How big of injectors for 7AFE Options

[Brianerstad]

How big of fuel injectors should I get for my 7afe. I'm going to boost it around 10 psi trying to make around 200hp. Thanks guys

[Syaoran]

315cc are near their peak for ~220hp i believe...

[Brianerstad]

Any suggested injectors?

[Syaoran]

If you're getting 315cc, 7m-ge supra injectors are high impedance and are 315cc.

They are the ones with the lime green top if I'm not mistaken.

[Brianerstad]

Thanks!

[malpaso]

Stock ST205 has 245HP and is running on 540cc injectors. I know they handle safety 300HP without raising fuel pressure (so there is some space for upgrades). So engine with 22% HP more than you want has 540cc... If you lower 540cc for 22% you get 420cc. But that is just mathematic.
On my old ST-T I had installed 330cc injectors (from Ford Probe I believe) and was running 206HP. I had no issues and running it like two years. Anyway... What I know is it was not safe at all because those 330cc were running on 100% of duty cycle (to give enough fuel to those 200HP) when pushing it. Now If I had to run 200HP car and would want to be safe for 100% they are running max at 80% of duty cycle. And again using mathematics I'm somewhere around 400cc.

So from two different points of view I got into range 400-420cc. How much you believe in my mathematics is up to you .

This post has been edited by malpaso: May 9, 2012 - 5:07 AM

[Smaay]

^^^ those are also low impedance injectors, you will need a resistor pack. just get the NA 7M-GE injectors. they are a drop in and work.

http://www.lextreme.com/7mge.html

[Brianerstad]

Thanks guys