Spark Plug Gap?
 

What are people running for a gap on their spark plugs?
NGK R plugs, magnacore 8.5 wires, E85 and 26psi

OEM says 32, my car would studder and missfire
Was tuned on 25 gap, it had a few misfires at first then LOTS
brought it down to 20 (my lowest gap) and had random misfires...

Re: Spark Plug Gap?
 

If your still getting misfires at .020 then id check your wires, they could be arcing out.

Re: Spark Plug Gap?
 

he has low compression in a cylinder...

Re: Spark Plug Gap?
 

Wait is it misfiring under boost or all the time?

Re: Spark Plug Gap?
 

Randomly, but only under boost.

Re: Spark Plug Gap?
 

Id check for bad wires.

Re: Spark Plug Gap?
 

Yeah .020" is a very small gap. Most I would ever go down to is .024".

Re: Spark Plug Gap?
 

should i bring it back up from 20 to 24? ill check all the wires over tomorrow.

Re: Spark Plug Gap?
 

I would. Ideally you want to make the gap as big as possible without blowing out the spark. I would be testing other things to figure out why your misfiring. Time to swap out ignition parts.

Re: Spark Plug Gap?
 

where would you start?

Re: Spark Plug Gap?
 

NGK's at .028" is where I have mine at. 60-1 @ 25psi, E85. No issues at all.

Re: Spark Plug Gap?
 

new spark plug wires and maybe try a different set of coils. My 2G would do this horribly on an 'ok' looking set of magnicores. I bought a set of the Taylor 10mm wires and the thing ran like a dream! Get a set, and set to about .024, that's about as low as you should go on pump gas car.

Re: Spark Plug Gap?
 

Instead of getting new wires and hoping nothing is wrong with my coilpacks could i just go with a COP system?

Re: Spark Plug Gap?
 

At 32psi on E85, I had to have mine set to around .019 to avoid miss-firing. .018 is the lowest I've heard of anyone running, and is the lowest I'd ever go because that is getting really small.

I decided to get an Arc-2 unit so that I could open my gap back up, but I'm still having the same issue even after the Arc-2 install. My wires are Taylor 10mm's, I've tried BRP6's and BPR7's, I've got a 'different' (wouldn't call them new) set of coils. I'm still having to run around the same gap to avoid miss-firing at 32psi. At 25psi, I'm usually OK around a .024 gap, but I find myself having to change out plugs every few weeks which sucks.

I may get rid of my taylor wires and try something else, just not sure which yet. I might just go back to OEM NGK wires.

Re: Spark Plug Gap?
 

If you do make sure to get a really good one, like a sparktec. 99% of the COP kits out there use chrysler 300m coils or other random shit that is more often than not inferior to the stock coils.

Re: Spark Plug Gap?
 

For the money, I would skip the COP and just get a good working stock system first. If the COP messes up, how will you know? New wires are cheap and a used set of coils can be had for cheap as well. Try them first.

Re: Spark Plug Gap?
 

Um, what kinda coils does sparktek use? I emailed them about it and they never told me what kind of coils they use.

Re: Spark Plug Gap?
 

I run mine around .026-.028 and it works fine for me. A lean mixture can add to the problem also.

Re: Spark Plug Gap?
 

Yea good luck with that. Maybe call AMS next and ask what wheels they use on the 850R turbo ;)

Re: Spark Plug Gap?
 

Yeah its probably because they use the 300m coils as well which deglorifies there whole company.

Re: Spark Plug Gap?
 

My Buschur COP uses the 300 coils and they work. Why the hate?

Re: Spark Plug Gap?
 

The bad thing about getting new wires is that i relocated the coil pack when i put my JMF SMIM and ONE wire is too short so i had to call mangacore and order just one of the longest wires. If i bought a set id have to do something stupid like that again or buy TWO sets and that would BLOW

Re: Spark Plug Gap?
 

you could get a set with custom sizes, or you could just order from a different car that has the sizes you like.

but i think your overthinkning this issue. check your coil pack for arcing and multimeter it, then check your wires, and see if they are arcing on the spark plug cover where you drilled through it, they may be rubbing. You arnt still using those iridiums that you had at my house are you? and for good times sake, do a boost leak test!

Re: Spark Plug Gap?
 

NONO i got new plugs at DBs the day of my tune. I'm gonna throughly investigate tonight. Call me Maxon PI! Boost leak test is in the works for tom if things don't pan out tonight. Eagle Talon Guy has a tester so hopefully i can take him away from his NEON for long enough to do it.

Re: Spark Plug Gap?
 

Replaced a few things i had been meaning to get at tonight. Throughly inspected plugs, gapped them to 23/24, and wires. Coil pack turned out Good to go. Replaced a fuel line that was in need of some attention. Replaced an UICP coupler and a Tbolt clamp and i replaced the hose from my BOV into my intake.

Solid, strong pulls with no misfires :)

Thanks for the advice! See you all saturday! Don't let Spilner put down bigger numbers than you!

Re: Spark Plug Gap?
 

Change your spark plugs every other oil change ($7 is worth it). That was my policy, and it worked wonders. 0.22 ftw, never misfired on e85 and high boost.