EFI project has started Options

[mb911]

Just a quick update. MFI to EFI bungs are in and will be using the carbs will just be throttle bodies and port injection.

Have at those questions

[technicalninja]

You will need to check the map signal you get off of that block.

All ITB F.I. setups that I have played with required a TPS sensor as we had to run Alpha N below 12-1500 rpm as the map signal looks like an ignition signal at slow speeds.

This FI strategy is called blended alpha N/speed density.

More compression and big cam profiles made this MAP instability worse.

Most systems that I have worked on have 6 and 8 cylinders.

The more cylinders you have the smoother the MAP is at low speed.

You might be able to run an IAC valve (idle air control) off the block. I usually go with 3/16-1/4" vacuum lines from each runner to gain enough flow for computer controlled idle aspects.

Below the smooth signal threshold, the map sensor is not in use, but the IAC valve is, and above the threshold vise-versus.
I will commonly run the MAP off of one end of the block and the IAC off the other.

Another solution is to enclose both air filters in plenums and add MAF sensors in the entrance to the plenums, but you will significantly reduce the howl that we all love to hear from an ITB set up.


4 cylinder info next. I'm not researching 6 cylinder stuff yet.

I saw the Jenvey Heritage ITB for the 4 cylinders that hide the injectors and the TPS inside the unit. The injectors are firing into the intake just below the throttle blades at an angle. These are WAY cool but Jenvey themselves show compatibility with up to E20 which is a deal breaker for me. The little 350 cc injectors are too small IMO as well.

On PMBs website the normal Jenvey IDF (non-hidden injectors) are far more affordable.

https://pmbperformance.com/products/jenvey-...r-porsche-914-4

My big 4 cylinder with have those, 1050 cc injectors (Injector Dynamics), and run E85.

I'm betting the six-cylinder stuff is similar.

One final thought...

You could be Hybrid! (IMG:style_emoticons/default/w00t.gif)

Turn the FI stuff off, pop the venturis and boosters back in, source the fuel off of the return line, and go old school in less than 10 minutes