Road Tuning: Steady State Fuel Tuning
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Steady State Fuel Tuning
01.39
| 00:00 | - Now that the engine is idling correctly and we're confident that everything is in good order it's time to go for a drive and we can begin the actual tuning process. |
| 00:09 | We start with what is called steady state tuning where we're aiming to hold the engine at a fixed rpm and load and then tune the individual cells in the fuel map. |
| 00:18 | This is the most accurate way of tuning an engine, as it lets us ensure the tune is correct at every combination of load and rpm. |
| 00:26 | If you do this properly, you'll end up with an engine that makes great power and torque, is smooth and responsive and offers great fuel economy. |
| 00:34 | While this is easy to do on a load bearing dyno, doing it on the road is a little harder. |
| 00:40 | For simplicity, we're going to break steady state tuning down into fuel and ignition tuning, since when you're learning, it's best to concentrate on one task at a time. |
| 00:50 | There is a belief held by some tuners that changing the ignition timing will alter the air fuel ratio and hence the two to be tuned simultaneously. |
| 00:59 | We can dispel this theory by simply looking at what's happening during the engine cycle. |
| 01:04 | The fuel is introduced to the cylinder before the intake valve closes, and by the time the intake valve is closed, the ratio of fuel and air in the cylinder is set. |
| 01:15 | The ignition event doesn't happen until much later and can't have any effect on the air fuel ratio. |
| 01:22 | Once you have become more proficient at tuning you will tend to swap backwards and forwards between the fuel and ignition tables and tune them simultaneously. |
| 01:31 | But save this for once you're a bit more familiar with the process and comfortable with road tuning. |
