Bosch MAF for VAF swap

[bjanesi at juno.com]

Hi Alex-

Thanks for the response.  Although I have a basic understanding of
electronics, I'm not an electrical design engineer, so this is probably a
bit over my head.  Tying the MAF output to the O2 sensor output does
sound interesting though, but what about cold start-up when running open
loop?  I guess there would have to be a default setting for open loop.

I know the Split Second Co. has a control box with 3 different pots; I
believe one sets the base idle, one sets mid-range, and the 3rd sets
voltage at maximum air-flow.  Fine tuning is done primarily via
observation of an O2 sensor meter, so it is a manual approach to what it
sounds like you have done automatically with the adaptive feedback.
 
Any chance you have a schematic on any of this?  Any info would be
appreciated.

Thanks again,

Brad (brad.anesi at netiq.com <--- use this address if sending attachments)

----------------------------------------------------
Date: Sat, 11 Sep 1999 09:27:41 +0000
From: "Alex C. Peper" <xxalexx at popd.ix.netcom.com>
Subject: Re: Volvo/Saab Bosch MAF swap for VAF

I made some controllers for Bosch Hot Wire and Bosch Vane with PIC 73
Used built in 8 bit converter and 10 bit PWM output direct 
connection on hot wire.( used voltage divider and opamp on 10 V.
vane meter.)  Was used as O2 sensor adaptive feed back control,
with 12 point internal correction table.  Also had prototype to load
EEPROM values and rpm input. 
You could look into adjustable gain opamps and DAC's
Alex
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