1.9 PD150 ARL with GTB2260VKLR turbo adjustment

poxxxy

Active member
Joined
Aug 3, 2011
Location
Staffordshire, England
TDI
2002 MK IV GT TDI PD 150
Hi guys,

I have just this week fitted a gtb2260vklr and firad 80%+ injectors to my car... the car wasn't making requested boost (underboosting) up until 3500 rpm and made 327hp/377lbft but only over 1000rpm rev range till the limiter. I tried playing with N75 map but trying to close vanes earlier didn't seem to really help.

Today we played with the actuator arm slightly and shortened the VNT and boost is now kicking in at about 3000rpm and it pulls nice till the limiter but still very laggy considering it should be able to make 1.4 bar at 2400rpm and after the adjustment actuator is now hitting the stop screw at around 15" on the mercury gauge.

Just wondering what anyone with some more experience would recommend?

Vacuum and actuator hold pressure so there is no problem there... thinking to run basic settings in measuring block 11 tomorrow to cycle the n75 valve and see what the solenoid is pulling on the gauge to check that is healthy.

I will try and get an EMP gauge to hook up to the EGR blank and then maybe some stop screw adjustment may be required too...
 

poxxxy

Active member
Joined
Aug 3, 2011
Location
Staffordshire, England
TDI
2002 MK IV GT TDI PD 150
It seems to hold at requested boost (2.2 bar) when it reaches it... dyno runs were over pretty quick so didn't get chance to take a log there but will try and get a log of block 11 tomorrow and see what's happening there.
 
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Nevada_TDI

Top Post Dawg
Joined
Aug 17, 2008
Location
Reno, sort of...
TDI
2001 Jetta TDI
Even though you are setting the vacuum "start-stop" using the factory settings, they are not optimum for your non-factory application of your turbo. If it were me, I would set the actuator arm to where the N75% is in the mid-60's @WOT in the middle of third gear.
I would not mess with the stop screw until you have run out of all possible options; you could cause an uncontrollable overboost grenade situation with your new turbo.
 

devonutopia

Top Post Dawg
Joined
Dec 1, 2003
Location
Devon, U.K
TDI
PD300 Skoda Fabia
Have you run group 011 logs with VCDS? Duty cycle numbers are often key to knowing what could be wrong
 

martin33100

Veteran Member
Joined
Oct 13, 2015
Location
UK
TDI
VW T5 2.5
Join Date: Oct 2015
Location: UK
TDI(s): VW T5 2.5
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You may have to close up the vanes slightly on the stop screw, these 2260's were used mainly on 3.0 diesels originally so the VNT flow set when closed would usually be much higher.
There is a N75 test you can do on VCDS where it holds the revs up and cycles the N75 fully open and then to fully closed so you can see the differential pressure between the two, around 150mbar is good.
 

poxxxy

Active member
Joined
Aug 3, 2011
Location
Staffordshire, England
TDI
2002 MK IV GT TDI PD 150
Decided to hook up Mercury gauge and N75 was only pulling 12"... Swapped it out for a friend's and his was pulling 25" and now boosting much earlier... Duty cycle around 75% at 4000rpm... Split an oil cooler hose on the last Dyno run so didn't get to play any further... 300hp and 388lb/ft this time around. Best I had with the lazy n75 valve was 327, then 312 now 300... lol. Have another file I wrote with a different N75 map to try and can maybe go another half turn shortening the vnt rod

Just wondering if I need a new oil cooler now or if the hose was tired anyway!
 
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