ok everyone i have a 2005 evolution 8 2800 MILES, with the following mods:

aem short ram intake
greddy type s blow off valve (single spring mod done)
hks 280 cams
greddy profec b spec 2 electronic boost controller @ 21 psi
megan racing EXHAUST::::
3" O2 housing
3" downpipe
3"cat delete pipe
3"cat back without the silencer
WALBRO 255 FUEL PUMP
PERRIN 02 SIMULATOR

turbo trix tune dynoed at 345 awhp and 300awtq

my question is i want to change the plugs and i already got the ngkbpr8es are they ok to put in and if not what plugs should i go with on this setup?

Thanks

 

bump

 

why change so soon? the life for the stock iridiums just began!

 

with the 100 hp over stock i thought it might be a good idea but maybe not

 

I say to keep a set of NGK BPR8ES _handy_ in case you start experiencing any problems at full boost with the spark blowing out. If so, then swap 'em in with a .25-.26 gap. Until then, I'd keep on truckin' with the stock ones, since they're Iridium and will last a lot longer than the copper NGKs you got.

Btw, I am doing the same thing...I currently have a set of BPR8ES in hand if and when I need them, but I won't be changing them randomly.

 

im running them and like them alot better then stock

 

NGK that's what i run, but he is right why change

 

What's the rule of thumb for the mileage to change NGK BPR8ES spark plugs?

 

3-5k miles or whenever you change your oil?

 

I replaced the stock Iridiums at 10k with NGK BPR7EIX (Iridiums).... Im still wondering if Im better of with copper NGK BPR8ES bc it seems many peole are running them with sucess?

 

Look into Denso iridiums. I believe they have plugs for racing application that run hotter.

 

you got cams and running in high boost better use the NGK Iridium IX BPR7EIX and gap it between .028 and .029 in.

 

The stock iridiums will run fine until about 430 whp (Dyno Dynamic) then you will need the NGK that you have and gap to .23 to .25 if you're making more power since you will experience the spark blowing out making your car shaking. I got the same problem and replacing the plugs with gapped cured it.

 

What's the change intervals for the NGK Iridium IX BPR7EIX? How do they compare with NGK BPR8ES spark plugs

 

BPR7EIX - Same-as-stock Iridium heat range "7" and last a long time (30-40k?) but fairly expensive.
BPR8ES - Copper one range colder (8) and last 5-10k miles depending on use and very cheap (<$2/pc).