[Diy_efi] Speed-density vs. MAF/MAP...

[Bill SHURVINTON]

Um Perry VE>100% by definition says that you have inertial supercharging so
MAP >atmo. So you can still sense it if you are timed sampling.

As for MAF on motorbikes I have yet to see a workable MAF solution that
works with IR systems and teeny throttled volumes without screwing up the
throttle response. Not to say it can't be done, but seems pointless. No, is
pointless :-)


Bill
----- Original Message -----
From: "Perry Harrington" <pedward at apsoft.com>
>
> Speed density is based on the air pressure in the intake
> being the same as the pressure on the back of the intake
> valve.  Once you hit atmospheric, which usually happens
> at 100%VE, you have run out of that component.  Thus
> it merely becomes a table where you are reading RPM and
> looking up a fueling amount for that RPM.
>
> With Alpha-N, you at least have a second component when
> the MAP runs out of resolution.
>



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