MAP and TPS LOAD based EFI

[Gabe]

You mean like the Electromotive Blend software?

I believe it only applies to vehicles that don't produce much vacuum at low
RPMs.  I have this setup on my Vette, when not applied the MAP reading is very
high and unstable in the low RPMs.  When I apply the TPS blending, which tapers
off as the RPMs rise, the KPA value lowers to a more "normal" level and smooths
out dramatically.  What it is actually doing is just averaging a percentage of
the voltage from the TPS with the MAP to fake the ECM into thinking it's getting
a stable signal from the MAP, so it shouldn't interfere with your 3d table, as
the signal appears to only be coming from the MAP.

Gabe

Nicholas Parker wrote:

> Hi,
>        How are TPS & MAP combined to form the 'LOAD" estimating variable in
> some EFI systems?   Does this techinque only apply to cars where the
> camshafts have overlap resulting in low vacuum (as in closer to atmospheric
> pressure than absolute vacuum!) at low engine speeds?  What is a good way of
> implementing this kind of control?  How do you implement this when you have
> a 3d RPM vs MAP table for you basic fuel 'calculation' ? Why would you want
> as well I guess!?
>
> Cheers, Nick Parker.
>
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