Does anyone know where to get output specs for the normal

engine

sensors?  I've looked at the SAE site with no luck (it was

difficult to

navigate so it might be there I just couldn't find it.)  I

would like to

build another EFIS (common goal nowadays?) and need to know

what the

output is from these sensors.  I refer to coolant temp, mass

air flow,

oil pressure, and etc.

Not much time so short answer:  Forget about all the stock

sensors and toss

them in the trash.  All the EIS units out there will require

different

sensors. Get the recomended parts from the EIS maker.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

That's just it, Tracy.  *I* am be the EFIS maker 8-).  My goal is
moderate precision, but repeatability within 2 sigma.  Cheap is the

very

important operative word, here.  The computer alone looks as if it

will

be about $800, and I do all the programming.  That leaves only $400
budget for everything else, and $400 for the screen.  In my Ford

engine

conversion (gasp, yes I know that is heresy for this list, but I

already

have it and the Blanton PSRU.  The rotary is my long term backup

plan),

all the sensors are already in place from the factory, so tapping

into

them shouldn't be difficult.  I hope.  I have a scope to put on

them,

but was hoping to find out in advance which if any are frequency
signals, voltages, pulses, or what have you; and of course min and

max

ranges.  Scoping all that out on the ground will take forever and

might

be misleading compared to values seen in flight stresses.

Thanks,
AI Nut

One more comment,  Are you intending to use the mass airflow sensor too?
Only reason to do so is if using the stock ECU.  If rolling your own EFI,
consider using a speed - density system with manifold absolute pressure
sensor instead.  Saves a LOT of weight & space and is more reliable to boot.

Tracy

 
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