Cobus SA

I run a 2006 spec Z - 216 Kw stock - and have fitted a Dastek Unichip, which was installed when the car had done 1500 Km. Now, it has just had it's first service, 15000 Km, and I now always run it on standard (In South Africa 95 Unleaded), with an 10 RON (Claimed ) Octane Booster added.

Octane booster gives more punch, but I alsa have felt a stutter under power, which Nissan says can only be due to the chip. 'Taking the Nissan workshop manager that did the service along to the dynatuner and also installer of the chip tomorrow.

Question - timing settings with the Octane Booster, to advance and by how much?

Also, had the cats taken out altogether, any effect on all issues mentioned here. Incidentally, prior to the octane booster use, they already got 231 Kw as a reading - with the chip and cats done.

Oh, forgot - hardly use it though, roads crappy here and cops everywhere - but I have a 75 shot NX Nitrous kit fitted, not referred to in the test reading given above. Any considerations?

New test/mapping will be done 24hours from now.