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Larger throttle body/intake opening effects?

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Old Jan 30, 2009 | 09:34 AM
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Default Larger throttle body/intake opening effects?
Typically, what changes (besides the obvious VE) would I need to do to the tune when installing something like a FAST92 w/ throttle body. Since the area of the throttle body has changed, what else would need to be calibrated? MAF?
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Old Jan 30, 2009 | 09:53 AM
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You will need to recheck everything, VE first then MAF as per normal process
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Old Jan 30, 2009 | 11:08 AM
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Originally Posted by Ryan L
Typically, what changes (besides the obvious VE) would I need to do to the tune when installing something like a FAST92 w/ throttle body. Since the area of the throttle body has changed, what else would need to be calibrated? MAF?
If you are switching from stock, you will need a full drivability tune to get it back to perfect and to figure out if the TB needs to be drilled. If you are going from a 90/90 to a 92/92, I bet you wont see much of a change at all unless the old TB is drilled and the new one isn't.
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Old Jan 30, 2009 | 11:48 AM
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This is for an electronic throttle (Corvette) and I'm assuming IAC changes will need to happen since there will be no TB drilling.
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Old Jan 30, 2009 | 11:59 AM
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If you are going from stock to the FAST 90/90, 92 etc. you'll need to adjust effective area and desired airflow -no drilling required.
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Old Jan 30, 2009 | 12:15 PM
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Originally Posted by Doc
If you are going from stock to the FAST 90/90, 92 etc. you'll need to adjust effective area and desired airflow -no drilling required.
It's funny that you responded since you might be the one doing the install and tune.

I'm the person who has inquired about the clutch install (Ryan from St. Aug.)
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Old Mar 3, 2009 | 05:53 PM
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Originally Posted by Doc
If you are going from stock to the FAST 90/90, 92 etc. you'll need to adjust effective area and desired airflow -no drilling required.
Why do you have to adjust the IAC Effective Area? Is the opening for the IAC valve larger in the bigger throttle bodies? I've seen an Excel Sheet that provides a multiplier for the Effective Area but don't see how it relates to the steps on the IAC. IAC is a throttle body bypass isn't it?
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Old Mar 3, 2009 | 07:32 PM
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Originally Posted by kenp
Why do you have to adjust the IAC Effective Area? Is the opening for the IAC valve larger in the bigger throttle bodies? I've seen an Excel Sheet that provides a multiplier for the Effective Area but don't see how it relates to the steps on the IAC. IAC is a throttle body bypass isn't it?
Must have been a long day... your'e right the multiplier needs to be adjusted.
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Old Mar 5, 2009 | 09:14 AM
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OK. Thanks. I'm a mere novice with tuning and am trying to get my F.A.S.T. 92 intake and UMI 90 dialed in. Just wanted to make sure I wasn't missing something.
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