The Ultimate Guide to EFI, Part 5 – beginning the fit-out

Cars are made up of thousands, or even tens of thousands, of individual pieces and this is true whether they were made last year or 50 years ago. So, when you pull one apart and start re-engineering it in an ad-hoc manner (like I have) this turns out to be a complex job that takes an age to complete.


I started the fit-out of my EFI set-up by bolting on the bottom pulley with the Holley 58-tooth (60-2) trigger wheel mounted to it, in preparation for making a custom mount so I can fit the crank angle sensor. This sensor reads the missing two teeth on the trigger wheel so the ECU can see how fast the motor is spinning and it gives it a reference point to know Top-Dead Centre (TDC) on cylinder #1.


To start, I had to pull my intake apart so it made it easier to fit, and then rip off one rocker cover so I could ensure everything lined up nicely. I have discovered the fuel rail mounts I made don’t line up nicely so I will have to remake them and get them powdercoated again.


I fitted the alternator but forgot to bring the power steering bracket with me, as the PS bracket mounts the bottom of the alternator. I also need to extend the power wire for the alternator as it is currently too tight. 


If you want to learn more about the F.A.S.T air-only throttle bodies I’m using check out THIS LINK back to Part 1 of my Ultimate Guide to EFI.


The IACV maintains engine RPM, preventing the motor from flaming out when the throttle plates snap shut. The GM LS1 IACV supplied with the FAST #304154 throttle bodies has a stepper motor actuation, which the Haltech ECU can’t control so I will use a two-wire unit from a Ford Mustang.


From this point I need to still mount the LS1 coil packs, make some fuel lines to suit the Flex-Fuel sensor, run the computer wiring, mount the computer under the dash… then I also have to wire injectors, coils, spark plug leads, wire all the sensors on the throttle bodies, mount and wire the Idle Air Control Valve, and make a throttle linkage…


I ended up mounting the coil packs on the firewall, as you can see in the below photo. They’re wired in banks of four to weather-proof Deutsch connector pins, and will run in wasted spark configuration (firing 2 coils per-ignition).

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