I want to throw in a new set of spark plugs but what are the best ones to go with. Is it alright if I go with a one step colder plug on n/a. I have plenty of mods.

 

How about Denso Iridium?

 

Do you have a part number.

 

IKH16 but if you want run it little colder, I think its IKH20 and if you wanted to run even colder, I think its IKH22

I installed IKH16.

 

Where did you order the plugs?

 

Whats the difference, and what is safe to run.

 

I ordered it from:

LTB Motorsports
772 Washburn Rd #C
Melbourne, Fl. 32934
1-888-346-7266


Name Code Qty Each Options
---------------------------------------------------------------
DENSO IKH Series: DENSO IKH16-5343 6 11.25
IKH 16
Subtotal 67.50
Shipping 4.99
Tax 0.00
Total 72.49

 

Higher the number, colder the spark plug is. If you have lots of mods go with colder plugs like IKH20 or even IKH22. Especially if you have supercharger or turbo which makes the engine really HOT. Other than that go with IKH16 which is pretty standard. Thats what I got.

 

Do you know if the ngk plugs are good.

 

does it run smoother with the denso's?

 

Do you know if you have to take the top intake off to repalce the plugs?

 

No! You will however be loosening some things to get to the plugs. I got my Denso from: www.clubplug.net

Some site with info on Denso:

www.densoiridium.com/powertechnology.php

www.denso.co.jp/en/

 

Which denso's did you go with and is it ok to go one step colder with the mods I have. nismo exhaust,test pipes,nismo headers,cai,pulleys?

 

NGK' Iridium's are very good too except that Denso has finer tip.

I had NGK Iridium installed on Acura TL.

Both Denso & NGK are great spark plugs.

 

It seems like it does. When I had the Iridium Spark Plugs installed on my TL, I did notice right away.

As for my Z, I had oil change & spark plugs changed including
K & N Air Filter & Nismo Headers.

My car seems smoother but like I said I had few things done all at once.

 

I only saw my mechanic installing the spark plugs and it seemed complicated. He had to take off lots little parts.

Than again, I am not an auto mechanic.

 

Thank you for all the info and help.

 

There was a learning curve the first time. Did the same thing for a friend the 2nd time and it probably took 1/3 the time. You will be removing your OEM Air Intake. Find each coil and then determine what must be removed or pulled back. The wires leading to the each coil have a snap type connector. Disconnect each and it is easier. I was able to loosen things, thus avoided cutting wire straps. Put some "duck tape" between your socket and extention. It will insure they stay connected. Good Luck!

 

Stick with the PLFR5A-11 OEM plugs.
The spark plugs sit in a water jacket in the engine block. The colder sprak plug actually will put more of the plugs heat into the jacket which will raise the water temps even more.
As soon as the ECU see's a high water temp it will really start shutting the performacne of the car down.
Missfires and problems with the VVT will happen with high water temps.

 

Hey dwnshift,
Are you saying that we shouldn't change the brand, or just the heat range? I understand that we should stay with same heat range so I ordered NGK irridium plugs in the factory heat range.

Have you guys had problems with OEM heat range aftermarket plugs?