same reason why diesels can get such good mileage and still weigh 8000 pounds. More torque at less RPM = less horsepower = less fuel consumed.
Increasing horse power is the only true way to increase MPG!
09-23-2011, 03:07 PM
#7
Whe horse power is increased at a given RPM the engine will need less airflow and fuel flow is 100% dirrectly related to the airflow.
Say you have real gas and an AFR of 14.68 to 1. That is the target that the engine is trying to reach. If you are flowing 10 g/sec at cruise. You hook up your trailer and boat. You will increase air flow to maintian the same given vehicle speed. This will decrease MPG. It take more HP.
I didn't say using the HP.
Pull out 10 deg of timing at cruise RPM and lower your HP and tell me if your MPG goes up or down
Say you have real gas and an AFR of 14.68 to 1. That is the target that the engine is trying to reach. If you are flowing 10 g/sec at cruise. You hook up your trailer and boat. You will increase air flow to maintian the same given vehicle speed. This will decrease MPG. It take more HP.
I didn't say using the HP.
Pull out 10 deg of timing at cruise RPM and lower your HP and tell me if your MPG goes up or down
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09-23-2011, 03:18 PM
#8
I suppose I just word it differently lol. I think we're saying the same thing...hold RPM constant, increase timing to increase torque, then close the throttle slightly to decrease airflow so you're not using all of that horsepower potential. Then you can shift to a higher gear with the added torque, etc.
09-23-2011, 03:40 PM
#10
What about PE? should it be delayed or no delay?
If PE is delayed you may think this will increase over all MPG, but for the most part it will not. If you set PE to come in very early then you will be flowing less air over a given distance
If PE is delayed you may think this will increase over all MPG, but for the most part it will not. If you set PE to come in very early then you will be flowing less air over a given distance