Need to block off the vacuum solenoid, block egr. Thats all I've done plus fit Dawes and needle valve under bonnet,
You need to read Chaz Yellowfoot {guru} on Z30 via search engine. don't think 18 is better 15, doen't work like that.
By doing all these things you take the thinking away from computer and controll it yourself, When you do adjustments disconnect battery for 1 hr or so
as well, Whats Dyno fitted??? Just doesn't sound right, or I'm missing something