Re: NOS on a 147
The reason you wouldn't activate nitrous at 2500rpm in 5th is this: Nitrous pretty much produces its full torque regardless of rpm. Therefore if you used it at low rpm with high load the huge increase in torque will make cylinder pressures go through the roof - remember you are essentially splitting the power over the revolutions - low revs means higher power delivered by each stroke. This is also nitrous injections biggest plus point. If you are drag racing and have built an engine to specifically withstand this kind of abuse you have an insanely favourable torque curve.
I've been using a Wizards of NOS kit for about a year now (on an off - not much use in the winter - wet roads, ice etc) Lots of fun and unlike a turbo you can flip a switch and have you car back to normal. I'd definately recommend Wizards though - great quality and support from a very friendly team including the MD Trev. Remember this though - the American kits are made down to a price, this means poor quality, generic solenoids. If the fuel solenoid beomes blocked or otherwise fails - you are looking at an almost certain rebuild. Not worth the risk - stick with Wizards stuff - lifetime garuantee with their solenoids.