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Turbo KA Idle Question

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Old 03-05-2006, 03:31 PM
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Default Turbo KA Idle Question

Ok, I have a 95 S14 with the factory KA motor, and its running a turbo setup with larger injectors, larger fuel pump and a handful of other goodies, and I'm using an Apexi S-AFC II Fuel Controler for fuel management. My question is this, After ripping on the car, if the RPM's are 5000 or above and I clutch in, the RPMs fall down to 500 then the car tries to pick itself back up but doesnt and just dies. Even if I am not at full throttle then clutch in when the cars running 5000+ rpms, the rpms fall down but dont pick themselves back up to idle, and the car dies. The lower the RPMs and i clutch in, the less the problem. So i was wondering what do I need to do to prevent this, just raise the idleing speed a little? increase fuel somewhere? Let me know what you think, and how to do it. Oh, and If the RPMS are free falling from 5000+ but I blip the throttle around 2000-1000, the motor will find idle fine, its just the long fall from the higher rpm range thats killing it.
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Old 03-05-2006, 04:02 PM
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Default Re: Turbo KA Idle Question

Do you have an atmospheric BOV? If so, that's why.
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Old 03-05-2006, 07:31 PM
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Default Re: Turbo KA Idle Question

is there anyway to minimize this using what I have?
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Old 03-05-2006, 07:57 PM
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Default Re: Turbo KA Idle Question

Yes, there are settings in the SAFC to compensate for an open air BOV.
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Old 03-05-2006, 09:11 PM
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Default Re: Turbo KA Idle Question

Originally Posted by igy
Yes, there are settings in the SAFC to compensate for an open air BOV.
but they kinda suck. Invest in a recirculating BOV. It'll make a word of difference. With the S-AFC it seems to be a give-and-take with the DEC-AIR settings. Tru they'll keep your car from dying after letting off the throttle but idle and cold-start are shittified.

If yours is adjustable, try tightening it a lot for now.

Another "in the meantime" when you know you're about to let off the throttle completely, do so very slowly and give the MAF time to figure out whats going on.
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Old 03-05-2006, 09:32 PM
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Default Re: Turbo KA Idle Question

the miata did the same thing, but it was NA and prob just fucked up. all i did was throw on the AC to raise the rpms a little and it never did it again. dont ask me tho
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