Hi mate and welcome to the club, I have a few questions which may help you get the best out of the advice here
Where did you buy the car from and do you have a full spec list, if so can you post it up with a pic of the engine bay
The T88 is a very laggy turbo ( I had one on my R32 GTR) it produces a lot of power but at very high revs, it takes an age to spool, is your engine stock ?
I take it you brought the car with the parts missing or broken already ??, or did this happen while driving
Who is fixing the car now, do they know what they are doing with single Supras