[BMWcurious]

If you have DCT or auto and are full throttle through gear shifts, I would not expect the bypass valve to open. What does wastegate duty do through a gear change?

[sbrach]

What WGDC is your DV set to open? Stock is 65%. Boost does not spike for me during WOT shifts.
https://datazap.me/u/sbrach/rev-29-1st-4th-wot-uphill?log=0&data=3-11

[enemigo13]

Originally Posted by sbrach

What WGDC is your DV set to open? Stock is 65%. Boost does not spike for me during WOT shifts.
https://datazap.me/u/sbrach/rev-29-1...og=0&data=3-11

you mean "Tastverhältnis ab dem das Schubumluftventil öffnet
TVLDUVOS WGDC to Open Diverter Valve"? its left stock. You car is automatic? My is 8 speed auto.. One more problem I cannot get higher requested boost no matter how high I set torque limiters, RF limiters are set to 190, I get about 550Nm max, is it limitation from gearbox and time to decalibrate load to torque tables? (I don't like to do it as sport displays won't show correct values after it)

[sbrach]

I'm not really familiar with the German table names. Boost request is a function of load request. Are you targeting higher load? Have you increased your max WGDC and boost ceiling?

[sbrach]

Oh and mine is DCT.

[enemigo13]

OK, will try to use table names from 98G0B.xdf. boost multiplier ceiling (2.38 bar) left stock as it's enough for me. boost ceiling is left stock also (2.00bar) as its relative pressure, not absolute and its set to 2.0 bar even in M4 GTS software. Load ceiling is set to 190% all table, torque request ceiling all 3 are set to 620Nm max, 2 of modelled torque limits are also set to 620Nm max, boost limit multiplier all table to "4.0", WGDC limit to "100%", WGDC PID Adder Ceiling - all to "100%", load to torque limit tables are left stock.
All these settings were ok to make stage 1 with ~500Nm max, and stage 2 with 550Nm, but requesting more than that does not make ecu to request more boost, so probably I'm limited somewhere.

Originally Posted by sbrach

I'm not really familiar with the German table names. Boost request is a function of load request. Are you targeting higher load? Have you increased your max WGDC and boost ceiling?

[sbrach]

Yeah, maybe get a log with the tq limiter channels.

[sbrach]

FYI, it was confirmed on another forum that the WGDC to open DV parameter is not actually connected to WGDC. It seems just be for DV diagnostics so it doesn't look like raising this value is necessary.

[sbrach]

Started working on PID boost control today. Here is my first log with Commanded WG turned off. Looks like I have some work to do.



https://datazap.me/u/sbrach/rev-33-switched-back-stock-boost-control?log=2&data=3-11-17&solo=3

[enemigo13]

load to torque tables decalibrated, right? 185% load at 4200rpm and shows only 458Nm.

Originally Posted by sbrach

Started working on PID boost control today. Here is my first log with Commanded WG turned off. Looks like I have some work to do.



https://datazap.me/u/sbrach/rev-33-s...3-11-17&solo=3

[sbrach]

Yes, I haven't found what the actual limit is on DCT but I believe it might be 600nm. Shifts great with current L2T scaling though.

[Bomba474]

Dear,
I´m tuning a n55 135 DCT w/ IC, DP and MHD, but I cannot get more boost on rev limit than 11psi. When using jb4, I had 17psi on rev limit.

You can find log on link bellow:
https://datazap.me/u/bomba474/135-dt...=0&data=3-4-14

Anyone has na idea what is happening?

I´m increasing WGDC base, WGDC adder, PID adder and P-Factor, but from initial file loaded to actual, just increased boost 6psi to 11psi on rev limit.

PS: On Spool there is overboost, maybe caused by WGDC high values.

[sbrach]

At 100% duty cycle the most I can manage is about 14psi at redline, most of the time I only hit roughly 12psi. I have seen this same discrepancy vs JB4 logs although I have not run JB4 myself. I wonder if it is a difference in logging parameter values. For example, N54 has Boost Mean which is the average boost in the charge pipe measured by the TMAP and Boost PSI which is the calculated pressure in the intake manifold, not actually measured. A partially closed throttle will make these two numbers very different.

Maybe Justin or Martial can chime in and verify that the Boost logging channel is in fact the actual value from the TMAP and whether or not it is the mean value like on N54.

[Bomba474]

Originally Posted by sbrach

At 100% duty cycle the most I can manage is about 14psi at redline, most of the time I only hit roughly 12psi. I have seen this same discrepancy vs JB4 logs although I have not run JB4 myself. I wonder if it is a difference in logging parameter values. For example, N54 has Boost Mean which is the average boost in the charge pipe measured by the TMAP and Boost PSI which is the calculated pressure in the intake manifold, not actually measured. A partially closed throttle will make these two numbers very different.

Maybe Justin or Martial can chime in and verify that the Boost logging channel is in fact the actual value from the TMAP and whether or not it is the mean value like on N54.

