1.9 TDI turbo pressure?

yabay

Active member
Joined
Dec 4, 2016
Location
Turkey
TDI
Caddy MK3 1.9 TDI PD105
Guys yesterday while i'm checking some measurments, i've found my turbo seems pressuring a bit much... Do anyone knows what mbar psi or bar our turbo pressure setting?
Below the pics are recorded while car runs 100km+ on the highway so the engine is stable hot and lubricated.
the pressure with no actuator adjustment.
2550mbar = 36 psi = 2.48 bar

I pulled over and released the actuator 4-5 times then;
2550mbar = 36 psi = 2.48 bar nothing decreased about the pressure

Pulled over again and tightened the actuator 10 turn to increase pressure
2580,6mbar = 37.4psi = 2.57bar

There is no change in the pressure. Can any one explain me to how the car accepts turbo pressure adjustment?
-My vacuum line are not leaking
-Actuator is working
-vanes moves freely
-acuator arm moves freely
-no carbon deposits
-no limp mode in these adjustmens
 

turbobrick240

Top Post Dawg
Joined
Nov 18, 2014
Location
maine
TDI
2011 vw golf tdi(gone to greener pastures), 2001 ford f250 powerstroke
2550 mbar= 2.55 bar :). That's absolute pressure which includes the 1 bar of atmospheric pressure. So you are really making 1.55 bar or 22.5 psi of boost.
 

k_pt

Veteran Member
Joined
Oct 13, 2017
Location
pt
TDI
VW MKIV TDI
Guys yesterday while i'm checking some measurments, i've found my turbo seems pressuring a bit much... Do anyone knows what mbar psi or bar our turbo pressure setting?
Below the pics are recorded while car runs 100km+ on the highway so the engine is stable hot and lubricated.
the pressure with no actuator adjustment.
2550mbar = 36 psi = 2.48 bar

I pulled over and released the actuator 4-5 times then;
2550mbar = 36 psi = 2.48 bar nothing decreased about the pressure

Pulled over again and tightened the actuator 10 turn to increase pressure
2580,6mbar = 37.4psi = 2.57bar

There is no change in the pressure. Can any one explain me to how the car accepts turbo pressure adjustment?
-My vacuum line are not leaking
-Actuator is working
-vanes moves freely
-acuator arm moves freely
-no carbon deposits
-no limp mode in these adjustmens
Because the ECU tries to adjust, you should be looking at spec pressure, what the ECU is asking.

Is your car remapped?

1.55b is the pressure an ARL does (150hp)
 

yabay

Active member
Joined
Dec 4, 2016
Location
Turkey
TDI
Caddy MK3 1.9 TDI PD105
I'll post the request pressure, yes she is re-mapped with a soft map. Then 1.4-1.5 Bar is not much, is it correct?
 

eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
You should be adjusted to about 3lbs over requested at peak. I shoot for 138 - 207 mBar over.
1lb = 69 mBar
2x69=138 and 3x69=207
 
Last edited:

k_pt

Veteran Member
Joined
Oct 13, 2017
Location
pt
TDI
VW MKIV TDI
I had my ASZ (1.35b) doing peaks of 1.7b. Never broke. And it was a KKK, not a Garrett.

It's also important to keep the EGTs low. Don't push too much pressure when you are in "coal runner mode".

300mbar over is not that much in my opinion.
 

Zak3

Veteran Member
Joined
Mar 19, 2009
Location
Morocco
TDI
98' Audi A3 8L (from AGR to ARL)
The pressure is regulated by N75 which is controlled by ECU. So even if you adjust the actuator the ECU will do its best to get the specified pressure.

For info 2.55 bar is a very high value for a VNT15, it'll be ok if you use a VNT17.

If you use vcds you can see what is the specified pressure requested by ECU.
 

eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
Try Malone's website, just drop the file in the browser and copy the address them post it here. I can't view the file.

Sent from my Armor_2 using Tapatalk
 

yabay

Active member
Joined
Dec 4, 2016
Location
Turkey
TDI
Caddy MK3 1.9 TDI PD105
Thank you guys for your replys...@eddieleephd can you give an adress to Malone's site?
 

eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
Yeah, it's overboosting a bit more than desired.
From the top you want to unscrew to loosen the actuator and lengthen it to get it down between 200-300 over. Looks good otherwise.
 
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