use the aem coils instead. the only plug you can get with screw off tips are denso iridum, and i wouldnt put those in my lawnmower.

 

whats the reasoning behind that? there are tons of high hp cars that run the cbr coils which are 1/10th the price of aem's coils and are also an inductive coil which from what ive gathered is more beneficial than the cdi aem pencil coil

 

407hp, 93 octane

 

8 heat range is plenty cold for that. you'll foul a 9 out pretty quick unless you are on a road course or something like that

 

around what power level should one start using better/different coil packs? do you need to retune?

 

no specific power level. i generally like to "over do" things. my power goals on 93 octane pump are between 500-550whp without meth

 

aem coils dont require strange spark plugs.

get those okdinndasomething coils or use k-series coils.

 

I used to run the iridium 2668's but they are so much more expensive than the copper 7173's. When I called Ya at IP, he said to just run copper plugs and he said the resistor 4776 plug (I think they are a resistor plug) is what they run but I cant find them anywhere. He said they used to use the nonresistor 7173 plug but have switched to the 4776 plug and its better.

When I did switch to the 7173's, I did notice that I had more misfiring but never saw this with the iridium 2668's I used to run. I just dont want to spend $7 a plug when, if I can find the right resistor #8 plug, will work just as well for $3 a plug.

Will a #8 plug be fine for 600+ whp or would it be better to go with a #9 plug when running e85?

 

my local Bap Geon hates me cause I always lose the PN or box when I need new plugs. I also tried gapping my last ones with a steak knife. My mechanic hates me to.

 

I havent seen enough big hp e85 cars to help there, colder wont ever blow your motor up, so i usually start too cold. If the plug is too hot you will melt things.

I get the 2668's for about $6 bux a piece and they generally last a really long time. I have to change the copper plugs with my oil.