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when i said good tune.... on a stock ecu. Since when i ran nitrous we had no way of doing anything, back then their were no options except to get the ecu flashed with a nitrous map. But that would hurt your non nitrous performance.
So good tune meant, throw the car on a dyno. Run it through and ENTIRE bottle. and keep checking your A/F and swap jets accordingly.
With nitrous i NEVER take someone's word for what jets to use, that is utterly insane/stupid. lol Every car is different; hence, you need to tune the cars accordingly.
-Eric
My car ran very lean with the recommended 75 hp jets from NX . I installed my wideband on my 05 G35 and the A/F ratio went to 14.0 rigth when it came on and stayed at 13.8 all throughout the rpm band. I now have 41N / 32F and the a/f ratio is in the high 11's. Its a bit conservative but I would rather make a little less HP and not run the risk of detonating. I also also have 2 steps colder plugs!!