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Old 16-07-2019   #46
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Re: Possible boost leak

Ok, I'v make a test. Unplug the connector and there is no difference. The air still goes through the hose when the peddal is pressed and rpms are above 2000 rpm. And even the rpms is low there is a vacuum at the end of the hose. That means the valve is always in open position. I think it is time to dismount the valve and check it visualy or maybe if it is possible even to disassembling it.
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Old 16-07-2019   #47
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Ok, so the valve is gone. The rubber spring that have to push valve in closed position is get soften and valve stays always open. I have ordered new one and hope everything is going to be ok.
I will write after install a new one.
Thanks again!
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Last edited by Deyan86; 16-07-2019 at 19:23.
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Old 18-07-2019   #48
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Re: Possible boost leak

So here are the result after changing turbo diverter valve.
Car now boost up to 1 Bar. Finally i'v feel the spirit of this car.
@aurick86 thanks for every helpful post!!!
I have some other questions now.
This graph is made at 3 gear from 1000rpm.
1.Is not the boost pressure too high? It goes up to 1.5 Bars. Were are the boost pressure sensor located, maybe at the pipe before hose that going to diverter valve?
2. When changing gears at 3000rpm or higher a hear this whistle noise from air going through turbo charger. That mean the compressed air can't goes fast enough through diverter valve. Is that normal or what?
I have some problem with attachment so here it is https://imgur.com/a/j20ClTu

P.S. And one more thing do I have to make Self adaptation and Phonic wheel learn reset after valve changing?
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Last edited by Deyan86; 18-07-2019 at 21:00.
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Old 18-07-2019   #49
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Re: Possible boost leak

@Deyan86
You need to compare "desired boost pressure" with "intake manifold pressure" (which are close enough to each other.)

The "boost pressure" value is the value of the boost before the throttle plate... basically the pipes from turbo to just before intake manifold.

I'd be interested in seeing another graph with desired boost, intake manifold pressure throttle %, and rpm. ("boost pressure" seems a bit to much...maybe throttle isn't 100% opened or there's another problem .... on the wastegate side.. solenoid.. or boost lines... or something there).




Play with the scale..and make the graph as big as possible. (now it's set at 10X).... not sure if you need to select 100x or 1x. Give it a try and make the graph show up wider on the page.
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Old 20-07-2019   #50
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Re: Possible boost leak

Quote Originally Posted by marracc View Post
Hi! I just want to confirm situation with boost cut. I had the same problem with my T-jet. Car was producing woooosshh nosie when throttle was fully pressed. Acceleration was poor after woooshh noise. I was thinking that some clamp is loose or something, but it wasnt. After running MES i saw that throttle is closing after boost rises to high. I have changed three way waste gate actuator and problems were solved!
Here is the graph:
http://uploadslika.eu/image/gmXas



I would like to put some tags for people with same problems, because i spend a lot amount of time to find this thread
Tags: boost cut, boost problems, wastegate, waste gate, differential valve, T-jet, tjet, 1.4 T-Jet, turbo noise, pressure converter, 46813571, bad acceleration, poor performace
Here is graph when three way waste gate actuator was changed, i think it looks ok, any comment is appreciated. I think that graph should look like this when everything is working as it should.
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