# Camshaft as Primary Trigger

**URL:** <https://community.ecumaster.com/t/camshaft-as-primary-trigger/4829>\
**Category:** GENERAL\
**Created:** [November 30, 2025, 9:11pm UTC](https://community.ecumaster.com/t/camshaft-as-primary-trigger/4829 "2025-11-30T21:11:20Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Mikel21](https://avatars.discourse-cdn.com/v4/letter/m/3ec8ea/32.png) [@Mikel21](https://community.ecumaster.com/u/Mikel21)\
**Post date:** [November 30, 2025, 9:11pm UTC](https://community.ecumaster.com/t/camshaft-as-primary-trigger/4829/1 "2025-11-30T21:11:20Z")

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Hello,

is it possible to use the Camshaft as the primary trigger?

With these settings? “CAM toothed wheel…” in the primary trigger settings

Regards

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**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [November 30, 2025, 11:41pm UTC](https://community.ecumaster.com/t/camshaft-as-primary-trigger/4829/2 "2025-11-30T23:41:49Z")

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Yes, this is how many oem trigger systems are setup including Nissan SR20, RB, Mazda BP, KLDE, Honda D/B series. So long as it has enough trigger teeth to be accurate enough.

Having separate crank and cam position sensors is always preferred.

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<div class="post-metadata">

**Author:** ![Mikel21](https://avatars.discourse-cdn.com/v4/letter/m/3ec8ea/32.png) [@Mikel21](https://community.ecumaster.com/u/Mikel21)\
**Post date:** [December 5, 2025, 10:34am UTC](https://community.ecumaster.com/t/camshaft-as-primary-trigger/4829/3 "2025-12-05T10:34:13Z")

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Thanks, what settings would you use if the trigger wheel on the camshaft has 4 teeth and 4 gaps, evenly spaced?

All the injectors are set to injector 1, and the ignition coil is set to coil 1.

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<div class="post-metadata">

**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [December 6, 2025, 6:57am UTC](https://community.ecumaster.com/t/camshaft-as-primary-trigger/4829/4 "2025-12-06T06:57:40Z")

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there needs to be some reference marker or ‘home’ so the ECU can understand where to start counting teeth.

I think you’re using a more distributor based ignition trigger, you’ll need to modify the wheel. 4 teeth is really not good for resolution, I’d say at minimum you want 12 teeth. Wheel diameter can determine how many teeth you can fit. Cylinder count also play’s a factor, stick to 12, 24 or 36 teeth.