[Diy_efi] AW11 MR2again

[Joe Lutz]

alpha is throttle position and n is engine speed.  Mapping n alpha means 
your main fuel and spark tables have axes of throttle position and engine 
speed instead of the usual manifold press and engine speed as when using a 
map sensor referenced to manifold.

Joe Lutz


From: "David" <d_cottrill at iprimus.com.au>
>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>To: <diy_efi at diy-efi.org>
>Subject: [Diy_efi] AW11 MR2again
>Date: Mon, 16 Jun 2003 01:10:06 +1000
>
>OK, the 4 AGZE is correct, but the supercharger algorithm is run off its
>own independent sensors (3) and the program for that is relatively
>simple (a few logic gates and its all good from there). This is also why
>I thought of mapping the injection to manifold air pressure, so it's
>still useful once the pressure becomes positive. The boost is currently
>up to 8 psi (12 psi sitting in the shed) and yes, that’s why I'm
>including the knock sensor on the list (its fitted as standard). I'm
>working on the fix-it option but the previous efforts have proved
>fruitless, including hacking the chip. The only option I haven't
>exhausted is taking the car to Neal Bates motorsport which is a toyota
>WRC race team (won a local road race in an identical car when they were
>new) who are also nice enough to work on any car with deep enough
>pockets.
>Doing my own ECU is likely to be the cheapest, if most difficult way of
>fixing the MR2 and it happens to be a field I'm interested in. Starting
>off with a background knowledge close to 0 means I want to start small,
>as small as possible and build on that. Once I have the postie bike
>working I may figure out how to make it work for the whole car at once,
>but for now the module idea has more pros than cons.
>For the hardware on the bike I'll be canniballising the throttle body,
>injector and maybe fuel pump off a cylinder for something in the 600cc
>range then making or buying a new inlet manifold with a an aftermarket
>foam air filter. For sensors I'm going to try to use 4AG sensors
>wherever possible so there's less screwing around recalibrating things
>later.
>
>What is alpha n?
>
>Also thanks to everyone for your help so far, 36 hours has been more
>helpful than asking random mechanics for a week. I now have an idea of
>what I'm up against and what to check when shopping for bits.
>
>
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