Thanks for the comments guys. I have read into this quite a lot and looked at the precedence of what guys in the states have done. I'll be taking it easy compared to what some guys have done. Mt strengthening of the rear end is a start, and I know I need to work my way forward, especially with my previous run of luck concerning transmissions, but I'm not going to go crazy with the gas. There are plenty of guys in the states running 150shot on an otherwise stock car with no problems at all. I'm a little more paranoid than them, which is why I’ve started with spending money elsewhere, and why when I fit the gas I will initially only be running a baby 50 shot just to give me a little poke at the drag strip until I have built up my second engine.
I've also looked heavily into what controllers are available, I don't buy into the driver hitting a button that fires the solenoid and that being it. It's ludicrous to thing you can instantly hit the engine with another 150hp and not expect the shock of that extra power coming in not to stress the engine, trans and rest of the drivetrain. This is why I will be using a progressive controller to feed in the power. However, the controllers that are out there do not fully satisfy my paranoia in terms of what else can go wrong, so I am actually designing my own controller with the aid of another engineer I work with to monitor a whole range engine/trans parameters so that if ANYTHING is not right it will shut down before it becomes a bigger problem and datalog what went wrong. I will also be addressing the common issue of solenoids not firing correctly by monitoring the coil 'ring' profile which allows you to determine if the solenoid has fires correctly. This is effectively the same principle used in engine management systems to determine if an injector is working correctly.
By the way Ray, Any idea why no one has ever made a solinoid that has two valves (one for fuel and one for nitrous) but opperated by the same coil. It seems like a really obvious way of not ending up spraying one but not the other. If it fails, then nothing at all gets sprayed and the engine lives to run another day.
Nitrous can be break cars, but with the correct amount of paranoia mixed in I think i'll be ok....
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