[Diy_efi] Re: Minimalist micro based EFI ?

[Eck, Joel (Houston)]

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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