I just installed the predator. I put in the Diablo tune and modified it a bit. I made it leaner by 2% in both ranges and advanced the timing by 5% in both ranges. I heard GT's run rich so I figured leaning it out a little would be a good thing and I know advancing the timing would be great as long as I run better fuel. I haven't heard any pinging so I figure I'm safe. I want to know if it's cool to do what I did and can I advance the timing some more or is there something else I should do?

 

The Diablo tune already leans out your A/F ratio as do your mods. I wouldn't run it any leaner without some dyno information.

 

So i'll stop leaning it out. Is it still ok to move the timing up?

 

Yes. Also I would set up shifting characteristics if it's an auto.

 

Playing with the A/F is bad if you are not on a dyno.

As far as timing goes, good fuel and listening for pinging is needed.

I DO NOT RECOMMEND playing with A/F unless you are on a dyno and don't know what pinging sounds like.