re: 730 Pump Shot

[Bob Valentine <bob@tecmark.com>]

My understanding of the vac-referenced FPR was that it compensates for the
effect of vacuum at idle on the output side of the injectors.     In other
words, when you don't have zero vacuum (WOT), the vacuum in the intake
actually helps to pull fuel out of the injectors; decreasing the fuel
pressure compensates for this.

TBI doesn't have a referenced FPR since the output side of the injector is
never exposed to intake vacuum.   

-> Bob

At 08:43 AM 10/13/2000 -0500, you 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
----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org