Thread: Safc2 and Innovate LC-1

Ok guys here's the new thread. For all you who havn't been following along my short but seemingly long tunning journey, my setup is an safc-2 and the innoivate lc-1 wide band with the db guage setup. I have a 91 b13 and it's n/a. I have minor bolt-ons and my goal is to basically find out what's the best a/f ratio at wot for performance wise and for the low throttle setting, what numbers should I be lookin for to save gas Again thanks guys who have even helped me get this much of an understanding and for all who are looking to add a coment or advice, you're also more than welcome. So please share some knowledge here.

^ Just for reference to keep it in one place

And yea, you can adjust the RPM points for 2 throttle settings - High and Low. For anything in between, SAFC interpolates the data, and for anything outside the range, I believe it uses the relative max/min value. So you tune your high throttle setting to use more fuel an your low to use less. You can also choose the points where high and low throttle are defined.

How can I define the low and hi throttle? Also, when I'm on wot sometimes, I've noticed the a/f ratio getting in the 10's sometimes.... Is that normal or what should I be looking for?

Your best bet is to read the SAFC manual before operating it. It isn't very long and it will make all the settings clear to you

How often is sometimes? Be more specific! And how long does it stay there, and when does it happen? Sometimes when you hit the gas hard it will run rich at first while the engine catches up with the ECU.. at least I assume that's why it happens. Throttle is suddenly WOT and the ECU freaks out and adds fuel I assume. Just takes a very short time for the airflow to catch up and match it.

Ok but you have the safc2 or the neo? Also, can you give me some base settings that I should work off of. When I said the a/f ratio reads in the 10's, it's only at first when I go wot, then goes to mid 11's mid 12's and so on til I get back to 14.7-15 ish.

I have the neo, but it's not hugely different. You already have your base tune haha.. straight 0's. You're not going to be doing a whole lot without some sort of forced induction. Just tweak the stock tune a little bit rich.

I'm not familiar with how to tune SAFC exactly but I'll give you some numbers to go by. For best power on stock and even heavily modified N/A engines you're looking for 12.8:1 air/fuel ratio at WOT. That rich spike when you first get on the throttle is by design. It's called acceleration enrichment, and it is very rich to keep the car from bucking when you stab the throttle and then it acts to keep the mixture rich (but not in the 10s) during acceleration. I wouldn't do anything to remove that initial richness, but I would work on the steady state aspect of things and aim for 12.8:1 at WOT.

During cruising and light load conditions you might be able to take out a little bit of fuel to save some gas. I'd be real curious to see what your car cruises at stock. I run around 15.7:1 cruising but I bet you could go as lean as 16.5:1 or leaner. Make sure you've got high octane and are confident in the timing of your ignition.

Danja said it already... but i really think you need to read the SAFC manual throughly... all else i belive has been addressed on the previous post and now by the good old ben...

I understand how the safc works and all but I was just unsure what type of a/f ratios I should shoot toward for the best performance at wot and the best fuel economy during cruising and light load. Right now, when I'm cruising, it's between 14.5-15. Your saying you think I can go even leaner? What if I only am running 87 Chevron with stock timing?

You could go a tad leaner maybe before running into trouble on 87 octane and stock timing. I wouldn't go past 15.7:1 and would probably aim for 15.3:1.
More important is timing. You'll see more gains in miles/gallon by advancing your timing than by leaning the car out. You can't advance it any on that 87 octane though. =/