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Author Topic: 1.8T Overboosting or other issues?  (Read 22673 times)
prj
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« Reply #60 on: January 12, 2023, 03:40:45 AM »

There is nothing to "re-do". Whoever made this file has no clue what they are doing.
Not possible to get your money back? Put it in writing (asking money back) then take them to small claims.
Or suck it up as a learning experience.

Certainly don't go that place ever again, because they have no idea what they are doing.
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LynixGO
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« Reply #61 on: January 25, 2023, 03:02:15 AM »

Hello guys.

Im back at it again.

i changed KFLDIMX to 65,75 which fixed the overboost issue (Tight wastegate)
now stable at 1.5 bar

i put the N249 back in after Nyet told me to.
now i have the following issue that really irritates me.
when partial throttle the car sometimes overboosts to 1.3 bar and then jumps back to 0.5 bar
then i hear the the turbo fluttering while on partial throttle
this activates limp mode


what maps do i need to look at to fix this partial throttle boosting issue
any advice / help is appreciated

thanks.
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fknbrkn
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mk4 1.8T AUM


« Reply #62 on: January 25, 2023, 05:41:31 AM »

Axis of kfvpdkse
Take a look at the wiki 'tighter wastegate'
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nyet
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« Reply #63 on: January 25, 2023, 12:57:29 PM »

did you read any of this yet?
https://s4wiki.com/wiki/Tuning#Base_boost_and_wastegate_spring_pressure
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LynixGO
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« Reply #64 on: January 25, 2023, 01:25:12 PM »

Hello Nyet,

I tried to understand it but cant seem to.
i must be really stupid but i trying this now i dont know if i did it right.
i have the 0.6 bar to 1.0 bar spring now

this is original value:



this is the new value:



did i do it right i dont quite understand the information on the wiki (Possibly because its in english. its very poorly translated to my language)
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LynixGO
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« Reply #65 on: January 25, 2023, 01:28:52 PM »

Didnt take the pics

see attached


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fknbrkn
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« Reply #66 on: January 25, 2023, 02:47:03 PM »

So youve got this 1 bar spring on a tiny turbo and now youre fighting with it ) why? tighter-better?

Always aim to 80-90% wgdc at full required boost. 0.6 would be enough
Now you have to fill dimx mostly zeroes, raise kfvpdks* axis even more and hope that it could be driveable somehow (and also pray for n75 and vac lines due to any ldr fault would be catastrophic for that setup)
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nyet
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« Reply #67 on: January 25, 2023, 03:13:53 PM »

So youve got this 1 bar spring on a tiny turbo and now youre fighting with it ) why? tighter-better?

Always aim to 80-90% wgdc at full required boost.

100% agree with the above. There is no good reason for ppl running crazy low wgdcs.
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Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
terminator
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« Reply #68 on: January 25, 2023, 04:28:34 PM »

Axis of kfvpdkse
Take a look at the wiki 'tighter wastegate'

Avoid WOT because the turbocharger doesn't work properly? I would agree if he had GTX2860.
Like I wrote before, the problem is not with the file but with the turbocharger or the actuator.
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Blazius
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« Reply #69 on: January 25, 2023, 06:35:15 PM »

Avoid WOT because the turbocharger doesn't work properly? I would agree if he had GTX2860.
Like I wrote before, the problem is not with the file but with the turbocharger or the actuator.


A k04 is plenty to bend rods on a stock engine, specially a hybrid one with unchecked wgdc/boost profile.
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LynixGO
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« Reply #70 on: January 25, 2023, 07:27:15 PM »

So youve got this 1 bar spring on a tiny turbo and now youre fighting with it ) why? tighter-better?

Always aim to 80-90% wgdc at full required boost. 0.6 would be enough
Now you have to fill dimx mostly zeroes, raise kfvpdks* axis even more and hope that it could be driveable somehow (and also pray for n75 and vac lines due to any ldr fault would be catastrophic for that setup)

Ok thank you i will replace the actuator spring with 0.4bar to 1bar. Rated one
Im running this actuator because the actuator that came with it was leaking
Also i changed kfvpdks axis using 1.8/1.49=1.20 so i understand this is bar? Should i even raise it more because im running 65% wastegate with 1.3 bar boost the mechanical boost gauge also seems broken as i see in log, in log it states 1.2 to 1.3 bar with 65.75% WGDC while on the gauge it tells me 1.5 bar…..

So kfvpdks is used like this?

1.8 bar new turbo pressure divided by 1.49 old turbo pressure =1.20 and multiply the whole axis with 1.20 like i did above?

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LynixGO
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« Reply #71 on: January 26, 2023, 01:39:55 AM »

Also which spring should be the best,
im getting the idea the yellow one is still too much for this small turbo?
should i leave the yellow in or replace it with the green one.

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fknbrkn
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« Reply #72 on: January 26, 2023, 02:21:51 AM »

Get a pull with wgdc 0% and see actual boost
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LynixGO
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« Reply #73 on: January 26, 2023, 02:36:41 AM »

fknbrkn,

Max pressure with 0% WGDC is 1340Mbar
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terminator
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« Reply #74 on: January 30, 2023, 08:31:04 AM »

fknbrkn,
Max pressure with 0% WGDC is 1340Mbar

It doesn't mean anything, as it has plenty of time to reduce the pressure during the slow increase in rpm. After closing the throttle and opening the wastegate, the pressure should drop down in 0.2-0.3 sec. instead of 1.5-2sec in your case.
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