The Sparkplug thread

[el_jefe]

We know that the PVO engineers recomended the NGK 4306 plug for the SRT, what do you use?

Let's try this format to make it easier to find what your looking for.

Plug
The plug you are using

Mods
Mods used with that plug

Stats
1/4 mile times, dyno pulls, data logs

Mileage
How long the plugs lasted before they needed replacement.

Comments
Anything else to add?

[el_jefe]

Plug
NGK 4306 gapped to .35

Mods
Stage 2, PCM controlled, 3" exhaust, MSD wires

Stats
N/A

Mileage
I seem to get around 10,000 before I get stumbles and starting issues

Comments
These are hard to find around AZ. I hate having to order stuff

[punkrokdood]

Plug
AGP whatever they are

Mods
both stage2+bolt ons and stock

Stats
N/A

Mileage
A lot... but they're about ready for a change

Comments
too expensive

[Stage2BlackSRT4]

Few good posts on turbododge by Blackbird

http://www.turbododge.com/forums/f11/f39/117232-spark-plugs.html

http://www.turbododge.com/forums/f11/f39/117232-spark-plugs-2.html#post988909

[el_jefe]

Few good posts on turbododge by Blackbird

http://www.turbododge.com/forums/f11/f39/117232-spark-plugs.html

http://www.turbododge.com/forums/f11/f39/117232-spark-plugs-2.html#post988909


That's what I was looking for, but couldn't find on any of the SRT sites, so I started this thread.

[srtowner]

Plug
NGK 4306

Mods
Stage 2, direct port W/M, PTP FTM,PTP hard pipes including charge pipe,ported intake,Taylor plug wires,screamin deamon coil,55mm ptp tb,BDJ's 3" dump exhaust,apexi avcr bc.,DCR oil mod,IJ crank scaper/windage tray,.......oh yeah then there is the AGP 50 trim setup.

Stats
no new 1/4 times,383@22psi w/o w/m injection and 8.5 degrees knock retard due to bad sensor.

Mileage
5,600 so far

Comments
love them.

[Neverenuff]

[QUOTE=el_jefe]We know that the PVO engineers recomended the NGK 4306 plug for the SRT, what do you use?

Let's try this format to make it easier to find what your looking for.

Plug
NGK 4306 gapped at 035
Mods
Stage 3 w/toys basically all the bolt-ons

Stats
Last dyno was 379 hp 382 tq. I have added a AGP stage 3 wastgate and a DCR 55mm throttle body and spacer since, so I am hoping to be at 4xx hp and tq now.

Mileage
How long the plugs lasted before they needed replacement. I change mine ever other oil change (6k miles)

Comments
Go Vols!!!

[blackbird]

Plug
Champion 570, RE14MCC4 (from new 5.7L Hemi V8 application). Gapped at .040".

Mods
Stock up to Stage 2 pushing 22 psi tapering down to 16-17 psi.

Stats
Consistent 12.90's at over 107 with just S2 w/toy on high-octane, FMIC, and WGA spring.

Mileage
Always replace before required to replace due to excessive wear.

Comments
Same heat range as stock 470 plug but with a different Champion "wide gap" designator that means the plug is designed to run smaller gaps. That's better when gapping down to .040 and under so the ground electrode doesn't have to be bent out of alignment at much. Slightly shorter on plug wire end but almost all wires will have no problem with them. Some of the Magnecor's designed for the older pre-'02 generation 2.4L heads fit tight as-is in the SRT-4 and may need a little extra care to make sure they go deep enough into the plug cavity to click onto the plug when running the 570's. The NGK 4306 is generally a better quality plug but in some cars, especially with Mopar Performance's Stage 2, they may develop a significant miss or "hiccup" when coming into boost under load and the Champion's appear to resolve this issue. (Note: it appears the '06+ PT turbo's have now spec'd the 570 as the OEM plug but still at the wider gap according to sparkplugs.com.)


Attached photo below, from Left to Right:
Stock Champion 470 (RE14MCC5), Champion 570 (RE14MCC4), NGK 4306 (LZTR5A-13)