[TDIwyse]

One comment on TestO reported EMP and Boost: These are "absolute" pressures, which include normal atmospheric pressure. If you want to see gauge pressure, which is what most boost gauges report, you'd want to subtract off your atmospheric pressure (~1000mBar at sea level under "normal" conditions... the car reports a parameter for the atmospheric pressure but I don't recall what it is off the top of my head).

[victorhall]

Originally Posted by TDIwyse

One comment on TestO reported EMP and Boost: These are "absolute" pressures, which include normal atmospheric pressure. If you want to see gauge pressure, which is what most boost gauges report, you'd want to subtract off your atmospheric pressure (~1000mBar at sea level under "normal" conditions... the car reports a parameter for the atmospheric pressure but I don't recall what it is off the top of my head).

AH! That makes a LOT of sense. The numbers seemed insanely high to me - and knocking approximately 14.7 psi off brings the boost down to Earth. I'll dig around for the atmospheric pressure parameter for the next time I log, but feel free to remind me if you come across it! And as I ponder that question, I'm wondering what sensor might measure that and how...

Thanks for the continuing education!
-Vic

[TDIwyse]

Originally Posted by victorhall

AH! That makes a LOT of sense. The numbers seemed insanely high to me - and knocking approximately 14.7 psi off brings the boost down to Earth. I'll dig around for the atmospheric pressure parameter for the next time I log, but feel free to remind me if you come across it! And as I ponder that question, I'm wondering what sensor might measure that and how...

Thanks for the continuing education!
-Vic

Thank DWR for these tranlsations: http://www.e90post.com/forums/showpo...&postcount=175

[victorhall]

Originally Posted by TDIwyse

Thank DWR for these tranlsations: http://www.e90post.com/forums/showpo...&postcount=175

Those have been a GODSEND. Every time I mess with this stuff is a reminder of four wasted years of high-school German...

[victorhall]

For posterity's sake, I believe I found the atmospheric pressure parameter as:
STAT_UMGEBUNGSDRUCK_WERT

Haven't tested yet, but will be tearing down the street soon for my test-drive. For science. I speed for science. You're welcome Einstein.

-Vic

[victorhall]

Ok, another take at it.
Latest run has the correct exhaust pressure parameter, and is corrected for atmospheric pressure.

[TDIwyse]

Originally Posted by victorhall

Ok, another take at it.
Latest run has the correct exhaust pressure parameter, and is corrected for atmospheric pressure.

Looks like your turbines are switching. But the EMP's (and boost) are really low once the LP turbine is engaged. I'd guess your compressor bypass isn't switching or your LP turbo is damaged... but I have no firsthand knowledge diagnosing an issue like you are having. Yozh has had much more experience in diagnosing issues like this ... hopefully he can re-address the situation with the latest full EMP data.

You can pull the intake boot (filtered air pipe ... #3 in link) and gain access to the LP compressor wheel to inspect.

https://www.realoem.com/bmw/enUS/sho...diagId=13_1191

If you pull your DPF you can gain access to the LP turbine (this is much more involved than the process to look at the LP compressor).

Please let us know what the diagnosis is when you get this fixed.

[Yozh]

Victorhall, definitely look at the air side of the low pressure stage. That is your compressor bypass and it's controll. Turbo switchover should also be checked.

[victorhall]

Thanks!
Got pics of the LP turbo (big one) at the inlet. FYI - this is an X5, not an E90, but the major parts are all the same.
I don't see anything that stands out, other than really dirty compressor blades. It does spin freely. Will take a closer look at the bypass valve, but for now it's bed time.

[victorhall]

Any thoughts on the operation of the turbine control valve:

This is through Rheingold. It's supposed to actuate in 1s, and move 25mm. Looks sluggish to me, but I have hard time being objective, since I want this to be faulty versus a bad LP turbo.
Thoughts?

[Owen81]

You are stock tuned with DPF and EGR removed?
I'm no expert but I thought the stock tune went into limp mode with the DPF removed?

[victorhall]

Originally Posted by Owen81

You are stock tuned with DPF and EGR removed?
I'm no expert but I thought the stock tune went into limp mode with the DPF removed?

