420A 420a injector upgrade

[DrewmHolland]

I’m currently looking at some 1998 mustang gt injectors that are rated at 24lbs an hour as an upgrade to my 19lb stockies does anyone have any experience with them, I’ve heard they’ll fit but I’m not 100%

 

[BLACK'98DSM]

They will work. Easy plug and play. Even the connectors are the same. The total injector length is slightly longer, but that will not cause an issue. Just keep in mind, without Megasquirt it will idle rich after an injector upgrade.

 

[DrewmHolland]

Currently I have an fmu set up that bypasses my original fuel pressure regulator and I’m able to drop my base fuel pressure so hopefully I can stay in a decent afr at idle

I made the mistake of decapping my injectors for more flow and the car runs like crap, I have to idle with 15psi and I’m at about 25 psi under boost while still running too rich

 

[BLACK'98DSM]

Yea that isn't the greatest idea. You also changed the fuel atomization factor by doing that.

 

[DrewmHolland]

Anyways since these are only a mild upgrade from stock it ought to be fine and I’ll be able to idle with like 30-35psi in the rail which will make fuel delivery much more consistent