Turbo V6 Tuniing continued

[Ludis Langens]

TK wrote:
> 
> The seem to use the BPW vs EGR at 0% flow as the injector constant.
> The SD's that have the injector constant use it for some other stream.
> 
> Ludis, does the Fiero use the injector flow constant?
> 
> When I tuned the 749 for the Fiero, I changed the %0 EGR flow.

There is no seperate "injector constant".  The closest thing is the BPW
vs EGR table.  This table is only used when EGR is enabled.  It is
possible to be enabled but with 0% EGR.  When EGR is disabled, a
seperate byte in the PROM is used.  The value in this byte should match
the 0% EGR table value.

> > > The SyTy tables *do* have a setting for Gal/Hr on the injectors, but
> > > apparently the code never references it, so its value is immaterial.

This may be left over from the Fiero '7170 ECM.  This ECM has an ALDL
mode where data for a fuel economy gauge is transmitted.  Two of the
bytes in the data packet are constants that aren't used elsewhere in the
PROM.  I suppose one of them is a conversion constant to convert
cumulative injector on time to fuel consumption.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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