[Diy_efi] Re: Minimalist micro based EFI ?

[Mike]

Yes yes, I udnerstand thats an output issue and a convenience
setting for a *MAP* sensor but, I was talking MAF and 'Mos' must
have assumed I was talking MAP <sigh>,

So, back to MAF, and from what I have seen of the extent Bosch
went to with a thick film circuit, I guss 8 bits is not enough
for MAF given the log output and 10 bits is also unlikely
to be enough, so more like 12-14 bits would seem a compromise  ?

rgds

mike




At 09:06 AM 3/11/03 -0600, you wrote:
>5V/1bar would be the 'standard' for a 1bar MAP sensor, a gm 3bar does
5V/3bar.... seems most MAP sensors max out at 5V, pressure capability
depends on how it's made... i.e., honda map will do in excess of 1 bar, but
not quite 2 bar, and maxes out at 5V (but the honda ecu doesn't know what
to do when the voltage from the MAP sensor exceeds approx. 3V, which is
where 1 bar is on those sensors)
>
>-----Original Message-----
From: Mike [mailto:erazmus at iinet.net.au]
>Sent: Tuesday, March 11, 2003 9:00 AM
>To: List for general do-it-yourself EFI talk
>Subject: RE: [Diy_efi] Re: Minimalist micro based EFI ?
>
>
>At 01:38 AM 3/12/03 +1100, you wrote:
>>> <cough> I dont see how boost has anything to do with the number of bits.
>>
>>Your 5V range has to take into account a higher pressure range, hence more
>>bits will take you closer to your original 5V/1bar resolution.
>
>Huh, what has 1bar got to do with 5v, sounds like an arbitrary
>selection - why does it have to be that way - is it some 'standard' ?
>
>Surely any aftermarket read modified read diy doesnt necessarily
>'know' this 5v/1bar ratio, I've seen people put huge AFM's on
>cars that do 18psi, did they skip the 5v/1bar 'standard' ?
>
>So now you are saying air flow voltage is related to boost pressure
>rather intimately ?
>
>
>Rgds
>
>Mike Massen
>Mb +61 (0) 438 048961
>Perth, Western Australia
>Some power/auto stuff here:-  http://www.iinet.net.au/~erazmus
>Some auto stuff http://members.iinet.net.au/~erazmus/car_accessories/
>
>
>
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