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

100 increments of 1%

Matt,

Changing the tach output to every 180 deg on your 2 cylinder would require a code change which would not be trivial because a tach pulse is now done every tach cycle, and would have to be done twice as often. You might see if msextra code handles this.

Mike,

The ecu can distinguish ...

When I scope the tach output using your msq I see a tach output every 360 deg, and I see IGN1 and IGN2 outputs every 720 deg, but this generates a spark every 360 deg, although because the engine is odd-fire, the spacing is not even. But the tachout signal is evenly spaced every 360 deg. And that is ...

There are 2 effects of choosing the Map/Baro option:

The load index used for interpolating in the VE, spark and afr target tables is Map x 100/ Baro instead of Map.

In the pulsewidth equation, the fueling is multiplied by (Map/ 100 kPa) instead of by (MAP/ Baro).

So for most cases, where there ...

If you are seeing the correct rpm on the TS gauge, but the Tacho output is not following this, then there may be a bug in the code. If you post your msq I will test it out.

That would make re-start even faster as the ecu would know exactly where it was as long as power wasn't lost. If you kill power you could still save where you were for the next cold start if you had the right type of memory, but there would be no way of knowing whether someone turned the engine over ...

The purpose of prime_delay is to let the pump prime for people who have bad check valves. So the ecu delays prime_delay seconds to allow the pump to prime, then squirts the prime pulse. The code you are referring to is just to keep the ecu from turning off the pump before it has primed.

Assuming ...

With efi the only way to get the car started as fast as a carb is to have different missing tooth patterns, for example 1 missing tooth and 180 deg later 2 missing teeth. That could get you started within half a rev instead of one. But you also have to deal with wasted spark. If the first cylinder ...

Yes the Racepak can in theory act as a GPIO device and request data from the ecu or tell the ecu it has data to send it. In both cases it has to tell the ecu from what memory location to send requested data or where to put the data the Racepak is going to send. In both cases it also has to tell the ...

The 2.920 code is closer to what you have and the initial design for this series was for for engines without trigger wheels. While trigger wheels were added, the design is not as efficient as the 3.x series, which was designed for full sequential engines.

Since you are upgrading, and intend to use ...