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Old 11-08-2017, 18:44   #1
Cyberstaff
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Spark Plugs

Ive just finished making my own cop kit for my evo 9 and am ready to fit the weekend. I could do with changing the plugs at the same time.

Ive currently got NGK IR ILFR7H plugs. I was advised on NGK BR8ES plugs but i believe they are only suitable for the 7,8ect.

What pugs are people running or recommend for a 9?

Also what should i gap them to?

Evo 9 running 405/390.

Thanks
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Old 11-08-2017, 19:03   #2
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If you want to go a step colder (from 7 to 8) then the Denso IKH24 will do the job. I've run the 9's (IKH27) for the last few years. They're way cheaper than the NGK racing plugs which are the only other option I know of for the 9 due to the requirement of a longer plug.

I do have a new set of the 24's sitting in my toolbox I can post for £30?
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Old 11-08-2017, 23:39   #3
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If you want to go a step colder (from 7 to 8) then the Denso IKH24 will do the job. I've run the 9's (IKH27) for the last few years. They're way cheaper than the NGK racing plugs which are the only other option I know of for the 9 due to the requirement of a longer plug.

I do have a new set of the 24's sitting in my toolbox I can post for £30?
What power are you running bud? How do the Denso plugs rate?
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Old 12-08-2017, 16:53   #4
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A bit over 500hp, no issues to report.

HKS rebrand these Denso plugs and triple the price
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Old 12-08-2017, 18:26   #5
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Cant go wrong with NGK. I think I read somewhere of Denso plugs breaking up. Stick with NGK Iridiums
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Old 12-08-2017, 21:27   #6
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If i stick with NGK and go one step colder they are 120 a set
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Old 12-08-2017, 21:37   #7
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I recommend denso ikh24.

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Old 12-08-2017, 21:44   #8
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I use NKG R7437-8 racing plugs on my 9 with a COP kit too
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Old 12-08-2017, 21:59   #9
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I recommend denso ikh24.

Mark
Think this is what I'm going to go for.
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Old 12-08-2017, 22:11   #10
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Don't rate Denso have had a couple misfire issues in the past that we're resolved with switching to NGK and there are horror stories of them dropping tips.
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Old 12-08-2017, 22:21   #11
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Don't rate Denso have had a couple misfire issues in the past that we're resolved with switching to NGK and there are horror stories of them dropping tips.
Are the colder race plugs worth the money though? or should i stick with stock plugs on a cop kit?
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Old 12-08-2017, 22:24   #12
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Quote:
Originally Posted by Simon9300 View Post
Cant go wrong with NGK. I think I read somewhere of Denso plugs breaking up. Stick with NGK Iridiums
Ive heard and read the exact same thing, but about the NGKs. Also ive had ngk Iridiums in the past and they have not lasted long, also they have caused misfire in a previous car.


Then ive used denzo and now the hks racing plugs and no problems. When i bought my evo it had brand new Ngk Iridiums after 2000 miles i was having slight misfire witch turned out to be a plug. Then i replaced with Hks racing plugs, driven 7k miles and no problems, still going strong.

just my 2p.

Last edited by MrEvo665; 13-08-2017 at 12:33.. Reason: added info
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Old 12-08-2017, 23:54   #13
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Quote:
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Ive currently got NGK IR ILFR7H plugs. I was advised on NGK BR8ES plugs but i believe they are only suitable for the 7,8ect
Why on earth would you want to go from a plug with an iridium centre and a platinum ground, to a common garden nickel/nickel plug, apart from cost?

Select heat grade to suit your engine and combustion temps, nothing else.
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Old 13-08-2017, 00:06   #14
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Are the colder race plugs worth the money though? or should i stick with stock plugs on a cop kit?
The heat range of the plug has nothing to do with it being a precious metal plug. You can buy a heat range 7 race plug, or a heat range 9, £3 copper plug.

The expensive race plugs improve service life and efficiency + reliability of the spark under severe conditions in a high boost combustion chamber.
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Old 13-08-2017, 07:33   #15
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Don't rate Denso have had a couple misfire issues in the past that we're resolved with switching to NGK and there are horror stories of them dropping tips.
Surely this is a Kentucky Fried Rat story?? I'm sure any plug can drop a tip, especially if it is over-tightened

I'm running a COP kit and 0.6-65mm gap at 2 bar with no issues, maybe the gap was a little wide (std 0.7mm) when you had them in yours?
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