Turbo boost unstable....

[leo]

Hi
I have noticed that my boost isn't so stable as it should be.
It's look like this: sometimes peak boost is 1.4 BAR (as is set - on 4th gear), and sometimes it's reaches only 1.2 BAR. There is no pattern, when that happens, I don't know from what it depends... Engine is running on Shell vpower 99+ so I don't think it's the fuel.
Why ?

ps. maybe AT LAST someone will chip my car properly?!

[robo]

That 99+ is very bad in Poland , well it was for me it blocked my fuel filter within two weeks.By the time the fuel riches the petrol station it will not be more then 90.

[leo]

hmmm well, it's a good point... In that case I'll get some 106 octan fuel, and mix it with vpower. We'll see what's the difference.

Maybe someone has any other ideas?

[Greenm3]

Its alright for every1 on the other side of the channel they get high octane fuel. we get nothing but shell optimax which i think is at best 99. at thats Foo**in expensive.
Fuel in th uk sucks.

[robo]

Well i tell what the best fuel I had come from germany, in poland they add water or other stuff to petrol.

[leo]

You DON'T WANT 2 KNOW what they add in Poland to petrol....
But, we're a little off topic here....

[robo]

You DON'T WANT 2 KNOW what they add in Poland to petrol....
But, we're a little off topic here....

I would check for boos leak, check all hoses.

[leo]

Hi, checked the air leaks, there's nothing found....
I don't know if I'm wrong,but is it possible that the ECU cuts boost to predefined level via WG?

[RIX]

the weather+engine temp will influence the settings,that is why you have more ps when it cold out side ,the air is better it can give maks boost,when the air is too hot it will fell fin but the boost is loover,so you don´t blow your engine.
RIX