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Old 02-19-2009, 04:51 AM   #1
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Cas?????

Anybody know anything about adjusting the air/fuel ratio without having to get a tune? Somebody told me I could adjust my CAS, I forget what the acronym means. I thought the only way to adjust air/fuel ratio was to tune.


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Old 02-19-2009, 06:52 AM   #2
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your asking for trouble without a tune, if you run to lean you will damage the engine and to rich, well it will run like crap.

The way a tune changes the air/fuel ratio is it changes the time length the fuel injectors are open, it does not regulate fuel pressure at all. The pressure regulator does not change under all the conditions the car will be under such as when its warming up, when it is as WOT, under a heavier load, ect, ect.
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Old 02-19-2009, 09:38 AM   #3
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your car runs mostly off of input from the oxygen sensors. So no you cannot change that without a tune. There are no "mixture screws" on our "carburetors".
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Old 02-19-2009, 01:15 PM   #4
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Thanks for the input. I guess I'll have to do a tune then. The thing I hate is that I have a ZX5 and a SVTF and it just sucks to have to have a tuner for each car then they can only hold 3 tunes.
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