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For the LC-1, just run the 0-5v output from there through a resistor (I think I used ~400 ohms ) before connecting to the MS.
You don't need the TPS for anything except maybe fuel cut and idle advance... Accel enrichment can be done using MAP.
you need the whole lm1815 circuit for the G signal on the CAS, and 3 4.7K resistors for the pullups on the LEDs to run ignition.
Fuel pressure regulator is up to you, I've always used one. I would size the injectors so that 1) The stock primaries are used, and larger secondaries are added, 2) total duty cycle is 80% or below. I don't know off the top of my head what size the injectors should be.
Do you have a reason for keeping the stock primaries? if say, 720s were used in the primaries, couldnt the extra just be taken out of the fuel map to account? How does megatune account for the secondaries coming online? is it at a set RPM, and then fuel flow is split between the two sets?
4x720's should do the trick if you wish to go that route. If you upgrade secondaries only, you'll need something like 1000 or larger. Most seem to go with those modified Ford 1600's since they're inexpensive. Both options will work, but smaller primaries give better control at idle. This advantage is less significant if running hi-res code, or MS2.
Check the documentation for a full description of staged injection operation.
as renns says, my reason for suggesting smaller (stock) primaries was to make it easier to control idle and low-load behavior.
ms2/extra does not yet support rotary trailing (although ms2/extra, which is still in alpha, supports staged injection with microsecond resolution, and I've started on the rotary trailing code). The hires code would help you if you wanted to run the larger primaries, but even then, it's easier to control low load and idle AFRs with smaller primaries.
Ok, that makes sense, I was thinking about it to make a smooth transition from primaries to primaries and secondaries and back. 550's and 1600's seems like quite a split, and i wasnt sure how they would be controlled across the transition to avoid stumbling or hesitation. Do you think that this would be a problem?
Thanks for the site btw, thats a cool little script. 550's and 1600's definately leave room to grow, hopefully there wont be a problem in there.