I know there are many things about what spark plug to use but i would like to know when to run a colder plug.

I have cams, springs retainers, o2 housing and full exhaust, also fuel pump. Should i go to a colder plug?

I see that STM's website says the BPR8ES is one step colder and the BPR9ES is for highly modified cars with lots of boost.

Should i try to go to a BPR8ES on my car? I wouldnt consider myself highly modified or running alot of boost(tuned for 26)

 

At your power level I would suggest a BPR8es or a BR8es.

-Em

 

if you had an 8 with more mods, i would say colder plugs. with a 9, stick with stock plugs unless you're heavily modified.

if it isn't broke (misfires, etc) don't fix it.

 

My fault. Did not realize this is for a 9.


We run these with good luck.

http://www.streettunedmotorsports.co...ium_ilfr7h.htm

Hope that helps.


-Em

 

Thanks Emery, i was going to shoot you a message on facebook to see what you would suggest.

 

Is there a way to know when you need a colder plug besides HP?

 

Thats kinda what i was trying to get at. At what point should you go to a colder plug? Boost level? HP level? Mods done?

 

I just ordered a set of Denso IKH24 ill let you know how they work.

 

What made you pick up some Denso's? I have run NGK in all of my DSM's that were for many different driving purposes. They have never let me down.



On a side note, I thought the BPR7es were stock and BPR8es were colder, for higher boost and such. At least thats what the parts are in the DSM world.

 

I read a few posts on people using the Denso's and they liked them. The ones i bought are a step colder. And the 7es and 8es are for evo 8 i have an evo 9. From what i read they take a different plug because of MIVEC

 

There are a few problems with most of the spark plug discussions on evom.

1. People fail to understand that the Evo 9 and the Evo 8 use a different plug, and respond to a heat range change very differently (or so I'm able to surmise).

2. People when offering advice on plugs fail to say whether it worked well on an 8 or a 9.

 

I have always used bpr7es copper plugs since modding my Evo 8. I never went to a colder plug even at 500whp. I may try it next summer to see if it makes a difference.

 

They are great plugs.

I always try to run stock range plugs. You don't want to get to cold of plugs. On E85 at 750whp and 40+psi I am still able to run stock plugs with no problem. If you are trying to make high hp/boost on 93 than I would go a step colder. On E85 we usually run stock range.

Mikey