It isn't a good sign you didn't plan this out or even know what springs you have installed BEFORE doing any tuning

That because that is the normal range and resolution for proper boost control is between 0 and towards 90 % or so, not 0-10% that is just bad. Literally put on a stock ko3 actuator or something and check how it works.

you shouldnt hit peak boost with 10% wgdc or so , that is bad, you gonna have shit driveability and other crap, thats why you have the n75 in the first place.

Hi, just a brief update.  I'm having a great time- inching this map forward.
Since changing the N75, I am finding.. what was essentially fuelling compensation due to the lean running fear, needs to be brought back to the theoretical values, as it smells rich. She's my 0.80 desired is regularly 0.79/0.78.


I know the general consensus is get a lighter spring in the actuator,  I think I could actually remove the actuator from the bracket without removing the turbo. But as it is, it is 1bar spring, 40% wgdc takes it to approx peak 1.5 bar, so apparently 80% takes it to 2 bar. There's a lot more range,  and confidence in controlling this.

I still have the high load, high revs timing rolled back. My aim is to get a safe + smooth WOT run,  then start to add a bit more timing advance back towards stock, with the old N75; as soon as any noticeable power- there's associated knock and afr drifting. I have not had any afr issues since changing N75 (fingers crossed) and although the boost profile is under the map sensor limit.

Once I have something im happy with I'll upload some logs.   Thanks for the help.