Can anyone tell me which spark plugs will fit the EVO IX that are 1 step colder? I have searched and haven't foound anything besides greddy and HKS making them and them costing $100 for a set. Aren't there any NGK's Iridium's or coppers that are 1 step colder that fit the EVO IX?

thanks.

 

Same as stock, but with an 8 instead of a 7... Why do you want colder plugs?

 

Axiom Power was selling some:

Axiom Power

 

If the mods you have are only the ones in your sig then you would probably be better off with the stock heat range plug.

 

got mine from axiom power: IKH24 denso iridium

 

+1, I got the one step colder plugs when i added meth to all the bolt ons i have

 

I also added them when i got meth but they didnt last long the car was misfiring on the dyno up top so i went back to stock heat range and got rid of the misfire. Got my step colder plugs from axiom power

 

ive been lucky so far in terms of misfires...a friend of mine with a ix has the stock plugs and meth and is fine

 

There is tons of plug info on here. Here are a few threads to start:

https://www.evolutionm.net/forums/sh...d.php?t=165134

https://www.evolutionm.net/forums/sh...ighlight=plugs

https://www.evolutionm.net/forums/sh...ighlight=plugs

https://www.evolutionm.net/forums/sh...ighlight=plugs

https://www.evolutionm.net/forums/sh...ighlight=plugs

Personally, I prefer NGK...and they make about every plug you could possibly want.

Cheers!
Ethan

 

I recently got a m1 flash from jestr, and it was knocking a bit so figure to take care of that i should buy a set and throw them in there to see if it helps a bit. I was considering coppers, any part specific part numbers on these plugs?

Axiom power is charging a bit much last time i requested a price for these plugs so thats a no go...

 

Again, most of those threads are for the EVO VIII plugs which dont apply to the IX...but thanks though!

 

I'm sure the "knock" we saw in the log was more due to the tune being "in the rough" for your combination, but mostly the COLD air. I'm sure Jestr will get you another image that will take care of that. I've seen higher knock counts on a stock flash/stock Evo in the cold air that log was done in... I'd shoot an Email to John.

 

I did send him an email and talked to him via AIM, and he said he had sent you another flash, have you gotten anything?

 

HKS Part number: S40iL
OE NGK number: ILFR7H

Stock Plug= NGK ILFR7H Stock #5245 LINK
Step colder= NGK R7437-8 Stock #4901 LINK
2 Steps colder= NGK R7437-9 Stock #4654 LINK
3 Steps colder= NGK R7437-10 Stock #4655 LINK

NGK ILFR7H (OEM) Iridium
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=20451

NGK LFR7AIX Iridium
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=16602

 

Although there is limited discussion on IX plugs, the info applies to choosing brand/type of plug and discusses the need for changing heat range...which applies across engine types. It's also to show that choosing plugs should be the product of careful research and consideration of needs/design.

That said...you're welcome, and good luck!
Ethan