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VTEC_lol

10+ Year Contributor
43
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Mar 18, 2010
Elizabethton, Tennessee
My car is tuned with an safc on the wastegate (9psi) Ive already got a mbc installed and all supporting mods to turn up the boost a little. Say if I run 12-13psi will the maf automatically compensate for the extra air and richen up my a/f or will I need to re-tune my safc?

I want to run 110 at the track when I turn the boost up just to make sure the engine will be safe. I have a plug that blocks the 02 sensor in my 02 housing. If I unplug the 02 sensor for a while will the car still run like it should. Our cars run in closed loop at wot anyways so I dont see it amking a difference
 
VTEC_lol said:
Say if I run 12-13psi will the maf automatically compensate for the extra air and richen up my a/f or will I need to re-tune my safc?
Anytime you change boost levels, you're either taking air away or forcing more air into each cylinder. If you left your tuning the same, turned the boost up, you would see a leaner condition. Turn the boost down, you'll see a richer condition. You will nead to tweak your tuning slightly, but once you have a good tune on it, it's fairly simple to make slight changes.

VTEC_lol said:
If I unplug the 02 sensor for a while will the car still run like it should.
Blocking off your o2 sensor WILL cause you to throw a CEL and WILL throw all of your fuel trims off from the getgo.

Your car uses the fuel maps it already has in conjunction with your o2 sensor to determine how much fuel to deliver to each cylinder. Your SAFC tweaks that signal slightly, but it does not eliminate the need for the sensor if that's what you're asking.
 
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