Thoughts on Edelbrocks Pro Flo 4 EFI XT style for a small block chevy?
Rick,The Edelbrock Pro Flo 4 is probably the most affordable multi-port sequential EFI system in the aftermarket. It is far from having the most features, it's pretty basic and simple. The user interface is from an Android tablet, no option for a laptop. It doesn't have data logging but you can get multiple screen captures from the tablet to record what's going on. There's no detailed editing of fuel or timing tables, but you can set AFR for WOT, cruise, and idle, and you tune the timing from end limits like you would a distributor with mechanical weights and springs as well as vacuum advance. It has a wide band O2 sensor and is self learning like most of the other of the latest generation of aftermarket systems.
A friend put one on his BBC with an XT manifold. He had some initial problems, the worst of which were a bad Aeromotive fuel pump, and a couple of burned plug wires which caused occasional dead misses. Once both were fixed it has been a really nice system for him. The engine is a 502 with a big cam and some big Brodix heads. The EFI has tamed the idle and low speed responsiveness that wasn't there with a carb.
The lack of features and simplicity of the tuning interface is good and bad. Good if you think an advanced system might be over your head. Bad if you want those things. Good that you don't pay for extra features. Bad that you can't option to have them.
Edelbrock has a pretty good online forum that supports the system, manned by capable Edelbrock employees. There is also customer service by phone. Contrast that to Holley where the online forum has no Holley employees (but pretty good knowledge) as well as customer service by phone.
I'm planning on fuel injection for my 383 and narrowed it down to the sniper and pro flow 4. I'm leaning towards the pro flow because of the port injection and good reviews.I have a friend running the sniper and is very satisfied as well.Of course while the Holley Sniper is another choice, it's not multi-port or sequential. And with its own set of advantages and disadvantages.