NefMoto

The file which I'm currently running in my 1.8t a4 is throwing an error for MAF signal to high intermittent. It only happens when bringing the car through its range or building boost in a high gear low revs. The traction control light come on when it logged the condition, that's how I know.
My guy who tuned the file says that the upper boost limit needs raised, but I think he has done this a few times already and it's still coming up.
Can someone give me there opinion if this is tuning related or do I need to start looking for a fault relating to the MAF.
Basically I'm running a tt/s3 225 setup.....

Please read the sticky in this section and post logs and LTFTs

check for leaks.

still got this maf fault and overboost, car is remapped so im guessing it is something to do with that.
16618 - Boost Pressure Regulation
            P0234 - 001 - Limit Exceeded (Overboost Condition) - Intermittent
16487 - Mass Air Flow Sensor (G70)
            P0103 - 001 - Signal too High - Intermittent

LTFT'S -0.4 & -12.5

WHAT WOULD NEED ADJUSTED TO STOP THESE CODES BEING THROWN AND STOP THE CAR FROM GOING INTO LIMP.

That log looks fine. You'll have to get a log of the car when it actually goes limp.

Yes that log is fine to the thanks of Dan's work.
Log of when it actually is in limp will just show no boost. It will follow.

If the  Maf is older than 5 years old or a cheap aftermarket MAF , you will get random fault codes. A cone air filter close to the Maf will cause high readings as well. You might not have a software issue rather a physical problem.

Lee

Standard air box and sensor is just over a year old, tho thanks for the info.  ;)

maybe wiring problem or KFMLDMX need to be adjusted??

yes the KFMLDMX i think also needs adjusted for the maf high code, but can't find it, orignal file im using attached.

It has been adjusted in just about everway i can and it still throws the error.

Its the same code you get if you dont increase mlmax but yet to find it on the a4 files. I have spoken with DD about this directly and still at a stump..

Whats odd is that adjusting dmx just either speeds or slows the rate the mil light comes on/off..
I thought maybe becuase the maps strangly defined in the bfb ols that it could be related but agsin various versions all cause the same problem, although never hit limp mode

Will I was just about to make my first edit but seams you have tried everything already so I'll leave it alone, until you can find out the solution.
Really I don't know if it's the maf to high  or upper boost limit code putting it into limp because both are being reported at the same time.

I will get a log done on my way to work 2night showing when the limp occurs.

Thanks for the info.

It'll be the upper boost limit, Maf signal too high won't throw boost at least on mine it didn't. I got the same codes but no limp which makes it more confusing..

also log ps_w, msdk_w

Stupid question: is it possible to throw a MAF code if msdk_w is far enough off from actual MAF readings?

Here is the log, something tells me its boost putting it into limp because the traction light did not come up like it usually does and then go off again.

log4 was the 3rd gear run  and the other one from dead stop when in limp.

thanks

From 6500 on your boost is uncontrollable. What turbo and wastegate?

Well, you have two logs: one before limp, one after, but neither WHEN it goes limp..

the only odd thing I can see is that in the first log, your actual boost does not come down up top even though the PID is cutting a LOT of DC.... is it possible your N75 is dead, or your wg lines are leaking?

Its a 225 k04 in a k03 turbine housing , wastegate is 12-14 psi.
Talk to Dan he will be able to give alot more detail than me.

ok, the first log is it going into limp and killing boost, second log when it's in limp.

Ill order some new WG lines tomorrow, i replaced the n75  earlier this year.

If you have time to look at line 264 in the csv, it cuts the throttle 50% thats were it goes wrong,

Actually i stand corrected looking again its closing the throttle, boost keeps on coming...

I think boost looks like its uncontrollable because its at that point the throttle is closing.

Ok, I'm new at this so take what I say with a pinch of salt, but is the problem not the airflow through the maf (200gm/s) plus puts this over the limit of the maf, in this ori anyway?
Larger maf required?

Just saying as I recently had a problem like this, bigger maf needed and scaling

Honestly don't know how true the theory of that is, but yes I've already got the bigger 225 maf housing and at a good guess it would be scaled correct.

Have you not checked the scaling then?

No, boost is uncontrollable because the ECU's wastegate control is doing nothing.

