EFI project has started Options

[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

[mb911]

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

Thanks for the input. I am following @jpnovak s blueprint on this. He has specific road map on this setup and he does these everyday with great success. I will for sure keep your thoughts in mind.

[JmuRiz]

Do you need MFI heads for this to work?

[mb911]

Do you need MFI heads for this to work?

Yes

[mb911]

[sixnotfour]

Do you need MFI heads for this to work?

Easy button,, PMO,
https://pmocarb.com/products.htm

[mb911]

Do you need MFI heads for this to work?

Easy button,, PMO,
https://pmocarb.com/products.htm

Or Jenvey heritage. I just like to be different

[rick 918-S]

Do you need MFI heads for this to work?

Easy button,, PMO,
https://pmocarb.com/products.htm

Or Jenvey heritage. I just like to be different

I'm with you. Use what you have. Same principle.

[mepstein]

Do you need MFI heads for this to work?

Easy button,, PMO,
https://pmocarb.com/products.htm

EMPI bought the company but I don’t think they are currently available for sale.

[sixnotfour]

Do you need MFI heads for this to work?

Easy button,, PMO,
https://pmocarb.com/products.htm

EMPI bought the company but I don’t think they are currently available for sale.

Just saw That 2 days ago all links still worked , We have a Mfi 3.0 with the pmo Injector stacks , and they listed EFI injector style around 3k.. uses carb manifolds,
link for reference
https://www.racetep.com/manufacturer/carbs-...er/pmo-itb.html

[technicalninja]

You do very nice work, Sir.

What is the upper block carrying?

Fuel maybe?

[mb911]

You do very nice work, Sir.

What is the upper block carrying?

Fuel maybe?

Yes Fuel

[JmuRiz]

Cool fuel and vacuum block, right.
Jpnovak’s setup is cool.

It does look like I’m too late on PMO throttle bodies, I like they can work with stock airbox. I snooze I loose haha

[mb911]

Cool fuel and vacuum block, right.
Jpnovak’s setup is cool.

It does look like I’m too late on PMO throttle bodies, I like they can work with stock airbox. I snooze I loose haha

Just use the carb throttle body’s and you will be just fine.

[mb911]

Nothing much going on here. I need to purchase the new Bosch 044 fuel pump or equivalent . A few weeks back at it