I tried to use te Apexi Power FC with my new engine, but there are big problems making power, as it seems the MAF is on itīs end.
There are equallength headers, SR40 turbo and 3"DP with stock middlesection and STI rearbox. The engine is a EJ22T hybrid with STI V6 heads.
Now we mapped it to 1,7bar and it doesnīt make power after 5500rpm, power drops but boost stays on and on!
Is the MAF the problem, isnīt it able to deliver a signal to the Power FC...
The dyno showed 308bhp and 420NM, thatīs really bad for this spec!!!
Maybe there is a possibility to calibrate the MAF through the Power FC?
Please any advice would be more than great!

 

can you see what voltage the Maf is reading?

 

You need to scale the maf curve in the Apexi, this is a fairly early stage of the mapping process which your tuner should have done.
Which model year of maf sensor are you using ?

Andy

 

sounds more like restriction somewhere.. exhaust?

Simon

 

The MAF is selected and itīs a MY99/00 sensor.
The voltage reads 4.7-4.8 max at the moment when we go up to 1.3bar, that should be okay, but if we want to go any further a mapsensor is needed I think, as Iīve been told that the stock solenoid reads only 1.5bar, is this correct?!

The exhaust is resricting, thatīs right but I do not want to use the Trust 3"exhaust, due to tribute to legality in our country!
So I use the stock centresection - will be replaced with a 200zeller cat and the STI backbox will be replaced by a Laser backbox that goes straight through.

In the end I will never ever use this tuner again, as it seemed he hates Apexi and was not able to do a job as planned.
Now my mechanic did a safe setup on the rolling road and that works good so far.

Anyways I hope we can go forward in the near future, but I think a mapsensor is needed anyways as well as bigger injectors that the 440s.
Would 550s be enough?
I have got 720s but they seem to be quite to big!

Greets
Markus

 

SR40 show be okay with standard MAF sensor.. max voltage is 5.12v.

sounds like it is not going beyond 5500rpm due to injectors being out flowed..

I would go with 720s..

Simon

 

hi markus!

I thought you'd only build a 2litre

tztz now you have 2,2..

Who mapped the PowerFC? Korbel Racing??

I think it will be the best we get straight ahead to AndyF
Or we let him come to nice Austria
If you can wait a few months i'm ready for mapping Stage1!
What you think about Andy?

I've got another question!
Is it possible to have 2 maps saved on the power fc and switch between them (for example MAP1 with stock middle section and backbox MAP2 with Nurspec R Catback for Drag? (illegal and impossible here the policemen will kill me !?)
Let's see how mine does with 850cc
I don't think the injectors can be much too big, can't they?


Hope you solve your problems Markus until the 16th of Dec
Wish you good luck with it!
Ah btw engine is on the way to me got a tracking nr yesterday!
Hope I have it until 16th.. but I don't think so..

 

Never ever will I go to Korbel Racing again, they are bloody beginners on the Power FC and told me no problem we will do the job of course!

So you mean the 720s are not too big, Simon?!
I thought to use 650s, but the 720 are are in my trunk yet, so this would be the better way for me!

Hoping to be able to start next Sunday, but really do not know by now!

 

i asked Michi 5times if he can map my power fc and he always talked about Link, Motec etc.. they've never mapped a Power FC I think..
and a Link ECU costs very much..

We have here 3 guys using a PowerFC (RX7 FC3S, Skyline GTR R32 and me)we've got the FCDatalogit and all to get a good mapping..

A Power FC mapper will be great here in Austria!!

If I found a good guy who knows what to do I'll tell you!


Hope you'll get it done until next Sunday...

but take care not that your engine ends up in smoke..

 

Would you share the Datalogit for some time and of course a fair price as I do not want to buy this just for one mapping session and I hope I will one tune the car once and be okay with it!
Just give me a call, if you know about it, would be great!

Looking forward to get some more informations, what is wrong with mapping...

 

It's not mine..
it's my friends one.. don't know he talked about fitting in his FC if mapping of the Skyline is done!
But I'll ask him when we meet next time!

Maybe he comes with me on 16th Dec.. let's see..
Or maybe we both buy one? Don't know what's the actual pricing (300€?)
I'll have a look..

 

Allright, that would be interesting, could share one together thatīs an idea, too!

 

The 720's will be fine, Simon Mapped mine with 740's on Ecutek and they are no different to the 440's on Idle.

 

Great thanks for the information, so I think yours is an EJ20 engine, right?
What spec is you car? What turbo do you use and what kind of boost?

Oh I see, yours is a EJ25 with GT30 turbo, I think my spec with the EJ22 and SR40 can īt be even near this spec!

 

as long as the injectors are good quality then idle shouldn't be an issue..

Did a 2litre on a powerFC with 740cc injectors and an SR40 last month.. no idle issue.. went very well. Would have maxxed out 550s.

You cannot do two maps on the powerFC no.. you could use datalogit to swap maps though.

Simon

 

Thatīs great to hear, so the 720s are not overkill, even I think 640s are enough thou...but if you used them on a 2.0l it should be fine with my 2.2l too!

 

what make are the injectors?

Simon

 

They seem to be red Nismos with adapters.

 

they should be perfect then

 

Thatīs what I wanted to hear!

Now I found the following regarding replacing the stock MAF with a MAP sensor: Apexi PowerFC FAQ

Are Iīm able to use the MAP senor with my standard Apexi Power FC?
Do I have to splice any wires into the loom as well or does this only have to be done on RB26 engines?
Do I really need a MAP sensor or are Iīm okay with the MAF of my WRX?

Simon, did you tune the 2.0l/SR40 car with the stock MAF?

Many thanks for your help!!!
I really want to be prepared for all problems this time as my car is off the road for about 6 month now and I want to drive it on the track again!!!

 

nope that is skyline.. you have to use a maf or a maf simulator on the scoob pfc.

Yes on standard maf

 

I will try to use the stock MAF sensor for the moment, if you say you did it on the clients car, it should work on mine too, I hope!
There is a pin next to the handcontrollers output, thatīs the plug where the MAPwire will have to be connected, right?!

 

only if you use the boost control kit.. the standard map sensor input is via the loom

 

So it is perfect just to replace the MAF with a MAP and tell the Power FC that it has got a SuperMassAirflowMeter and all is done?!
If so itīs perfect, as I use the AVCR to control boost anyways!

 

no.. the boost control kit is instead of the AVC-R.. but AVC-R is better..

Mafsimulator is another ball park..

Simon

 

What do you mean?
I use the Power FC and choose MAP sensor on the menue to tell it, that I do not use the stock MAF any longer and the Apexi AVCR to control boostlevels.
Isnīt it that simple?
I do not use the boostcontrollerkit that is optional to the Power FC!

Please let me know your advice!

 

no it is not that simple... the maf measures the air entering the engine and is used to traverse the ignition and fuelling tables.. the MAP sensor controls the boost and boost cut level..

you click the boost control kit and use the AVC-R to control the boost.. you still use the MAF.

Simon

 

I don't know if I'm right but it's the D-jetro version of the PFC to use MAP sensor instead of MAF, isn't it?
But that version was discontinued for classic shape..

As I'm not a friend of the MAF (if it's dead your engine will be too and you don't know it..until it happens) and Subaru's MAFs don't get the best opinions..as they get damaged often.. (I had no probs since I have my classic one)

Anyway is it possible to change MAF to MAP?
My friend has got an FC3S and with his PFC he switched to MAP instead of MAF..

Or is MAF also a good choice? How much bhp will work with standard one (WRX or STi V4 MY98)