Entirely true I learnt this later because my WG dc control is maxed out, to allow the control of the stronger actuator, I'm told EDLDRP is the cause of the throttle cut because of the boost deviation. But is yet to be found to adjust.

You have changed things mechanically..... this is why you havery over boost issues!!!!!! . Stop messing with the car physically  and you might be able to make it run correctly. This forum can not help fix stupid. You need to learn about waste gate acuators and propper set up. If you go to tight ( too strong of a spring ) the problem you will run into is over boost issues.


Lee

You need to adjust the waste gate to 7 - 10 psi with a hand pump and then recheck it again. NOT 14 PSI ! .. No wonder you have overboost problems, you've messed with things too much and now you screwed yourself. A K0* turbo is no big deal . Maybe when you go to a Gt 28 or GT 30 or even a Borg Warner EFR turbo...then you set the wastegate higher ,not on a  K0x  series turbo. please do everybody  a favor and Google how to adjust a wastegate actuator on an Audi or Volkswagen.

Lee

Thanks for the input, I'm well aware of the mechanical setup of the car  and I Have checked and replaced all associated parts that I thought  may have  been causing any hint of a problem. For the WG actuator it don't need set it was checked with an air regulator 2 weeks ago it's an uprated one that the turbo builder fitted and I'm confident that he knows what he is doing!
People have been doing there absolute best to try and iron out my gremlins in the mapping of the car, to that I am extremely greatful.
if I knew what I was doing with the mapping side of things at this level I would be trying to work it out myself, but I'm only learning the basics in file tuning at this present time.

I'm telling you that 7 psi for full open wastegate actuator or the wastegate door. Again 7 psi at start to open and 10 psi AT FULL OPEN ON THE WASTE GATE DOOR.  THAT IS YOUR PROBLEM WITH THE OVER BOOST. I do this stuff ever day for a living ...... and no you don't use a air regulater to check the waste gate opening pressure !

Actuator rod length/preload needs setting correctly, do not use this to change wastegate opening pressure as Your just coil binding and reducing the wastegate opening amount

You can then change the spring rating in the actuator to change  the opening pressure from 7psi to 14psi etc

Ok, I would have thought surely using a hand pump or a mini regulator with a suitable range gauge is no different as long as your getting a pressure reading just as the waste gate starts to crack?
As for being fully open at 10psi that will not happen with my actuator as the spring is stronger to to ensure boost is held, hense the reason why my car mapped the way it is.


Everything you say is completely true and that is how mine is set with the stronger spring in the actuator and preloaded just enough as to not take away from stroke length. Thank you

The fact is you have over boost problems and i am telling you how to fix it .... Dont you think i have donre the same thing to my own first car ?? I did the same thing  your doing years ago .. many many years ago. I did the same stuff to my car you are doing right now and I had the same problems. The fact is, the acuator is too strong for the factory N75 and the hoses going to the N75 have to be 3/8" DIA. The suply hose going to the N75 has to come from the Turbo housing.... not the manifold.

The fix will be a Factory acuator . I have some WG acuators in my shop and you can have one for free if you want. The factory one does not cause boost creep or boost drop if adjusted correctly. I am trying to save you a lot of time a fustration .... the ball is in your court ...good luck


Lee

I 100% understand what you are telling me and have considered going back to a factory actuator in the past but a standard K03 actuator can struggle to hold 22psi. That's the reason for the stronger actuator.

Ok, how can you set 7-10 psi on a 14psi actuator? You can't the base pressure on a 14psi actuator with  0 DC is 14psi.. so telling him to set it correctly to 7 psi is just nonesense, No point in telling him what to do if its not physically possible to do it!

And the reason an uprated actuator is used is because the pressures inside the turbine housing blow the stock 7 psi actuator open, Ideally a flat based 10 psi one would have been used but it wasn't available at the time and TBH it wouldn't make any difference, whether you run 21psi at 30% DC or 60% DC it's still 21psi regardless of the base actuator pressure.

I can assure you even a new OEM actuator will not hold boost at high RPM on this turbo as the wastegate will be blown open...

Is the factory n75 being use ?

yes, wont make any difference as they are running perfectly happily at 350-400 bhp with no issues..

Issue is the A4 BFB maps aren't fully defined and therefore it is very hard to actually get it right, unlike the BAM me7.5 which i can happily make run 24psi boost with no issues.