Road Tuning: Making Coarse Adjustments
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Making Coarse Adjustments
02.42
| 00:00 | Since we have already coarsely adjusted both the fuel and base ignition timing, we know these parameters should be close enough to let the engine start in idle. |
| 00:09 | As discussed previously, we'll need to revisit these settings once the engine is running, but for now we don't need to worry. |
| 00:16 | Since we have already set the ignition timing conservatively, there's no chance we'll have any detonation in the idle areas we'll be tuning so you can go ahead and forget about the ignition side of the mapping for now. |
| 00:29 | Keeping your engine running at this point may require you to use the throttle to prevent stalling. |
| 00:36 | Until the engine is a little more tuned, and the idle parameters are configured, there's a pretty good chance that if you take your foot off the throttle the engine might die. |
| 00:45 | This isn't a concern and you want to use enough throttle to hold the engine rpm around the 1,000 to 1,500 rpm area while you're making your initial adjustments. |
| 00:56 | The fuel side of the mapping is probably going to need some attention, and this is the area we need to concentrate on during our initial startup. |
| 01:05 | We want to make sure that our engine isn't running too rich or too lean, although at this early point the mixture window we want to aim for is pretty wide. |
| 01:15 | I like to see the engine run with a lambda value somewhere in the range of zero point eight five through to zero point nine five. |
| 01:24 | To achieve this we need an easy way to make quick coarse adjustments to our fuel map. |
| 01:30 | How we can go about this will depend on the particular ECU. |
| 01:34 | You can either use an overall fuel trim feature, adjust the master injector pulse width number, or simply make changes to the table values. |
| 01:45 | To affect an across-the-board change, I'll normally start by selecting a large block of the fuel table that incorporates the area the engine is running in and then add or subtract from the block until the mixture matches my target. |
| 01:58 | We aren't trying to be exact here. |
| 02:00 | That will come later. |
| 02:01 | For now we just want to get the engine running cleanly so we can complete the configuration and setup. |
| 02:08 | If you struggle to get the engine to initially fire up and run, you may also need to use these techniques to increase the fuelling everywhere to get the engine started. |
| 02:18 | Remember while you're making these changes that the engine will be warming up. |
| 02:23 | The background compensations for startup and warm-up enrichment will also be active from the background so you can expect to see the mixture changing as the engine warms up. |
| 02:33 | Don't worry about this right now, but keep making adjustments if necessary to keep the mixture correct. |
