wideband is useful, but theres alot to be gleened from reading the plugs.

My fuel rail o ring was torn on # 4. This might be causing that light color.

what brand gas do you use? maybe thats just how it burns?
I use shell the cleaning one, forgot the name.

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I have been using race gas. Sonoco 100 & 110 octanes.

hmm. i mean plugs normally dont lie, but in your case if u run 100 and 110 octane there is no way you are knocking or detenating, esp on 15-17psi. hows your timing? did your distro turn? i dont see how you have that white, hot look to them. i think all a bad o ring would do is seat poorly and risk leaking other than that it shouldnt affect any of this since its outside the combustion chamber. is that fuel leaded or somthing?

a bad oring could have been leaking air and leaning that one cylinder enough to knock. the leaner the mix the more prone to detonation it is, even if its high octane. octane is knock resistant to compression, not knock resistant to heat or a lean mixture. its a different situation. you dont run race gas any leaner than you do 87 octane, its still all gasoline and its stoicheometry is the same regardless of octane. too much air and it will burn too hot and do bad things.

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i highly doubt air will leak in a cyclinder when its forced induction if anything it will blow air out.
i guess we need a pic of all 4 to see if that o ring is whats doing it.

This post has been edited by x_itchy_b_x: Oct 10, 2006 - 12:25 PM

what about when you're off boost and timing is advanced more?

his plug looks just like mine used to. the grounding strap shows a little too much heat (but not as bad as mine are in my 1st pic). the a/f ratio looks ok, but you do see sings of detonation. after dealing with detonation on my car, ill tell you that the 3s is very picky about how things are done, once you go past the stock 10psi. you cant just blindly turn up the boost to 15psi, just because mr2oc says so.

i think jeff has had these plugs in there for a while, and has often run 15 and even 17psi. since they are stock heat range, thats the first thing i would change.

after that, i would highly recommend everyone install the tvsv led's to monitor their knock response, if they plan to run anymore then stock boost. its a great way to know, if a random spike of boost, caused knock or not or of your car is happy with you while you are doing that 1/4 mile run.

but then my plugs should look the same since they are stock denso's and have never seen anything lower than 15psi. and upwards to 20+ a few times.
its all about good intercooling, wich jeff def has with hi W/a and the RC tune.

This post has been edited by x_itchy_b_x: Oct 10, 2006 - 1:44 PM

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hmm... i wonder how a bigger IC would benefit me. ill have to measure my intake temps someday.

hey lagos, whats the normal operating voltage that the car should have to run properly?, i noticed my hks turbo timer has that function and while it read 14.2ish at first, now I see lower 13v's

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anything from 12-14v is fine.

alright, thanks, just wanted to make sure:P.