I did this last week and it only worked that one time... unplugging the ecu now and trying to start it doesnt work either. That time though the car was idling pretty good. As i said in an earlier post, i couldnt drive it around a bit becuase it was behind a double parked car.

It really depends on how your turbo timer was installed, is it one of those cheap no brand timers with 4 buttons (two each side) and red led display?
 
Take off your steering column trim and try to find how they installed the timer, some have a adaptor to plug into the ignition barrel loom and some are just soldered into the existing wiring, if it is the plug type just remove it then try start the car.

its an apexi turbo timer, with the little ball to the right of the display. I am not sure if this helps towards figuring it out, but i got the mechanic to do a steering wheel replacement as well, dont think i mentioned that earlier. The horn doesnt work, but the day i drove the car back home from the workshop it drove and turned pretty good.

I just spoke to the mechanic and he said he started having issues starting the car after the steering wheel change. So that means it must be in within the steering column area, underneath the steering column trim and the wiring with the turbo timer which may have been affected during the wheel change.

Well if defiantly sounds like this could all be related to the wiring in the steering column, maybe some wiring has been damaged? Could also explain your broken horn,
 
It all runs into the same wiring loom as the turbo timer

Well there you go, remove the bottom plastic trim piece under the steering wheel and trace the turbo timer wires. You might find some dodgy wiring near the ignition switch? And as mentioned above, unplug the timer wiring if possible?
You might as well remove it permanently?

Yeah mine was giving me to much trouble so I ditched it permenatly,
 
I just let the car run for a few seconds after I drive it and it's fine, my engine is heavily modified and I have never cooked the oil in the turbo.

Thanks fellaz...hopefully this will solve the issue. Love all you're work. Will report back on here soon after I try and fix this problem. Peace