[TDIwyse]

Originally Posted by GottaBeKD

That is the first time I see desired vs actual boost graphed. Thanks for this TDI.

I am assuming you have the stock intake. If so it is doing a good job keeping up with demand.

You're welcome. I've posted this type of info many times. For example back in the DPF delete thread many months ago (also includes IAT's as well): http://www.e90post.com/forums/showpo...&postcount=701

Also posted some data here on the EGR beheading thread: http://www.e90post.com/forums/showpo...33&postcount=7

Yes, OEM intercooler. But an AEM filter with homemade intake (mainly for space savings to fit my catch can). Also, the EGR has been beheaded on the data in this thread and the last link above, but the DPF thread link data had the EGR valve in the stream and there was no observable benefit to power by removing it (but it does completely eliminate post injection events...) because the closed loop system can get all the air it wants and inject all the fuel it wants. I haven't seen any data that supports the idea that having a bigger intercooler would in anyway help my system.

Axle, the data here was collected using the Bavarian Technic tool, which has access to more than I can see with my blue tooth OBD dongle setup. So you'll be able to see some good and useful data, but not some of the things in the above graphs.

[TorqueAddict]

Originally Posted by TDIwyse

Took some data this weekend that might be helpful. In the Bav Tech tool there's data on the Boost Pressure Actuator (BPA) as well as the "desired" boost the car wants and the "actual" boost it's measuring. I've posted the Desired/Actual before, but this time I captured it along with the BPA behavior.

This for a 3rd gear full skinny pedal pull on a ~68F day with low humidity. Not sure if this is something that's useful to you, but I hadn't seen someone post the BPA behavior for this kind of situation.

TDI, do you have any idea if these parameters are available to log using Torque app?

[iaknown]

Thanks again tdi. Good to see what a proper boost graph looks like.

What is called "boost pressure actuator" here is actually the turbine actuator signal that switches airflow from the small turbo to the large turbo right around 3000 rpm. Unfortunately this is incorrectly labeled among every scan tool I have seen so far. I need the wastegate signal and have yet to find a scanner that can read it. Thanks for posting this though.

[iaknown]

Originally Posted by TorqueAddict

TDI, do you have any idea if these parameters are available to log using Torque app?

If we can find out the PID for the actual and requested boost we should be able to record/plot in Torque. My VCDS shows it as 115 if I remember but that does not work in Torque. I believe Torque wants hexadecimal or something last I looked....

[iaknown]

Just checked.... PID # for boost is 112, maybe this will help someone get it working in Torque

[TDIwyse]

Originally Posted by iaknown

... I need the wastegate signal and have yet to find a scanner that can read it. Thanks for posting this though.

I was looking for anything called "wastegate" and didn't see anything. Sorry.

[iaknown]

Originally Posted by TDIwyse

I was looking for anything called "wastegate" and didn't see anything. Sorry.

No problem, thanks for looking into it and your help so far with this...

[spaniard]

A friend got the same code P02CA with DPF removed. So is it the IAT sensor from intercooler?

[iaknown]

Originally Posted by spaniard

A friend got the same code P02CA with DPF removed. So is it the IAT sensor from intercooler?

Nope, it's probably the tune. Who is his tuner?

[Hoooper]

So is the consensus from this thread that a 428B code can be explained by any one of the below:

1) You have a bad vacuum hose
2) The MAF is bad/dirty
3) Problem with the tune

Im getting this code now, trips to reduced power mode at about 80 mph under heavy boost and it happens every time. I dont have a tune so Im pretty sure its not that, hopefully a cleaning of the MAF solves it.

[iaknown]

Originally Posted by Hoooper

So is the consensus from this thread that a 428B code can be explained by any one of the below:

1) You have a bad vacuum hose
2) The MAF is bad/dirty
3) Problem with the tune

Im getting this code now, trips to reduced power mode at about 80 mph under heavy boost and it happens every time. I dont have a tune so Im pretty sure its not that, hopefully a cleaning of the MAF solves it.