Searching on web and related foruns, I found 2 tables that might fix it.... but I'll just test it on costumer's car on Monday...

KF_RFMAXATL_SK : Set all table to 200
Load target offset (overboost) : 4000rpm set all to 0.7 ; 5000 and above to 0.5. lowest rpm values row set on 1.

Using map6 and jb4, 1st and 2nd gear all the time TC actuating, on MHD it didnt happend, so the car is weak than JB4, right?

[enemigo13]

wrong, KF_RFMAXATL_SK is load limiter on superknocking event only, KF_DMDMX_OB will not help in your situation either, as its overboost table. Look at your - log ecu asks all the way ~190 load but gets near it only at 3500-4000rpm, then 140% at 5500rpm, 126% load at 6000rpm (while 190% is asked there). So probably 63% wgdc is not enough for a small stock turbo @ 6000rpm.

Originally Posted by Bomba474

Searching on web and related foruns, I found 2 tables that might fix it.... but I'll just test it on costumer's car on Monday...

KF_RFMAXATL_SK : Set all table to 200
Load target offset (overboost) : 4000rpm set all to 0.7 ; 5000 and above to 0.5. lowest rpm values row set on 1.

Using map6 and jb4, 1st and 2nd gear all the time TC actuating, on MHD it didnt happend, so the car is weak than JB4, right?

[bbnks2]

Originally Posted by sbrach

At 100% duty cycle the most I can manage is about 14psi at redline, most of the time I only hit roughly 12psi. I have seen this same discrepancy vs JB4 logs although I have not run JB4 myself. I wonder if it is a difference in logging parameter values. For example, N54 has Boost Mean which is the average boost in the charge pipe measured by the TMAP and Boost PSI which is the calculated pressure in the intake manifold, not actually measured. A partially closed throttle will make these two numbers very different.

Maybe Justin or Martial can chime in and verify that the Boost logging channel is in fact the actual value from the TMAP and whether or not it is the mean value like on N54.

Correct me if I am wrong, but the TMAP provides pressure and temperature feedback. The MAP sensor in the manifold calculates mass airflow, which is what the DME really cares about for calculating load (using TMAP temp and pressure data as well).

[Bomba474]

Originally Posted by enemigo13

wrong, KF_RFMAXATL_SK is load limiter on superknocking event only, KF_DMDMX_OB will not help in your situation either, as its overboost table. Look at your - log ecu asks all the way ~190 load but gets near it only at 3500-4000rpm, then 140% at 5500rpm, 126% load at 6000rpm (while 190% is asked there). So probably 63% wgdc is not enough for a small stock turbo @ 6000rpm.

So you suggest me to increase WGDC base values for high pressure target on rev limits?

[asrautox]

Originally Posted by Bomba474

So you suggest me to increase WGDC base values for high pressure target on rev limits?

Yes. You can also increase WGDC Adder (airflow) for the higher airflow requests. With the stock turbo, you’ll want 100% WGDC above 5500 or so.

[sbrach]

I'm at 100% WGDC above 5000rpm and down to around 13-14psi at 6500rpm. Stock turbo is just out of breath. This is with catless DP and full exhaust. Maybe some Vanos tuning could help some but I doubt much.

https://datazap.me/u/sbrach/rev35?lo...solo=3-4-29-30

[Guardian]

Originally Posted by sbrach

I'm at 100% WGDC above 5000rpm and down to around 13-14psi at 6500rpm. Stock turbo is just out of breath. This is with catless DP and full exhaust. Maybe some Vanos tuning could help some but I doubt much.

https://datazap.me/u/sbrach/rev35?lo...solo=3-4-29-30

Another issue that you will run into is that at that RPM and PSI, you are on the far end of the efficiency for the N55 turbo. You are coming close to hitting the choke point for overspin past 14 psi. Look at the IAT...it is rapidly climbing toward the end of the pull. Aftermarket IC or not, there is only but som much that little turbo can really do, and it just causes a loss in power after a certain point. Really, anything past 12psi at readline on the stock N55 turbo is going to be outside the efficiency range that will produce any more power.

[sbrach]

Agree 100%. Still on the stock IC but all an upgraded Ic is going to get me at this point is the ability to do a multi gear pull without IATs climbing so high I start hitting load reduction. VRSF 7" HD and PS1 is the plan after xmas.

[Bomba474]

Originally Posted by Guardian

Another issue that you will run into is that at that RPM and PSI, you are on the far end of the efficiency for the N55 turbo. You are coming close to hitting the choke point for overspin past 14 psi. Look at the IAT...it is rapidly climbing toward the end of the pull. Aftermarket IC or not, there is only but som much that little turbo can really do, and it just causes a loss in power after a certain point. Really, anything past 12psi at readline on the stock N55 turbo is going to be outside the efficiency range that will produce any more power.

In my mind I understand and agree, but I still dont understand why using JB4 boost hits 17psi on red line.... The car's owner said that with JB4 and not using BEF it has more power than with MHD and 12psi on red line....