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Old 06-16-2014, 01:11 PM   #1
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Default Trackspeed 12+1 trigger wheel + VVT pulse pattern

I'll park this here for posterity

Crank trigger wheel same as a Honda K20 (not same positioning though)
Crank trigger wheel has 12+1 teeth. Rising edge significant
- 12 regular teeth 30 apart
- one of the teeth are aligned to 10 BTDC #1/4
The extra (+1) tooth is at approx 30 ATDC #2/3
- This is ~10 after the regular tooth at 20 ATDC #2/#3

Intake cam trigger wheel
3 teeth; 2 are very close, and the 3rd is on the opposite side.
The trailing tooth of the double tooth is 180* from the single tooth

Sequence: (no matter what VVT angle)
TDC firing #1
single cam pulse
TDC firing #3
extra (+1) crank tooth
TDC firing #4
double cam pulse
TDC firing #2
extra (+1) crank tooth

cam rising edge locations at full retard:
80 ATDC #1 firing (single pulse)
40 ATDC #4 firing (leading pulse of double pulse)
80 ATDC #4 firing (2nd pulse of double pulse)

VVT max advance is 48
As intake cam sweeps through phase range, the extra (+1) crank tooth never "crosses over" a cam rising edge
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Old 06-16-2014, 01:13 PM   #2
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Now the million dollar question is if you can you set all that up in Megasquirt?
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Old 06-16-2014, 04:37 PM   #3
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Nope.
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Old 06-16-2014, 05:43 PM   #4
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It could be custom coded, though.
The last time I looked at the source code, it gave me aids.
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Old 06-17-2014, 02:57 AM   #5
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Custom-coded in the firmware, yes. Supported through the generic wheel mode, no.
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Old 07-06-2015, 07:28 PM   #6
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Thanks Jason, just what I was looking for.
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