Any ideas for tuning a ka-t with an safc????

[D1 guy]

Ive got a boost designs turbo kit with 370cc injectors, safc, and an apexi gt spec exhaust. I need help tuning this safc. Is there anyone on here with about the same setup running an safc? If so can you help me with the settings on this thing? I dont know where to start with the fuel curve or anything. Any help would be awesome.

[Kouki Monster]

First things first, calibrate your knock senser, the guide for the SAFC will tell you how. You don't wanna blow your motor playing with the fuel. I would just run rich as crap, then gradually subtract fuel until I started seeing knock. When you see knock, richen it back up a bit until it goes away. I think that's about the best, safest, fuel tuning you will get aside from putting it on a dyno w/ a wideband, IMO.

[4felix20]

from what i've heard, that knock sensor isn't very reliable. i wouldn't trust it...but that's just me.

for an safc and 370cc injectors, you need to subtract that excess fuel they're squirting out. most people with 370s set their safc to -27% across the board until they get on a wideband o2.

[D1 guy]

Is that all I should do? Set it at -27 and Im good to go for awhile? There isnt a trustworthy tuner shop for 300 miles. It sux where Im from. I had to drive 5 hours to get my supra tuned. I dont want to do that in the s13. lol Im looking for an easy way out. I dont want to go with the jwt yet though. I need to learn how this fuel system works thats why im using an safc. ANY MORE IDEAS OR THOUGHTS ARE GREATLY APPRECIATED. If you know of anyone with this same setup (that runs good) feel free to post all their settings. Ill owe you guys one.

[Tictakman]

this thread may help you too. keep in mind structure is using 50lb injectors and not 370's.

zerothread?id=95812

Zak

[D1 guy]

Thanks and also, I know this is a very noob question, but what a/f ratio should I strive for? Itd be easier to watch numbers than bouncing led lights.

[NX95240]

Air/Fuel Ratio Limits 6.0:1 Rich run limit 9.0:1 Low power, black smoke 11.5:1 Rich best torque at WOT 12.5:1 Safe best power at WOT 13.2:1 Lean best torque at WOT 14.7:1 Chemically ideal 15.5:1 Lean light load, part throttle 16.2:1 Best economy, part throttle 18-22:1 Lean run limit

hope this helps. got this off the KA-T.org site

[Tictakman]

i hope u have a wideband to watch this. idont go by a air/fuel meter.

Zak

[D1 guy]

Yeah Ill be ordering a wideband tomorrow!!! I can get the aem unit at wholesale, is this a good Idea? I plan on ordering the one with the gauge tomorrow.

[Tictakman]

not srue on the write up of the unit but all you need is something that is more accuate with numbers to tell you if you are rich, lean, etc. im using the lm-1 and it works fine its just a little bulky.

Zak

[D1 guy]

the aem uego wideband is supposed to be very accurate, Im excited about this whole setup. Im putting a 40,000mile ka motor in my car starting tonight and should have the whole thing finished by this comming weekend. Its my spring break and while all my college friends are at the beach, Ill be building my ka-t. Thats more fun to me any way. I would be going with them, but I spent all my money on my freaking car. (I cant think of a better way to spend money though lol. Ill keep you guys posted and Ill try to take some pics either tonight or tomorrow. Thanks

[Tictakman]

remember to retard your timing...

Zak

[D1 guy]

any idea on how much to retard it?

[toki]

how much boost are you going to run?

[onosqv]

Is that all I should do? Set it at -27 and Im good to go for awhile? There isnt a trustworthy tuner shop for 300 miles. It sux where Im from. I had to drive 5 hours to get my supra tuned. I dont want to do that in the s13. lol Im looking for an easy way out. I dont want to go with the jwt yet though. I need to learn how this fuel system works thats why im using an safc. ANY MORE IDEAS OR THOUGHTS ARE GREATLY APPRECIATED. If you know of anyone with this same setup (that runs good) feel free to post all their settings. Ill owe you guys one.

Set it to -27 if you install fuel b4 turbo! If you put those settings on after turbo, you may very well run lean and blow up.

[Tictakman]

i retarded my timing to 16. i think it was stated that you should retard .5 for every lb of boost.

Zak

[D1 guy]

Im putting it all on at the same time. 370cc injectors, safc2, nismo fuel pressure regulator, and turbo kit. What should I set it to since im putting it all on at the same time? Itd suck to blow up the motor lol. Also what adjustments should I make on my fuel pressure regulator? (its adjustable)

Thanks

[D1 guy]

I was planning on running about 10 or 11 psi. I ordered a wideband o2 today. Where do you install this thing since there is already an o2 sensor on the top of the exhaust. Ive got a bung on my downpipe for the factory o2 sensor, do I have to weld another bung on for my wideband?

[onosqv]

Im putting it all on at the same time. 370cc injectors, safc2, nismo fuel pressure regulator, and turbo kit. What should I set it to since im putting it all on at the same time? Itd suck to blow up the motor lol. Also what adjustments should I make on my fuel pressure regulator? (its adjustable)

Thanks

If you are putting everything on at the same time, you have a much bigger chance of detonation.

