as posted in tech Q & A

engine wise, make sure that all sensors are working correctly.

give it an oil (i use castrol rs 10 W 60, other recomend others like mobil 1 or solkolene) and filter change.

change the cambelt unless you are absolutely sure that it has been changed recently

maybe change the fuel filter (under the boot floor) - get new copper washers

if it's running ok, and fuelling well over the whole range, then that should be enough for now. you could do things like new lugs, leads, dizzy cap etc, but unless they're giving problems i probably wouldn't bother.

suspension wise you should check the condition of any bushes, and replace if necessary. the rubber will be getting pretty old and soft by now.

i would drain the gearbox oil and refill with new. there is only one filling hole, so to drain you will need to suck it out. same with the diff oil.

check cooling system condition and put new coolant in. the rubber hoses could be on their way out by now, and if it hasn't been well looked after with good anti-freeze, the core plugs could be rotting from the inside out.

i would change the brake fluid. the fluid is one of the weak points on a 2wd cossie. the pads, discs and calipers are good enough for 350 bhp in most situations if the brake fluid is new and good.

you should also check the wiring. they have a habit of melting the fusebox in the circuit for the radiator fans.

i'm sure there's more that other people will recomend, but that's a start for you.

you need a bigger turbo of some sort, (so called t34 or t35 is most common) but many choices these days. you'll need to run more than 1 bar of boost, so you'll need a MAP sensor with a larger range (3 bar sensors that read 2 bar of boost are readily available) and an uprated wastegate actuator. you'll need more fuel than the standard injectors can supply, so you'll need bigger ones (so called greys are the most popular for that level of tune, but there are other options). then you need a map to run of that. if you go the std route, you could get an off the shelf chip to suit your original ecu. but if you use any unusual components, you will need to get it live mapped.

to be honest, that is quite a massive subject just by itself. have a good read around on here, and make use of the search function. i would keep it how it is for a while until you fully understand what you need to do with it and how it all works.

get yourself a copy of the manual that you see cd's of for sale on ebay or elsewhere, as one of the manuals descrbes the engine and management in enough detail for you to really understand things like boost control, engine sensors etc.

hope that helps to kick start you in the right direction, and brings it bttt for some more replies.