Mass airflow sensors.

[Andrew Brownsword]

Heh, I hope I'm that sharp.  But I'm a software guy, so I'd prefer a
software solution and building a PIC isn't something I want to get into if I
can help it.  The ECU has the right number of inputs as it is, and has nice
calibrated RPM, IAT, TPS, and Baro readings.  If I get a set of voltage vs.
airflow readings for the MAF I'm going to use, then I can start from there
and tune the new table I'll put in place of the VAF table.  Plenty of room
for that, and the code is trivial (uses existing subroutines).  A full
pressure vs. RPM map would want to be pretty big and would take longer to
tune... I'd guess that I have room for about a 15x10 entry map of 1 byte
entries, and that doesn't seem like enough.

Yeah, its going to take work... but that the whole point of a project car,
isn't it?

Thanks,
   Andrew


-----Original Message-----
From: nacelp <nacelp at bright.net>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Wednesday, February 16, 2000 5:56 PM
Subject: Re: Mass airflow sensors.


>If your as sharp as you sound, I'd run a map sensor, and plot a bunch of
>points and compare them to the VAF.  Then use a pic to translate things, it
>would need a rpm input and IAT to get things right, and would be involved,
>but sounds like you have lots of work to do here, anyway to get this right.
>Grumpy
>      What kinda of signal does your TPS output?.
>      How many wires on your IAC?.
>
>> Whew.
>> So... now that I've given you the whole spiel, do you have any thoughts?
>Am
>> I completely insane, or is this just the kind of challenge you guys love.
>>   Andrew
> PS:  we've been around and around and around on getting the fueling on
this
>> car right, and this is the best direction we've got.  Aftermarket parts
>for
>> it are fairly rare, and a replacement ECU is very expensive and doesn't
>have
>> all the nice features of the stock ECU (i.e. emissions control and 1 O2
>> sensor feedback loop per bank of 3 cylinders).
>
>
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