Aftermarket FI options for Type 4 motors 2056 or larger, Who here has gone this route and is it worth it? What options do we have? Options

[DRPHIL914]

i started looking into this 2 years ago when i was planning my rebuild motor after the drpped valve seat on the OEM motor.
I ended up building a nice 2056 with increased compression, brand new heads, counter balanced crank and of course the cam is performance minded as well.
to start i installed the d-jet and later last year i added a 50mm bored out stock throttle body from Tangerine/Chris Foley. Yes this helped a great deal, but we are still limited due to the d-jet and the MPS. So there are a few people out there that make ITB( independant throttle body) that could be used.
One is Jenvey, and i see that PMB is carrying those. It looks ike they are mated to what ever IDF intake manifold you choose. there are 40, 45, 48 options. mated with 350cc injectors.
I am wondering other than the CB performance stuff that has been available for a while, others have come to the table, who here has played around with this ? over the years ive read a lot on others using the megasquirt and micro etc and it seemd they were very difficult to tune and set up with lots of problems, trial and error.

I am looking for advice on what to stay away from and what are the pitfalls and mistakes we can avoid before jumping into this.

Look forward to some input, thanks!!

Phil

[GregAmy]

We have several good discussion topics already going on this.

The Dub Shop (Mario's a super guy) has a bolt-on system. But I think he's having difficulties getting throttle bodies:

https://thedubshop.com/dual-throttle-body-f...gnition-t4-914/

Here's a guide I wrote on my Microsquirt conversion of D-Jet (it's not a quick read*):

https://tgadrivel.blogspot.com/2020/03/on-m...914-part-1.html

Search the site and you'll find other projects with Megasquirt and Haltech. - GA

*I did it that way mostly for myself, to remind me WiTH I did and how I got there. But I figure that if you don't have the patience to read through the thing theny ou probably don't have patience to build it... (IMG:style_emoticons/default/wink.gif)

[scott_in_nh]

We have several good discussion topics already going on this.

The Dub Shop (Mario's a super guy) has a bolt-on system. But I think he's having difficulties getting throttle bodies:

https://thedubshop.com/dual-throttle-body-f...gnition-t4-914/

Here's a guide I wrote on my Microsquirt conversion of D-Jet (it's not a quick read*):

https://tgadrivel.blogspot.com/2020/03/on-m...914-part-1.html

Search the site and you'll find other projects with Megasquirt and Haltech. - GA

*I did it that way mostly for myself, to remind me WiTH I did and how I got there. But I figure that if you don't have the patience to read through the thing theny ou probably don't have patience to build it... (IMG:style_emoticons/default/wink.gif)

@GregAmy That was a good read - thanks for taking the time to put it together!
So let me ask you this:
Let's say you already have a 123 distributor with the FI points that you are happy with - could you use one or both of the triggers as a cam/crank position sensor with Microsquirt? The obvious benefit being that you do not have to take the engine out to to fit a trigger wheel (or to change a bad sensor). If possible I think it might really simplify the changeover to Microsquirt and a lot of guys already have them installed.....
Scott

[GregAmy]

That was a good read - thanks for taking the time to put it together!

You are most welcome. Did you actually make it through the whole thing?

Let's say you already have a 123 distributor with the FI points that you are happy with - could you use one or both of the triggers as a cam/crank position sensor with Microsquirt?

I don't know a lot of about the 123 or how the factory system triggers the injectors...however, WAG'ing it from the stock DJet computer diagram, I think not.

If I'm reading that diagram correctly, the disty simply provides a "fire now" signal to one of two banks (stock DJet is batch injection) with no logic. Disty triggers open or close like points (or is it Hall Effect?), computer does some electrical magic, and the injectors fire.

Microsquirt (all pretty much all EFI), on the other hand, wants to know where the crankshaft is relative to TDC and from that, and your desired tuning, it calculates timing and fires the injectors; DJet triggers can't provide that, they're a binary signal.

Doesn't mean you can't continue to use the 123 disty and ignition coil if you want to, they'll run fine. But once the MS is installed it's only a few more components to remove the disty (and sell it) and put an EFI-driven coil on it. An EFI-driven coil also which allows you to vary timing based on RPM and load. - GA