Dave (Old School EFI) is working on this for me:
My 1984 Fiero Indy Pace Car with SD4 (Super Duty 4-cylinder) race engine.
This SD4 engine originally ran dual Weber side-draft carbs in race trim before being transplanted into the Fiero
(but was never run in the car - installation was never completed by previous 2 owners).
When I got the car, the engine was rebuilt and detuned (C.R. was 13.5:1 - now 10.5:1) we went with a 4-bbl carb on Edelbrock 4-bbl manifold. I never could get it working quite right. Transitions from cruise to WOT always had a bog in there we couldn't tune out. Cold starts were OK, but you couldn't drive until it warmed up a bit and it also got horrible gas mileage.
I installed a FAST EZ-EFI - a fuel only system designed to replace a 4-bbl carb (you retain your weights/springs/vacuum distributor for ignition). While the hardware seemed to work great, the "self-tuning" fell flat on its face with this engine. It was over-fueling the engine for some reason.
I wasted the entire summer following up the diagnosis from FAST's technicians:
1. must be installed wrong
2. must have an exhaust leak
3. must be "interference" (your car is haunted)
After eliminating all possible problems and an ocilloscope diagnosis of all signals came up clean,
it became apparent I had a case of "there's nothing wrong - but it just won't work right".
I gave up on their ECU and went the DIY route. I kept only the FAST EZ-EFI throttle body, built a new wiring harness and installed a 8192 baud Delco 1227165 ECM with an NVRAM module from pcmhackers.net to run the car. This slick combination gives you the ability to Flash BINs, Real-Time Emulation and Tuning with TunerPro RT directly through the ALDL port. I also added a knock sensor and switched back to an ECM controlled ignition system on the engine.
I started with a modded $12P BIN for Camaro 350 TPI w/SD - changed parameters to 4-cylinders and fuel to suit the 2-injector setup.
It started on the second crank - and ran not bad! Proof of concept confirmed!
Thankfully, Dave is working on the fine-tuning of the $12P BIN for 7165 ECM with NVRAM right now.
I was able to put this together, but the TunerPro learning curve is like a steep vertical cliff for me.
It's ongoing, but getting better with each BIN I flash into the ECM.