Help please – this is a bump of an older thread with new information. We are trying to make a MS3-Pro work on a Honda VTEC AP1 engine. In our earlier threads we were attempting to us the RC51 setting. After upgrading to the latest firmware and comparing the manual changes, we discovered that the RC51 was targeted on the bike version and not the inline 4. As such, the RC51 setting, when scoped, looks like it is expecting an odd fire engine.
Moving on from this configuration, we attempted to run the engine as a 12 + 1. That is, we have a 12 tooth Crank wheel (perfect signal) and cut two lobes off the CAM wheel to create a single tooth CAM. We degreed the CAM wheel and gave it a try. As shown in the attached files, we get a good, even crank signal, but the CAM signal is all over the place. Any thoughts?
Specs:
Vehicle: Honda Vtec AP1 4cyl engine.
Crank sensor: Stock – VR
CAM sensor: Modified Stock – VR
Two lobes of the cam wheel removed leaving the center lobe. Machine work is high quality with no stubs to cause false signals.
Honda VTEC AP1 CAM sync issue
Moderators: jsmcortina, muythaibxr
Re: Honda VTEC AP1 CAM sync issue
SUCCESS! An update on the progress.
For whatever reason, the Honda VR sensors are jittery on this engine - even with the overall shield. To fix the S2000 AP1 triggering we made the following changes:
1) Could not get RC51 to work with stock CAM/CRANK setup - maybe RC51 is hard coded to odd fire?
Solution: cut off 2 of the cam trigger lobes. We cut the side lobes and left the center lobe so there was enough time for the computer to process.
Set firmware to "toothed wheel = 12" and "Dual wheel"
Set CAM angle to 90 degrees and then fine tune with a rimming light. (Set fixed timing to t 5 Degrees
2) Installed a 330ohm resister across the signal / signal return (ground) wires for BOTH Crank and CAM VR sensors.
This worked like a charm. Now to get a good tune...
For whatever reason, the Honda VR sensors are jittery on this engine - even with the overall shield. To fix the S2000 AP1 triggering we made the following changes:
1) Could not get RC51 to work with stock CAM/CRANK setup - maybe RC51 is hard coded to odd fire?
Solution: cut off 2 of the cam trigger lobes. We cut the side lobes and left the center lobe so there was enough time for the computer to process.
Set firmware to "toothed wheel = 12" and "Dual wheel"
Set CAM angle to 90 degrees and then fine tune with a rimming light. (Set fixed timing to t 5 Degrees
2) Installed a 330ohm resister across the signal / signal return (ground) wires for BOTH Crank and CAM VR sensors.
This worked like a charm. Now to get a good tune...