Alfred Lord Tenniscourt
Active member
I got the truck started on the megasquirt yesterday, but it is in need of some serious tuning. The megasquirt defaults seemed to have the timing advanced super far (the lowest advance on the table is 26 degrees!), and it seemed to be running a little rich, but it ran.
I have begun what looks to be a pretty long process of tuning, and it would be really helpful if I had a better starting point. Has anyone got their 300 to run well on megasquirt? If you have, can I have a copy of your msq to play with.
I am running a 300 with the batch fire FI tin off a 94 F-150 (except the dizzy, which is an old duraspark VR unit), punched .30 over with a very mild cam.
Also, I haven't seen a usable signal from the one wire O2 sensor I installed. I haven't driven the truck yet, so it may be that it hasn't gotten hot enough to begin operating, but I expected to see something from it. Does anyone have any advice on this? I would really like to have the O2 sensor up and running before I start putting the engine under a load so that I can get the mixture close quickly.
ALso, the PWM valve seems to be stuck open no matter what I do with the settings in megatune, has anyone had any problems with this? I have 12v going to one side of the PWM, and the ground is coming back through pin 30 to the megasquirt where the circuit should be opened and closed by the transistor I wired in place of Q4 (if I am understanding everything correctly). I unplugged the PWM, and the engine died, so I am pretty sure the PWM is not simply stuck. If anyone knows anything else about this, or has a slick way of testing the circuit, I would sure like to hear it...
Thanks,
ALT
I have begun what looks to be a pretty long process of tuning, and it would be really helpful if I had a better starting point. Has anyone got their 300 to run well on megasquirt? If you have, can I have a copy of your msq to play with.
I am running a 300 with the batch fire FI tin off a 94 F-150 (except the dizzy, which is an old duraspark VR unit), punched .30 over with a very mild cam.
Also, I haven't seen a usable signal from the one wire O2 sensor I installed. I haven't driven the truck yet, so it may be that it hasn't gotten hot enough to begin operating, but I expected to see something from it. Does anyone have any advice on this? I would really like to have the O2 sensor up and running before I start putting the engine under a load so that I can get the mixture close quickly.
ALso, the PWM valve seems to be stuck open no matter what I do with the settings in megatune, has anyone had any problems with this? I have 12v going to one side of the PWM, and the ground is coming back through pin 30 to the megasquirt where the circuit should be opened and closed by the transistor I wired in place of Q4 (if I am understanding everything correctly). I unplugged the PWM, and the engine died, so I am pretty sure the PWM is not simply stuck. If anyone knows anything else about this, or has a slick way of testing the circuit, I would sure like to hear it...
Thanks,
ALT