i have a 90 crx si, the sohc d16, its stock except for 8mm plug wires and i opened the intake up some, right now im running a hotter ngk plug and im going to change plugs tonight, should i go with the same hot plug or should i go with a colder plug? i use to know all about plugs but when ive been away from it for 2 yrs and this isnt a 2-stroke so its a lil different, all your opinions would help, thanx

 

Id go with the hotter plug. if your ignition is stock it sucks *** so you need all the help you can get. I put in some accel plugs, cheap but effective. when i get new ones im switching to NKG because they burn hotter and my 1.5 needs all the help it can get

 

It all depends how you drive the car. I would take a look at the old plugs first, and that will tell you what to do. If they have a tanish color, just go with the same heat range. If they are a little built up with carbon, step up a heat range.

And chefcris420, hotter plugs will not make your spark any stronger. The only difference between the different heat ranges is the porcelain on the plug. On a hotter plug, the porcelain doesn't go as deep into the plug, so it heats up faster. This makes the carbon burn off easier due to the heat. The only problem, is that if you get a plug thats TOO hot, it will do 2 things:
1) it will destroy itself by either melting or cracking apart, and
2) it will remain so hot that it ignites the gas before the plug even fires, which is not a good thing
Do yourself a favor, and don't get plugs too hot unless you really need them.

 

I would just use the NGK plugs that Honda recommends.

 

in my experience until you go forced induction stick with either a 5 or 6 heat range plug. also stick with NGK or Denso plugs. hondas don't seem to like bosch at all, or any other plug for that matter.