On Monday, June 20, 2005, at 08:07 AM, David Staten wrote:

The injection controller will be the Real World Solutions EC2. It does stage. No, you aren't wrong. That is what I want. It's not overly complicated when you dont have to build it from scratch.. thats why Im using the stock TB. The only thing I am having to fab is the runners and two injector bosses.
 
I am using stock fuel injector ports on the primaries (which are in the block). Those are less than 2 inches away from the primary intake ports. I will not be moving them.
 
As for secondary positioning, how far back can I go before I have to start worrying about the fuel charge not being inducted all the way into the secondary ports? As in... the fuel charge shot into the secondary runner (when secondaries are active) gets sucked all the way in on THAT intake stroke, and not, lets say.. the next one...Or are you saying that doesnt even matter? If injectors do better farther away from the port/way upstream, why are they not like that in the stock config? Several other EFI engines I've seen appear to inject RIGHT before the intake port (Noticed while shopping for intake parts), not way upstream...
 
It seems that the folks who have difficulty idling at low power smoothly are the ones who 1) dont sequence their airflow into primaries first, secondaries only at higher power... and who have their injectors 20 something inches away from the ports. Thats just an observation I've picked up over the past year... and maybe its mistaken.
 
Dave

Dave, based on Paul Lamar's current p port testing there is no problem with placing the injectors at the far end of the runners. This is also backed up by an article on the internet (How to Fabricate an Intake Manifold) The idle issue is not with injector location but rather with butterfly location. The further the butterflies are from the port, the worse the throttle response and idle. At least that is the current theory and is born out by Ed's experience when he place the butterflies at the far end of his intake runners. Jerry