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

[JamesM]

Look forward to some input, thanks!!

Phil

You can run aftermarket FI without going ITBs and unless your motor absolutely needs the ITBs then you are probably better off avoiding them. Your issue isnt so much going to be the lack of airflow with the d-jet intake so much as it is the lack of adjustability with the fueling and timing. Aftermarket injection on top of stock intake. Less cost to build, easier to tune, most likely more drivable as well. Added bonus, it retains the stock appearance and uses less aftermarket parts.

I expected the stock D-Jet induction was not going to be enough for my street car. Frankly, maybe it isn't. But I've yet to see any indications via the MAP that it's struggling for air with the stock throttle body. - GA

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If your motor is near stock or a mild performance build you will save yourself a lot of money and effort sticking with stock 1.8 or 2.0 intake plumbing (Not 1.7 though). An aftermarket ECU will always be an improvement over d-jet but no real need to change the induction plumbing unless you are planning on 140+ hp or a larger displacement 2270 etc