Safc??

[skyr31]

Gday everyone! What is the advantage of installing an safc to my rb25det?? Does it increase power, or only driveability? I have a fmic, 3 inch, increased boost and a pod. Is it worth the $500 odd bucks?? Thanks!!!

[Timmy G]

Don't forget the cost to dyno tune.

I speak completely from what I've heard - not exp. I haven't even got my 25T yet (13 days!!).

But it controls the sensors on your car and via that you can run lean (fuel economy) or rich (performance).

I have a Q on this topic.. does the Apexi Power FC do everything the SAFC does + more?

[rev210]

Originally posted by Timmy G

Don't forget the cost to dyno tune.

I speak completely from what I've heard - not exp.  I haven't even got my 25T yet (13 days!!).

But it controls the sensors on your car and via that you can run lean (fuel economy) or rich (performance).

I have a Q on this topic.. does the Apexi Power FC do everything the SAFC does + more?

Yes PFC does more.

There are quite a few threads that explore this topic that you might find interesting if you do a search. Have fun:)

[Hicks]

Lean=Performance (but too much is dangerous)

Rich=No performance and smoke outta the exaust.

This is what your car will do with high boost and no computer.

This is deffinetly the next upgrade. Well worth the money, you can still use it with an after market turbo because you can also change injector sizes on it.

With about 13 pounds of boost you will have a big flat spot at about 5000 all the way up to bout 6500, this is when its running rich, s-afc fixes this.

[Guest mistypark]

Hi.........

I've got a S-AFC coming in the next few days so i'll let you know what sort of power increase I get after its been installed.

Currently I'm making 159Kw at the wheels with POD Air filter, Cat back exhaust and slight boost increase.

[ex-static]

We had people getting 20-30rwkw gains on the dyno with just an safc tune.

Great investment.

[Timmy G]

And same/improved fuel economy on those settings?

Originally posted by ex-static

We had people getting 20-30rwkw gains on the dyno with just an safc tune.

Great investment.

[Guest nismogtsx]

I can only speak for my car... But before the manual and the S-AFC it cranked out 230rwkw's with a huge flat spot at 4500rpm and higher... Also the bosst used to do really weired things around the 5500rpm mark and drop away from there...

So i have had the manual fitted and a twin plate clutch... My computer was sent away to be chipped for the new 300zx AFM (as the original one died and this was the only possible conversion)... When it came back the car ran much better but was very rich... Plus the power level was a little low... So i bought a S-AFC and we got it on the dyno the other day and found it got to 327rwkw but then the clutch started slipping so its back in the workshop getting a twin plate fitted ATM... Once this is done we will dyno it again....

So for me i have spent thousands on the engine....

I was getting very average performnance and the S-AFC was able to solve all the problems... Cause if you got the right parts but their not tuned right then you may as well have sock bits....

[benm]

Sorry excuse my ignorance im a n00b but what is a S-AFC ? in basic terms pls, I hear about it alot.

[Silver-Arrowz]

Originally posted by benm

Sorry excuse my ignorance im a n00b but what is a S-AFC ? in basic terms pls, I hear about it alot.

It's a product from APEXi that alters the car's air/fuel ratio. It tricks the car into believing it's got more or less air to mix with the fuel.

[franks]

Originally posted by nismogtsx

I can only speak for my car... But before the manual and the S-AFC it cranked out 230rwkw's...

So i have had the manual fitted and a twin plate clutch... My computer was sent away to be chipped for the new 300zx AFM (as the original one died and this was the only possible conversion)... When it came back the car ran much better but was very rich... Plus the power level was a little low... So i bought a S-AFC and we got it on the dyno the other day and found it got to 327rwkw...

thats close to a 100rwkw gain with an SAFC, rechipped ecu, manual conversion and a twin plate clutch?

WTF!? :eek:

[Guest nismogtsx]

Franks... what i was trying to say was i needed the S-AFC to make the whole package come together.... I have spend thousands on cams, turbo, honing, list goes on... injectors, fuel rail and pump.... BLAH BLAH BLAH

Finally with the AFM ratio's being controled i can get that power cause before it used to drop off after 4000rpm and then there was nothing.... So now it boosts and gains all the way to 7500rpm and smooth as a whissle too...

[Guest nismogtsx]

Have a look in the general section to discover my latest hassle which has left me devisitated and now i want to sell... NOT... But i have been with out my car for over 1 month now.... and still no sign on when it will be ready to drive.....

Title of topic is "Been with out my car for 1 month" or something like that. Check it out....

[franks]

ahh ok. from wot you said it sounded as though the SAFC did all that on its own! now that you've cleared that up its quite obvious you have a *monster* !!!

understood. i'm getting my SAFC soon. im not expecting that much from it though. i dont think much power gains (although certainly alot has been experienced from members of this forum) can be made from just fuel trimming....

[JimX]

I gained about 15kw and around 60Nm with my S-AFC tune. But even if I didn't get the extra power I would still appreciate the better fuel economy and power delivery. There used to be a big flat spot in my power curve from around 4000-6000rpm, so you can imagine how quickly I needed to react to change gears when flooring it as the thing just took off in the last 1000 revs up till redline. All I can say is thank god for rev limiters.

If you can afford a Power FC I would rather go with that, but if you can find a cheap S-AFC it is definitely a worthwhile investment to use while you save up for the Power FC. Anyone clued up on electronics can install it themselves (my advice - melt a portion of the ECU wire shielding and splice the new loom in directly rather than cutting the old wires and making new joins) and it'll cost about $140 to tune from a place like Hills Motorsport.

The S-AFC will also help prevent stalling if you have an atmo bov, so it also acts as a safety (and anti-embarrassment) feature in that regard.

[Timmy G]

I see Apexi S-AFCs on web sites for like $600. You could probably get a decent price selling it if you were going to upgrade to PowerFC later on..

[LastTemptation]

ull come across them for about 200 bucks sometimes on ebay..

[strutto]

Dig men dig!!

[QuickR33Melb]

If you want to talk air fuel computers and have a guy that knows the skyline scene back-to-front call Mike at True Vehicle Enhancements on 93805082.

Great guy and excellent prices. He is highflowing my turbo at the moment so the next step for me will be AFC of PowerFC. Oh thats if you live in Melbourne

[NickR33]

In my humble opinion an aftermarket ecu that can be tuned on a dyno is one of the most important mods you can do... it allows good tuner to make the most of your other mods... otherwise your just burning wasted cash and fuel... and the SAFC also displays revs, knock, throttle, air flow etc while you drive and has a peak hold function...

and it looks all cool and sh!t...