I have to somewhat disagree with the statement about running lean causing cam surge. It has been my experience that leaning out my idle and off idle(up to 1200 rpm) has greatly improved the driveability of my car. In the past I dealt with extreme idle split BLMs which consequently created 1 rich bank and what was believed to be 1 lean bank. I cannot confirm(as with datamaster logs) if there was a lean bank but judging with my nose it was most definitely rich. After incorporating the idle PE tuning into my latest .bin files I can smell the difference and on a scanner the O2s are around 100mV which is LEAN. If you drove my car a year ago you might even say it wasnt streetable because of the off idle stumble and cam surge but these days it pulls out of 800 rpm as effortlessly as when it was bone stock.

 

Corrections done, you can not just think, you have to do it all.

Yes my idle is super lean, at idle my o2's read 4mv and I find it idles awesome and super nice, however when under load its a totally different ball game, at idle you are looking for a clean burn high peak as the pistons are just along for the ride, richer slows them down/less peak pressure, my car if not leaned out at idle runs like crap, I've tinckered with the MAF tables/integrator locks and got my idle and just a bit off idle to be super lean according to the o2's, which can mean 14.7 in the cc, but heck try to take fuel out while driving holly you can not, add fuel and you're laughing, car smoothes out night and day difference, again, more fuel at idle = car wants to stall coming to a stop and shakes like a ****, under load world flips, you have to try it and think about it for a little longer and it will make total sense.

I tried making my car run leaner while driving and the thing just can not, I mean I can try it again, I'm always up for a try but I've been there and done that with drivability and the more fuel the nicer the drive, the less fuel the nicer the idle. I am sure there is also a point where you give it just enough fuel/just enough timing where it's the best of both world, but heck try finding that median when your MAP/RPM is chaning every millisecond

PS. Play with timing and no difference LOL, less timing down low I found less shaking but car slowed down when I'd give her gas which was funny, more timing was more shaking but she accelerated, more fuel was nicer acceleration and no shaking coupled with more timing.

I am sure there is a point where more fuel will make you stumble like a misfire no doubt, but it will not make sure surge/shake.

 

I have found the timing sweet spot with my tune. You have to be either running open loop or speed density right?