Ngk iridium, pre-gapped?, edit: pop/bang on boost, help?

[Asad]

If theres nothing wrong with it leave em be

[AdamB]

If it blows out the spark you will develop a missfire under load.

I'm not sure what the gap spec is when you buy a set new but its always best to measure. I think they are 1.1mm.

You will also get better fuel economy with a larger gap, not that you will likely notice a difference lol.

[steve-gers]

I'm sure I read somewhere that you should use the biggest gap possible before the spark blows out as it gives you better fuel consumption (not sure if that is true or not). I think there gapped at 1.1mm standard and I'm sure the gap for 1Bar of boost is 0.8-0.9mm but don't quote me on that.

[A L 3 X]

The gap on mine is about 0.8mm maybe slightly less? they're ngk iridiums from iddy?

So would I be best to ensure they're at about 0.9 or leave them?

[AdamB]

I would adjust it until it suits your engine mate. No harm in being a smaller gap, but its better to run a larger gap.

The gap is not directly related to the boost pressure you run. Its more related to how efficient your ignition system is overall. Remember that you want the least resistance possible. Hence its still possible to run a 1.1mm gap even if you are running 2 bar boost pressure, yet run coil on plug ignition system.

Edited November 6, 2012 by AdamB

[A L 3 X]

Ah I see mate, the thing is as its working I don't wanna mess with it and risk

Causing a problem as I'm a bit unsure how to tell what suits the engine lol?

[Asad]

"Ah I see mate, the thing is as its working I don't wanna mess with it and risk Causing a problem"

[steve-gers]

If they work out the box at 0.8mm I would personally just leave them.

[A L 3 X]

"Ah I see mate, the thing is as its working I don't wanna mess with it and risk Causing a problem"

Eh lol?

N yeah Steve that's my thinking, that's just as long as they don't cause any harm like that

[Amjad]

Asad is saying if it's don't broke don't fix it!

[A L 3 X]

Oh

[A L 3 X]

Ive noticed that when i proper boot the car at full boost WOT sometimes the car lets out a hellish pop/backfire(I assume a flame...) now I'm not sure if its due to it running richer as ive just fitted a JAM ecu and turned it up to 1 bar, or if its actually an issue?

The car dont seem to lose power but im not sure as since turning the boost up it usually just spins through second lol

Any ideas if this pop is normal for a richer setup?

[steve-gers]

during acceleration or when you let off to change gear?

[A L 3 X]

I think it was just before i let off but might have been easing off?

[steve-gers]

sounds normal

[A L 3 X]

Ah right, n if i was accelerating? I really dunno because it happened so quick, the gf shit herself lmao and i kinda backed off then as i didnt know if something was up?

[steve-gers]

Under acceleration I would tend to say it's more of a misfire whereas if you let off then it can still fuel a bit and spit a flame, especially on the overrun.

[A L 3 X]

Hmm I dunno then, i'd hope its not a misfire as i've just had a new rotor arm, dizzy cap, the aforementioned plugs and blue magencores, what else would cause it? :/

[steve-gers]

nah it will be a flame. If it was a misfire you would feel the loss in power mate.

[A L 3 X]

yeah I dind't seem to feel any lag like i used to with fuel cut, but like i say it was unexpected to say the least lol, quite cool though if its all normal lol

[micky boy]

When i was running the JAM ecu it used to shot the odd flame out thats normal mate lol

And if your car is runnig normal and you are happy with it then dont mess about with it keep the plug gap as they are as long as the gaps are all the same leave them

Also not sure if its the same for you but every JAM ecu i have had on my car it will idle at 950rpm then if i left it tick over for a few mins it would idle to 1000rpm!

At first i thought i had a sensor problem (ICV) etc but it was only when i put the stock ECU back in it never done it! But soon as i put the JAM ecu back iin was doing the same thing!

And its done it on 2 different JAM ecus so im gessing its just the map on them

Edited November 6, 2012 by micky boy

[A L 3 X]

Ah right, even when accellerating sometimes? Or just sbout to let off high revs?

You've reassured me if so lol

And i'll be honest mate, not 100% sure, what i did notice though is when i fitted the jam mine idles at like 500 rpm had to turn it up with the idle screw, my standard ecu used to idle up randomly but cant remember if that stopped when i took the AC out?

[Amjad]

I want flames

The exhaust does let out some epic bangs though (Mine's ECU)

It generally happens when you let off and possibly between gear changes

[A L 3 X]

Hmm yeah that's the weird thing I can't quite remember but mine seemed to be just before I let off, which I dunno if its bad?

Like I say sounded mental tho haha

[A L 3 X]

I've asked a mate of mine to speak to a mechanic and apparently he's said if its doing it on acceleration it must be overboosting and its gonna melt a piston, now I can't see this being right as obviously ive just fitted a jam ecu and its boosting like 0.9999 bar on the gauge, another lad has said it must be overboosting and sparking out....but again I can't see that as I've just fitted new dizzy cap, rotor arm, ngk iridiums and magnecores? Unless I need to change the plug gap?

Someone help, scared to drive the car