305 vs. 350 TPI 730 EPROMs

[rr]

You have to be careful about just looking at the main tables. There are several
other
locations that come into play when dealing with the end timing. I'd try to find
a bin
that matches closer to your current engine.

BobR.


TRAX wrote:

> Why is it that the 305 has significantly more advance in the spark tables
> compared to the 350 (1991 F-Body 730 ECM)?  Could the use of the 305 spark
> tables in a PROM for a 350 produce excessive knock retard?
>
> I am asking because I have a friend who is experiencing significant knock
> retard in his 1991 Z-28 305TPI automatic.  This car has a transplanted 350
> (w/ 350 knock sensor).  Although the car has a custom PROM in order to work
> with his 19lb injectors, I have noted that the spark tables are basically
> the 305 tables.  Furthermore, he is still running the ESC filter that is
> attached to the 305 MemCal.  Is the ESC filter on the 305 MemCal tuned for
> the 305 engine?  Would he need to be running an ESC filter that was designed
> for a 350?  As a side note ... this car is not in need of fuel.  The O2
> values at WOT show > 920 mV across the board.  In fact - the car is actually
> running rich right now.
>
> Tim

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