All Things Mk5 > Mk5 General Area
K04 Conversion - Looking for opinions & posting my progress/info about the swap
ZoliWorks:
Aight time for an update!
I've taken off the old K03 turbo and I'm getting ready to mount the K04. Here's a video of the play in both turbines. The K03 has a lot of play in every direction, the 04 only has some sideways play. The 2 mechanics I spoke to said this is normal for it's mileage and as long as there's no back and forth play or damage on the walls/blades, it's good. Worst case scenario I'll just take it off again and get it repaired.
OllieVRS:
--- Quote from: ZoliWorks on May 03, 2024, 11:19:45 am ---Aight time for an update!
I've taken off the old K03 turbo and I'm getting ready to mount the K04. Here's a video of the play in both turbines. The K03 has a lot of play in every direction, the 04 only has some sideways play. The 2 mechanics I spoke to said this is normal for it's mileage and as long as there's no back and forth play or damage on the walls/blades, it's good. Worst case scenario I'll just take it off again and get it repaired.
--- End quote ---
Good update, this is also a useful post for anyone who's doubting the health of their own turbos so they can compare to yours.
pudding:
--- Quote from: OllieVRS on April 22, 2024, 04:50:49 pm ---All looks good - but you will have to be careful, from what I read online upgrading turbo without injectors can lead to running too lean which is dangerous for the engine. Make sure the tuner is aware you are on stock injectors and you are limited. Perhaps 300hp is too optimistic without the fuel related mods?
Also the video you posted is private so I can't check it out.
--- End quote ---
It's all good in the hood. Just pull the N75 plug and you'll be restricted to 8 psi of boost and then fit the K04 injectors at the mapping place before the remap. Probably makes more sense to fit the K04 injectors at home though and save on labour costs, but either way, it's drivable on K03 or K04 squirters before the mapping.
The main issue is whether or not the mapper can work around the rail pressure sensor. Some insist on using the K04 sensor, and some can rescale the K03 sensor.
ZoliWorks:
--- Quote from: pudding on May 03, 2024, 10:12:44 pm ---It's all good in the hood. Just pull the N75 plug and you'll be restricted to 8 psi of boost and then fit the K04 injectors at the mapping place before the remap. Probably makes more sense to fit the K04 injectors at home though and save on labour costs, but either way, it's drivable on K03 or K04 squirters before the mapping.
The main issue is whether or not the mapper can work around the rail pressure sensor. Some insist on using the K04 sensor, and some can rescale the K03 sensor.
--- End quote ---
No plans on fitting the upgraded injectors, valves or fuel pump just yet. This time around I'm simply adjusting the map to accommodate for the K04. In the coming months I'll be fitting all necessary fueling parts to push the car up to above 300hp with my target being 340hp, keeping torque under control cause of BWA rods.
ZoliWorks:
Alright, everything is put together the car starts and runs fine. I'm taking it to my buddy to get it mapped tomorrow. I drove it a bit but didn't floor it. Safe to say it works, no codes, no nothing, not even a lambda sensor code. I'll be back with an update after the map and after I iron out a few more things the V-band which links the 2 parts of the downpipe together didn't clamp on as it should and I feel like there's an exhaust leak there.
When I started the car, after a minute or so it started smoking quite heavily from the turbo area. Turns out, it was just the oil and brake cleaner residue that was burning off due to the heat.
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