I should really start a build thread for my S14, the following is for the S14 not the cefiro but I will be doing basically the exact same thing for the cefiro when i turbo it.
for some reason i have this theory that having the wastegate in the rear housing of the turbo is an excellent place for it. So it can be exhausted at the very last place it can before the turbo rather than somewhere random in the manifold.
So... I took the rear housing off the turbo, and drilled a 38mm hole (ended up being slightly over 38mm)
I then cut a small section of 38mm tube i had to place in the hole, creating a neck
Welded it on
Welded up the internal gate hole and ground it flush
I have not yet welded the flange on to the neck because i want to sit it all in the car first and then decide what angle i want to put the gate on etc before i weld it in place. but you can see roughly what it will be like
I also had to cut one of the heat sheild bolt holes off the exhaust manifold for the turbo compressor housing to clear the manifold
thats what i did today
I'll do the same thing but on a standard RB20DET turbo for the SR20 in the cefiro. I will also have to cut off the t2 and weld on the t3 flange to run RB turbo on SR