High Performance plug gaps

[LETZRIDE]

I got some NGK iridium's in the car right now at 0.055 gap (I think TR55's)...anyways I'm not exactly liking them that much...seems to me the car may have a slight misfire at higher rpms....it just seems that above 4000rpm or so if you let off the throttle you hear alot of unburned gas popping away in the exhaust

High rpm underload doesnt sound the greatest either...plus my afr's have plummeted from being 12.3x at WOT to about 11.5ish at WOT....I'm thinking this has to do with the plugs.

I remember when I first got the cam in I just threw in some crappy copper plugs gapped at the factory 0.060 and it did not like it...I regapped them to about 0.055 and the car ran much better.

Anyways, my question is...can I gap my plugs to 0.045 or 0.035 N/A and be ok? Is there any negative to doing this? I'm leaning more towards the side-effects of potentially causing KR? or increased cylinder temps that could damage something?

I'm wondering if the higher cylinder pressure (9:9:1 CR and cam) are just too much for a 0.055 gap?

[whitdog54]

Re: High Performance plug gaps

id run tr6s then regap from there if needed.

[LETZRIDE]

Re: High Performance plug gaps

I've read that those plugs don't build enough heat to clean themselves N/A...I'm probably going to go to a copper plug from ac delco and gap it to 0.045 in the morning when I get in from work.

[ssms5411]

Re: High Performance plug gaps

I've been running TR6's N/A for along time without problems but I might go TR55's gaped at .055 after the new headers go on and see about doing Auto-X.