Good morning and hello! 

 

My first post on here so hopefully its in the right place! 

 

Just looking a bit of help/advice on a boost issue I'm having, car is a 2007 2.0 tfsi with a bluefin map, all standard otherwise and has been flawless for the year I've had it until now but I'm having an issue now with the boost not coming back after a quick gear shift.

 

e.g - If im in 3rd, apply a generous amount of throttle up to about 3500-4000rpm then quickly shift into 4th and reapply, there will be next to no boost until I throttle off and slowly press again. Sometimes it will feel dead for a second or 2 then the boost will snap back into life and full power. If driving in a more relaxed fashion just pressing through the gears it seems fine. 

 

I've had it logged while driving, fuel pressure seems spot on throughout, but the requested boost doesnt match actual. (Think it was about 10-12psi lower than requested when its playing up)

 

DV has now been changed, with no difference, just finding it hard with finding anyone else with my specific issue, most are either permanent boost drop (like torn DV etc) or drops due to fuel pressure. 

 

Next up going to check MAF, PCV and N75 will be replaced. Have also read that sticky/torn turbo actuators can play a part here. It does feel like it is some sort of valve that isnt closing when its supposed to under demanding circumstances. 

 

Any help/tips/pointers would be greatly appreacated. 

 

Thanks! 

 

Warren.

Can you move the vnt mechanism? Could be seized up.

7 minutes ago, chrisund123 said:

Can you move the vnt mechanism? Could be seized up.

 

TFSI doesn’t have a variable vane turbo. 

Rules that out then 🤣

 

Back in my non vnt days I once had the wastegate actuator linkage separate so the wastegate was permanently leaking boost, worth checking to see if something similar is up? Can the actuator be moved manually?

Had another look at this last night, I've literally no idea how anyone is supposed to work on the N75 on this engine, its about as buried as it could be, the clips that hold all the hoses on seem to be 1 use jobs too. Does anyone know of a how to guide for getting one of these out? Seems to be very little solid info online about it. 

 

Same with checking the actuator..... I cant even see it nevermind work on it lol

19 minutes ago, wr6warren said:

Had another look at this last night, I've literally no idea how anyone is supposed to work on the N75 on this engine, its about as buried as it could be, the clips that hold all the hoses on seem to be 1 use jobs too. Does anyone know of a how to guide for getting one of these out? Seems to be very little solid info online about it. 

 

Same with checking the actuator..... I cant even see it nevermind work on it lol

 

Usually from underneath?

Morning, 

 

Sadly my issue still remains, I had the map taken off the car and its largely been fine up until recently but the issue is starting to creep back in. 

 

Just got a snippet of the log file from before incase this helps spark any ideas. 

 

Blue is a normal pull, green is where I shift then yellow is where the issue lies, I did not remove my foot from the throttle. 

 

Any sort of ideas are greatly appreciated. 

 

Thanks.