hmm i use ngk vpower sparkplugs (bkr5e11) gapped at .8mm, but as long as the ones you are running are for a 300zx tt then you should be fine ( some others might work but i know for sure that 300zx tt ones work )
as for timing and setting the idle, with a rb25 you d/c the throttle sensor ( its not the plug on the TPS its the plug thats on the like 5" peice of wire that connects to a plug below the TB). Then you adjust the rpms to 650 using the screw on the IAC valve, after you do that you plug back up the throttle sensor. The timing should be set to 15 degrees and when looking from the front of the car the timing marks go 0, 5, 10, 15, 20, 25, 30. You and advance and retard the timing by using the CAS, turning the CAS counter-clockwise will advance the timing and clockwise will retard the timing.
with the fuel deal you need to make sure your base fuel pressure is around 45 pounds without vacuum.
Also you might check into replacing the coolant senor because i know if the coolant sensor with 2 wires is bad then the motor will run like crap. I believe thats because the 2 wire coolant sensor, atleast on the rb20, is the one that goes to the ECU and if it doesnt know the temperature it will use a constant value and fatten the fuel curve. I think thats how it works but i'm not positive
Also since you are blowthru what is your BOV setup.
This is really all i can help you with as of now because you need to make sure that you have the base stuff set before you can further troubleshoot the problem. hope this helps
as for timing and setting the idle, with a rb25 you d/c the throttle sensor ( its not the plug on the TPS its the plug thats on the like 5" peice of wire that connects to a plug below the TB). Then you adjust the rpms to 650 using the screw on the IAC valve, after you do that you plug back up the throttle sensor. The timing should be set to 15 degrees and when looking from the front of the car the timing marks go 0, 5, 10, 15, 20, 25, 30. You and advance and retard the timing by using the CAS, turning the CAS counter-clockwise will advance the timing and clockwise will retard the timing.
with the fuel deal you need to make sure your base fuel pressure is around 45 pounds without vacuum.
Also you might check into replacing the coolant senor because i know if the coolant sensor with 2 wires is bad then the motor will run like crap. I believe thats because the 2 wire coolant sensor, atleast on the rb20, is the one that goes to the ECU and if it doesnt know the temperature it will use a constant value and fatten the fuel curve. I think thats how it works but i'm not positive
Also since you are blowthru what is your BOV setup.
This is really all i can help you with as of now because you need to make sure that you have the base stuff set before you can further troubleshoot the problem. hope this helps
