Car Mis-firing Problem?

[CAT_SPEW]

I'm having some problems when I go past around 4-4500Rpm after driving for a little while..

The car mis-fires and sputters ie. looses power.

I'm running 12.5psi making around 250rwkw on standared injectors, bigger fuel pump. exhaust,fmic,haltech e6k etc.

I searched and found that the problem might be the gap on my plugs is too big, so I gapped them down to .8. Worked when I went for a test drive, but still breaking down when I was out today...

Another thing, it has a custom intake plenum which has some small gaps around the gasket from not being tight enough on one side. And around number 6 injector doesn't have a tight seal and is sucking in some air..

could this be my problem?>

Any other ideas???

[r33_racer]

prob a combination of those things...but im fairly confident stock inj max out around 240 rwkw dont they? Maybe its that.

[CAT_SPEW]

Yeh could be that, it only seems to happen in the heat??

I'm waiting on a set of 740cc's to come then see what happens, any more ideason what it might be?

[Links]

Not the coils? is it missing for a second than coming back on boost/power?

[CAT_SPEW]

Could possibly be coil packs, but when it miss-fires it continuees doing it until I change gears..

[Beer Baron]

i want to know how it makes 250rw kw??? what type of turbo are you using? what cams?

[CAT_SPEW]

i want to know how it makes 250rw kw??? what type of turbo are you using? what cams?

<{POST_SNAPBACK}>

Hybrid turbo, dyno was done last year so I think it would be putting out a bit less by now. stock cams

[tufsix]

If the car been running good on the injectors for a while i couldnt see it being that unless they are dirty....i would say it will be coil packs. If u have a mate who can help u out try there coil packs.

[CAT_SPEW]

If the car been running good on the injectors for a while i couldnt see it being that unless they are dirty....i would say it will be coil packs. If u have a mate who can help u out try there coil packs.

<{POST_SNAPBACK}>

I don't want to sound stupid, but it has two "igntion" packs or something screwed onto the rocker cover. I'm guessing they are supposed to strengthen the spark or soemthing?

Or am I way off?

I don't know anyone with a set of coilpacks that I can try, what does a new upgraded set cost roughly??

[tufsix]

The box is a igniter box but Series 2 R33 dont have the box as they have built in igniters.There is a group buy going for splitfire coil packs$640 delivered from Kudos motorsport they are usually $999rrp.

tufsix

Edited August 24, 2005 by tufsix

[CAT_SPEW]

It is not a standared thing, he has screwed two of them into it?

$640 is alot to spend on something I'm still not sure will fix the problem??

I'm probably going to get a set of high quality Iridium plugs first and see how that goes, what gap should I be getting?

[race_snooze]

.8 mm

Edited August 24, 2005 by race_snooze

[CAT_SPEW]

Thnx, I'll try them and see how I go..

[predator]

I doubt any fancier type of plugs will fix the problem..

A member here at massive trouble he swore was his coil packs..turned out to be split wiring on the pack loom, causing spark to earth under load.

One way to check that is to remove the spark plug cover.. put it back together, wait until its dark.. give it some revs and try and spot any obviously arcs, or if you can see any jumps in the packs.

[CAT_SPEW]

Yeh that sounds like it might be the source, I will give it a try tommorow aswell. I'm due for some new plugs anyway so might aswell.

[tuff33]

ive had problems 2 spark plugs on the skyline r 0.7mm not 0.8 and my coil packs were shorting out to my engine. got silicone and put around the coil packs and they were fine no more missing .