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Old 20-09-2018   #31
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Re: Possible boost leak

That looks good.
Throttle staying opened as long as the accelerator is pressed, boost is controlled, not going over 2000mbar (2bar=1 atmospheric +1bar boost).


Fiy:
-you were hiting "boost cut".
-"overboost" is something else. In this case it's programed into the ECU, it gives you a bit more torque for a few seconds.
-you can see the overboost hump on the graph.



If you still get the whooosh sound, it might be a boost leak....no way around this....you need a
To make a boost leak tester(youtube mcm or jafromobile have some nice videos about this), a smoke machine might not be enough.
Thanks marracc thanked for this post
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Last edited by aurick86; 20-09-2018 at 06:24.
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Old 20-09-2018   #32
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Re: Possible boost leak

Ok I’ve got you now, might try the test again with sport mode on and compare.

I should add that I’ve installed a gsr induction kit at the same time, the noise seems to be originating from this area plus the whooshing is only there on partial throttle/ low rpm. Are induction kits known to make these sorts of noises? There’s a rather big cone filter on the end of it.
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Old 20-09-2018   #33
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Re: Possible boost leak

Yes it is known.

The stock airbox is very good and the filter is enormous. I wouldn't change it.
You might be interested in this:

The noise you're hearing is probably a combination of the bypass valve and the turbo itself.
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Old 03-02-2019   #34
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Re: Possible boost leak

hi guys, im new to the forum.

ive had my EGR cleaned but the guy recommended i replace the EGR so i have ordered a new one.

the car lags every time i shift gears, turbo kicks in after 1500 or so.

i have notice a leak near the turbo pipe and looks fresh, also notice another pipe corroding.

any suggestion to what the pipes are called or how to tackle the problem???
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Old 07-07-2019   #35
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Re: Possible boost leak

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
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Last edited by marracc; 07-07-2019 at 12:37.
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Old 07-07-2019   #36
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Re: Possible boost leak

Hello! I have just thinking to post a new thread, but find this one. I am a fresh owner of Bravo 198 1.4 T-Jet 120 hp, and i have similar problem with my car. I would be very thankful if @aurick86 or someone else can check my MES graphs from today. There is no strange noises or whistling form engine bay, maybe only quiet noise from oil segregator. I have not trying anything yet like cleaning or bypassing parts.
Thanks!



P.S. Forgot to check something. The seller tells me that the turbocharger was been changed (don't know for sure is it true), and now my turbo is stamped with TurboRail sign at the cold part. What should have to be the original turbocharger?
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Last edited by Deyan86; 07-07-2019 at 23:34. Reason: forgot
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Old 08-07-2019   #37
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Re: Possible boost leak

Turborail is a good chinese turbo. I had one for 35k km and made over 190hp.

Think the problem you have is the install. More specifically the wastegate solenoid. Post a few pictures of it, so i can figure out where the hoses are connected.
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Old 08-07-2019   #38
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Re: Possible boost leak

Thanks for fast response!
Here are some pics from solenoid.
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Old 08-07-2019   #39
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Re: Possible boost leak

That is connected right. I have clamp on intake pipe/turbo connection on my GP T-jet, i cant see it at yours. Put a clamp on hose if you dont have it on... Also I red in one thread that broken oil separator may create boost problems, try to find it if you said that some noise is coming from your oil separator...
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Last edited by marracc; 08-07-2019 at 18:33.
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Old 08-07-2019   #40
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Re: Possible boost leak

Quote Originally Posted by Deyan86 View Post
Hello! I have just thinking to post a new thread, but find this one. I am a fresh owner of Bravo 198 1.4 T-Jet 120 hp, and i have similar problem with my car. I would be very thankful if @aurick86 or someone else can check my MES graphs from today. There is no strange noises or whistling form engine bay, maybe only quiet noise from oil segregator. I have not trying anything yet like cleaning or bypassing parts.
Thanks!



P.S. Forgot to check something. The seller tells me that the turbocharger was been changed (don't know for sure is it true), and now my turbo is stamped with TurboRail sign at the cold part. What should have to be the original turbocharger?


The solenoid is connected correctly.
(the solenoid can still be broken internally, mechanically ...so no error)

Is the wastegate closed? can you move it by hand? make sure it's not hanging up on something.

How did you make those graphs?
(they need to be done in 3rd gear with car in motion) Turbos need load to make boost.

The oil segragator can leak boost... but can easily be tested by blocking off the hose going from segragator to intake manifold.
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Old 08-07-2019   #41
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Re: Possible boost leak

Thank You guys!
@marracc yes I don't have clamp on that pipe and will put one on it. About the segregator I think to check and clean it but want to collect some more information about turbo cars, because this is my first one with turbo.

@aurick86 i will check the waste gate movement.
About graphs, I have made two runs - first at 3 gear , and second at 4 gear. Just not have been sure which is right.
If the test with segregator is reliable i will try it before dismount and clean.

And again BIG thanks for help
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Old 08-07-2019   #42
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Re: Possible boost leak

Quote Originally Posted by Deyan86 View Post
Thank You guys!
@marracc yes I don't have clamp on that pipe and will put one on it. About the segregator I think to check and clean it but want to collect some more information about turbo cars, because this is my first one with turbo.

@aurick86 i will check the waste gate movement.
About graphs, I have made two runs - first at 3 gear , and second at 4 gear. Just not have been sure which is right.
If the test with segregator is reliable i will try it before dismount and clean.

And again BIG thanks for help
First try with clamp, before dismounting separator. Plastic clips on separator may break when you try to open it, so be careful.... I broke mine while trying to open and clean it, so i bought a new one....
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Old 13-07-2019   #43
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Re: Possible boost leak

Ok guys i found the problem, but not sure how to repair it.
I'v attached two pictures of the pipe from which when turbo makes some pressure the compressed air goes back before the turbo. I don't know which sensor or valve commands when compressed air goes through this bypass pipe.
When closed this pipe and make a run with MES, it shows higher values of boost, something like 3000 rpm -> 1750 mbar, but also car gives an error P0039 - Turbo vacuum valve.
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Old 14-07-2019   #44
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Re: Possible boost leak

Hi again. I found that is the turbo diverter solenoid valve. And if it is a electrical controlled valve is there a way to check that the problem is from it?
Thanks!
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Old 16-07-2019   #45
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Re: Possible boost leak

The hose you plugged up is from the turbo diverter valve.
It's electronically controlled. it's normally closed (no air coming through that hose). it opens up on throttle lift-off or when the ecu detects overboost error states.

Try unplugging it's connector, see if it closes.... if it closes than it's an electric issue(complicated), if it doesn't it's the valve needing replaced.
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