Sorry to chime in off topic, but the quote above scares the bee-jeezers out of me. I’d hate to see you grenade a piston or two or pop the head-gasket, but relying on the cold start injector for fuel supply on a running engine is a very poor choice for a few reasons, location of the fuel being injected and the type of injector it is.
1) The cold start injector is not the same in design or function compared to the port injectors.
2) The cold start injectors have no real calibrated flow value, they just squirt "some amount" of fuel into the plenum that some cylinders will get, to aid in starting.
3) Cold start injectors have different spray patterns. I’ve seen vertical straight down on the plenum floor and I’ve have seen some that spray a fan pattern sideways aimed down the throat of the throat of plenum, right past #1 cylinder and just skimming the entrance of #2 cylinder! Those two cylinders WILL be running MUCH leaner with that style if used as a 7th injector!
4) Its function for delivering supplement fuel for cold starting is adequate, but NOT for supplementing fuel flow on a running engine due to the injector design and it's location in relation to the port runners!
If you are wanting a 7th injector, you are far better off using a regular fuel injector mounted ahead of the TB, between the AFM and TB, as that will insure a more consistent cylinder to cylinder mixture, (though still not ideal as “wet flow” into the first couple of cylinders will be different than the last cylinders, but a far cry better than the OE cold start injector location), and a regular injector is for more consistent in its quality and quantity of fuel delivered, as well as being a known flow rate!
Sorry for the tangent, but I couldn’t let this go without at least commenting. Hope this helps.