ashb82

i am tuning my car and it is poping at high rpms 5500 up. its a f22 so that is high rpms.
my vtec comes in a 3500 so its not that. I have tuned cars for awhile now never had this issue
I have 880cc injectors wideband 255 fuel pump 60-1 turbo
what things could cause this in a tune i know its not detonation i can hear it or see it on the plugs and it makes power just pops from 5500 to 7000 rpms.
could to not enough timing cause this or incorrect spark plug gap.
here is one of my spark plugs and my afr is at 12.5 afr when this happens.

tofast4uh22

that plug is showing you being at little leaner then 12.5 if i was you i would tune it to more on the lines of 11.7-11.9

ashb82

yeah i am shooting for that but it scares me when did it so i stopped driving it to ask some questions.
i hoping it is the gap i just checked them they are gapped at like .040 does any body know if low timing can cause this i was looking at my map and it has like 9* of timing at 9psi that seems very low to me for 9:1 compression

EARLdaSQUIRREL

its probably a combination of running lean and to big a gap

gap them to 23 and get the a/f in the 11's

LowBudgetBEe

9 degrees of timing is not enough for 9 psi. somewhere around 18-20 degrees is enough

ashb82

do you think 12.5 is lean enough to missfire. i am working to get it to 11.5. i dont know if any of you have tuned a f22b1 but this thing is a tq monster it in a f2b civic.

EARLdaSQUIRREL

if you have a big gap in your plug and running it lean then of course

RBrandonS

timing is way off. step it up to about 18 degrees or so and add more from there if needed. Also gap the plugs to about 28 and go from there.

ashb82

i keep reading about colder plugs i did that also. I understand what a colder plug is but how do you tell if your plugs are correct heat range

SOHC_MShue

You've tuned cars for a while, but are wondering why you are misfiring with a .040 plug gap? Gap it down and put it on the dyno to find the correct timing. It sounds too low.

ashb82

yeah just my stuff though. i thought i awhile back gapped them i guess i was wrong. i just over react when something goes wrong. i have learned to do stuff myself
no good tuners in my area. Plus the last great tuner that tuned my first boosted car i blew up on the way home. Thats when i learned to do stuff myself and correct. never blew my engines since then

418whpturboD

id gap it around 22-23 and get the afs around 11.5-11.8 and get that timing up to 17-19 area.. it will probably haul ***..

RBrandonS

ngk bkr7e plugs gapped at .028. shoot for a 11.5 af ratio and bring the timing up. car should wake right up.

Boosted_B_Series

Like everyone said, fix your timing. I'd do a simple step retard.

Then I'd start with a .032 gap, if that doesn't fix your misfire decrease in .002 increments.

The larger the gap you can run, the more power it will produce.

Keep your air fuels safe @ 11.5 or so. Pull accordingly and check for detonation specs.

turbociv910

what heat range is that?

gap to .25-.3 and try from there, 9 psi should not need a very tight gap.

tune 12.0 under boost- 12.5 is lean.

98vtec

make a pull and shut the engine down immediately when that happens. You want to, in a way, capture a picture of what is happening and by shutting the engine down while the engine is under load and looking at the plugs then they will tell you whats going on in there. Take a look at the ground strap and it will give you an idea about your ignition timing. You want the color change from the heat to be right at the apex of the bend in the ground strap. If the discoloration happens to close to the base of the spark plug, then you are running too much timing and it needs to be backed off. If it is closer to the electrode then you are running too little timing. If you are running a program like crome, or another honda based software which cannot turnoff the honda ignition ghost then what you see in the table is likely no where even close to what the actual timing going to the engine is.
You also need to determine whether or not you are running the right heat range. 2-3 threads of discoloration is about where you need to be. Its hard to tell from the picture you posted since it is too dirty to see the discoloration from the heat.

the popping should go away once you gap them appropriately.

blinx9900

gap is too big for sure, i had the same problem on a b, i closed the bap to .024 and it went away.

ExVtec

2nd that...

0.040 is on the large side.

Start @ 0.030 and move it down until it quits.

ashb82

I dont want you guys to think i am a idiot and dont know how to tune. the local autoparts store had spark plugs for by one get one free. so i bought all different heat ranges to see what effects colder plugs had. i must of missed gapping a set i bought 4 sets and 4 heat ranges. I am at work now hope to get home and see how the gap helps

SovXietday

What heat range is that? Hard to tell being as it's not a new plug but almost looks like the stripe on the grounding strap is a little on the hot side.

Tad lean, you don't want to the porcelain to be quite so white.

And like everyone else says, gap is definitely too big.

98vtec

well the portion of the porcelain you are looking at is just idle and light cruising. You wont see the acceleration portions or WOT portions without a nice light and a magnifying glass. Being white is fine for the areas shown. You dont want the porcelain to have a glazed/shiny look from being too hot of a plug or running too much ignition and the obvious no black specs.

SovXietday

I was under the impression that the porcelain should have a slight browning color to it when running gas at WOT when the mixture is correct.

98vtec

the WOT portion of the porcelain is hardly visible with a camera as it is where the base of the plug and the porcelain meet on the inside of the plug.

read this, it helped me a lot
http://bbmoto.net/wiki/index.php?ReadingSparkPlugs

SovXietday

Good link, thanks a lot. I have done some research on plug reading and I've never heard of the porcelain 1/3s till today.

ahobbs

i bet that solves the problem along with timing