[Ayresyy]

Appreciate the replys, The cars already had discs put all round instead of crappy drums and i think the gearbox might hold i'm not doing it so i can rag the car about more of a project and seen as i've never seen one done. I assume taking the same cooling method vauxhall put in there cars should work fine. Was thinking about the compression ratio, maybe i would need to take it to a garage to for an engine rebuild however it's having a top end rebuild soon for peace at mind as i don't know when the head gasket was last done and its getting on in miles. The turbos on the 1.7 don't hold much boost and i strongly doubt it will add too much power (Alot more then the cars got however i don't see there being too much of an increase, it's not like i'm putting a turbo the size of my head on.)

The whole reason for fitting a turbo is not to take round a track at a million miles an hour, the whole reason i'm looking at doing it is for:

Fuel Consumption / Emmissions ( Turbo cars release alot less emmissions and are known to be better on fuel)
A little power ( Just giving it that extra bit of go when it needs it)
Exclusivity ( I've never heard of a astra G 1.6 8 valve running a turbo and i strongly doubt there is many if any)
Experience ( I've never turboed a car before and want to have a go at it)
Insurance ( I can get cheaper modified insurance with a turbo then i can putting a different engine in)

So don't think i'm fitting a turbo so i can turn it into a 5 second quarter mile because car 1) i can't afford it, 2) it would be easier buying a better car as a base and 3) I am not looking for that.

EDIT: All my research says it's very possible so i looking for a reason it's not or if someones done it what did you do and how did it go?

Anything is possible if you have deep enough pockets. You will at minimum need to consider:

Changing fuel pump and pipework system
Swapping map sensor (if a positive pressure rage is even possible with your ECU?)
If not you may well need to factor in the cost of an aftermarket ECU - you should budget for this anyway if you want it to work properly
Even if the gearbox does hold for a while (it was only designed for 170nm of torque) your clutch will not last long (if it holds at all) budget for an uprated clutch
you should also budget for higher flowing fuel injectors
You will at minimum need to add a spacer to the head (which is a really cheap bodge to lower the comp ratio). New lower comp pistons is the correct way to do it
You will need to buy a suitable aftermarket manifold and a turbo suitable for your engine (the diesel items are different in design and size and will not work properly for reasons stated above). Think about the difference in heat you get from a turbo charged petrol engine exhaust and you will see why this can't work. Also consider the rev limit of a diesel - no boost is needed over 4.5k RPM.

There will be other things not listed here that will also require money to get this project to work, just make sure you have this all costed up before you decide this a cheap upgrade.