[Diy_efi] Newb tuner

[Michael Richards]

> How effectively can you tune a mildly boosted modern efi car with just
> a wide-band o2 sensor, data logger, and with or without an
> accelerometer like g-tech.  Is it generally safe to just shoot for a
> specific air fuel ratio and leave the stock timing alone by just
> pulling a bit out as boost goes up? or Do you really need a dyno to be
> just safe, rather than ultimately fast?

Yes it's generally pretty safe to do it that way. Ignition is usually 
less forgiving of errors than mixture. I would recommend pulling about 
0.75 degrees of timing per PSI of boost. Anything about 2-3PSI of boost 
you will want to shoot for 11:1 AFR. This is conservative but it should 
get you in the ballpark. 

-Michael
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