Missing All Over The Place Wiith New Sparkplugs

[R33ram]

Hi guys,

Have a R33 gtst

the car is tuned on 18psi with power fc,Y.J coil packs,fmic,z32 and 040 fuel pump and bigger injectors and hiflowed turbo.

Bought a new set of sparkplugs as i thought maybe the ones in the car was making it cut out after 5500 to 6500 but it didnt help.

i dont no if it is the spark plugs as the new ones ran great for like a day and gave it a bit and nice through the rev range then when i full throttle it in first gear and it cuts out at 5500/6700 like brrrr brrr brr at the back of the exhaust and then when releasing the throttle it sounds like a wrx for 2/3 secs like on 5 cylinders and returns to normal again cruising..could it be coil packs.

the old ones i had are bosch platinum plugs heat range 6 and gap 1.1. so replaced them with NGK copper bcpr7es .8.

now the car runs like crap all over the place missing like u can hear on idle boof ,boof every 3,4 secs or sometimes a minute.

When driving it just under 3000rpm just misses and hesitates a little too.

I took the plugs out/NGK and see that the side electrode is white on all of them which means lean.

My bosh ones where pretty ok like a light brown,greyish colour on the side electrode.

could it be the NGK plugs are to cold at a 7 heat range as my bosh platnum ones are a 6 heat range.

i just changed them as i thought the gap would help it from cutting out but maybe one of the coil packs or now there just stuffing up more worse and this miss and that is happening.

any ideas before i break it lol

[DVS JEZ]

Try another set of coilpacks as a test

[blind_elk]

I'd suggest put the original heat range 6s back in, close the gap (.8 - .9).

[R33ram]

put the old plugs in bosh ones 1.1 heat range 6,s and miss and hesitation all gone besides the cutting out up top after 6000rpm..could be the gap now the problem for that or coil packs.

doesnt seem to like NGK for some strange reason.

[blind_elk]

doesnt seem to like NGK for some strange reason.

No, more likely doesn't like the 7 heat range. And the miss over 6k will more likely be the gap.

You can close the gap down on your Bosch plugs to eliminate the miss.

[R33ram]

Gonna try the gap next see if it helps..