new commodore

[macca_779]

do u think I have problem with AFR, the engine doesn't accept (+) timing. If I shoot for 12.2 ~ 12.5 the car knocks a lot with stock timing.

Are you using knock muffs to confirm if its actually knocking. I wouldn't take what the engine knock sensors are giving you as gospel. I've heard they are over sensitive.

[odd boy]

no I rely on the engine's sensors, I don't use muffs

[macca_779]

no I rely on the engine's sensors, I don't use muffs

My advice is to invest in a set. That way you will know for sure. Hell that's how it was done on old carby fed cars with dizzy's and vac advance.

[odd boy]

I did a lot to the car yesterday, for testing I've disabled both knock sensors. I’ll do some tests on dyno tonight and give u the result. I will list down all modification I did when I get (+) results.

[ls1vt209]

What fuel has the car been tuned for?

[odd boy]

93 octane

[odd boy]

It took some effort, the game was "knock sensors". They are over sensitive as macca said earlier. I had to cheat the ecu to make the car flying as a falcon by blind them. Thanks for your help.

[joecar]

Good job...

[shane]

Try using the 8 cylinder knock pids. youll find that theres generally only one or two cylinders doing all the knocking .dull them down till they all read the same when actually knocking add a few degrees and make it rattle at low engine speed (easy to do in a lugged higher gear.)Dissabling all the knock sensors is not the best way to do it.
Thats my two cents,
Cheers Shane