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safc and injectors

Old 03-04-07, 02:32 PM
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safc and injectors

what is the biggest size of injectors that the safc can handle?? i can't really find anything anywhere. i remember reading that they couldnt control anything past 750 cc injectors. thanks.
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Old 03-09-07, 04:29 PM
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afc goes a max of +/- 50% of the original fuel...

u can get away with a little bigger tho.. but u'll run rich at idle/cruise
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Old 03-12-07, 03:25 AM
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Originally Posted by cezonetheillest
what is the biggest size of injectors that the safc can handle?? i can't really find anything anywhere. i remember reading that they couldnt control anything past 750 cc injectors.
Turned down to -50%, you could theoretically run injectors with twice the total capacity of the stock ones, i.e. 4x1100cc/min or 2x550cc/min and 2x1650cc/min, and still achieve factory mixtures. But the major limitation of AFM interceptors is that the more negative correction you apply, the more advanced the ignition timing gets. Ignition timing is determined by airflow just like fuelling, with the ECU retarding timing as load increases to prevent detonation. By sending a reduced airflow signal to lean out the mixtures, you also end up with ignition timing not as retarded as it would normally be, which increases the chance of detonation.

Personally I'd be wary about going below -20%. 750cc/min secondaries would require -15% to get back to stock mixtures, which gives you a bit of scope for leaning out the mixture further for more power. So while the S-AFC can control injectors bigger than this, I wouldn't do it.
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Old 04-04-07, 10:51 PM
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in running 800cc secondarys, no problems till today with the safc.
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Old 04-04-07, 10:52 PM
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in running 800cc secondarys, no problems till today with the safc. thought last time i couldn't tune the car well on the dyno cause fuel pump problems and my fpr was a pos, upgraded to a aeromotive and will see how it goes next time on the dyno which will be very soon.

later
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