Apexi AFC II performance increase ??? or Not ???

[Xplod]

Will a Apexi AFC II (Air fuel convertor) give a noticable HP increase on a ae111 trueno with a 4age black top motor ??? or am i just wasting my money ??

The car already has TRD headers, 2.5 inch exhaust, HKS pod filter in cold air box.

I have run the car up on a exhaust gas anaylser and it appears to being running slighty rich so ..

Any comments or info welcome

[PumpN]

it needs to be set up, if its done properly then you will make some power, and yes you should be able to notice the difference

this is really a 'how long is a piece of string' type questions tho, same as asking will i make power by changing my ecu to a linkplus, a better tune will allow you make more power, the system will only allow you to have a better tune, hope that makes sense

[Loudtoy]

Yeah you will get more power as long as it is installed and tuned correctly - and if your doing it make sure it's in properly and gets tuned correctly on a dyno - seat of the pants might make you feel like it's going quicker but generally you'l just be losing power somwhere making it feel like a gain elsewhere if that makes sense!
But after all the a 5-7kw gain at the wheels is generaly what your looking at but with more gains in torque through the midrange! Thats of course with someone who kows what theyre doing tuning it

[Wildcard]

While I'm not a tuning expert - to create power here you want to be leaning out your fuel map since you can't change other factors such as the spark advance with the SAFC.

An ae111 already runs quite high compression [11:1] and your only able to run it on a maximum of 98 octane. These two factors mean your already pushing the limits of what it was developed for so I'd say there would be very little safe HP increase to found here.

[Xplod]

Cheers guys for the info

Sounds like it would make a desirable power increase, I will be installing it myself being a mechannic and all, but will get it dyno tuned as soon as i get time / money

I'll post up some dyno graphs when its all finished.

[gt4mike]

You are a mechanic yet you cant spell mechanic and you didn't know changing your a/f ratios can develop more power? Thats a very scary thought.

Also you havent paid much attention to previous posts about the cars current tuning. Your ecu is tuned for 100 octane, and your car runs high compression, so running it on 98 is already putting it closer to detonation, so theres probably not much room before it runs into detonation - so a very minor power increase.

[B1NZ]

Well going on recent experiences, my mates MD 1600 mivec mirage had a SAFC2 installed and tuned by Andre at speedtech, approx $1100 later he got 6kw@wheels which is not much but if you take into account the torque curve, it was a lot better (smoother) and had a bit more!

When i have the $$ i will be getting this done to my car also so if you havent done this by then i'll let you all know what sort of gains are to be had

[gt4mike]

That sounds like a lot of money for a small gain. Also, how close is this engine to detonation? It could blow up on the next hot day. A 20v isnt going to get the same gain necessarily.

[Loudtoy]

That sounds like a lot of money for a small gain. Also, how close is this engine to detonation? It could blow up on the next hot day. A 20v isnt going to get the same gain necessarily.

No might get more or might get less! Another nice function of the safc2's is a knock sensor built in that you can monitor all the time - car in question is fine feels alot stronger than it did before! Also when you talk about alot of money for a small gain thats what happens when you work with na cars! Unfortunatley we can't just up size the turbo and boost, bigger intercooler etc etc like you guys can so once we got exhaust, intake, headers and suspension we go looking for more power with things like ecu's and cams etc but being that cams are better suited to aftermarket ecu's we do that first! Sort of makes sense also the gain in question was around 7% so really not that small!

[Wildcard]

Knock sensor output monitoring would be pretty useful..... that is quite cool.

[gt4mike]

Knock sensor output monitoring would be pretty useful..... that is quite cool.

You could do that with a voltage gauge for like $5 :/

[Wildcard]

You could do that with a voltage gauge for like $5 :/

Seems to have knock vs rpm etc on a realtime graph like the powerfc though..... thats slightly more useful

[anthonym]

Sort of makes sense also the gain in question was around 7% so really not that small!

Says who? Where is the dyno sheet? Please post it so we can all see, it sounds like a good gain but without the evidence it's just another "my mate" post.

[Loudtoy]

Ok i'l try but having issues getting my digital camera to arrive brought off trade me about 2 weeks ago transfered money same night but no sign as yet - i best not be getting ripped off! Untill then i'l see if i can get a photo of it with a phone camera so excuse the quality if i do get a photo soon!

PS will the proof of this make all the things i say about mates cars that you guys don't believe better??

[B1NZ]

We cant belive you cos in your sig it says I+E = 14.7

We all no you never run with an exhaust - LIAR!!
You need to put -E

[Lith]

Sort of makes sense also the gain in question was around 7% so really not that small!

Says who? Where is the dyno sheet? Please post it so we can all see, it sounds like a good gain but without the evidence it's just another "my mate" post.

I have seen the dyno sheet, and have made a healthy gain on an 2.2VTEC Prelude with an S-AFC with "conservative tuning".... meaning I could run comfortably with 98 on a hot day, and never experienced any issues running 96 either.

At the end of the day, any doubters could be as full of shit as anyone stating facts - so the person asking the question can draw their own conclusions from there. FYI, my conservative tune got me from 137kW @ wheels to 142kW @ wheels with gains of up to 10kW @ wheels between 5000-6000rpm - so the difference in peak power doesn't fully represent how much better the car actually went after the tuning.

I can't provide the dyno plot, though anyone who doubts and lives in Palmerston North are quite welcome to have a look at my torque, hp, and voltage (a/f) ratios for the tuning session... and there are 2 other people to can attest to S-AFC + tuning being a good thing, and 0 people who actually can state with examples any cases they are no good - so the gains must be real.

Considering a WOFable exhaust on an NA 4cyl typically gains about 2/3kW @ wheels and will typically cost several hundred dollars, this is a very logical bang for your buck modification - as it is cumulative to your mods.