[Diy_efi] new EFI controller

[Greg Hermann]

At 11:53 AM 3/10/03, Toyota Supra wrote:
>although tps is not super crucial in the additional injection, the rpm (as
>well as boost) would be ... reason being, is that if i want the injectors to
>turn on at a certain rpm, or boost, i can set either, or set values based on
>either, since it will make 15 pounds of boost at 4500rpms in 2nd gear, but
>15 pounds at 3300 in 5th gear

You can accomplish essentially the SAME thing by turning on the secondary
injectors based on duty cycle of the primaries, or based on some internally
calculated engine load calculation. Far simpler to do it either of these
ways in the software than to do a separate calculation.

The _REALLY_  nice_ arrangement is to size the primary injectors at about
1/2 the flow capacity of the secondaries. (In other words, size the
injectors so as to get 1/3 of full power fuel flow from the primaries and
2/3 from the secondaries.) Turn the secondaries ON and the primaries OFF
when you get to about 75 or 80% duty cycle on the primaries, then turn the
primaries back ON (leaving the secondaries ON) when you get up to enough
load to reach 75 or 80% duty cycle on the secondaries. You will get _MUCH_
more accurate fuel metering this way, from idle through cruise all the way
to the top end.

Greg
>
>as for the general purpose outputs, that is to give the user the ultimate in
>adjustability for miscellaneous items, the tps would be important there
>
>let me know what you think, any guesses on approximate cost?
>
>-j
>
>
>
>
>>From: "Bevan Weiss" <kaizen__ at hotmail.com>
>>Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>>To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
>>Subject: Re: [Diy_efi] new EFI controller
>>Date: Mon, 10 Mar 2003 15:58:34 +1300
>>
>>Couple questions...
>> > the ability to controll additional injectors, based on a 3d map of
>>boost,
>> > rpm and tps
>>
>>Why does boost/rpm/tps matter if you're just controlling additional
>>injectors.
>>btw, I'm thinking 8 injector outputs, for 8cylinder cars.
>>6 cylinder cars can just leave 2 channels out, 12 cylinder cars can just
>>leave two channels out and operate in batch mode.
>>4 cylinders ofcourse would then get 8 injectors, ie 2 per cylinder.  Which
>>would be perfect for injector staging, which would again be perfect for
>>turbo'd applications.  Performance 4's are normally turbo'd /supercharged
>>anyway.
>>
>>I'm thinking more along the lines of, calculate how much fuel is needed
>>based on MAP/MAF (maybe both if it's advantageous).  Then inject that
>>amount
>>of fuel.  I don't see why anything else is important.
>>Fueling will be done based on:
>>last cycle rpm, last cycle delta rpm, MAP/MAF, TPS, Temp(s)...
>>
>> > 10 general purpose outputs, with completely customizable 3d fields,
>>based
>>on
>> > boost, rpm and tps
>>
>>I'm still not sure why boost/rpm/tps is important for this...
>>I'm hoping that several outputs will be left free for such use as shift
>>lights etc, however these aren't required in the design and would only be
>>added value.
>>
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