NefMoto > Technical > Tuning > Pressure drops at high RPM
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Author Topic: Pressure drops at high RPM  (Read 16891 times)
fknbrkn
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mk4 1.8T AUM
« Reply #15 on: December 08, 2013, 03:28:43 AM »
Quote from: prj on December 08, 2013, 02:10:39 AM
Rule 1: before you tune ANY turbocharged car, you pressurized the entire system with a compressor at the MAF->Turbo hose (preferrably bypassing PCV).
You have not done this yet? GTFO the forum and make sure Rule 1 is checked correctly.

Any time you skip Rule 1 on a mass-flow ECU you will just waste your time and your tune will be worthless.
as i said in 1st post - system have no leaks

Quote from: terminator on December 07, 2013, 07:08:36 PM
I saw 22 psi on K03 turbo with standart pipes. Though its not ok for K03, but I mean pipes are not so important.
I installed K04 and made a holl into air filter box (like RS4 box now but without flap  Smiley).

You can check catalyst also (if its still installed) and N75.

But I think the problem with the turbocharger.
no cat
N75 works fine, but i will try friends one thanks
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RS-MAD
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« Reply #16 on: December 08, 2013, 03:54:28 AM »
Quote from: fukenbroken on December 07, 2013, 04:37:28 PM
there is only one restrictive place - turbo inlet. pipe is silicone from frankenturbo with TT maf housing and AEM dryflow filter.
so if typical K03/K04 can rich more, than <i think> mine too

as i can understand file cannot be a problem because WGDC = 95% (max) so WG must be closed
turbo.. maybe. this is hybrid and who knows how it works, but this is not old one.

Your wastegate spring is soft and wastegate opens under backpressure , replace or short the wastegate arm lenght.
You have big compressor side turbo and small K03 exhaust housing , its normal to see high backpressure with this type of turbo.
And Im sure you still use your K03 wastegate actuator.
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fknbrkn
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« Reply #17 on: December 08, 2013, 04:12:28 AM »
im using wastegate actuator coming with this hybrid. btw im trying to compare spring strength by pull actuator arm (by my hand) on friend`s K03 car and it looks ~~ the same. i will try to pull K04 car actuator to make a sense
so if i tighten spring by shorten arm it will give me a good result (without overboost in mid-range RPM where wastegate opens) or better buy K04 actuator?
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terminator
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« Reply #18 on: December 08, 2013, 04:29:49 AM »
Quote from: RS-MAD on December 08, 2013, 03:54:28 AM
Your wastegate spring is soft and wastegate opens under backpressure , replace or short the wastegate arm lenght.
You have big compressor side turbo and small K03 exhaust housing , its normal to see high backpressure with this type of turbo.
And Im sure you still use your K03 wastegate actuator.


I use K03 actuator with K04 turbos and everything is ok - 22 psi when I need it. 
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prj
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« Reply #19 on: December 08, 2013, 09:29:17 AM »
Quote from: fukenbroken on December 08, 2013, 03:28:43 AM
as i said in 1st post - system have no leaks
How did you check for leaks?
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fknbrkn
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« Reply #20 on: December 08, 2013, 12:04:48 PM »
we used empty fuel filter housing installed on a TIP in maf place
and set 1 bar (~15psi) pressure to it then listen to air noise

only one leak from oil level hose. we plug this hole and there is quite and pressure holds

didnt check with bypassed PCV
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ddillenger
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« Reply #21 on: December 08, 2013, 12:20:52 PM »
Quote from: fukenbroken on December 08, 2013, 12:04:48 PM
we used empty fuel filter housing installed on a TIP in maf place
and set 1 bar (~15psi) pressure to it then listen to air noise

only one leak from oil level hose. we plug this hole and there is quite and pressure holds

didnt check with bypassed PCV

Pressure testing only finds leaks PRE throttle body. There are a lot of potential failure points POST throttle body as well.
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fknbrkn
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« Reply #22 on: December 08, 2013, 12:46:09 PM »
i ve replaced ALL PCV with vacuum pump
yesterday we`ve checked vacuum line from N249 to BV (with vagcom output test) and N75 to WG with same pressure test. also we`ve checked brake booster line going from side of manifold. they all ok

we have no time to check PCV vacuum pump line going from downside of mani, so i will try to made it. but as i said - they are all new..
« Last Edit: December 08, 2013, 12:51:15 PM by fukenbroken » Logged
terminator
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« Reply #23 on: December 08, 2013, 12:51:02 PM »
Chinese gybrid? Just interesting. Smiley
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prj
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« Reply #24 on: December 08, 2013, 02:56:05 PM »
Quote from: fukenbroken on December 08, 2013, 12:04:48 PM
we used empty fuel filter housing installed on a TIP in maf place
and set 1 bar (~15psi) pressure to it then listen to air noise

only one leak from oil level hose. we plug this hole and there is quite and pressure holds

didnt check with bypassed PCV

This is not the correct way to test.
The correct way is to use a tire inflator, and add 1 bar of pressure, after that let go, and see how long it takes for the pressure to drop.
It should be more than 1 minute.
If it drops as soon as you let go of the trigger, you have a leak.
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fknbrkn
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« Reply #25 on: December 08, 2013, 02:58:54 PM »
dont know who did it
have a photo



so im shortened actuator arm and car drives more agressive. im slightly lowering LDRXN after 1st post of this topic. so actual pressure now same as specified and its the same that i have previously
but WGDC curve now look right for me and it reach 95% only @5600.
maf are 199 g/s now vs 182.. im very surprized at this value. but dont know how can be different values at the same pressure.. is it possible?

here is comparing picture with 1st post log and im attached new logs



prj, im pushing off the compressor trigger and pressure holds.. unfortunaly we do not waiting for a minute, but ~30 sec it holds
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terminator
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« Reply #26 on: December 09, 2013, 04:53:25 AM »
Looks like chinese crap. Good luck with this turbo  Wink
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