Misfiring After 5000rpm

[nemz]

Hey guys, my friends r32 is misfiring badly after 5000 rpm, it has iridium sparkplugs which are 6 months old so i diddnt think it was that, we put a fuel treatment in it 2 weeks ago the max octane boost one, he gave it up to 5000 rpm let it sit there and then gave it up to 6800 rpm and it was ok, but it had to be staggered or it would misfire, now after fuel treatment it still misfires. it has a 3' exhaust pod remapped ecu and hiflowed the stock turbo, BEFORE , the car would run fine on 15 psi,but now its misfiring on 10 psi (were leaving it on 10 psi). any ideas?

[tufsix]

My first guess would be coil packs.

[WazR32GTSt]

my balls are on spark plug gap too large

try 0.8mm

[QuickR33Melb]

A problem that had me scratching my head a couple of years ago

It will be one of these:

1. Coil packs in the Rb20 are prone to f*ck up.

2. Most likely your spark plugs are not gapped correctly and adding octane booster puts this orange shit on them that stops them working correctly and this problem is simply amplified when the gapping is wrong.

[nemz]

ok sweet, its going in for diagnostic next week, ill recommend checking coilpacks and adjusting the sparkplug gapping, so all in all it dosent sound too serious?

[tufsix]

i think the iridium sparkplugs come with a gap of 0.8mm already mine did.

[WazR32GTSt]

that's a generalisation...

from what i have seen, spark plugs are generally either gapped at 0.8mm or 1.1mm in their "factory" form

eg NGK coppers: BCPR6ES-11 or BCPR6ES - both the same plug, both brand new, and as you might guess one is 1.1mm gap and one is 0.8mm gap

so they might be gapped to 0.8mm or they might be 1.1mm. with the symptoms he has described i still have my balls on 1.1mm gap as the source of the problem. If hte gaps are already 0.8mm then i take my balls off the plugs and putthem on coils as the problem

either way, its not too serious

of course it could be something different altogether - i can only suggest what i think based on my personal experiences... i'm not a mechanic

cheers,

Warren

[bbe]

all of the above mentioned..plus

fuel pump ( happened to me ) sounds weird i know

too much oil deposits in cooler plumbing (happened to me) f*ks mixtures and puts out spark when drawn up

ShiBBIe

[Cubes]

Fouled plugs?

[MYSTR33]

do a search mate..

"misfire"

being covered more than enuff timesss...