Just returned from the smog shop. The operator said he had to abort the test - because the Z had no power - I assume this was under load. Hmmm? - The owner is also a friend of mine. His is a test only shop. To my knowledge he is not a mechanic but just a smog test guy. I say this because he had very little explanation as to what may be my issue. Having just driven about 5 miles to his shop I can attest that the car seems to have plenty of power. The car is an 85T 5 spd GLL. The engine is an 88W Turbo. I installed the engine a number of years ago and due to Z31 gremlins that I seemed to have sorted out is now running pretty well. Apparently not as well as I thought. A few years back I pulled a the driver side head and replaced some lifters so I can say for sure it is a turbo engine having seen the piston tops. My compression is not astounding - 144 - 148. I blow no smoke or water vapor. I have a cm 3" turbo back - which has had very few miles on it. At one point I was blowing a lot of black smoke - It has a Magnaflow Hi Flow Cat - California spec. I just wonder if the cat could have gotten clogged. I can see through the large holes but I know nothing about a plugged cat. I assume a muffler shop would be able to tell. If that is not the issue - Could I have misaligned the timing belt a notch? Would this be enough to cause a lack of power under load. It is timed to 15degrees and it is steady at that mark. I guess I will drive over to the muffler shop. Any suggestions would be appreciated. The engine is stock with the exception of having the turbo remanned to T3/T4 spec. Injectors are top feed original to the car and seem to be working fine and most everything sensors etc. TPS IAA and many other items have been replaced. It also has a manual boost controller which is set to minimum.
Edited by 85zxt, 17 September 2015 - 02:25 PM.