All Things Mk5 > Mk5 General Area
K04 Conversion - Looking for opinions & posting my progress/info about the swap
ZoliWorks:
Found 2 graphs on the same dyno, re-drew them as a comparison. Now I see what people meant by K03 being able to harm the engine more. I'd assume the K04 would surge just as much, if not more, if it wasn't controlled properly. Curious to see if the K04, running the same average curve as the below map, would be able to spin wheels as much as a K03 does. The graph does overall look more linear tho and the mid to top end is vastly superior.
The only area where I think the 04 might fall short is if I want to drive it with the same style as I drive the K03 in cities: Flooring it at 2k till 4k to take gaps or merge off-ramps without making people behind me have to slow down.. Or me having to slow down/stop because my car cant put down enough power to jump into a gap. I'll see how the swap goes but I doubt I'd switch back to the K03 just for the low-down power difference.
FatWelshBoy:
Anti-surge cores are all the rage for K04 turbos at the moment, peak torque is achieved around 500 rpm lower than the stock core as the tuner can bring the boost in harder and sooner. I think a little over 300 bhp is the sweet spot for these cars, I've probably gone too far with my car if I'm totally honest. My advice would be to go for a K04 conversion with an anti-surge core and new actuator then remap it aiming for ~300 bhp. You can go for an exhaust, intercooler, intake etc but the stock items are perfectly adequate, I'd spend the money on brakes and handling.
OllieVRS:
--- Quote from: FatWelshBoy on April 01, 2024, 01:06:04 pm ---Anti-surge cores are all the rage for K04 turbos at the moment, peak torque is achieved around 500 rpm lower than the stock core as the tuner can bring the boost in harder and sooner. I think a little over 300 bhp is the sweet spot for these cars, I've probably gone too far with my car if I'm totally honest. My advice would be to go for a K04 conversion with an anti-surge core and new actuator then remap it aiming for ~300 bhp. You can go for an exhaust, intercooler, intake etc but the stock items are perfectly adequate, I'd spend the money on brakes and handling.
--- End quote ---
Anti-surge cores? Haven't heard of them before, probably because I'm not so knowledgeable about turbos. Does that mean for those who get the occasional turbo flutter (either because of a laggy DV or custom DV setting, I have the former) won't have as loud of a flutter as with a standard mapped K03?
I know surge is not great for performance/longevity and embarrassing to some but I'm one of the less mature people who absolutely loves to hear it.
--- Quote from: ZoliWorks on March 31, 2024, 11:08:17 am ---
--- End quote ---
This graph actually shows quite well why the K03 makes the engine feel like it's out of steam at high speeds & high RPMs, as peak power has been passed after ~5800RPM.
FatWelshBoy:
--- Quote from: OllieVRS on April 01, 2024, 02:35:25 pm ---
--- Quote from: FatWelshBoy on April 01, 2024, 01:06:04 pm ---Anti-surge cores are all the rage for K04 turbos at the moment, peak torque is achieved around 500 rpm lower than the stock core as the tuner can bring the boost in harder and sooner. I think a little over 300 bhp is the sweet spot for these cars, I've probably gone too far with my car if I'm totally honest. My advice would be to go for a K04 conversion with an anti-surge core and new actuator then remap it aiming for ~300 bhp. You can go for an exhaust, intercooler, intake etc but the stock items are perfectly adequate, I'd spend the money on brakes and handling.
--- End quote ---
Anti-surge cores? Haven't heard of them before, probably because I'm not so knowledgeable about turbos. Does that mean for those who get the occasional turbo flutter (either because of a laggy DV or custom DV setting, I have the former) won't have as loud of a flutter as with a standard mapped K03?
I know surge is not great for performance/longevity and embarrassing to some but I'm one of the less mature people who absolutely loves to hear it.
--- Quote from: ZoliWorks on March 31, 2024, 11:08:17 am ---
--- End quote ---
This graph actually shows quite well why the K03 makes the engine feel like it's out of steam at high speeds & high RPMs, as peak power has been passed after ~5800RPM.
--- End quote ---
My car is K04 and has an anti-surge core and there's zero fluttering noises. I'm not sure if there's K03 anti-surge cores available?
ZoliWorks:
--- Quote from: FatWelshBoy on April 01, 2024, 01:06:04 pm ---Anti-surge cores are all the rage for K04 turbos at the moment, peak torque is achieved around 500 rpm lower than the stock core as the tuner can bring the boost in harder and sooner. I think a little over 300 bhp is the sweet spot for these cars, I've probably gone too far with my car if I'm totally honest. My advice would be to go for a K04 conversion with an anti-surge core and new actuator then remap it aiming for ~300 bhp. You can go for an exhaust, intercooler, intake etc but the stock items are perfectly adequate, I'd spend the money on brakes and handling.
--- End quote ---
This is probably what I'll do. Intake for the funny noises, downpipe for lower backpressure, better spool and lower EGT's, intercooler piping to fix any possible leaks and an intercooler for hot summers and consecutive pulls.
For brakes, for starters I'm just getting performance pads and disks. for suspension, I quite like the stock springs but I'm getting new shocks and probably H&R front and back stiffer sway bars.
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