Carpokes

Tom wrote: Fri Apr 11, 2025 5:09 pm Curious why your speed sensor voltages are so low? That's below the factory spec. With a .5mm gap, I see multiples of that at 200rpm? The latest generation VR trigger chips (i.e., the MAX992x) have adaptive trigger modes that I played around with at one point. They seem to work very well -- no idea which stand-alones are or are not offering that though... MaxxECU is so new, however, I wouldn't be surprised if it used the latest and has an automatic trigger mode (although you may still need to configure the box to use it...).

I guess the question for 944m3 is: did the car run ok on the original DME, or did you have a no-crank then too? That would help determine if you have a bad sensor signal or if the stand-alone just isn't configured correctly yet. If it ran on the DME, it should run on the stand-alone. As SirLapsalot says, if you have a screen shot of the sensor signals on a scope, that should pretty much tell you one way or another if the signals are the root cause or not. Not a whole lot of grey area when it comes to those signals. Maybe post up the scope shots if you have them.

SirLapsalot wrote: Fri Apr 11, 2025 5:16 pm

Tom wrote: Fri Apr 11, 2025 5:09 pm Curious why your speed sensor voltages are so low? That's below the factory spec. With a .5mm gap, I see multiples of that at 200rpm? The latest generation VR trigger chips (i.e., the MAX992x) have adaptive trigger modes that I played around with at one point. They seem to work very well -- no idea which stand-alones are or are not offering that though... MaxxECU is so new, however, I wouldn't be surprised if it used the latest and has an automatic trigger mode (although you may still need to configure the box to use it...).

I guess the question for 944m3 is: did the car run ok on the original DME, or did you have a no-crank then too? That would help determine if you have a bad sensor signal or if the stand-alone just isn't configured correctly yet. If it ran on the DME, it should run on the stand-alone. As SirLapsalot says, if you have a screen shot of the sensor signals on a scope, that should pretty much tell you one way or another if the signals are the root cause or not. Not a whole lot of grey area when it comes to those signals. Maybe post up the scope shots if you have them.

I couldn’t say for sure! I did forget to mention though that I am using whatever VR sensor Clewett supplies with their kit. So I would assume maybe thats where the bulk of the difference may lie.

944m3 wrote: Fri Apr 11, 2025 11:26 am

chris white wrote: Fri Apr 11, 2025 10:40 am my 'official' way of gapping the crank sensor for my front mount set up is 3 layers of masking tape on the face of the sensor and set it up touching the trigger wheel. The tape is usually brushed off as soon as you start but even if that doesn’t happen it doesn’t interfere with the signal. Should be about .4mm

Sounds like a good method, makes sense.

Seems blue paint edging tape should work, correct?

944m3 wrote: Fri Apr 11, 2025 5:35 pm Going to need some time to digest that lol but great info.

I’ve added a picture of what I’m seeing. To be crystal clear, I have no idea what I’m doing and I’ve hadn’t had time to troubleshoot. I’ve literally spent half an hour or less with the ECU. So I don’t know if I’m graphing the right thing. I do want to study up so that I know what to ask.