[Diy_efi] Bosch Air Flow Meter info please

[Bobby Riggs]

Think of a TPS as Throttle angle, well this flow
meter is more like Flap Angle (FPS?).  The wiper
inside basically gives a varied voltage based on
posistion.  Why would you want to replace the
ECU? Contrary to popular belief (from carb guys)
they are extremely reliable and I've never seen,
nor confirmed a dead analog Bosch ECU.  If worse
comes to worse, get a 'new' one out of a '76 and
later VW Transporter (bus).  80/81 is when they
had extra smog stuff that can be deleted.  Its
almost identical to any Porsche L-Jet (I don't
believe there is ANY differences).  These ECU's
are like the grandfather of the calculator :) 
Garbage in, garbage out.  You can 'tune' them
easier than ANY other ECU (opioniated belief of
course).
-Bobby

--- AnalogWz at aol.com wrote:
> It looks like the DC voltage output of these
> mechanical vane meters (The pot 
> wiper) may be a linear function of air flow; Is
> this true? What is the 
> function of the resistor from the top of the
> pot to the ECU? One end may 
> connect to the battery and the resistor pot
> junction appears to be a 
> regulated 6.8 VDC (Maybe a Zener in the ECU).  
> I'm trying to make a plug-in replacement ECU
> for a, no longer available, 
> Bosch L-Jetronic analog ECU.
> Thanks, 
> Jim
> 


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