Hi guys,

I've been trying to get around 1.2 to 1.3 bars of boost request by altering LDRXN. What would be a good smooth transition throughout the graph?

Should I:

-Max request at around 1800 RPM, then very low decrease up to 4500, then taper down quickly to 6500+?


Maybe you guys had better experience with this. I am going to try this on a K03S, and maybe a K04 as well. So suggestions are welcome!

Up top your limitations will likely be injector on k04s.

Yeah I understand the injector limitations fairly well. However, I'm just looking to know where and how my LDRXN load curve should look like.

Like KasperH said, the K03s goes "out of breath" at 4500rpm, which I dont really know what he means by numbers. Does he mean, from 1.3 bar to 0.8 at 4500rpm, or something similar? I'm just trying to apply some suggestions so I can finish my LDRXN curve in a reasonable, understandable graph which tapers down (hence K03/K04)...

Also, at what Boost level should my turbo settle down to from 5-6k+ (so I know where to make my graph linear at a set amount of load). Am I wrong, and there is a different approach to it?

EDIT: My LDRXN Curve, how does it look? For a K03-058 (K03S) .. Hmm how do I add an image to this forum.

Find a compressor map for the turbo, then you can calculate exactly where the limitations of the turbo is.
Surge, choke, overspeed and efficiency.

I have a plotted compressor map from when I had my K03s, I'll upload it later.


1 bar @4500 taper to 0.7 @ 6500.
But the K03s is pretty much useless beyond 6000RPM.