Quote:
Originally Posted by roflwaffle
It'd be nearly impossible to run it lean since an Atkinsonized cam should let in less air during open loop WOT/idle. Closed loop would be no problem, just the equivalent of running from 0-whatever% load given the new cam profile.
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Assuming you have full access to the original factory tune, then you would be fine, and you'd be able to lean it out in small steps to get her back into tune. Most of the time, my experience is that this isn't possible.
If you just threw the cams in and ran the original program stock, the car might run like crap. It'd be running rich until the O2 sensor warmed up, and the spark curve would be off. Even though cars now have a MAF system it is only used to adjust steady-state fuel-trims. Cars still rely on the speed-density charts system for a baseline. With a new cam, that baseline is going to be off.
Of course this only applys if the cam your putting in is aggressively different. A few degrees here or there, and the general correction coefficients would take care of everything.