730 Pump Shot

[timsiford at hushmail.com]

>How much does the FP change?  5 psi? 

Apples to oranges ... depends on how much vacuum your current setup pulls 
at idle.  Example - swapping the 218/224 cam into my car caused the vacuum 
to change to 50-55kpa at idle.  Thus, the vacuum difference between WOT 
and idle is now much smaller as compared to the stock setup.  Mine changes 
about 4psi from an idle to WOT and about 7psi from an off idle cruise to 
WOT (because I am pulling more vacuum cruising at particular rpms.
  
> I don't know as if that is enough to make
>much difference in AE, especially when this table seems to counteract 
>it.  It's almost like the
>table *removes* AE that is naturally there from the FP change.

5psi fuel pressure can change the AE significantly.

Tim


>--- timsiford at hushmail.com wrote:
>> >Obviously, more fuel pressure causes more fuel to be sprayed by the
>> >injectors. Maybe that's why the pump shot table has decreasing values
>> >as the %TPS increases.
>>
>> Nick,
>> Great hypothesis!  Finally, ... a proposed reason that explains the 
>730
>> pump shot table.  Does anyone else have any comments on this hypothesis?
>>  Seems very plausible to me.
>>
>> Tim
>
>
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