Mr_Wid

I've recently bought a my99 uk turbo, and i'm having a slight problem with the boost. Occassionaly on the motorway, i stick my foot down and the turbo pressure surges. It goes upto around 1 bar, then goes down to 0.5 bar, does this a few times and then settles in and sticks to just under 1 bar.

Its normally fine around town, but i noticed tonight that it occasionaly wont go above 0.5 bar

Anyone got any ideas on what might be causing this and how to hopefully fix it?

Turbo2000-Lee

I'm new to this subrau lark myself but i had the same problem you are describing. I was going on a long motorway journey so i topped the oil up and must have overfilled it. What i found the problem to be was a small brass restrictor in one of the rubber pipes coming off the turbo had become clogged with oil, i think this stopped the wastegate from detecting the correct boost level so it didn't open and let the turbo create loads of boost until the fuel cut kicked in. I pulled the pipe off with restrictor in, cleaned it out and it cured the problem.

Mr_Wid

I'll be checking the oil level before i go out in it next then!

Cheers for the info, i'll give it a try and hopefully be sorted