PSIG wrote: ↑
Mon Jun 17, 2019 3:15 am
Now that's a cool thermistor. -40 to 572°F!
Anyway, for others tracking this, there are more useful references for use of that sensor under the "Other Related Documents" on this page
. Another popular choice for CHT compatible with Speeduino include the little Bosch 0 280 130 012 or 022-906-041 as used on VW air-cooled engines, inexpensive, short 10x1mm straight threads (easy to tap) and easy to calibrate. Lots of options!
I have been looking at the sensors that you referenced, "still trying to figure out the Bias Value on the one I got, or I am not entering the correct resistance." any way my reading are coming up on the tuner gauge page, are not quite there to say the least.
I went with a themistor that read up to 300 Celsius or 550 , because on this motor, others have posted that the temperature reading under the spark plug runs around 450 degrees. when loaded
this is kind of high when looking at head temps on other motors, but even the manufacture specs call for head temps that high..
at idle i have been reading with an IR gun 230 to 300 degrees on the fins. next to the spark plugs.
so far in looking at the other options, I haven't found the data sheets to let me know what their max temp is.
as far posting a tune, " I think I may have swallowed a dumb pill, every time I copy and paste, it tells me that the data did not transfer. hopefully today I will get with some of the younger generation, to show me the error of my ways..
the other problem that I will face in tuning it at the moment, is this little motor will be going on an mini airboat, and I am still a little ways out on building the redrive, so I don't have any way to put a load on the motor,
at least I am assuming that without a method to load up the motor, tuning beyond an idle would be rather difficult.
changed the injectors over to semi-sequential, and it all is working great, "found out a couple of things what you meant about good connections. "
one of the wires coming from the speeduino to the injector has some corrosion inside, and that answers why one injector was reading weak. changed the wire out and it is working great.
also when I reinstalled the din connector back on the speeduino board, I lost the crank signal, and the stepper motor.
took a couple of minutes to get that figured out. good connections are important.
all in all, I am having fun studying up and learning about the tuning phase,
thanks again for the suggestions on what to be looking at. I did use my powerprobe to verify the injectors are working, and all 4 are pretty consistent at idle