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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old November 26th, 2019, 12:29   #31
Ricsi168
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Ahh i checked the actuator on the old turbo like 200x times stop screw rod lenght.......even with vacuum all time i dont get good spoolup something was wrong with that turbo or maybe its really not choice for this engine!
Absolute the gtc fo daily drive is avery good turbo,okay you not gonna make 400hp drag monster with that turbo but its faster than stock 1749va and doesnt cost too much to put on.
One thing i noticed today when i go 5th or 6th gear with WOT the turbo slightly and slowly over boost i got set 1,7bar boost and its creeeps up.
At the moment i dont have time maybe my n75 is going **** or the other thing i can imagine this turbo is for newer engines and 16V cyl head but with this old technic the turbo actuator cant release the geometry far enough to deal with overboost.
When i got over boost the duty cycle goes 90+% so if the n75 is working as it should all vaccumm goes away from the turbo with 90% duty cycle if im good,so i need to lenghten the actuator a bit.BUT the problem comes here this kind of actuator is fix doesnt have a setting ability....:/ so maybe,maybe i need a custom actuator if im right?
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Old November 26th, 2019, 13:37   #32
Ricsi168
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okay guys maybe i sorted the things out!

as you can see the turbo actuator bracelet screws are marked,and i think the bracelet has a little room to adjust the rod lenght alittle bit!
This actuator is from Darkside, from gtc1449vz i think it has got the adjuster screw may if i cant adjust the whole bracelet i have to get one of those to set with the screw!
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Old November 26th, 2019, 14:50   #33
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How much fuel do you inject and how late? Maybe you are simply overdue long and your EOI is too late. Don't start playing with the actuator from the beginning. During basic settings on turbo, is the actuator opened completely?
Try also to keep it a little more open from the N75 map, if it doesn't keep the boost in lower gears, the PID should correct more or less, but maybe in higher gears it's to late for PID control. I not sure about this, but you can try.
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Old November 26th, 2019, 23:53   #34
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To be honest i was kinda expecting boost creep with such a small turbo ! I wonder what stops you from treading the actuator rod to take a stock gt1749v actuator... its a crude attempt to fix a problem...
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Old November 27th, 2019, 15:12   #35
Ricsi168
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First i have to check the n75 , thanks arazvan for the idea of the program maybe can you me out with that?

Adamss24 what do you mean crude? You mean the holes on the actuator?
Thanks!
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Old November 27th, 2019, 23:49   #36
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Nope, i meant cutting a thread on the actuator rod's end to take a gt style rod end like the one in the picture of darkside actuator... you could make the arm longer/shorter to meet the requested boost altough i would live it stock if i were you and just ask less boost up high just as Razvan mentioned...
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Old November 30th, 2019, 13:27   #37
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I will check the boost levels, and duty cycle i will make logs and will see thanks guys!
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Old December 1st, 2019, 14:34   #38
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Hello guys!!
So today i got a little time i checked the holes on the actuator and it seems it sits the lowest point so i cant make any adjustment on the actuator itself!
After that i unbolted the 3 bolt that holds the actuator in place and i checked if i push down the actuator a little bit if i change the actuator is it possible to set the rod lenght longer but unfortunately it cant go longer because something stops the arm inside the turbo....so i made a log in 3rd gear from ~1800rpm to ~4000rpm to check if i got over boost and check the intake temperatures here is the log!

At the log i took WOT off somwhere in 4100rpm.
What do you guys think about this log?
One thing i noticed the n75 duty cycle doesnt max out when i go with wot..it stays somewhere ~80% as you can see in the logs....
maybe i have to try in 4th gear...
Also downloaded the MAP of the car maybe some1 who knows programming way better than me can help me check the file?
Thanks!!
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Old December 2nd, 2019, 00:52   #39
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You need a 4 Bar map sensor and raising the diagnostic limits a bit so you can see the spikes. It looks like your turbo is overboosting and i dont think the n75 can deal with it as it goes to 94% duty cycle... Maybe dropping the peaks in the boost/fueling maps might be a better idea- turbo is maxed out as you already found out...
Another solution is to get the darkside actuator and make it longer- you will loose some o the low/midrange response but might not solve boost creep- turbine its too small for a free flowing exhaust...
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Old December 2nd, 2019, 02:26   #40
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I think I helped him already (or tried) with the diagnostic limits on ecuconnections.
@Ricsi168 post here your current file or sent it to me to see how it looks like. When you want to see something relevant and running on gears lower than 4, try to log only one channel at a time, like 11, to have a better resolution.
If we look at the n75 at 4000-4400, it's not maximised, it quite ok. You should adjust the request or check the fueling.
In my opinion, when you request over 2600mbar, 4bar sensor is mandatory otherwise you are going blind and sooner or later you will blow the turbo.
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Old December 2nd, 2019, 10:55   #41
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Hello guys!!

Why need 4 bar map sensor i dont understand because i got set 2700mbar and 3 bar sensor reads 2985mbar.
Of course i can get a 4 bar map sensor.
Adamss24: the darkside actuator wont help, yesterday i took off the actuator but the vnt lever wont go any further so the factory actuator if good maybe i have problem either n75 or with the program.when you se 94% i took off my foot from the pedal.
Arazvan: thank you very much for your help, could you please explain why i need 4 bar sensor?
As soon as i can i will send you the file.
And as soon as the weather allow i will do a log in 3rd gear only ch 11 and 4th gear.
Thanks!!
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Old December 3rd, 2019, 07:26   #42
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You need 4bar too see more than 300mbar overboost and be protected by limp mode which now it won't happed, because it's 400mbar over limit, so more than your sensor can read. Linearisarion for the 4bar it's 102 921 500 4000.
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Old December 3rd, 2019, 14:00   #43
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Thanks!
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