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Old 02-27-2016, 02:48 PM   #1 (permalink)
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Default Timing dip around 5500, then adding back

Excuse my ignorance, I am still finding my way with tuning. I noticed that in many ignition maps, the timing increases until around 5500 RPM where it dips sharply before being increased up until redline.

Can someone explain this concept to me? Why dip at this particular point before adding timing back?
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Old 02-27-2016, 04:59 PM   #2 (permalink)
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VTEC does weird things to engines.
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Old 02-27-2016, 05:39 PM   #3 (permalink)
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Sure, but I'm talking about the non-VTEC maps. Take the NG63 ROM for example:



I've seen other TE maps that show similar dips at the same datapoint. Just curious.
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Old 02-27-2016, 07:48 PM   #4 (permalink)
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Usually a sign of where max VE lives for that engine. It's a pretty well documented trait.
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Old 02-27-2016, 07:57 PM   #5 (permalink)
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Quote:
Originally Posted by spAdam View Post
Usually a sign of where max VE lives for that engine. It's a pretty well documented trait.
Thank you, this is the kind of answer I was looking for. I need to research volumetric efficient apparently.

If you can provide any additional pointers, I'd appreciate it. Not looking to get spoon fed but I definitely want to learn.

Why reduce and then re-add timing?
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Last edited by Paterico; 02-27-2016 at 08:00 PM.
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Old 02-27-2016, 08:59 PM   #6 (permalink)
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Eh . . . No.

Peak VE on most 4 cylinders is much lower than that. However, that is typically around where a peak torque occurs. And . . . From my own dyno tuning on non-VTEC engines, that dip doesn't belong there at all.
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