[Diy_efi] new EFI controller

Greg Hermann bearbvd at mindspring.com
Mon Mar 10 20:47:33 GMT 2003


At 2:59 PM 3/10/03, Toyota Supra wrote:
>the problem with the sizing of the injector theory, and the duty cycle
>theory, is that it sounds like you are assuming that the person would be
>using your setup as a stand alone, instead of a piggy back, which would not
>be the case in my case.
>
>with the GPO's, i think my suggestions still stand as what would be the
>best, to have it being able to be used for as many possibilities, as
>possible. the more applications it can suit, the more units you could sell!

If you are building an ecu using a 565/566 processor, why in the name of
heaven use it as anything BUT a stand alone ?? It would only have , maybe,
100---1000 times the processing power of the oem ecu !!

This kind of an ecu is NOT for those afraid to re-do a harness !!

Greg
>
>any thoughts on approximate cost? could you build a special unit to
>accomodate my setup?
>
>-j
>
>
>
>
>
>
>
>>From: bearbvd at mindspring.com (Greg Hermann)
>>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 11:33:53 -0700
>>
>>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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