Setting it to -27% will make your 370 -> 270 across the board.

I'd just leave it at hella rich.

I hope you get your wideband installed to so you can tune once it all works. You're probably gonna have to weld another bung.

Anyway, buy a couple set of spark plugs (you're gonna foul some up easy) - while you are at it, might as well get a new narrowband o2 sensor & spark plug wires (just in case).

Then use your favorite tuning method for idle, part throttle, full throttle, etc.

Specific settings vary widely from car to car, even cars w/ the same mods. That's usually why people don't tell you what their #'s are, since you can blow up just as easily if you use someone else's #'s.

[c-rad]

You can put it in the downpipe... Which one did you end up getting? I know the PLX widebands have a narrowband output so it can be a direct replacement for the OEM unit as well.

[c-rad]

If you are putting everything on at the same time, you have a much bigger chance of detonation.

Setting it to -27% will make your 370 -> 270 across the board.

I'd just leave it at hella rich.

You have to take into account the dead time of the injector for the 1k rpm idle setting... I would suspect a good spot for idle is around -10%

[D1 guy]

Any idea on how to prevent any detonation all together. So basically I just set it to -27 and run hella rich and hope not to detonate? I have my motor completely pulled so its all gotta go on at the same time. Should I just run my factory injectors and fmu for a day or so and then install the safc and 370s? Would that be better?

[onosqv]

You have to take into account the dead time of the injector for the 1k rpm idle setting... I would suspect a good spot for idle is around -10%

O yes , I just figured I'd keep it easy and D1guy would see that he is running super rich when he starts up the car, then can adjust the % to the exact one that will give him the right afr then and there.

But of course, your way would save him a little bit on the life of the plugs & sensors .

[D1 guy]

Yep detonation would be bad.......So I should set my idle at -10% and that wont cause any injectors to foul and save my o2 sensor also....right?

[onosqv]

Yep detonation would be bad.......So I should set my idle at -10% and that wont cause any injectors to foul and save my o2 sensor also....right?

See, we're already confusing d1 .

Ok, maybe this will be a lil more clear (sorry if I made things confusing before):

1) Install everything at the same time (else you are going to need to retune later).

2) For initial tuning: set ONLY your idle or 1k rpm whatever to -10% or -27%. You will not blow up because you are not yet under boost. We are setting this so you don't run too rich since the ecu thinks it's only 270cc and is in actuality dumping in more fuel than it thinks, thereby ****ing up your afr.

If you don't set anything, the worse that can happen is you run rich since it's 370cc (and ecu thinks it's 270cc).

DO NOT set any other rpm settings (lo throttle/hi throttle) to -27% - you can run lean if you do this.

3) Using your wideband (which should be installed by now), adjust the safc settings so you get a 14 afr at idle, and about 11-12 (a little rich, but safer) afr once you start doing your "street dyno". You will probably want 2 people to do this to make it faster, and I'm hoping your wideband kit has a data logger. It makes a lot more sense once you are actually tuning the car.

*** Of course, for this part, you need to know the steps on how to street tune w/ a safc & wideband, which should have been in at least a couple threads recently. I've only answered initial settings and how to get started

To prevent detonation all together, get a stand-a-lone and/or bring it to a shop to tune .

I would still buy the extra sensor & plugs since initial tuning will be crazy on your plugs/sensor - and if you don't need to change it, you always have spares. A few $ to save big $$$.

Please keep in mind I have not tuned my own car yet. I have just done a lot of reading (and a term paper ) on this subject. I'm still finishing up my kit & waiting for smog check to pass first (and to see how often I get pulled over by cops w/ my current paint scheme).

[D1 guy]

Yeah it is a bit confusing. Im putting the motor back in my car tonight. I hope everything goes smooth. Thanks for all of the info guys. Also I got my turbo in today and I can move the turbine (exhaust and compressor side) back and forth alittle. It doesnt scrub, but its unbelievablely close. Is this a problem? Im only going to run about 10psi. Its not a ball bearing. I can also push in on it and it moves just barely. I didnt think there was supposed to be any shaft play. What do you guys think?

[c-rad]

Also I got my turbo in today and I can move the turbine (exhaust and compressor side) back and forth alittle. It doesnt scrub, but its unbelievablely close. Is this a problem? Im only going to run about 10psi. Its not a ball bearing. I can also push in on it and it moves just barely. I didnt think there was supposed to be any shaft play. What do you guys think?

Convential turbos will always have a little shaft play when not in use. The shaft rides on an ultra-thin layer of oil that keeps it in place when it's spun. Do not fret...

[c-rad]

***** I double posted somehow *****

[D1 guy]

Does anyone have any pics of the boostdesigns intercooler install or any intercooler install on an s13.I got lots of piping and no instructions. lol thanks and for anyone whos interested, heres some pics of my project that I started today!!!! (yep there are two 240s here)[IMG][/IMG]A:\MVC-002F.JPG

[IMG][/IMG] A:\MVC-005F.JPG
Modified by D1 guy at 7:36 PM 3/14/2005

[D1 guy]

ok I was going to post my pics, but I obviously dont know how!!!