Both Water/Meth and Nitrous Oxide are sprayed into the airflow just before the intake.
Water/Meth benefits are added charge cooling and detonation suppression. That way you can add more boost and timing advance safely and thus increase power.
Nitrous Oxide benefits are added oxygen that means you can add fuel to increase power. Secondary benefit is it goes from liquid to gaseous state as it sprays and cools down the intake temp dramatically - perfect to combine with turbo for huge
In essence Water/Meth adds safety margin - so that you can add power , Nitrous Oxide adds power, but takes away safety margin.
You've already bought the NoS kit, so now the question how to best use it in a turbo environment - I'd say your biggest bang / buck / safety balance would be a very small shot that the biggest advantage is the air cooling effect of the high pressure spray.
Your ECU must then be setup to make use of a wideband lambda preferably as the nitrous shot alters AFR quickly and dramatically and the ECU must react quickly and dramatically to fuel accordingly
Thx for reply Gertie good advice as normal.
There is lots to think about while adding all these mods(although the Nos is only a once in a while use item for straight line runs a few times a year ). this is why i was asking about a after market ecu , As i have friends in the drag and race scene who can dyno remap but cant remap an alfa ecu.
if i save and get one of the guys to remap my stock ecu the week after i could need it done again due to changes that may happen. and if i have a aftermarket ecu i can get it done when ever i need.
Im guessing the cost of a new ecu wont be to far off a good stock ecu remap.
So im thinking i might aswell start all over again , pull the engine strip it and rebuild it using the 2.5 crank
Its cold outside im in no rush so i can think about every step and share with you guys and get some advice as i go.
i'll post a piccy of all my goodies ive ordered on monday when the final part arrives . ( btw the nos kit is a wet system with its own ecu which is all i know untill it arrives as the description wasn't very detailed
one good thing is damn im having a good time doing all this