Apexi SAFC2 Turbo Tune
Joined: Sep 2006
Posts: 5,168
From: Vista, CA or Camp Pendleton
another potential problem you face is if you get in to boost in partial throttle and you lean your car out you can cook your turbo or worse face detonation and pop your motor. ultimatley you asked us is it safe to do this. we have said it isnt safe. if you are asking is it possible yes we have all seen people boost on a budget but there is a reason we dont see them anymore. they blow their car get frustrated and give up on it.
How is it possible to control closed loop tuning w the safc? It would have to rely mainly on the factory ecu. Theres no physical map that u can go into to compensate for the amount of fuel that needs to be trimmed out. For instance, im runnin 550's w a walboro 255 and im almost at -35% fuel @ idle. Is there some setting that u can compensate for this? Its been almost 8 yrs since ive used one but i dont recall any settings to compensate for fuel in that nature.
you cant you would soley rely on the ecu to do all the fuel trim adjustments, but he could also just unplug the front o2 sensor and run open loop all time
Senior Member
SL Member
Joined: Apr 2008
Posts: 543
From: South Florida
End result of ur thread i wouldn't boost ur tc until u have proper equipment and can get tune motors aren't cheap do it right and be done. If ur kit is on i would take it off.
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Junior Member
Joined: Dec 2011
Posts: 11
Thread Starter
Junior Member
Joined: Dec 2011
Posts: 11
the apexi safc2 has a hi and lo throttle setting where you can add or subtract on a graph at chosen rpm points, why cant i use that to set my low throttle to add more fuel when below 50% throttle to account for the boost and add more fuel than what the ECU is really sending ??
the apexi safc2 has a hi and lo throttle setting where you can add or subtract on a graph at chosen rpm points, why cant i use that to set my low throttle to add more fuel when below 50% throttle to account for the boost and add more fuel than what the ECU is really sending ??
So in short the safc will only work for open loop tuning
Thread Starter
Junior Member
Joined: Dec 2011
Posts: 11
Our ecu is a self learning ecu so any fuel adjustment made in closed loop will be zeroed out by the ecu which will always try to run 14.7 in closed loop, the reason the aem FIC doesn't have this problem is because it tricks the ecu into thinking its running the desired air fuel mixture by altering the factory wideband signals.
So in short the safc will only work for open loop tuning
So in short the safc will only work for open loop tuning
Thread Starter
Junior Member
Joined: Dec 2011
Posts: 11
??
Our ecu is a self learning ecu so any fuel adjustment made in closed loop will be zeroed out by the ecu which will always try to run 14.7 in closed loop, the reason the aem FIC doesn't have this problem is because it tricks the ecu into thinking its running the desired air fuel mixture by altering the factory wideband signals.
So in short the safc will only work for open loop tuning
So in short the safc will only work for open loop tuning
If you disconnect the primary o2 sensor it will lock the ECU into open loop and is prob your best bet with the SAFC, thus allowing you to control fuel trims. You could also run e85, upgrade your injectors and fuel pump and prob get away with running more boost even though the SAFC does not adjust timing. Hope this helps
Senior Member
SL Member
Joined: Apr 2008
Posts: 543
From: South Florida
I understand how u feel u just cant wait. I have been on boost maybe 8 months after i had my tc blow up after 3 yrs decided to sell and i just finished building a crazy kit and i cant wait to put it on but i refuse to until i have every little piece. Our cars r trouble makers soo try to get it as perfect as possibly u will have more fun and less head ache.
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