I think you're on the right track. If cleaning the MAF doesn't solve it pull the IAT and clean that. IAT is compared against MAF temps and used in airflow calculations if I remember correctly. Easy enough to do...

[aaddam2]

thread revival, I received the P02CA code when on track this weekend. I seem to have more luck in the rain (maybe cooler temps) but also was able to trigger limp mode again when laying into 4th gear out of a corner into a straight (when i should have been in 3rd) so WOT through about 2.8 to 4 rpm before causing limp mode. did notice that i almost always went into limp mode when in 4th gear going down the straights. any help would be appreciated!

[Lambobimmer]

Originally Posted by Hoooper

So is the consensus from this thread that a 428B code can be explained by any one of the below:

1) You have a bad vacuum hose
2) The MAF is bad/dirty
3) Problem with the tune

Im getting this code now, trips to reduced power mode at about 80 mph under heavy boost and it happens every time. I dont have a tune so Im pretty sure its not that, hopefully a cleaning of the MAF solves it.

I am wondering if you remember what you did to fix this code. I am getting the same code in the same situation. X5d will go into limp mode when going 80+ in WOT situations.

All of my vacuum hoses are new, MAF is new and tune is Malone 2.9. I don't believe that this issue is tune related. I cleaned the boost pressure sensor tonight and the IAT sensor is also new because I broke one of the prongs on the original sensor when removing it. I bought an OE sensor and not a BMW brand sensor so maybe this new IAT sensor is bad and not reading correctly.

[Nadir Point]

Originally Posted by aaddam2

...did notice that i almost always went into limp mode when in 4th gear going down the straights. any help would be appreciated!

Are you talking about the big, amber engine icon that pops up in the middle of the cluster with an "engine malfunction" message on the NAV screen?

[aaddam2]

yes, but resolved because i just went away from the mc-chip tune and now use the more conventional JR2.8

[robnitro]

Mc-chip was a plug in tune? If so that explains it... Those plug in boxes fool the rail pressure readings to the dde which can cause confusion in calculations.

[Lambobimmer]

I am getting this code with a Malone 2.9 tune. I don't think that it is the tune related and it is something mechanical. I suspect that either my IAT sensor or boost sensor is bad.

Basically, when I go WOT at 80+ mph it will trigger this code and my X5 will go into limp mode until I erase the code.

[Nadir Point]

My car with JR 2.7(?) does the engine malfunc under moderate to hard fueling in lower RPM range for more than a few seconds when the small water meth nozzle clogs. It's high EGT from over-fueling. Maybe not what's happening to you, but it sounds suspiciously similar. You might consider logging EGT if you don't find something else.

[aaddam2]

Originally Posted by robnitro

Mc-chip was a plug in tune? If so that explains it... Those plug in boxes fool the rail pressure readings to the dde which can cause confusion in calculations.

no it was a bench tune, they are a reputable tuner in germany, but i think it was due to their tune being based on the euro 335d vs US model with it's subtle differences the tune didnt like it.

[Dawe_a]

any solution on this? My car has the same problem 428B and 41AA codes, limp mode at high speed when full throttle. (~200km/h) has new vac lines, MAF, vacum checked on idle and while driveing, 2x new Pressure converters, all turbo acuators works and holds vacuum.

New MAP sensor is on its way, but i dont know... I have been to two different tuning companies and had 3 maps tested, all the same error.

DPF off, EGR off, Swirl flaps OFF stage 2

[zack9r]

Originally Posted by Dawe_a

any solution on this? My car has the same problem 428B and 41AA codes, limp mode at high speed when full throttle. (~200km/h) has new vac lines, MAF, vacum checked on idle and while driveing, 2x new Pressure converters, all turbo acuators works and holds vacuum.

New MAP sensor is on its way, but i dont know... I have been to two different tuning companies and had 3 maps tested, all the same error.

DPF off, EGR off, Swirl flaps OFF stage 2

Sorry to ask this 3 years later, but did you ever figure this out?

[coco35d]

Zack9r

Have you mange too sort it out

I have same problem at 120mph car goes into limp mode
Codes
428b
447B