730 Pump Shot

[Squash]

How drastic were your changes?  I was in the middle of figuring this out when my truck got a
little injury, so AE tuning had to stop.  I'd like to help figure it out.

Squash 

--- timsiford at hushmail.com wrote:
> >AE can be a very slippery slope, and alot varies by combo., now with 
> >that said, usually best to tamper with it very little if at all possible,
> 
> Believe me ... I would prefer not to mess with it ... but, my modifications 
> demand it.  The MiniRam coupled with a bigger TB and higher flow ducting 
> necessitates an increased pump shot.  I was able to get rid of an off-idle 
> to WOT stumble by increasing the pump shot.  Thus, it can be very useful 
> on cars that have seriously diverted from the original GM engine for which 
> the BIN was designed.
> 
> >The AE mulitpliers are TPS, MAP, and for CTS.
> >They are all used in the general fuel calulation.  Where all the fueling 
> >is multiplied out for figuring the total injector on time.
> 
> Yes.  I know this.  But , again, can anyone explain the AE table (% Diff. 
> TPS vs. Mult) for the 730 ECM as given in the anht_hac.pdf?  That is all 
> I am trying to figure out and it seems that nobody really knows.
> 
> My experimentation has shown that increasing the values in the table increases 
> the pump shot.  Although I have found this to be true I still don't understand 
> the actual table format...
> Why does 0% TPS have a 1.0 (or 100%) multiplier and 50% TPS have only a 
> 0.25 (or 25% multiplier).  A greater %TPS difference requires more pump 
> shot.  So, why is the multiplier SMALLER?  How can a 0% TPS have a 100% 
> Multiplier?!?
> 
> Tim
> 
> >Bruce
> >
> >
> >> >From 90% TPS to 100% just takes a small fraction of AE compared to
> >> >20-30%.
> >
> >> Bruce, that makes sense.  But, what I don't understand is why at 0% 
> >TPS
> >> has a multiplier is 100.0 and 50% Differential TPS has a multiplier 
> >of
> >only
> >> 25.0 [insert confused look here].  That makes zero sense to me.  Opening
> >> the throttle 50% needs a much bigger pump shot as compared to not 
> >opening
> >> the throttle at all (0%).  Yet 0% has a mult of 100 and 50% has a 
> >mult of
> >> 25.  Again - I think that I am missing something really simple here 
> >that
> >> one comment may bring to light.
> >> Is Differential TPS = the delta between two throttle openings? i.e. 
> >idle-
> >> >WOT = 0%-100% or 100% Differential TPS?
> >> Furthermore, what does the multiplier multiply?
> >> Tim
> >
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=====
Trains, Trucks, and EFI at http://www.trailrunners4x4.org/users/realsquash

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