[b21playa]

can you push the rod anymore or does is rattle around on full boost?

Haven’t tried moving it by hand, only via pc or hand vacuum pump. If it can be moved, does it need adjustment?

Also logging actual v specified charge air, it’s miles out 1100 v 2600 at times. Red intercooler hose was replaced about 6weeks ago.

Could it be the changeover valve stuck open so all pressure it going through large turbo?

 

[dipone]

I went straight the the waste gate as IMO this would point me in which direction to work and start testing. If it closed fully on mine i would of worked from the first turbo to the second and that way as the first turbo should be spooling if its fully closed, unless the turbo had failed. My waste gate didn’t close fully so i started from there working back. Also i think (could be wrong I’m no expert) it also shown me if it was vac issue and not boost issue

 

[b21playa]

I went straight the the waste gate as IMO this would point me in which direction to work and start testing. If it closed fully on mine i would of worked from the first turbo to the second and that way as the first turbo should be spooling if its fully closed, unless the turbo had failed. My waste gate didn’t close fully so i started from there working back. Also i think (could be wrong I’m no expert) it also shown me if it was vac issue and not boost issue

Managed to spend a few hours on it today. Couple of broken cables to oxygen sensor replaced, vac lines checked again and still the same. Got ista/d up and managed to actuate the pressure convertors and changeover valve to see if they were working, which they all were. Pulled vacuum in small turbo actuator and tried moving it by hand, but no further movement., still no low down power.

Eventually connected gauge inline with output from 1st pressure convertor and took the car for a drive, it was constantly pulling a vacuum of 25uG until top of the rev range. Decided to unplug the boost pipe to the actuator and car ran much better, not 100% but definitely an improvement. Seems like it was always open, which I’m guessing is incorrect.

I do have a fault code for oxygen sensor which I will replace and thinking of ordering a genuine pierburg pressure convertor to see if that works.

 

[b21playa]

Can someone confirm the following about the actuator road for the small turbo.

When the car is started it moves, is this closing or opening the flap? And then should this state stay until high rpm when it goes in the opposite direction?

 

[Jake13]

You may have already seen these?

 

[Jake13]

 

[b21playa]

I’ve tested the mechanical valves and all move and hold vacuum. Electric switch over valve was functioning correctly as well. Using ista I activated the 2 pressure convertors which then pulled correct vacuum, but not sure it they are 100% as they can not be tested so I’ve just ordered a new one from bmw.

I was trying to work out at what rpm what each of the mechanical actuators should be doing to see if that helps pinpoint issue

 

[Jake13]

I’ve tested the mechanical valves and all move and hold vacuum. Electric switch over valve was functioning correctly as well. Using ista I activated the 2 pressure convertors which then pulled correct vacuum, but not sure it they are 100% as they can not be tested so I’ve just ordered a new one from bmw.

I was trying to work out at what rpm what each of the mechanical actuators should be doing to see if that helps pinpoint issue

Is there anything in ISTA telling you what the pre-load values of the turbine control valve (#2) and compressor bypass plate (#6) are?

Setting the TCV is more complicated with LCi than pre-LCi engine......

https://www.newtis.info/tisv2/a/en/...2/a/en/e90-335d-lim/repair-manuals/11-engine/11-65-charger-with-control/PItOOKl

 

[b21playa]

Is there anything in ISTA telling you what the pre-load values of the turbine control valve (#2) and compressor bypass plate (#6) are?

Setting the TCV is more complicated with LCi than pre-LCi engine......

https://www.newtis.info/tisv2/a/en/...2/a/en/e90-335d-lim/repair-manuals/11-engine/11-65-charger-with-control/PItOOKl

I don’t think the tcv needs adjusting, when the car is started it is pulled and had no additional movement by hand. Ordered new pressure convertor from bmw which I should get Saturday. Will see if that sorts issue.

Had read somewhere that egr pressure convertor was causing issues for someone. Wonder if I can get to it without takin inlet manifold off and check engine mount switchover and pipes

 

[martin335d]

not sure this is the same thread, but vacuum lines for EGR solenoid are wrong on REALOEM.....the the hoses to the inlets on the solenoid connect the other way around and it applies for all 35d engines on REALOEM...

 

[b21playa]

not sure this is the same thread, but vacuum lines for EGR solenoid are wrong on REALOEM.....the the hoses to the inlets on the solenoid connect the other way around and it applies for all 35d engines on REALOEM...

Haven’t looked at egr one yet, I’m guessing manifold need to come off, but also this hasn’t been touched and power has dropped

Just had a look at realoem and can see it’s wrong for egr, but looks correct for other 2 pressure convertors

 

[Jake13]

1) Direction of travel
2) Vacuum supply, swirl valves
3) Vacuum supply, engine mount
4) Vacuum supply, exhaust gas recirculation
5) Vacuum supply, compressor bypass plate and turbine control valve
6) Vacuum supply, wastegate valve

Operating ranges

M57TU TOP and M57TU2 TOP: Up to 1500 rpm (low load and speed)

Item Description
1 Engine
2 Small turbocharger
3 Turbine control valve
4 Large turbocharger
5 Wastegate valve
6 Exhaust
7 Fresh air
8 Compressor bypass plate

M57TU2 TOP: Between 1500 rpm and 3000 rpm (medium load and speed)
M57TU TOP: Between 1500 rpm and 3250 rpm (medium load and speed)

M57TU2 TOP: Between 3000 rpm and 3500 rpm (medium load and speed)
M57TU TOP: Between 3250 rpm and 4200 rpm (medium load and speed)

M57TU2 TOP: More than 3500 rpm (high load and speed)
M57 TU TOP: More than 4200 rpm (high load and speed)

 

[b21playa]

That does help. So when vacuum is applied to the turbine control valve, I’m guessing it’s closing it?

 

[b21playa]

It would be good if there were specs to show what vacuum should be pulled at TCV, wastegate and compressor bypass plate at the various rev range as this would help diagnosis.

Checking vacuum coming to the pressure convertor i get around 25ug, but after the convertor to TCV on idle it was very little but enough the move the rod.

 

[jmccoy555]

Hi All...... First time using ISTA+ and I can only find the test for the turbine control valve, which appears to work fine..... how do I get to the test for the wastegate and compressor bypass plate?

I'm pretty sure my compressor bypass plate isn't operating. I have tested with a hand vacuum and I can hear it click open and close, and it holds a vacuum. I've also tested the EL valve which holds a vacuum and operates when a voltage is manually applied, I just don't think this is happening when its on the car as I don't see a vacuum on the output when at idle. I think this is correct as it should be closing the bypass plate at this point? If someone confirm that also it would be great.

Thanks.