Interesting... I personally have had no issues. Then again, I've still yet to track the car and keep it under sustained load for longer durations of time. I am looking at other options as we speak though. I'm doing this mainly, just because that is what I do...

 

do we need a hks twin power or aem sorta of sparks amplifier for a colder range spark plugs on a modified engine?

 

I think it might be time to change the plugs on my car, but i am unsure of which plugs to get with the mods i have. can someone point me in the right direction. Mods are in sig.

what would be the gap as well for those plugs (except iridium which i see come pregapped).

thanks in advance for the help!!

 

I just wanted to add I tried the Denso IW24's and I got a lot of misfire in the low to mid rpm range. I guess a colder plug wasn't really needed. I'm back to NGK BPR7ES @ .025 with 0 problems.

 

nice post, i was just talking about plug choice with a couple tunners!

 

bump for any advice!!

 

Plenty of advice on this thread among others. I recommend starting with these because they are cheap and easy to find locally:

NGK BPR7ES
NGK BPR8ES

1 step colder plugs mis a lot in my car. I also have a HKS DLII ignition with stock coils. Both of these plugs are copper so they need changed pretty often.

 

Anyone went from BPR8ES to IW24?

 

fugiwara thats gonna be my next spark plug swap, ive had my bpr8es in for about 20k, i know i know far past due, but ive got a non cdi coil on plug, since im runnin 27psi on 91 octane, i figure swappin out mine for some iw24s, should take care of it.

 

Did you make the switch?