370cc injectors

[nimtZ]

hey i ahve a ka and 370cc with safc and stock ecu and i was wondering if anyone knoiws how much to correct for idle?

[Jookmasta]

i personally used -25% across the board for about a week. i just moved it to -26% across the board. car doesnt backfire as much but i did notice a drop in mpg with -25%. So just adjust this in the high and low throttle menu in the safc.

[KATwo40]

Mathematically speaking, the stock injectors are 270cc/min. In calculation, to imitate the stock air flow reading, you'll need to reduce the injector pulse by 37% (270 is 37% of 370). However, the ECU is tuned to run N/A, which would be around 14.7:1 ratio. Since you're turboing, you'll want to run more like 11.9-12.2:1, resulting in somewhere around 25-28% reduction in pulse.

The best thing you can do is hit it at aroud 25-28%, then go straight to the dyno (with wideband O2 testing) and tune it.

[SloMoe]

However, the ECU is tuned to run N/A, which would be around 14.7:1 ratio. Since you're turboing, you'll want to run more like 11.9-12.2:1, resulting in somewhere around 25-28% reduction in pulse.

For idle speeds you can run it leaner, its under load and WOT where you really want to richen up the mixture. 11.9-12.2 is kind of rich for an idle mixture.

[KATwo40]

Well, yeah. LOL sorry, forgot to add that little tidbit.

[Jookmasta]

so ur saying that i could put the safc to -30 or 35% since i dont have my turbo on yet and still be fine since i am still NA? if it helps out on the mpg and is still safe, im game to try. i always read that b/w -25 and 27% was where it needed to stay...........

[KATwo40]

That's correct...for a turbo application, because it needs to be richer than N/A. I'd put it at 30%, then go to the dyno with wideband testing and pay for a half our or tune time. See what your AFR's are and tune accordingly.

Actually, lemme change that...

I'd wait to put the injectors or the SAFC in until I got my turbo stuffs. Then, I'd put it all together, put the SAFC at 28%, then drive carefully to the dyno and spend an hour on test/tune.

[Jookmasta]

well im NA and i currently run 26% so i guess i should b running it more lean since i am NA? what should it be set at then?