Which Spark Plug Heat Range?
Here and there I am reading that it is best to use a plug one step colder than the "book" says. I am looking at getting NGK iridium IX, and wonder if I should go one step colder. My engine is in stock condition. I would like to hear from people who have done this with success.
Also, I called NGK because I wanted to understand the difference between the "iridium" plug and the iridium IX. Well the plain irridium is a longer lasting plug, and uses platinum on the ground electrode. But the IX was developed for performance, and does not last as long. The IX is also less expensive. Gotta go for the performance !!!!!!
1992 green ssei. Tan leather, moonroof, power everything. 161k miles
Goodyear RSA Plus 225/60/16 VR on chromed factory crosslace rims. McGard chrome lugs.
Audio system: CD player w/equalizer, subwoofer (all stock).
Delco premium wires, NGK TR55 plugs, K&N stock style air filter. Ceramic brake pads. New rear brake tubing and proportioning valves. New wheel cylinders, front rotors and calipers. New front wheel bearings. Replaced crank sensor and harmonic balancer. Rebuilt instrument cluster. Cleaned A/C evaporator. Valve cover gaskets. Alternator. Front stabilizer links. Replaced all power steering lines and transmission lines. Cleaned MAF and IAC. New door appliques. Rebuilt steering gear. CERAMIC brake pads, I love them. I am listing all this in case someone needs advice on any of these repairs.