Apexi' NEO tuning/general tuning advice

[mattmk3]

Originally Posted by cre

17+ AFR is leaner than you want at idle. It may creep there on occasion on a sound setup but shouldn't spend most of its time there.

Removing EGR on vehicles made after the 70's is just ignorant or motivated by vanity. It doesn't effect performance at all while at WOT (as it's off then) and it helps cool the engine after a hard run. As for the latter... MOST people couldn't give a shit what it LOOKS like under the hood. It kills me how people try every single trick they can to increase performance and at the same time nickle and dime themselves out of power based on the opinions of some guy with a mullet, '65 Mustang and 12 pack of Budweiser in his gut. Don't worry though, it's not going to kill your engine with it removed.

Are you having any issues with AFM related error codes? Are your AFR trends significantly different after cold starts vs warm? What do you mean by "preloading"? Brake boosting? The smoke is probably either running rich or oil... hard to say without seeing it myself.

No codes or anything. This is what I mean by what the hell is my cars deal with me doing this mod. How do I go about richening up idle? it's still 17 at idle and 15-16 cruise, really light cruising 17.

Not quite brake boosting but putting a nice load on the engine then hammering on it. Just building up the boost as apposed to just waiting for the turbo, it builds more boost, quicker, so it seems that's when the most stress is on things. New note on this, I get this strange, very fast sounding, not quite a rattle, more of a grind, but not quite a grind. haha impossible to explain so I have my gopro with a remote mic and i'm going to place it in a couple spots in the engine bay and see what that noise is. It seems it happens over 17psi boost; so when i put some load then hammer on it, it spikes for a second but keeps up there and I hear it. It's only happened a couple times but if i were to take a stab at what the noise may be, I picture the compressor wheel of the turbo grinding into the housing... But the turbo is recently rebuilt and upgraded...

Cold and hot afr's actually aren't too different. Been driving it since I posted this thread, so a couple days now. Still pulls hard, feels great throughout the powerband, my turbo spools quicker a lower rpm. I just DON'T like the lean idle. I did some research, 16afr cruise isn't even bad so I'm only worried about idle at this moment.