So I bought a used "brain-built" Megasquirt standalone, and I've run into a few issues in my install.
Here are some pictures for perspective, so you can see what I am referring to.
MS - Imgur
92 NA, with a tdO4 greddy-Frankenstein kit, begi 2.5'' downpipe, 2.5" test-back, big intercooler, 315cc Supra Green-top Injectors, Walbro 190 Fuel Pump, MTX-L wideband.
MS Specific: I am using both the STOCK AFM and the STOCK TPS. (I will be getting an IAT/TPS I know...)
The MS appears to be ready for shift light & EBC, but that's about all I really know about this board.
I do not have an EBC, so I don't use the exposed grn/white wire, and I'm unsure about the "relay" brown wire, or the yellow unknown wire (coolant down side). I've pulled the TPS, removed SIGN fuse, wired my WBo2 to the pink wire pictured, double-checked guides for editing a basemap (incl injector options), and managed to get the car to start!
Currently, it starts but barely holds idle..its rough and my AFRs are super lean (~20+). If I touch the throttle the rpms dip, it almost dies, and then it kind of "catches up" for a second. The radiator fan also seems to kick on immediately following start-up (I've uploaded easytherm data for stock AFM(iat) and CLT) It behaves like it is only running on a few cylinders. I've downloaded a base-map for similar setup, and double checked the settings to make sure they match, and I have adjusted timing/injector size for my vehicle.
I've got WBo2 readings, Clt, Air, RPM and MAP/bar on TS Dashboard. They even appear ~accurate.
Plugging my stock ECU back in completely fixes any issues, so I know I didn't fry anything on the car
I'm not sure if I need to be re-wiring anything additional, changing software/tune, or fixing something broken. I've been staring at a wiring diagram for the MS, but the point of buying it built was to avoid this process, although I am growing impatient enough to tackle it.
Do I need to ground anything on the MS since I have the stock TPS? I've unplugged it and I've got mixed advice coming in. Also, I am not sure if I need to calibrate the TPS with it removed (dumb concept) but a few values seem to rely on TPS. I've got acceleration on MAPdot in TS.
(I also have a Cartech RRFPR installed, the last of my bandaids. It keeps my afrs down when I need to use stock ECU to drive between working on the MS. Could this be the culprit? It will be removed anyway, but I've heard of people keeping them on)