Austin Healey Electronic Fuel Injection

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This paper discusses the final configuration of my Austin Healey 3000 MKII electronic fuel injection (EFI) project and some of the technical issues associated with this project.  One of the objectives of this installation was, to the extent possible, have the EFI system reasonably stealthy.....meaning that when you open the hood (bonnet) the casual observer would not notice anything glaringly high tech.  I am not an engineer, so if you have issues with the content, understand that I am sharing what I've learned with the single goal of documenting my experiences, if that shortens your learning curve...good.  If you know more than I do about the subject....great! 

 I need to give credit to my co-conspirator on this A.H. project.  The knowledge of how to put together the EFI system was solely dependent on Ric Navarro, of TBI Connection,  who in addition to knowing which components to use and how to do the computer tuning, also machined many of the custom pieces that were required.

                   

     

The question I get most often is how much more power is there with the EFI system.  Conventional wisdom seems to be that an EFI system will yield a HP increase of from 12-20% over a carbureted fuel delivery system on the same engine.  You can speculate on the relative merits of this EFI system over the old SU carbs......however the A.H. EFI system described here is more than just fuel delivery since it includes an entire ignition upgrade.  But, I'm taking the conservative approach guessing a 18% increase in the whole system....who knows.  More importantly, the engine cold starts better, has very quick throttle response and seems smoother throughout the rpm range.  Once it gets on the road it is expected to yield an improvement in fuel economy.  I've attached two pictures of the engine area.  The first during development, in this picture the engine is a full functioning EFI system....the second picture is functionally the same, but the engine has been rebuilt and cleaned up a bit.