# EMU Classic RB25DET Neo cam sync issue

**URL:** <https://community.ecumaster.com/t/emu-classic-rb25det-neo-cam-sync-issue/4394>\
**Category:** EMU BLACK / CLASSIC\
**Created:** [September 15, 2025, 6:47am UTC](https://community.ecumaster.com/t/emu-classic-rb25det-neo-cam-sync-issue/4394 "2025-09-15T06:47:14Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Barboocha](https://avatars.discourse-cdn.com/v4/letter/b/7993a0/32.png) [@Barboocha](https://community.ecumaster.com/u/Barboocha)\
**Post date:** [September 15, 2025, 6:47am UTC](https://community.ecumaster.com/t/emu-classic-rb25det-neo-cam-sync-issue/4394/1 "2025-09-15T06:47:14Z")

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Hello!

I have RB25DET Neo with Ecu master classic. It worked fine with stock cas sensor. Then I installed on it aftermarket camshafts 264-9 and trigger kit, with crank and cam sensors, and I am experiencing some problems to start it up.

It starts only if i set ignition output offset to 3, which changes cylinder fire order from 1 5 3 6 4 2 to 6 4 2 1 5 3. In this case it works very poorly, on 500 rpm on half or 4 cylinders and cant rev more than 500-600 rpm. In all other ignition output offset settings(including 0) it don’t start at all.

- Crankshaft is 36-2 trigger disk, camshaft is 1 tooth.

- Timing in ECU and real timing on engine matches, set with strobe light. Here is primary and secondary settings in ECU: [https://drive.google.com/file/d/14c-QIyaqyzN8looAJ61oc0qU5j6sjx0d/view?usp=sharing](https://drive.google.com/file/d/14c-QIyaqyzN8looAJ61oc0qU5j6sjx0d/view?usp=sharing)

- As i read from emu manual, in case of 1 tooth cam trigger system, camshaft tooth determine engine cycle start.  
“A toothed wheel with the only 1 tooth that synchronize the engine cycle (cam sync). When using a multitooth primary trigger, the next tooth after camshaft tooth will have index 0. In the case of toothed wheel with missing / additional tooth the tooth 0 will be always after the gap (or additional tooth) and camshaft tooth will determine the engine cycle”  
So, if I understand it correct, tooth of camshaft trigger should occur on engine TDC on compression stroke(where is tooth gap on crank trigger disk), right? I moved cam sensor physically, so it matches to it tooth on TDC cylinder 1, but nothing changed, it still start very poorly only on ignition offset set to 3.

- Then I analyzed scope, and saw that cam sensor reading is not on the trigger gap, its much further. Changing trigger edge moved it even further away. Here is scope:

- 

I understood it right, that this is key problem, that engine phase start not where it should, and engine can’t start, because all work cycles are missed? How can I solve this problem, this is wrong ecu settings or mechanical issue? Maybe I understood something wrong in manual?

Thank you in advance, sorry for my english