Will the Adaptronic benefit from an 8-tooth trigger wheel? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-01-2010, 08:37 PM   #1
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Default Will the Adaptronic benefit from an 8-tooth trigger wheel?

..and get better timing resolution due to more frequent updates?

Will it benefit from a 4-tooth wheel with evenly spaced teeth as opposed to the 4 unevenly spaced teeth on the 99/00?

Can it be made to work with the above?
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Old 02-01-2010, 10:26 PM   #2
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You could use either as long as you have a reset pulse. Either from the CAS or a missing tooth. The install manual recommends using as many teeth as possible...

I think the uneven teeth might enable it to work without an external reset, similar to a missing tooth.
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Old 02-01-2010, 11:20 PM   #3
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The uneven teeth on the crank won't do that. It repeats every 180* crank degrees. You can't tell from it which way the crank is pointed.

In contrast, a missing tooth on the crank pattern would repeat only every 360* crank degrees.
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Old 02-02-2010, 12:08 AM   #4
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Quote:
Originally Posted by JasonC SBB View Post
The uneven teeth on the crank won't do that. It repeats every 180* crank degrees. You can't tell from it which way the crank is pointed.

In contrast, a missing tooth on the crank pattern would repeat only every 360* crank degrees.
How are they unevenly spaced?

If only 1 tooth is at an odd spacing it would only repeat once per 360*. You would get short-even-even-long or something like that, right?

I'm asking because I'm still trying to figure out the different methods for generating crank signals.

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Competition is good for the customers.
Unfortunately too many don't understand how competition has been stifled in health care which is why we have the sky high costs.
Huh?
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Old 02-02-2010, 02:51 AM   #5
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The teeth cadence is like this

1001000100100010010001

Get it? They are narrow pulses, 110* and 70* apart.

IOW they arrive at 10* and 80* BTDC of each cylinder. These tell you how far you are from each TDC, but you can't tell which of the four cylinders is coming.

A missing tooth OTOH would tell you which pair of cylinders is next.
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Old 02-02-2010, 03:19 AM   #6
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Got it, I can see how that pattern would be ambiguous.
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