Hi guys I was wondering if anyone can help me with some questions about injectors. can you go to big? Is there a sort that i recommend for steeping up a 6g74 N/A. If anyone could help me out that would be fantastic.

What mods are you doing that require upgraded injectors? You can go as big as you want given you have a pressure reg or aftermarket ecu that is capable of controlling them. I'm running 440cc with my supercharger 6G74, which is only like 25% larger than stock.. and they are running an 80% duty cycle to produce near on 300HP ATW.

You would have to do some pretty significant mods to an NA motor to want to bother with an upgrade.

Yea as above, really for NA purpose no need to upgrade for higher capacity, worthy upgrade are 380 injectots as they have better spray pattern so you migh get more efficient burn but thats about it.

@ woob, how much boost are you runninng, my injectors are high flowed and im getting 70% duty cycle @ 6.5 psi at thats with AFR at 11

Taking the heads out 90% but still keeping them reliable, lineboring them to accommodate big cams. Heavy duty valve springs, new bigger valves, adjustable cam gears, fuel pressure regulator, new fuel pump, rpw twin fuel rail kit, flash tune the list goes on.

So head work but not touching pistons or crank or anything? I can't see new injectors being required tbh.

Andrei, 6.5psi, I'm running rich right now it isn't funny though so it'll be in for a retune next week. I can't remember my AFR.. 10.7 or 11.7 or something iirc.

What mods are you doing that require upgraded injectors? You can go as big as you want given you have a pressure reg or aftermarket ecu that is capable of controlling them. I'm running 440cc with my supercharger 6G74, which is only like 25% larger than stock.. and they are running an 80% duty cycle to produce near on 300HP ATW.

You would have to do some pretty significant mods to an NA motor to want to bother with an upgrade.

Agreed 380 injectors would be all that required unless you are going forced induction. Woob am i doing my maths wrong aren't 440cc 60% larger than 275cc.

Oh my bad, I thought stock was 330 for some reason.... which would still make it 33% larger :P

im running standard magna injectors in my 3.8 magna making around 160fwkw no issues with it at all