4306 if your gonna turn up the boost. even still 4306 ftw!

 

I run the 4306's with my s2 and have never had a problem. Lots of guys running 50-trims run them as well. Most people with issues with the iridiums go back to the 4306's and usually have better success with them...this isn't to say the iridiums are bad plugs, just usually not worth paying 3x more. I would recommend you trying the 4306's next time you switch out the plugs and gap them at .032" and see if you notice any difference. They're only $10 at NAPA so it's worth a shot. Also, I change my plugs every 3-4 oil changes.

 

yea i might try them..

 

On a recommendation from Darryl Cox, i switched to the irridiums (1 step colder) from 4306's.

So far so good. My car idles MUCH MUCH better and is running great!! I did change to a Accel coil as well, so i can't say for sure if it's the plug/coil combo, just the plugs, or just the coil that is making my car run smoother and acelerate better.

DCR stated they gained 3whp increase with this combo. Don't take my word for it, call nubz and ask him:readclose

 

yea i hear u there..my car has always ran fine with my 1 step colder irdiums that i get from modern performance..i have 13k on them now..im just wondering at what mileage should i change them?

 

I actually went with 2-steps colder irridiums from 4306s at the recommendation of AGP for my set up. The car has been working well with these plugs.

 

The iridiums may last a little longer then the Vpowers but there is not a performance adavantage between the two. Over 400 whp you should go to a step or two colder plug. You can go 50,000 miles on them, the only issue with spark plugs on a turbo motor is the spark plug gap widens up.

 

Yea my idle went to poop with the iridiums for some reason, but the upper rpms are smoother with zero blow out (got a tad with the 4306's at 28psi even at a .030 gap).

 

yea i have 13k on my 1 step colder irdiums from modern performance,with no issues at all..i need ur guys oppions..at what mileage should i change them?

 

I live by 8k for iridiums, 5k for 4306's.

 

what is the difference between the ones that are on Modern Performance (iridiums) and the NGK 2669 (bkr9eix)

 

hhhmmm, am I the only one who changes out my spark plugs every 3000 miles when I do my oil change?

 

I have the NGK iridium 2315's or LZTR6AIX-13.. They have worked great for me so far. They are a step colder then the 4306's...

The iridiums may last a little longer then the Vpowers but there is not a performance adavantage between the two. Over 400 whp you should go to a step or two colder plug. You can go 50,000 miles on them, the only issue with spark plugs on a turbo motor is the spark plug gap widens up.

That's on any car, turbo or not, they wear.

 

anyone know the answer to my ?

 

Stick with the ones you have now. They should last a long time. When/if you go big turbo, go another step colder to the ones I got... At least that's my suggestion.

 

well its my daily driver..i drive it hard i say about 25% of the time..if i take out the plug how can i tell if its going bad?

 

i change plugs like every 1k-2k miles.

 

I changed my plugs every oil change and regapped them after every pass at the track.

 

i think its alittle essesive to change the plugs every oil change..i have had my iriduims in for over 13k now with no problems

 

and im sure you arent running nearly as much boost daily nor hp range as i and a few of us...

 

4306s, I change the plugs about twice a summer.

 

my stage 3 likes iridiums better than 4306's.
just sayin'.

 

part number on iridiums?

 

2 step colder Iridiums are a night and day difference over the 4306s in my car. Idle is much smoother and no blow out. The 4306 always blow out on me.

 

part number?

what the hell range is the NGK BKR9EIX (stock 2669)???

 

1 step colder lztr6aix-13 iridiums..i get the from modern performance