What Are The Pops? When Gunning It

[made_guy]

having just installed a jj front mount and upping boost to 10psi i've noticed that when flooring it i don't get great response and up around the 4500-5500 rev range i get a series of little pops.

I used to get some louder pops when changing gears ever since i put my exhaust on, but these are much quieter and there's more of them. still get regular backfires when changing gears with a bit of throttle and i think they're a bit louder too.

mods are simple:

fmic

ces split dump+front

nismo cat-back

...gutted cat (i only did it to see what it was like til i get a catco i swear!!)

ebay manual boost controller running 10psi

apexi pod - no cold air box yet

just completed my 100k service too and i'm pretty sure the timing is all good cos it runs beautifully smooth other than this issue.

fuel filter is only 2000km old also, but i haven't checked/changed the plugs yet nor have i inspected the coil packs.

so i actually just want to know what the pops are - i'm guessing misfiring? what does 'pinging' sound like?

I'm guessing the remedy could be anything from plus->coilpacks->fuel pressure->management right?

I haven't changed

[barnoon]

Sounds a lot like a missfire could be due to coilpacks breaking down or spark plugs needing a change or gapping down as the extra boost blows the spark out, common as hell in Skylines.

[paulr33]

its the stock ecu doing its self protection as youve changed the cars airflow

get a piggyback or stand alone ecu or even a remap and take out the factory r&r protection

[made_guy]

hmmm so two choices....oh well. i suppose i need to do both (plugs and coilpacks and get some management - thinking emanage ultimate at this stage) so i guess i just need to choose one to start with! $$$$ hey isn't there a thread about making the standard coilpacks tougher? might try that or get the jjr ones!

thanks guys

[barnoon]

Ah yeah I forgot R33s had R&R from the stock ECU, but if it does turn out to be coilpacks I had the same problem on my R32 and instead of spending $600 on SplitFires I bought a $11 industrial grade hi temp proof silicone from Bunnings and covered them up in it and havent had one missfire since and I run 18psi

[made_guy]

Ah yeah I forgot R33s had R&R from the stock ECU, but if it does turn out to be coilpacks I had the same problem on my R32 and instead of spending $600 on SplitFires I bought a $11 industrial grade hi temp proof silicone from Bunnings and covered them up in it and havent had one missfire since and I run 18psi

sweet - what part of the coilpack exactly do you cover up? photos anyone??

[madaz R33]

I hads the same identical issue, soon as i upgraded my exhaust/fmic i noticed the "popping" increased in ferocity, checked s/plugs, siliconed the coil packs up, slight difference , but it wasnt until i got my pwr fc that it became evident that it was my standard ecu going into R&R mode, get an engine management system in my opinion, the rebroad minded persons will speak for themselves

Edited September 24, 2007 by madaz R33

[r33cruiser]

i have that slight popping/backfire between gears and stuff, and i must say i like it.

a few of my mates always say that everytime it pops/backfires, it always spits a flame.

they love it

[madaz R33]

i have that slight popping/backfire between gears and stuff, and i must say i like it.

a few of my mates always say that everytime it pops/backfires, it always spits a flame.

they love it

That "Popping" is actually misfire, it is not good dude, no matter what it looks like

[Munkyb0y]

theres a high chance it's not r&r. its probably the stock ecu running the mixtures way too rich. or the coil/spark issue that is very common.

ppl seem to brand everything r&r around here, but on 10psi, i dont think so

here's a pic of my coils, they're drying right now. i started getting a miss at 12 psi

as you can see i covered the whole underside, just to cover my ass. i also cleaned the contact area, thats bright gold now. it was a very dull grey before.

make sure you only use selleys 401 silicone.

check this thread. http://www.skylinesaustralia.com/forums/in...amp;hl=coilpack

Edited September 24, 2007 by Munkyb0y

[The Mafia]

i have that slight popping/backfire between gears and stuff, and i must say i like it.

a few of my mates always say that everytime it pops/backfires, it always spits a flame.

they love it

lol some of the crap you come out with cracks me up

You like all the shit that wrecks your car....

[Atreyu]

When I had my 33 It had a gutted cat and it used to shoot flames! Ha ha, the only reason I gutted it was the fact the inside fell apart, was a 3 inch nismo cat, only had two sections of substrate in it, both around 4in thick, one had broken away, rattled like a b*tch.

Back to the question on hand. Get some Selleys 401 Hi Temp Sealant/adhesive to seal up coil packs or spend $600 and get some splitfires.

