injdata-lowpwvariance
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injdata-lowpwvariance [2011/12/15 05:54] twdorris |
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| ====== Injector Data - Low PW Variance ====== | ====== Injector Data - Low PW Variance ====== | ||
| Fuel flow rate through an injector is affected by a number of different things. This page focuses on the fact that even with nicely matched sets down to 2ms (0.002 seconds) pulsewidths, there can still be significant differences in your typical operating range. | Fuel flow rate through an injector is affected by a number of different things. This page focuses on the fact that even with nicely matched sets down to 2ms (0.002 seconds) pulsewidths, there can still be significant differences in your typical operating range. | ||
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| The problem is that you may very well be spending a lot of time below that range. And having injectors that are matched well in that range means little about the behavior outside it. | The problem is that you may very well be spending a lot of time below that range. And having injectors that are matched well in that range means little about the behavior outside it. | ||
| - | For example, on a set of 1450 cc/min injectors running on gasoline with a 2.0L 4-cylinder engine, you'd expect to idle in the 1.6-1.7 ms range. And as you can see in the next section, the behavior of any given injector down in that range can be very different from the behavior in the 2ms range. It doesn't sound like much of a difference, but it can be as much as a 30-50% difference in some areas. That's huge! That's like having one cylinder running at 14.7:1 and another running at 9:1 with the same pulsewidth. | + | For example, on a set of 1450 cc/min injectors running on gasoline with a 2.0L 4-cylinder engine, you'd expect to idle in the 1.6-1.7 ms range. And as you can see in the next section, the behavior of any given injector down in that range can be very different from the behavior in the 2ms range. It doesn't sound like much of a difference, but it can be as much as a 30-50% difference in some areas. That's huge! That's like having one cylinder running at 14.7:1 and another running at 9:1 with the __same__ pulsewidth. |
injdata-lowpwvariance.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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