3sge (3rd gen) Octane? Options

[czwalga]

3rd gen 3sge does anyone know the recommended octane? Or most likely RON since it's not a US engine? I've been bashing my brains in trying to figure out this problem and refuse to go to another race with it. After about 30 hard miles 5k RPM.... the engine starts cutting out lower and lower in the RPM range until I cant rev over 4k RPMS.

I've been running 87 octane, i'm thinking the knock sensor could be detecting something and slowly pulling timing.




If this is the case i'm an idiot, and created a lot of headache for a stupid easy fix.... just sucks cause there's no easy way to test it.

This post has been edited by czwalga: Jan 31, 2013 - 8:10 AM

[delusionz]

this is EXACTLY what my car started doin...

I threw parts at it until it became right...

1. changed dirty fuel filter
result: more peppy, revs higher, but still cuts out

2. dropped gas tank, found a big square sheet of rubber in there that the fuel pump had sucked up, looked to be the floor of the intank swirl pot. removed and installed walbro pump
result: fixed the high rev cut out, but the lower revs became rubbish and stumbled everywhere, heavy fuel smell while driving (rich az fk)

3. changed rotor, cap and leads
result: alot more peppy in the midrange and up, a few low rev stumbles went away, but not completely.

4. changed spark plugs, they had become extremely fouled from the major change lean to rich
result: everything fixed, car became very powerful. 2 days later plugs fouled again.

5. powerfc ecu and tune
result: awesome, finally see whats wrong, now that i can datalog my engine sensors. looks like i had also fouled my o2 sensor as it reads a constant lean condition 0.2v, doesnt bother me since i no longer have o2 correction