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| Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-26-2016, 07:11 AM
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#1 |
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Is the butterfly valve in the throttle body supposed to be closed shut?
I had high negative LTFT (-10 to -15%) on idle and off throttle for a while when I had my Perrin CAI installed. Also had rpm dips when I came up to a stop that would blink off my DRL LEDs. But now it's back to normal (positive 2-5%) with my stock airbox installed.
During the swap, I noticed the butterfly valve in the throttle body was slightly open. Picture is attached. Is this normal? http://imgur.com/cFZvyWk |
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06-26-2016, 11:09 AM
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#2 |
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You need to scale the MAF when running an aftermarket intake such as the one from Perrin.
http://www.ft86club.com/forums/showt...01#post1842501 http://www.ft86club.com/forums/showthread.php?t=83945 IIRC it is normal for the throttle to be open a little bit.
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| The Following User Says Thank You to D_Thissen For This Useful Post: | tracerit (06-26-2016) |
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06-26-2016, 03:34 PM
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#3 | |
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Quote:
 humfrz |
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06-27-2016, 04:05 AM
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#4 |
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Took the words right out of my fingers @humfrz
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| The Following User Says Thank You to COO86L For This Useful Post: | humfrz (06-27-2016) |
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06-27-2016, 12:33 PM
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#5 |
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yes, the throttle body stays slightly open. I had the same concern the first time I took mine off
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06-27-2016, 07:12 PM
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#6 |
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The neutral position for the throttle body is slightly open. This position is close to where it sits at idle.
The ECU can fully close it. Also, it can go past fully open... |
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