MicroSquirt.com read only forum (Jan.15,2018)

They are now ready - see http://www.microsquirt.com/viewtopic.php?f=87&t=23934

One question of Jean's which got lost in what became a liscensing discussion was the question regarding the tach inputs on the new v3 microsquirt.

I have a product (Jean actually did the boards) which is a microsquirt module based ECU replacement. It would at times (in non standard installs we allow flexibility for) benefit from the new tach input, as would the projects of others. Is there any plans to update the module with the new tach input?

I have purchased on the order of 50 modules from you guys for this particular project, and will likely purchase 100 more before demand is met. If no plans exist to incorporate these changes into the module, then I completely understand, but would welcome them if they do.

We are considering this change as it makes sense, especially if there is a demand for it. However, even though the Max chip is a big improvement, there are a few cases where the old circuit works better, so this could affect existing plugnplay designs that might require some changes to get the Max chip to work. So we would want to start out offering both the old and new modules and give dealers time to test that the new module will work on their existing designs.

I aplogize for sounding ignorant, but what types of arrangements are better with the old circuit? I have only used one new gen microsquirt, and it was installed on a setup that would resemble being connected to an ignition coil (although cleaner). I recieved rpm input from an MSD tach output, and did not have a single sync loss with the Opto input. Granted, this was dyno only, but it was a solid 6-7 hours on dyno.

I don't think it is predictable which ones won't work out of the box, but I believe DIY Autotune had a problem with a bmw trigger wheel of a certain year and this required changing a resistor value externally. There may have been others.

Thank you. I will ask them about that install specifically.

grippo wrote:I don't think it is predictable which ones won't work out of the box, but I believe DIY Autotune had a problem with a bmw trigger wheel of a certain year and this required changing a resistor value externally. There may have been others.

Yes, it appears many 60-2 wheels with VR sensors require a 5K to 10K resistor installed in parallel with the sensor. The particular one we tried was a BMW M20 motor.

Matt Cramer wrote:

grippo wrote:I don't think it is predictable which ones won't work out of the box, but I believe DIY Autotune had a problem with a bmw trigger wheel of a certain year and this required changing a resistor value externally. There may have been others.

Yes, it appears many 60-2 wheels with VR sensors require a 5K to 10K resistor installed in parallel with the sensor. The particular one we tried was a BMW M20 motor.

I am mistaken, or is this not also common practice with the "standard" vr circuits used previously? Just to confirm, this is with the new v3 mircrosquirt?

Older ones put the resistor in series instead of parallel.