R33 Gtst Boost Problem While Driving

[r33gtst-kal]

gday guys, having problems with my r33 gtst, while driving under boost if i have 1/2 or more throttle once it hits boost it just breaks down, backfires, sneezes through the pod. changed coil packs 8 months ago because of a previous problem everything has been sweet since then, this is a new problem to me :S changed coil packs (8 months ago) fuel filter (today). when i am outside the car and i rev it right up its fine, not until its loaded up while driving that it breaks down, if anyone has had similar problems/got any ideas that could help me out it would be much appreciated.! also, it sometimes blows the vaccuum line off to my intake plenumn, which makes it idle a bit rougher if that contrbutes in any way..

any help would be MUCH APPRECIATED.

cheeers.

[Mid_Nite_R33]

first thing, what boost is it running?

[r33gtst-kal]

first thing, what boost is it running?

its running 9-10 psi, has GFB manual boost tap.

[Mr 33 gtst]

From my understanding, if you run any higher than the factory boost it would make sense to change the spark plug gap.

mine had the same problem when i bought it and started modifying it.

[r33gtst-kal]

From my understanding, if you run any higher than the factory boost it would make sense to change the spark plug gap.

mine had the same problem when i bought it and started modifying it.

yeah, i changed the spark plugs when i got new coil packs, the thing is that it's just come from no-where, it was running mint, then all of a sudden it was no good. and sice i did the plugs and coil packs, 8 months ago, its ben running sweet up until now?

[joeyjoejoejuniorshabadoo]

Did you get splitfires or second hand coils?

[r33gtst-kal]

Did you get splitfires or second hand coils?

yeah, got splitfires, brand newy's its a different sound and feeling to when my coil packs were stuffed, it really jolts the car around when it does it, :S