2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

Spark plug gap for 2.8"

Old 11-06-2009, 11:09 AM
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Spark plug gap for 2.8"

Like the title says, I'm running NGK 1 step colder plugs(heat range 6). What gap should I change them too? They are iridium, so I know I have to be careful when gapping them.

Mods:
2.8" pulley
60lb injectors
dual pass
frozenboost dual core h/e
knn intake
pacesetter header
modified lsj dp
Megan catback(oval muffler w/magnaflow tip)
ttr poly tranny bushings
ttr poly engine mount

working with vince on my tune, here's what he said:
"There are two things happening here.
*
1)****** It’s still too rich
2)****** The knock sensors are picking up noise the ECM thinks is spark knock and its sending the timing into the basement
*
#2 could be because of #1 though (if it is real knock).*"

I have double checked every wire, gasket and bolt. Mechanical it's all good to go. Just Need to figure this spark knock.
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Old 11-06-2009, 11:31 AM
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use copper plugs they work better but they need to be changed every oil change
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Old 11-06-2009, 12:53 PM
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We don't have a copper option, im a 2.2, I have looked and I can't find Cooper plugs.
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Old 11-06-2009, 01:06 PM
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2.8" pullies should be 0.035" I believe...
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Old 11-06-2009, 01:08 PM
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Originally Posted by Jn2 View Post
We don't have a copper option, im a 2.2, I have looked and I can't find Cooper plugs.
aren't the spark plugs interchangeable between models?
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Old 11-06-2009, 01:11 PM
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2.8 on a 2.2 thats a risky one.
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Old 11-06-2009, 02:02 PM
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Originally Posted by Illini_06SS View Post
2.8" pullies should be 0.035" I believe...
K I'll try that. Thanks
Originally Posted by D4u2s0t View Post
aren't the spark plugs interchangeable between models?
sorta kinda. Same threading, but the threaded part is longer on mine than the lsj. What's the p# for 2 step colder copper plugs?
Originally Posted by ecotecturbo View Post
2.8 on a 2.2 thats a risky one.
yeah, but no risk no reward
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Old 11-06-2009, 02:06 PM
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Are you running LFR6A-11 like alot of other boosted 2.2/2.4's? If so, those are copper plugs. Also, mine lasted 20k before i replaced as preventative maintenance.

edit: yea i can't read apparently as you said iridium in first post! Maybe switch to the coppers I mentioned then, which are also 6 heat range.
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Old 11-06-2009, 02:20 PM
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Originally Posted by mtbrent View Post
Are you running LFR6A-11 like alot of other boosted 2.2/2.4's? If so, those are copper plugs. Also, mine lasted 20k before i replaced as preventative maintenance.

edit: yea i can't read apparently as you said iridium in first post! Maybe switch to the coppers I mentioned then, which are also 6 heat range.
I'm running:
- LTR6IX-11

they r iridium. Ima swing by vatozone and pick up some copper ones when I get off work. Also got a new tune I got to try
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Old 11-06-2009, 03:03 PM
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the 2.2 in my hhr is deeper
the threads is hella long.
i still dont see no evidence
of changing the coppers every
oil change.
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Old 11-06-2009, 06:47 PM
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Mine are .032
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Old 11-06-2009, 07:46 PM
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Mine are 0.032 as well
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Old 11-07-2009, 09:02 AM
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i also run .032, BRK7E Cu

JN2 how much timing are you runnng? Commanded vs. actual?
Do you have aggressive mounts that cause severe vibes? This can be picked up as knock
what is your A/F ratio say? 60s are pretty bad at getting choppy at idle.
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Old 11-07-2009, 11:21 AM
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Originally Posted by JapEatr View Post
i also run .032, BRK7E Cu

JN2 how much timing are you runnng? Commanded vs. actual?
Do you have aggressive mounts that cause severe vibes? This can be picked up as knock
what is your A/F ratio say? 60s are pretty bad at getting choppy at idle.
I've seen this first hand caused by poly mounts. Picked it up on an interceptor and verified with HPT.
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Old 11-07-2009, 01:15 PM
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Originally Posted by JapEatr View Post
i also run .032, BRK7E Cu

JN2 how much timing are you runnng? Commanded vs. actual?
Do you have aggressive mounts that cause severe vibes? This can be picked up as knock
what is your A/F ratio say? 60s are pretty bad at getting choppy at idle.
Yes I do have all solid mounts. So that could be part of it. I recapped my spark plugs to .037...they were at .050 O_o factory falling from ngk...I couldn't find any heat range 7's yesterday. Not in my size, guess I have to order them. Also we did moretuning and my car is running a lot better. Getting 15psi on my 2.8...

16* of timing. Should I run more? I have no way to know iat2's either btw.

Last edited by Jn2; 11-07-2009 at 01:15 PM. Reason: Automerged Doublepost
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Old 11-07-2009, 01:17 PM
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yup mine are .032 also work well
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Old 09-16-2018, 01:58 AM
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I was having issues with any gap > .035 and boost blowout hesitation, 0.032 feels perfect for a 2.8" pulley. I'll stay at this gap from here out.
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