spark plugs

[eyz closd]

does anyone know the best spark plugs to get im running ngk iridium rite now and im not to sure of the heat range of the plug and i think its better to go with a plug with a heat range that is colder than stock since im running higher boost on a bigger turbo.. so can anyone tell me a spark plug that is like 4 steps colder than stock spark plug

[91MR2NASTL]

if i remember correctly, iridium is hotter than the stock plug, and i think copper is colder? i always get that confused. im using the double platnium densos at the moment adn they rule.

[JekylandHyde]

You do not want an iridium plug in the MR2.
Several owners have had the tiny electrode snap off and damage pistons and/or valves.

Run the NGK Coppers #6097.
They are one step colder than stock and super-duper cheap
Just change them every oil change.

[eyz closd]

ight thanks to all the replys.. and j & h do you know of any plugs that are colder than the ngk coppers because i want a plug that is 2 to 3 steps colder than stock.. and do u use the copper plugs in your car?

[JekylandHyde]

I am using the NGK coppers 5030 ... very similar plug to the NGK 6097s.

Why do you want to go two steps colder? ... there are MR2s out there pushing 400-500 rwhp on the NGK's I referenced.

[eyz closd]

alright thanks j & h.. the plugs that you are running are they better than the ones you reffered

[MRQtwinturbo]

i run 6097's and also change them frequently.....and i'm at around the same power level as J&H but will bordering closer to 400rwhp next spring....

[JekylandHyde]

The only difference between the 6097 and the 5030s is one of theem has resistor. The 5030s could "possibly" cause interefernce with your stereo ... I have no stereo

MRQturbo, I should also be well over 400 RWHP by the spring

[eyz closd]

the 5030 do you have to change them frequently as well.. and for the other ones you have to change them every oil change?