throttle body vs tps vs iac vs SCT - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 5 Old 09-19-2016, 02:30 PM Thread Starter
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throttle body vs tps vs iac vs SCT

Mass-air foxbody question;
Would an SCT tune have control over the IAC function? You can do the procedure to set t.b. position, check tps voltage, and connect iac, but in the end can an SCT custom tune override whatever factory setting would normally step in and make factory fine tuning adjustments?

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post #2 of 5 Old 09-19-2016, 04:29 PM
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yes, the tuner would have access to modify the IAC control duty cycle. He would leave the learning adaptive on and tune the ISC scalers, dashpot, and transfer table to control idle.


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post #3 of 5 Old 09-20-2016, 08:35 AM Thread Starter
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Second part of this question would be then, is an idle reset procedure useless without having control over the tuners settings? If you move the t.b. setscrew or the tps/voltage, the tuner settings are now invalid?
Next question would be is the ignition and injector settings also controlling some idle or low rpm control which may be factor here.
Getting this feeling that one minor adjustment to t.b. or change to tps alignment can cause a whole mess to neutral idle and rpm decel control up to low rpm drivability, pretty much fawk everything.

Not to get too sidetracked but if base timing was 9deg and reset to 10deg, does the SCT tune input total timing or a factor/adjustment add-on through the RPM?
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post #4 of 5 Old 10-17-2016, 08:29 PM
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moving the TPS voltage has no affect, it zeros RATCH.

TB position, is airflow dependent, you need to tell the ECM how much it flows at closed throttle, that is how idle speed and IAC function in concert.

You are not going to change the duty cycle, you are going to change the amount of air, the IAC transfer will dictate, the duty cycle, you do not want to touch the IAC transfer.

Remember,

air entering past MAf=to TB air + IAC air.

750 rpm idle=a certain amount of air in the Maf transfer.

you want 750 rpm at some idle state

that maf voltage = air=TB air,,,,,,,then the IAC adds or takes air away so the MAF = 750 rpm air/voltage measured.

So you see its key to have the actual TB air to be accurate.

Ie within the ISCKAM limits.

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post #5 of 5 Old 10-18-2016, 04:29 AM Thread Starter
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Thanks for the info and explanation. Spoke to a another tuner and basically said the same thing.
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