Finally Maxed out the SR Injectors

[Jookmasta]

jgs precision sells a log mani kit for our engines. u have to weld it up or get it welded up urself. Its one of the cheapest (if not the cheapest) routes when considering a mani. I personally got it as part of kit way way way way back when (probably like two and a half years ago). Its made out of cast iron so no worries about cracking. Just gotta cut the flange and ur good to go.

[DRIFTEADOR]

yes, more fuel within a given time period but less fuel per cycle. if youve ever seen a fuel map you'll notice the injector duty cycle decreses as you near redline. and thats why injectors should be rated by torque not horsepower.

for example, lets say you have a motor that makes 150tq all the way to 10,000 rpm, thats just under 300hp. 4 260cc injectors should provide more than enough fuel cause thats about how much tq a n/a ka motor puts out but if you were going by the recommened injector size based on hp, you'd need at least 440cc injectors.

[Checkered-Member]

yes, more fuel within a given time period but less fuel per cycle. if youve ever seen a fuel map you'll notice the injector duty cycle decreses as you near redline.

It has to do with the volumetric efficiency of our engine since it’s a 4-valve 2 cams it’s considered to be at 90% efficiency. However that’s overall, peak efficiency can go to about 100% at 4000-4800rpms (what do you know peak torque occurs here) the more efficiency an engine is, the more it will flow, more flow needs more fuel, and at that moment when you reach maximum volumetric efficiency you can max out the injectors…boom