Lex and Stock A/F screw adjust??

[PorterzSupra]

I have a Lex unit and was woundering besides raising F/C what other function would the scew serve in tunning the engine? Does it make a car run richer or leaner depending on the screw position? I just left mine stock setting for now, Whats the deal? I tryed looking it up but couldent find anythin. Could somone please exaplin exactly what adjusting it in or out does? THX!

 

[aye mate]

http://www.supramania.com/forums/showthread.php?t=1811
It makes it run leaner cause more air is coming into the engine, but the air is unmetered so the ECU doesn't know to add more fuel. More air + same amount of fuel = leaner. Our cars run rich anyway so turning out the screw on the stock unit isn't bad. I would upgrade the fuel system before I put the Lexus unit on. You don't *need* to, but as a precaution, I would.

 

[PorterzSupra]

I dont understand because the O2 sensor would read and make adjustments so whatever the computer wants to see for a air/fule ratio it will make. So by adding more unmetered air the 02 would send a leaner signal and the computer would add more fule untill it saw the mixture it wanted

 

[isnms]

http://suprasonic.org/lexusriemer/lexusnotes.html