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Mk5 General Area / Re: K04 Conversion - Do you ever regret it? How is it for daily driving?
« Last post by ZoliWorks on Yesterday at 08:40:10 am »When accelerating it would sometimes feel like the power was being held back for a second and then return, hot or cold.
Boost would suddenly drop on my gauge and return, and felt like something stuck and then suddenly opened......hard to describe.
I could not figure it out and had worked my way round the entire engine......decided to try the newer Conti TB and it resolved all the issues. smooth power delivery and the car also felt more responsive.
100K on the VDO TB and it was an early one too.
Actually now that I think about it, this is exactly what my 1.4 TSI is doing. Under load, such as when climbing a hill or just driving spiritedly, the car sometimes just lets out a puff and drops power for a second, as if all cylinders would misfire at the same time. I've also had the car die a few times both right after starting or after coming to a stop. At one point it even gave me a fault code for the TB being faulty but I ignored it because it didn't really show any symptoms then.
In other news, I've looked into my fueling issues. The current rail pressure map is stock so it only requests 120-122 bar most of the time but 4th gear and above it requests 130 bar since it also requests 0.1 bar more boost pressure.
I think my FPRV is failing as it might be leaking fuel out of the rail. After letting the car sit for the night, when I open the door, the electric fuel pump kicks in and there's a noise coming from the engine that sounds like you're pumping water out of a syringe but it's half full of air. It also takes a couple of cranks for the engine to start in this scenario. Even if it starts after 3 cranks, it dies right after and has to crank 2 more times till it fully starts up. Tho no issues if I cycle the pump twice, starts right up 2nd crank.
I'll be replacing my fuel pump internals with the VIS motorsport 165 bar internals and I'll be fitting an Audi RS4 FPRV. I'll be doing the valve first to see if it helps with anything or if there's an actual leak somewhere in the system.
While the car drives strong, I feel like it really doesn't like the current setup with cut-back fuel pressure and stock injectors, like it's constantly yearning for more
