[Diy_efi] Magesquirt vs D- jetronic

[Tomlinson, Brandon B.]

Can you datalog with megasquirt? 



-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Tomas J. Sokorai Sch.
Sent: Thursday, April 21, 2005 10:33 AM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Magesquirt vs D- jetronic

On Thursday 21 April 2005 08:47, spati wrote:
>
> Is the Megesquirt based on the same things ??
>

Yes, and no.
It's load sensing is based on intake vacuum, so it is like D-jetronic,
but it 
is light years more advanced.
D-jetronic was a very crude analog injection system. No microcontroller
that 
calculated the fueling strategy, just a couple of transistors and
discrete 
components (very few transistors, BTW, as at the time D-jetronic was 
designed, transistors were not particularily cheap)
Megasquirt is digital, and calculates mathematically the amount of fuel 
injected based on RPM, intake vacuum, throttle butterflies position,
RPM, 
engine temperature, intake air temperature and even corrects the
calculation 
taking into account the barometric pressure.
And that's only the open loop strategy, as Megasquirt has also the
capability 
to trim the amount of fuel based on the actual combustion results of the

engine, using feedback from an exhaust oxygen sensor (normal or
wideband).

-- 
Tomas J. Sokorai Sch.
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