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Got a Wideband finally and tuned

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sickguy

sickguy

15+ Year Contributor
102
0
Dec 21, 2003
Fremont, California
Hey guys, for you who read my previous posts know that I had little luck tuning my car using just SAFC and logger, so I got a Zeitronix wideband finally and tuned it. I got all the supporting mods including 550cc injectors, 190lph fp and Hanh SMIC, pls refer my profile for complete mods. I'm still not quite sure what Air Fuel Ratio I should tune for. Below is a run I logged with 18psi of boost. Please keep in mind it runs on Octate 91 gas so I believe it should run a little richer to keep it from knocking. The log looks fine to me except it's quite messy before full boost at around 3.3k rpm. I've included the Wideband AFR so please give me some input on what I should do. Thanks!
 
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<td height=17 style='height:12.75pt'><right>RPM</td>
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dude you are runnin REALLY rich you should shot for 11.5 to 12 when your WOT you need to take out some fuel and turn the boost up a little your running fine but ur at 10 on the WB i run mine around 11.5 at wot
 
yea man your rather rich .. being very rich is almost as bad as being very lean. being to rich also drains your car of all its power. if i were you i would set my high settings -25 across the board and start from there
 
good point man.. it does drain power out of your car
 
Thanks for the advice. I read it from kpt4321's (an experienced tuner here) posts that he had to run below 10.5 and close to 10.0 AFR to keep the car from knocking with a SMIC, that's why I tuned for ~ 10.2 . I'll try again shooting for 11.0 tomorrow morning (best time for tuning on freeway) to see if it improves or knocks more. Thanks.
 
Unless your running racegas, you don't want to run anywhere near 12.0:1, esp on 91 octane. I have my car tuned to 11.4:1 and it runs great. Good Luck
 
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