EFI Mapping Questions....
avos at cochlear.com.au
avos at cochlear.com.au
Fri May 23 02:48:08 GMT 1997
I have a question regarding the altering of EFI parameters from a
factory Management computer. My car is a Subaru and I brought it with
an after-market EFI chip installed by the previous owner. The chip was
designed in Australia. I had a bit of a think about how to design such
a chip, and came to the conclusion that modication of my chip would
only be feasible for a small company if the chip was a standard PROM
and the people who developed my chip simply down-loaded the data from
the factory chip, worked out how the data effected the paramters of
the management computer, and modified the data for new parameters, and
then burnt a new compatible PROM with the data. Is this a way that
aftermarket chips can be made?
If this is the case and the aftermarket chip is simply a PROM, than I
should be able to download the data from this aftermarket chip into a
file and edit it, and burn a new chip. The main question I have is how
do I find information on the PROM memory map? Is it likely that the
makers of my aftermarket chip worked out how it worked by trial and
error, or would they have had a manual which explained the memory map
of the chip. Is it common for car manufacturers to give such
information to the general public. If so where would I be able to get
it for a Subaru Liberty RS Turbo.
I have recently found out that another maker o EFI chips in Australia
is making a chip which alters the factory boost level in the chip (The
boost level on my car is controlled by the computer). I am currently
making my own boost controller, but I can't help but wonder about the
option of modifying my boost level in a reliable electronic method by
such a simple thing as changing the PROM. This would be far cheaper
than any other method I know of (including the standard boost bleed
mechanical method), but would retain reliable/accurate boost levels
achieved by after-market electronic boost controllers as it is
essentially an electrinic boost controller intergrated in the factory
management computer.
I am not interested in changing fueling parameter currently as I don't
know enough to do this, and could easily damage my engine. Currently I
am only interested in altering the Boost level.
Before anyone asks, I don't know what type of computer Subaru uses,
but If anyone would car to tell me I would like to know......
Thanks in advance for any information on this subject. I would have to
assume that some people on this list have modified factory map
settings before...
Adrian
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