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

[billh1963]

Probably a stupid question but are Holley sniper and similar systems too big for the Type IV? With 4 bbl intake "manifolds" available seems like that could work (if not too big).

[GregAmy]

Probably a stupid question but are Holley sniper and similar systems too big for the Type IV? With 4 bbl intake "manifolds" available seems like that could work (if not too big).

Depends on what you want it for and where you want the power band.

I decided on 36mm TBs (times four holes) because my 2056 is a ~9:1 street car with a self-imposed ~5500 redline and I wanted solid low- and mid-range airflow velocity for torque. We'll see how it works out.

If I was installing it on my race car, with more compression and ~6500 hard stop and no care what it does down low, then I might consider 40s, maybe 44s (I currently run 40 Dells with 36mm venturis and it seems pretty darned strong up top, wants to keep going...)

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