SAFC II Help - 370cc's on a non-turbo KA

[Lurkable]

I have 370cc sr injectors in my non-turbo motor. To adjust fuel to stock as if I was using 270cc's, I know the settings should be -27% for all RPMs. My question is, should the actual settings on the AFC be - or +?

I've been having troubles with my motor, and in it's current state, it runs crappy as hell at -27%, much better at 0%, and even better at +50%.

I'm afraid to test drive the car before I get the settings right, because it's a brand new motor and I want to know things are straight before I break it in. Another point of interest - the motor has 8.5:1 pistons because I was planning on turboing it. This effectively increases displacement, does it not? And if so, I assume, wether the settings should be + or -, they should also be greater than or less than +/-27%.

Can anyone offer me any advice on this? I'd really appreciate it, thanks!

[Lurkable]

Sorry, I know there's alot of information out there about the SAFC but I feel like I've read it all before. I learned alot first, and I was positive that I understood what I was doing by the time I went to install the unit in my harness.

I do know 100% that the I installed the SAFC correctly, it's been checked by multiple people. (The instructions are pretty easy to understand anyway).

I just feel kinda at a loss here. I can only hope that someone here has had similar problems. I'm going to visit my car tomorrow night to hopefully hook up some smog equipment and see just how dirty rich it's running. Any information I could take with me would be greatly appreciated. Again, thanks in advance for any help!

[Bigvinnie]

I have 370cc sr injectors in my non-turbo motor. To adjust fuel to stock as if I was using 270cc's, I know the settings should be -27% for all RPMs. My question is, should the actual settings on the AFC be - or +?

Where do you get your information from? Then have the nerve to ask if it is -/+?????

[JDS Performance]

Ill start off by saying take 270 divide that by 370 = 0.73 then minus by 1 = 0.27 so that -27, which you were right on!

You wanna do the - not +, - = subtracting fuel, + = adding fuel.

When i did mine my AFR was 18-19's very lean at idle

I set the NE1 setting for the low map at 800 insted of 1000, and it fixed the problem completely!

I dont know if this is the problem your having, do you have a wideband??

let me know if you need more help!

[spider_slayer]

just curious why you have 370's on an N/A ka? is it built or something?

[sunnys14]

he has a built motor and is running 370s while NA to break in the built motor.

[Bigvinnie]

he has a built motor and is running 370s while NA to break in the built motor.

Well it was built with 8.5:1 pistons. 370cc even if the pulse width is shrunk wont spray nothing like 270cc injectors.8.5:1 doesn't atomize worth a **** or make any good HP for N/A applications. I use to own a NAPSz24 engine with 8.5:1 CR you would want to lean it out and use the crappiest fuel you could find just to make power.Literally the compression would need to be raised in this instance in order for the engine to run properlly.

[egan]

Literally the compression would need to be raised in this instance in order for the engine to run properlly.

how would the engine run normally when not in boost then?? it might not make power but it should be able to run

[Bigvinnie]

how would the engine run normally when not in boost then?? it might not make power but it should be able to run

It would run like shiat... Less compressed air in a 8.5:1CR, and using the same injection as if it were 9.5:1 only changed the ratio to a richer than normal A/F ratio. The KA stock tune is already a little too rich for the 9.5:1 CR engines so why would you think it would run well on 8.5:1?