if its the one at the front of the car, its not an ac fan but a overtemp fan.. only comes on over approx 100deg they can be wired up to come with ac and thats a good idea in Queensland! The gtst fan is physically smaller in the motor assembly and i assume flows less.
Myself being a GT-R owner and auto electrician, Rogers quote is about right. Gtst and gtr compressors are almost the same, you need to drill and tap in 2 threads onto the top of the compressor (the lugs are cast but not finished) as the suction pipe is different and further forward to clear the front turbo. And early and late models are slightly different as well. There is a bit of time in flushing out the system also, when the compressor fails it can put metal particles throughout the system.
clean the battery terminals... check the voltage after the terminals while cranking ill bet you find a massive drop. if it was the alternator, the car would have cut out before you got home, and not continue running after you jump start it, and battery wouldnt show 12.7v either.
by the sounds of it the fan clutch might be siezed and thats why its noisey. this will also cause the fan to crack due to overspeeding it, make sure you change it soon, or else it will become a bonnet emblem!!
I have the loom, fuel rail and exhaust manifold (RB20det), and the coil and cam covers (also rb20det), no ecu and only a standard rb20det turbo. if your interested pm me. BTW im in Brisbane.
The electric fan is only there for an over temp situation (look for the sensor on the radiator with the green plug on the rhs of the radiator shroud). That is switched by ground from the ecu to the switch and then the switch turns on the fan relay, can only check while its running,just bridge out the switch. It is possible to connect the fan relay either by another relay or diode to the ac relay.
yep ill take one!! sign me up, i think its a hot thing, just hope its got some good technology under the skin. hopefully the french people will still let the japanese people to build the ultimate supercar.
i have had this problem too, ive located it to a faulty tps switch, it drops out and gives flat spots just on low throttle. very very intermittent.
btw 60 knock is regared as an "event" 20-40 is acceptable i believe. ive never seen more than 40 and only on decel, never on acceleration.
maybe the cam was bolted down with no reference to tdc at all, and some of the valves opened and had piston contact which would be enough to bend/ crack a valve.. either way its not going to be nice, not exactly a common engine at the best of times.