EPROM tuning head start

[Ludis Langens]

WEG1192 at aol.com wrote:
> 
> Now, is there a way to
> correlate the amount the BLM is away from 128 to the amount needed to adjust
> the VE vs. RPM vs. MAP table?

AdjustFuel = UnadjustedFuel * (BLM / 128)

The VE would need to be changed by the same ratio.  Keep in mind though
that the VE is often the sum of values from two different tables.

> What about mapping the dist curve of the stock Jeep distributor with a timing
> light, tach, and vacuum gauge and vacuum pump as a way to get the spark table
> in the ballpark? Is the vacuum and mechanical advance in a stock distributor
> pretty close to "perfect" or way off usually compared to an EFI tuned vehicle?

The advance from the non-computer distributor will be way off compared
to what a computer would generate.  A few points may match, but the
computer is able to have a much more complex advance function.  The
mechanical dizzy must be set for the worst case, while the computer can
include a lot more information in the advance calculation.

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

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