I'm replacing the stock NGK LZFR6AI with one step colder NGK LFR7AIX. I notice the cold plug (on the right) measures 0.060" shorter than the original from gasket surface to tip of electrode. I'm worried about less protrusion into the combustion chamber: is this a problem?



So, I contact NGK technical services about this discrepancy and they replied right away: it will work fine.

Just thought I'd share.

 

I recently switched to those same plugs. And I havent had any problem. In fact Ive noticed Ive been getting better gas mileage since I switched over. I use to only get 21-23mpg on the regular and now im getting 23-25mpg.

 

Since you two are switching, I will switch to these plugs on my next tune-up

 

Thank you, Bakuro

and rzrxn i bought mine online from http://www.clubplug.ca/
Free shipping right now and excellent service! If you try to buy from Crappy Tire or someplace they get all weird about it and get you worried because it's "special order" and not stock and their on-sale prices don't apply to this part number.

 

Been running these for 2 years now, great plugs. Only had an issue one time because I apparently didn't tighten them down very well. Had corrosion everywhere

 

im running a turbo and what do you guys think of these spark plugs. Yes im running a fuel additive. It looks like im running rich what do you guys think. Thanks.
http://imageshack.us/a/img543/9644/24dn.jpg
http://imageshack.us/a/img832/6700/1zc3.jpg

 

Crappy in Trenton and Belleville doesn't even carry our OEM plugs...i've always had to buy plugs online...

how old are those plugs? looks rich, and hot...lol

how's your tune? what what's your gap?

 

with any luck you gapped the plugs, in the pic the new plug doesnt look gapped at all--hence the shorter length.

 

no, it's the length from the washer to the end of the threads that is shorter, and the newer plug also has a smaller gap out of the box, if i remember correctly, the OEM plugs are .038 and the colder plug is .030

 

You are correct sir. I measured them side by side when I pulled mine. I left the new ones gapped at .030 too. Car has seemed to like them.

 

I think the gap is .30 or .29 and i just got the plugs about a month ago and my heat range is ok because its on the middle of the strap. And thats what i dont get my narrowband gauge says lean at wot but it dosent show it on the spark plug at it ever going lean. And yes i know NARROWBANDS SUCK lol.

 

lol, you have no business tuning a turbo car without a wideband...

that golden brown could very well indicate a lean condition, but the black **** on the thread is throwing me off...

get a wideband and start data logging before you make confetti out of your pistons, and throw a rod through the block...

 

What exactly does a colder plug do? Compared to the oem plug?

 

I did a quick Google search and these are what i found

http://www.e3sparkplugs.com/news/hot...park-plugs/326

http://www.ngksparkplugs.ca/tech-info-spark-plugs.cfm

Enjoy!

 

Thank you