Hello, this is what the graph for my boost looks like under normal conditions (1-2 people no luggage).

 

 

However, when I load the car up with 5 people and luggage OR, if I carry a big boxy trailer, I would get into limp mode if I accelerate harder or overtake. I don't mind it that much as I can just restart the car and it comes back to life but I fear one day it will do this under normal circumstances too...

 

This summer I even tried maxing out the speed on the german motorways and it only lasted about 5 minutes at 200/210 km/h. Then overboost threw it into limp mode (The car had no passengers and not a lot of luggage either)

 

Is anyone able to interpret this graph in any way? (throttle at 100% and started accelerating from around 1500 RPM)

 

To my untrained eye, the first part up to 2100 RPM looks like a prolonged turbo lag and then the rest is an overboost waiting to happen (should the car be fully loaded)

How do you get the graph. is it from VCDS? I am expecting overboost problems from sticking vanes as I had on my MK1 and  have noticed a difference in the measuring blocks between specified and actual boost but a graph would be much more telling.

 

Graphs and VCDS aside going back to when my diagnosis were from gut feeling and experience you have exactly the problem I had on a 1.9 tdi 90 hp Alhambra, it was the vacuum pipes collapsing under the heat from the turbo, the more the car was loaded or driven hard up a steep hill the quicker it would happen and go into limp mode,  ignition on/off would always reset it but when towing a race car and trailer up a hill it would happen several times each time more rapid than the last.

 

That is what I would check, my pipes were intact but degraded and could collapse under heat and vacuum.

 

Editted, my MK1 Octavia would also overboost in similar situations through sticking vanes but only during the warm up period in winter, I just got used to driving gently till everything was warmed up, after that no problem so the pipes were not the culprit.

Edited 7 November, 20187 yr by J.R.

VCDS will get you a .csv file with the data. It's up to whatever you use to read that file to create the graph for you. 

 

I used Excel:

- select the two columns (spec. and actual)

- Insert a graph of your liking

Beyond my skillset

Pm me. I will give you my email and you can send it to me - I'll do it for you 

Or even just attach it to a post

 

Sticky turbo or a small boost leak.

Thats very kind of you both but I will also have to cross the hurdle of using VCDS as datalogging, its one step at a time for me and also when the weather and the flux of clients permit but I realise that its essential learning and a tool that I need to master if I am to continue working on my own vehicle.

 

I will take you up on your kind offers one day and in doing so hopefully learn a bit about using Excel or whatever.

 

Use it or lose it!!

Sticky vanes, I gave mine the Mr Muscle treatment in the spring when I'd been having overboost. It's been good since, although i expect it will need more as time goes by.

To see VCDS log data in chart try this handy app, old one for old style logs, new one even for modern style UDS Free for private use, in English too.

 

Old Logview V0.1.6

New Logview V1.6.1.1

 

https://www.logview.net/download-logview/

https://translate.google.cz/translate?hl=cs&sl=cs&tl=en&u=https%3A%2F%2Fdieselpower.cz%2Fforum%2Fviewtopic.php%3Ft%3D1053

I'm sorry but my mother warned me about people wanting me to click links to download things!!!

I guess then you do not own any driving licence because of your age You can read the sites before you download any software, old version does not need even any installation. Watch out