Super AFC on a SR20DE

[pche059]

Does anyone here have a Super AFC (Apex i ) ?
I have just got one and have no idea of how to tune this little thing.
Lean it all the way?

[G22DET]

go ahead...if you want to blow up your motor... In other words, find a place with a dyno to tune it right mate! i have the AFC on my P11 and so does Tony (ty423)
the AFC, depends on how you tune it, can be quite useful.

[pche059]

Haha
do you think the unit is doing much for you?
power wise?
coz i wanna dyno tune it after i have got my exhaust done...
at the moment i just wanna have a play with it....
but have no idea how it should be set up...
I have only got the air filter done up...

[G-Forces]

He like Luke said. If done right it can make a difference. If you don't know what you're doing I'd just leave it alone or you'll have to start saving for a new engine. I'd also be very careful leaning out your a/f ratio. That is what kills motors.

[kenchan]

concidentally, I installed a VAFC on my lude last night. damn, extreme difference using the vafc. liking it a lot. i wouldn't lean it any more than -5% on the a/f ratio unless you have a dyno and all the experience. hondas are set pretty rich at the factory, so leaning it out -5% only balances everything out. i might lean it another 2% around 3k RPM just to punch out more torque...but again, I heard riching it improves torque. i have to play with it alittle and remember to reset the ecu every now and then.

for my p11, not sure if I need it. probably just keep it stock and go nos.

[pche059]

Well does anyone here know a basic idea where in my engine rev and how much i should lean/rich it just with an K&N air filter installed on a 99 p11 (96kw) SR20DE?

[T4 Primera]

Originally posted by pche059
Well does anyone here know a basic idea where in my engine rev and how much i should lean/rich it just with an K&N air filter installed on a 99 p11 (96kw) SR20DE?

I can understand how you'd be tempted to start playing around the new AFC.....but it seems the right way and safest way to get the best out of it is to do it on a dyno with a gas analyser. IMHO It's not worth the risk of trashing your engine over if it should accidentally lean the mixture out too much. I think you might find good gains at the top of the rev range coz IIRC I've read somewhere that the fuel maps flatline beyond 6500 or 6800 rpm. I suppose you could try richening it safely at these high rpms if you really want to try something out.
I always thought that the stock ECU used the O2 sensor to get the mixture right anyway and that the ECU would only try to oppose anything you tried to change regarding mixture... unless the AFC modifies the O2 sensor reading in some way. I'm just guessing now so I'll shutup

[P10DET]

Originally posted by T4 Primera
I always thought that the stock ECU used the O2 sensor to get the mixture right anyway and that the ECU would only try to oppose anything you tried to change regarding mixture... unless the AFC modifies the O2 sensor reading in some way. I'm just guessing now so I'll shutup

No, I'm 98% certain you are correct. What I've heard from Mike Kojima is that the AFC and the ECU fight for control, each trying to undo what the other is trying to do. For sure the AFC screws with the self learning function of the ECU.

That is yet another reason to get a remapped ECU if you can, rather than use the black boxes.

There is a lot more information about this in the SE-R Mailing List archives. Mike went into it in more detail.

I would search using: Kojima ECU AFC (just for starters)

[kenchan]

hehe,with only a drop-in air filter, I would leave it stock.