Hhhmmm...not sure, but I thought no. Kicker is that the boost data clearly shows a problem that lines up with 429A code...and I don't think the DPF/EGR delete could cause those. Please jump in and correct me if I'm wrong though -
I'm always learning!

[TDIwyse]

Originally Posted by victorhall

Any thoughts on the operation of the turbine control valve:
...
This is through Rheingold. It's supposed to actuate in 1s, and move 25mm. Looks sluggish to me, but I have hard time being objective, since I want this to be faulty versus a bad LP turbo.
Thoughts?

I think that looks pretty good. The "slow" release action would be much better in a dynamic/aggressive fueling condition because there would be a large amount of EMP"pushing" the valve down and making it release faster. For example, compare your EMP at idle where this test is done versus your full fueling log where the EMP is dramatically higher.

I think the previous comment about deleting the DPF and not having a DDE remap to account for that could very likely be the problem.

Another thing to log that might give insight into what's going on, would be to look at the fueling parameters and see if the DDE is defueling. Lowering the fuel lowers exhaust energy which lowers EMP's which lowers boost...

STAT_EINSPRITZMENGE_AKTUELL_WERT would show you if the car is pulling fuel...

[victorhall]

Thanks as always for the input!
I had some "old" data where I logged the injection quantity, but only had boost levels, but it looks like a pretty steady injection amount, even through the boost drop event. Any thoughts?

[TDIwyse]

Originally Posted by victorhall

Thanks as always for the input!
I had some "old" data where I logged the injection quantity, but only had boost levels, but it looks like a pretty steady injection amount, even through the boost drop event. Any thoughts?

Well, your injection amount definitely decreases when the turbo's transition, so the lower fueling could be part of it ... but if your lambda (Air to Fuel ratio) is low and you're smoking a lot, then the reduced fueling is likely because the amount of air in the system can't support any more fuel ...

If you've deleted the DPF and not done a proper DDE remap, then all of this discussion is likely moot. I'd suggest you do a remap from a reputable vendor so the DDE is adjusted for the lack of some key components that an OEM DDE is trying to work with...

[victorhall]

Hello all!
Just wanted to give an update. After all this community has been very helpful, and I hope I can document a resolution.

The actuator moves sluggishly when I give a little counter-pressure, so I'm really hoping that it's the culprit. Thought it might be software, but the dramatic drop in pressures makes me think it's hardware.

I've got a replacement actuator on order, will replace, and report back!
-Vic

[Yozh]

Replace the vacuum lines, test EL valves and vacuum actuators while you are there. Careful not to break any of the plastic nipples, cut the hose off along a nipple. I've posted a few YouTube videos in the past.

[pheno]

Hey guys!

On behalf of a DDE 7.3 U.S. driver asking is there a parameter for wastegate?
And what about turbine by-pass valve?

Thanks.

[Yozh]

Turbo bypass output duty = IALDS
Compressor Bypass Position Status = CByVlv_st

The above two work perfectly.
The wastegate I only found: ExhFlpLP_rPs
It gives me data but I have not tested it enough to be 100% sure.

Pheno, while I got you here. Sometimes my TestO crashes. It happens when I try to do playback of a custom job with more than 10 parameters. Is it the reason. My TestO version is of Jul 2016 standalone.

Thank you.

[pheno]

Originally Posted by Yozh

Turbo bypass output duty = IALDS
Compressor Bypass Position Status = CByVlv_st

The above two work perfectly.
The wastegate I only found: ExhFlpLP_rPs
It gives me data but I have not tested it enough to be 100% sure.

Pheno, while I got you here. Sometimes my TestO crashes. It happens when I try to do playback of a custom job with more than 10 parameters. Is it the reason. My TestO version is of Jul 2016 standalone.

Thank you.

Thanks Yozh. Yes I can look at the problem. I have to try to reproduce it on my local env. Could you send the log files to me or attach here please ? I'd need the both files .csv and .info.

[Yozh]

Pm me your contact info.

[pheno]

I'm wondering if my charge air temp sensor is faulty. Should the charge air temp change more during wot. It seems there is only a few degrees (Celcius) change.

Here's screenshot. You can see Charge air temp on the bottom right, it stays almost the same even during acceleration. And there's weird bump from 33C to 42C.

Sensor faulty ? I got no codes however