That NGK plug is simply the current OEM plug that Honda uses in the S2000. It is not a direct replacement for the IK24 since the the IK24 is one heat range colder. Also, those NGK plugs are platinum.
ps. Many supercharged S2000 have been running on stock plugs with a narrower gap. Only if the car is used where the engine is worked hard and can get very hot, do you actually need a colder plug. Not a bad idea to have a colder plug but not absolutely necessary.
Although you never take for granted that a "pre-gapped" plug is correct (always check before installing), those are gapped for the stock application. You need a much narrower gap for F.I.

 

Platinum retains too much heat and that's why it shouldn't be used with F/I since it generates extra heat. Copper and iridium for S/C or T/C.

 

Im having idle issues so I think I will try the NGK BKR7E's. My mechanic said the same thing about not using non reistor plugs. That NGK part number says that its equivilant to the IK22's. Is there another one comparable to the IK24's?

 

OK I need to resurect this thread because i'm ordering plugs today for my car. (Comptech supercharged 7LB non AC)

I was checking what people said on here about the NGK7173's and also BKR7E's. Upon reading the specs of both I found that the 7173's are a heat range of 8 and the BKR7E's have a heat range of 7...

I was thinking that both were one step colder than stock, but it doesnt seem so..
Can someone clear this up for me?
I was about to order the BKR7E's but want to make sure before I order them that they are what I should be getting.

Thanks guys

 

yes, get the bkr7es

 

I with a bunch of other members are running the 7173's without any problems so I think that you can run either one and be fine.

 

Is one plug colder than the other though? It seems that by what I read on summitracing that one is a 7 and the other is an 8 as far as heat range...

I have no clue what heat range stock is...

 

Anyone?

 

From what i read the BKR7e's are 2 steps colder than stock. I just ordered 12 of them. Im putting them in this weekend. Ive been having idle issues and occasional radio engine noise and hope the new plugs solve the problem.

Why not to use non resistor plugs
http://www.ngksparkplugs.com/techinfo/spar...1200&country=US

 

I've just done some research and it seems they (BKR7E) are the same heat range as stock (7)


the 7173's everyone talks about are (8 one step colder)
the 7405's are (9 two steps colder)


They seem to not carry (summitracing & sparkplugs.com) a BKR8E which should be a heat range (8)-one step colder than stock.

That is why I assume that everyone just uses the 7173's...