[R34GTFOUR]

theres a high chance it's not r&r. its probably the stock ecu running the mixtures way too rich. or the coil/spark issue that is very common.

ppl seem to brand everything r&r around here, but on 10psi, i dont think so

here's a pic of my coils, they're drying right now. i started getting a miss at 12 psi

as you can see i covered the whole underside, just to cover my ass. i also cleaned the contact area, thats bright gold now. it was a very dull grey before.

make sure you only use selleys 401 silicone.

check this thread. http://www.skylinesaustralia.com/forums/in...amp;hl=coilpack

Thats what i used to think with my bros gtst. I couldnt believe it was the ecu, so we re-gapped the spark plug, put brand new splitfire coils in and still it was there. And it would do it even if it wasnt on full boost, as in if it was coming on to boost and you hold it at 3-4psi through out the rev range it would still splutter, miss and surge depending on how it would feel and other times it would be fine. Then he just bit the bullet and got a power fc and straight away the extra CLEAN power you get, bloody amazing, no hesitation no nothing it just pulled right through to limiter. And he only had an exhaust and fmic.

While there could be just a plug gap or coil problem with the above, i would bet that the ecu is playing a big part, they just dont like anything but a completely stock engine.

[Aif]

i had to get my plugs re-gapped for my FMIC coz i had the same problem, and if ur coilpacks are shagged then silicon, stickie tape,baby oil or any of the other "remedies" for it will probably not last. the guys at mercury motor sports said that if u wonna boost your car then upgrade your coils and get the right gapped plugs so the spark doesn't blow out.

AiF

P.S the is a MacGyver thread to try and fix up ur coilpacks - http://www.skylinesaustralia.com/forums/in...l=fix+coilpacks

[made_guy]

theres a high chance it's not r&r. its probably the stock ecu running the mixtures way too rich. or the coil/spark issue that is very common.

ppl seem to brand everything r&r around here, but on 10psi, i dont think so

here's a pic of my coils, they're drying right now. i started getting a miss at 12 psi

as you can see i covered the whole underside, just to cover my ass. i also cleaned the contact area, thats bright gold now. it was a very dull grey before.

make sure you only use selleys 401 silicone.

check this thread. http://www.skylinesaustralia.com/forums/in...amp;hl=coilpack

hey thanks for that! the pic is perfect!

i'll definitely give this a go and probably replace the plugs first - then if the problem persists, the money i've saved not buying new coilpacks can go towards an emanage or something.

cheers!!

[Munkyb0y]

what are your plug gaps right now? dont forget, if you wanna boost, even to 10psi, you need 0.8mm gaps. standard spec is 1.1mm

it may well be ecu, but this is a cheap way to eliminate at least the coils as the issue.

[TTT]

pinging sounds like this.

glass coffee jar.

regular glass marble that you used to play with as kids

put it in the jar.

put the lid on the jar.

shake the jar around..

that's the sound of audible pinging.

which means that it has been pinging for a long time before that which means you've already done alot of damage.

[Yidz]

Hey buddy this happened to me a few weeks ago after upping the boost. Big chance this is the problem. All I did was turn mine back down and its all good. Don't even think about buying anything to fix these other possible problems. Turn your boost down first and go from there.

[gotRICE?]

Im totally new to the Skyline/Turbo scene, but by the sounds of it, basically leaving the boost at stock levels untill you get Engine Management sounds like the way to go, even if you have FMIC, full exhaust, Intake etc..? (figured starting another thread was pointless, so ill jack this a tad.. )

Is it neccissary to re-gap the plugs to 0.8 when you just have intake and exhaust ( split dump/front, de-cat and catback)? Just wanna make sure im doing everything right :sorcerer:

EDIT: Ignore me. Like 10 topics down was a 10 page thread that was hellova helpfull. Very interesting too!

= n00b.

Edited September 25, 2007 by gotRICE?

[Black_CSR]

I have the same problems as well.. but only happens during the night or when it's cold n give that extra PSI...

Sometimes it doesn't even miss but when it does it's shocking

Changed my Plug to Iridiums n got them gapped to 0.65 was Ok then when i drove it @ night when cold it missed Bad. Changed the Fuel filter also recently didn't really help and now in the process of getting a new Oxygen sensor.

I can get some Splitfires on my nextpay or just get my PowerFC in and get it tuned...

What do u guys reckon??? i don't really wanna get it tuned n find out my Coilpacks r stuffed or just get it tuned anyway to c if it will fix it

Car is Series 2 R33, FMIC, 3" Turbo Back, Pod, 10-11psi stock turbo.

TA