I changed my spark plugs last Friday with NGK Iridium plugs. I didn't think it would change anything but man was i wrong. I swear the car is completely different now, tons of power and doesn't slightly plateau at 4k like before. The old plugs looked fine, a little brown but good. One thing i did notice was the old plugs had a larger gapping then the iridium.

 

you did set the gap, right?

 

Same. When the engine was out I had them change the plugs. Definitely a difference in power. Even Ashley agrees.

 

[quote=RMADERMAN]Same. When the engine was out I had them change the plugs. Definitely a difference in power. Even Ashley agrees.
you had your engine out.....missed that...I have the plugs, just need to get her done alone with a host of other mods to put on.....come on good weather...get me in the mood...

 

does the engine HAVE to be out to change the plugs?

 

I guess the plugs are an easier change with the engine out.

I installed these as well and will agree. The difference is noticable.

roadster with a stick

 

No Howard, but it is easier when it is out.....lol

 

NGK says the Iridium plugs are not an option for our cars. Would the Laser Platinum plugs be a better choice?

 

You dont have to gap iridium plugs. And i didn't own the car when the last ones were installed so i dont know if he gapped them right.

Me and my buddy were actually joking about how the hell the MB techs changed the plugs, cause they are a major ***** to reach and remove, and he jokingly said maybe they pull the motor. lol

 

I dont know why it says that, I just walked into Autozone and got 12 for my car. they didn't say anything about not using it on my car. Are you saying they are not a option for the SRT?

 

hey could you get me a part number for the iridium plugs and a unit price? im at 40k and id like to replace my plugs with iridium ones, i really wanted to go bosch but is NGK just as good? thanks! JR

 

I really don't know. Clearly, some people here have used them and are getting great results. However, the manufacturer does not recommend them for our cars. I don't know what the issues are, if any, with using these parts over the recommended ones. Perhaps someone who knows more about spark plugs can explain.

 

Are they the same plugs that Needswings has on their site. I imagine they are. Inquiring minds would like to know.

 

part number through Autozone, 4696 Ngk-Laser-Iridium / Spark Plug

 

I have been using 1 step colder Iridium plugs in the Aero SRT6 for almost 2 years..... I think it likes them...

 

Thats not what NGK says;
3. Gapping
Since the gap size has a direct affect on the spark plug's tip temperature
and on the voltage necessary to ionize (light) the air/fuel mixture, careful attention is required. While it is a popular misconception that plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings (to ensure ignitability
in these denser air/fuel mixtures). As a rule, the more power you are making, the smaller the gap you will need.

 

Call me old fashion, but I will check and gap mine....lol

 

I pulled the stockers out cleaned and regapped them to 34 ( i think) last Oct. before heading to the track. I think it made a difference, atleast lowering the gap should have helped.

 

When I installed mine they measured about .039" out of the box... I gapped everyone of them to .035"...

 

Thanks Mike, now I know what to gap them at .....lol