doug

iTrader: (5)

One step colder is going to be less power when running N/A

BrazenZ

Oops mis-read quote

35Z

Chris:

I will email you my Dynojet pulls with those current mods with the stock spark plugs. The 249rwhp/243 max torque was conducted in Jan. at approx. 50 degree outside temp. I would be best if your dyno pull included RPM instead of speed along with torque reading. Best if you knew the engine water temperature when dynoing the car. A timing plot to determine whether the car is pulling timing out due to detonation or not would be a plus. I looks a little lean at near the top end speed. Also, check the O2 sensors connections and the conditions of the sensors unless your going with test pipes (Good idea with spray). The stock 2005 Z's came with wideband O2 sensors.

Additionally, I have a dyno pull that included only the NISMO CAI (248rwhp). The Nismo CAI does not seems to be a issue IMHO.

I would suggest loading the car up with some 100 octane unleaded racing fuel and head back to the dyno on a comparable temperature/humid day and try again. If your numbers increase significantly then, it may be due to timing.

Yes, it is plausible that a colder plug may decrease horsepower IMHO. Also, I would suggest re-timing the ECU with/without spray in order to optimize the Z for the mods.