Trying to get my A/F #s down

[starfish]

Right now I've been using 12:1 fmu,255hp,stock internals,.57 trim,intercooler,Blox BV,elec FCD.My A/F #s have always been around 14-15 at 8psi.could I drop in some hahn 220cc/min injectors to add more fuel?If not what could I do to bring down my numbers.Dont have much cash to spend at the time.What would be the easiest way to do this?

 

[Slo2gen]

220cc is smaller than stock, your best bet is to buy an SFMU that way you can adjust it a little bit. Or you could get some 270cc injectors and drive around for a bit while the ecu relearns your fuel trims.

 

[starfish]

220cc is smaller than stock, your best bet is to buy an SFMU that way you can adjust it a little bit. Or you could get some 270cc injectors and drive around for a bit while the ecu relearns your fuel trims.

Yeay,reading the gs specs I got the #s mixed up with the fuel pump #s.So the stock ecu can relearn the trims with 270s if I drive around bringing the boost up to 8psi?Or is it easier just to change to a SFMU.Also I'm at the scrap yard alot, Is there any injectors from another car thar are alittle bigger then mine that I can use in the 420A by just bolting in?

After looking at the hahn page for injectors, they say that the stock injectors are 190cc

Yeay,reading the gs specs I got the #s mixed up with the fuel pump #s.So the stock ecu can relearn the trims with 270s if I drive around bringing the boost up to 8psi?Or is it easier just to change to a SFMU.Also I'm at the scrap yard alot, Is there any injectors from another car thar are alittle bigger then mine that I can use in the 420A by just bolting in?

After looking at the hahn page for injectors, they say that the stock injectors are 190cc

My goal is around 11lb boost,not looking to go over.Also will 4G injectors fit in a 420A?

 

[Slo2gen]

None that I'm aware of will just swap in and go. The stock ecu will learn to a point but even on 270cc injectors a lot of people say they foul plugs often just because of how rich it runs. I would honestly recommend changing to an SFMU. Another way you could squeeze a few more drop out of your injectors is by rewiring the fuel pump. You can run bigger injectors, say stock turbo 450cc but you need an SFMU and SAFC to scale them down enough so your car will idle them.

 

[starfish]

None that I'm aware of will just swap in and go. The stock ecu will learn to a point but even on 270cc injectors a lot of people say they foul plugs often just because of how rich it runs. I would honestly recommend changing to an SFMU. Another way you could squeeze a few more drop out of your injectors is by rewiring the fuel pump. You can run bigger injectors, say stock turbo 450cc but you need an SFMU and SAFC to scale them down enough so your car will idle them.

I'm not sure what you mean by rewire.If I can get the A/Fr's down just alittle like 12-13, that would be perfect.I'm only at 8lbs and I drive the car daily(only car that is registered).I'm really nervous when I hit 8lbs and my #s are 14.9-15.3.Ive heard thats normal for boosted 420A with a 12:1 fmu,but it makes me real nervous!