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Q. Is there a simpler version of MegaSquirt® to only control extra injectors piggyback style?

A. You can use the standard MegaSquirt® EFI Controller to control extra injectors.
You wouldn't need to hook up the coolant temperature sensor, if you didn't want to, you would just set all the temperature dependent values to 100% (warm-up enrichments, cold accel enrich., etc.).
You don't need to hook up a TPS, you can just set all the accel enrichments to 0, and hook a resistor from the input pin (#22) to ground (otherwise the CPU will see a climbing value and go to 'flood clear mode'.)
You don't need to hook up an oxygen sensor, just set the EGO step size to 0%.
For the air temperature sensor, you would just hook a resistor across the pin (#20) where the sensor would normally connect. This resistor could have any value from the sensor curve (in the sensor section of the manual) to approximate whatever temperature you think appropriate, or you could use a potentiometer to tune the extra fuel with a single knob.
In theory, you could eliminate some components (mostly a few resistors) from the PCB if doing this, but they are generally so cheap as to not be worth the trouble of omitting.
Of course, you can retain any or all of the standard MegaSquirt® sensors to gain additional control and tunability over the extra injectors.

Forfatter:	Per MB [ 17 jan 2008, 19:11 ]
Titel:	MS som tilskudsystem ?
Pænt goddag Jeg er kommet i den situation at jeg har lovet en kammerat at fikse et benzin tilskudsystem til hans lille trykladnings projekt så jeg har kigget på forskellige løsninger: Der er jo MF2 men den er jeg selv ikke den store tilhænger af Og så er der jo MS som jeg selv synes er den bedste opfindelse siden den dybe tallerken... men så kommer det store spørgsmål : Da motoren er en mercedes med et mekanisk insprøjtnings anlæg kunne jeg godt tænke mig at vide om MS ville kunne bruges som tilskuds system med et par ekstra dyser i indsugningen ? Jeg ikke magter at skulle til at lave helt nyt plenum med dyser , fuelrail og osv Mener jeg så en tråd på powerpage om dette emne men har ikke været så heldig at finde den.. /Per

Forfatter:	xillur [ 18 jan 2008, 10:00 ]
Titel:
Det kan sagtens spille som tilskud og det spiller rigtig godt. Jeg har rodet med det på en bimmer med kompressor. Du skal bruge en lufttemp føler og signal fra f.eks tændspole til omdr. Kølevandssensor behøves ikke, jeg satte bare et potmeter på og trimmede den så ms troede motoren altid var ved drifttemp. ved cranking skal systemet ikke gi benzin, det klarer det org sprøjt. Men du skal alligevel sætte pulsewidth til det mindste = 0.1mSek, da der er en bug i den del af koden.

Forfatter:	ae86 [ 18 jan 2008, 12:35 ]
Titel:
http://www.megasquirt.info/MS%20FAQ.htm skrev: Q. Is there a simpler version of MegaSquirt® to only control extra injectors piggyback style? A. You can use the standard MegaSquirt® EFI Controller to control extra injectors. You wouldn't need to hook up the coolant temperature sensor, if you didn't want to, you would just set all the temperature dependent values to 100% (warm-up enrichments, cold accel enrich., etc.). You don't need to hook up a TPS, you can just set all the accel enrichments to 0, and hook a resistor from the input pin (#22) to ground (otherwise the CPU will see a climbing value and go to 'flood clear mode'.) You don't need to hook up an oxygen sensor, just set the EGO step size to 0%. For the air temperature sensor, you would just hook a resistor across the pin (#20) where the sensor would normally connect. This resistor could have any value from the sensor curve (in the sensor section of the manual) to approximate whatever temperature you think appropriate, or you could use a potentiometer to tune the extra fuel with a single knob. In theory, you could eliminate some components (mostly a few resistors) from the PCB if doing this, but they are generally so cheap as to not be worth the trouble of omitting. Of course, you can retain any or all of the standard MegaSquirt® sensors to gain additional control and tunability over the extra injectors.

Forfatter:	Per MB [ 18 jan 2008, 13:01 ]
Titel:
ahh mange tak for det

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