Hi all, I'm usually over in the 8L section but have been looking @ a mates B5 S4 for him today & done a couple of logs with another mate whos a member here (Cheers Ross).
The car is having intermitant overboost problems so me & Ross did a couple of logs today, the car intermitantly overboosts then logs a fault code for it & holds back quite a bit until the fault code is cleared. The car has an unknown remap, uprated recurculating valves & a full de-cat exhaust system. The logs were done in 3rd gear, full throttle straight after clearing the code, after both logs it stored the overboost fault code & held back boost giving a lack of power.
I've a fair bit of Audi know how but I'm quite new to logging, as far as I can make out everything alse in the logs looks ok but I think it looks a bit slow to come on boost & then the actual exceeds the specified a fair bit which is why it logs the fault code.
With the fault being intermitant I'm thinking its either a problem with the N75 being a bit sleepy or mabey the wastgate rod/rods sticking or a faulty wastegate actuator, although mabey not the actuator as a fault in the diaphram mabey more consistant?
Can any of you guys look @ the logs bellow or suggest any further logging/testing we could do or any other possable causes you could think of? Any help would be much appreciated.