Spark plugs on FI

[iceman5730]

IPF is recommending the NGKs LTR7IX-11 , or Denso 5340 ITV22, both are 1 step cooler than stock and both need a 0.031 gap with their S/C kit. Factory setting .044
Ihad installed the NGK about 2 k ago and does make a difference in performance Great Plugs

[GPCS]

Originally Posted by BaylorCamaro

told me to use whatever gap "works." So I'm not sure wtf I need to do

Originally Posted by iceman5730

both are 1 step cooler than stock and both need a 0.031 gap with their S/C kit. Factory setting .044

on ANY spark plugs if you gap them smaller they will run colder and if they are gapped larger, they will run hotter at the risk of a "spark blow out" <-google , which is basically a spark plug induced misfire

i would recommend running the largest spark plug gap you can without misfiring of any kind, and no larger of a gap than stock

while checking the spark plug gaps and then regapping for uniformity is a good idea (new spark plugs as they come in the box may have varying spark plug gaps), the spark gap should also be adjusted based on the power output of the motor, with induced misfire as the determining factor, and only as the need arises, go to either a smaller spark plug gap or a colder range plug; both of which if taken too far will also cause spark plug fouling

the OEM acdelco spark plugs are rated for 100k+ miles, of all of the plugs listed in this thread, and especially regapped, you're looking at a third or half at best of that lifespan


i would recommend for the LFX motors:

for anything under 300whp, the OEM acdelco plugs with the stock spark plug gap, with replacement at 50k miles or less

for anything between 300-350whp, the OEM acdelco plugs with a 0.040 gap, with replacement at 30k miles or less

for anything between 350-400whp, the OEM acdelco plugs with a 0.037 gap, with replacement at 20k miles or less

for anything between 400-450whp, the OEM acdelco plugs with a 0.033 gap, with replacement at 10k miles or less

and for anything above 500whp, a denso ITV22, at 0.030-0.032 gap, with replacement at 10k miles or less


if you gap your spark plugs too small or use too cold of a heat range on your spark plugs, you WILL lose power at part throttle and in extreme cases, cause idling problems such as stumbling or poor idle quality

smaller spark plug gaps for the sake of smaller spark plug gaps will not improve performance, and will negatively affect combustion efficiency, which you want as efficient as possible, for better power output, less misfiring, better fuel efficiency, and less carbon buildup in places you don't want carbon buildup

[BaylorCamaro]

Originally Posted by GPCS

if you gap your spark plugs too small or use too cold of a heat range on your spark plugs, you WILL lose power at part throttle and in extreme cases, cause idling problems such as stumbling or poor idle quality

smaller spark plug gaps for the sake of smaller spark plug gaps will not improve performance, and will negatively affect combustion efficiency, which you want as efficient as possible, for better power output, less misfiring, better fuel efficiency, and less carbon buildup in places you don't want carbon buildup

Interesting. Admittedly my knowledge on the spark plug and different gaps is minimal. I am currently at a 0.035 gap and my idle seems like it wants to stumble & has poor quality like you have suggested. I also had a random misfire on cylinder #6 the other day when I was leaving idle and had part throttle. What is more interesting is I just spoke with Vince and his suggestion (like IPF) is to gap down to 0.032. I suppose I can test our a larger gap and see if I have spark blow out or not.

[HBMike]

Denso Iridium plug: 5340 = ITV22

.8mm gap

car runs great

[V6owner]

Wow that is a BADASS mother Fuking picture

[PoorMansCamaro]

Yeah it is!!!! Holy chit!

[Ventmaster]

Denso recommends a 30K mile replacement on the 5340-ITV22, but mine did require a re-gap down to 0.031 (0.8mm).

[Vader2011v6]

Couldn't find the denzos but was able to get some NGKs. Did the regap to .032. I will get to see tomorrow if it helps out.

[BaylorCamaro]

As an update, before I got rid of my V6 I opened up my gap to about .038 and my idle got significantly better and I still didn't have spark blowout. So my point is what works for one tune or car may not for another..

[wutshotDJroomba]

Originally Posted by HBMike

Denso Iridium plug: 5340 = ITV22

.8mm gap

car runs great

hah, bought that magazine the other day, the article on your Supercharged RS has inspired my FI build.

[Vader2011v6]

Originally Posted by wutshotDJroomba

hah, bought that magazine the other day, the article on your Supercharged RS has inspired my FI build.

What magazine is it? I would like to read up on it as well.sweet picture.

[wutshotDJroomba]

Originally Posted by Vader2011v6

What magazine is it? I would like to read up on it as well.sweet picture.

Magazine is called CAMARONOW Magazine. That issue has an article about Camaro5 fest as well as great How-To articles, it was nice to see a little V6 love on the cover.

[MrGood]

Originally Posted by HBMike

That is a bloody wicked looking car.


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[Black Knight]

How are the spark plugs working for you guys are the Denso still the best choice .found these online http://www.sparkplugauto.com/denso/i...FQwIaQod_74AZA