injdata-lowpwvariance
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injdata-lowpwvariance [2011/12/15 05:54] twdorris |
injdata-lowpwvariance [2011/12/15 05:55] twdorris |
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| 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. | ||
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| ===== Data ===== | ===== Data ===== | ||
| - | As an example, here's a chart collected from a set of FIC BM1450s. Notice how the set is very well matched above 2ms. But also notice how different one injector behaves below that point. The problem is that your typical idle (assuming gasoline and 2.0L, 4-cylinder engine) starts around 30 cc/min on this chart. Cruise would be around 60 cc/min. | + | As an example, here's a chart collected from a set of FIC BM1450s. Notice how the set is very well matched above 2ms. But also notice how different one injector behaves below that point. The problem is that your typical idle (assuming gasoline and a 2.0L, 4-cylinder engine) starts around 30 cc/min on this chart. Cruise would be around 60 cc/min. |
| |{{lowpwvariance.png?300|Low PW Variance}}| | |{{lowpwvariance.png?300|Low PW Variance}}| | ||
injdata-lowpwvariance.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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