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"So just ignore the MAP signal, and run it alpha-N. ("Alpha" meaning throttle angle, "N" meaning RPM.)"
Yeah, I said as much. Alpha-N setups tend to be more finicky, and you typically end up with things like flat spots when doing unusual things like starting from a stop heading up a steep hill (not so unusual in SF, pretty unusual in Iowa).
MS also doesn't do Alpha-N out of the box. I believe there's some code floating around to get it to work, but reprogramming the microcontroller isn't for everyone. The TPS signal in the stock MS code is only used for acceleration enrichment and open-loop selection. Most people who resort to Alpha-N are doing so because they simply can't get a reliable MAP signal, such as running a very wild cam in a race engine. Some of the EFI motorcycle setups (and compared to cars, all bikes have really wild cams, and all have individual throttle bodies) will use both. Alpha N below a set engine speed, then speed-density (revs and MAP) above that, when the signal as typically stabilized.
As for needing to use Toyota injectors, the stock 2.0 D-Jet injectors are 380cc/min, which is HUGE, good enough for something like 250hp. If anything, using smaller injectors will aid in tuning, esp. at idle.
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