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Old 02-04-2022, 10:14 PM   #15
Evansa22
 
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I've heard the window for injection is between exhaust valve closing and intake valve opening, is this correct? Same source says 5* before e.v.c. to account for computer latency is close to ideal. So you'd be looking at aeound 352.8. Just my guess
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Old 02-05-2022, 07:02 AM   #16
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I've heard the window for injection is between exhaust valve closing and intake valve opening, is this correct? Same source says 5* before e.v.c. to account for computer latency is close to ideal. So you'd be looking at aeound 352.8. Just my guess
Window of injection is between EVC/IVO (depending on overlap of cam) and IVC. That said, your start of injection can typically start 5* before IVO for the reason you described. Spring isn’t far away so I’m looking forward to documenting the SOI impact on power with some dyno time in the near future.
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Old 02-05-2022, 06:36 PM   #17
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Sweet! Like to see new data added to the mix
Guess I had gotten it mixed up because I didn't think it made sense to stop at IVO but thought that is what it said. Thanks for the info
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Old 02-05-2022, 08:05 PM   #18
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Sweet! Like to see new data added to the mix
Guess I had gotten it mixed up because I didn't think it made sense to stop at IVO but thought that is what it said. Thanks for the info
Yeah, it needs from approx 5 degrees before IVO to 5 degrees before ignition. Thatís your window and why we keep IPW under ~6 ms or so.
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Old 02-08-2022, 09:55 AM   #19
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Yeah, it needs from approx 5 degrees before IVO to 5 degrees before ignition. That’s your window and why we keep IPW under ~6 ms or so.
True but advancing SOI allows for longer IPW's. For example, My brother's C7Z seems to tolerate IPW's up to 7.5ms before things start to get wacky. Now I didn't leave it that way of course, but it seems custom cams with advanced SOI can tolerate longer pulse widths. First thing I notice when fueling goes south is the wideband will start to show rich when it's really not. Bring the IPW's down and the AFR reading will show leaner even though the engine really richened up. What you are seeing is wasted fuel going out the exhaust causing a false rich reading. Also can cause "fuel knock". My car with stock cam doesn't like anything over 6.5ms. And if you leave the SOI stock values you could likely start to see some issues above 5.8-6.0ms.

SOI main purpose is to get the fuel injected on time for complete combustion. I do believe there are some gains in power to be had but it's not huge. Interested in your results this coming Spring.
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