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Old 06-14-2019, 06:44 PM   #1
Andeker
 
Drives: 2014 2SS/RS LS3
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NPP question?

I recently purchased a lightly used 2013 ZL1. In my haste to sound cool I instantly pulled the fuse for the flaps. I have since decided I my want "quiet" on occasion and purchased the mild2wild switch. Before installing I put the fuse in just to check things. I started the car and was instantly confused. If I'm not mistaken momentarily after startup the flaps should close, but they stay open.

Am I wrong that the flaps are supposed to be closed at idle? When vehicle off actuators movable by hand. Are there any other common ways the previous owner May have defeated them? Most obvious mod is rotofab intake, so possibly has a tune. Could a tune turn off app?

Thanks in advance.
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Old 06-14-2019, 09:38 PM   #2
ZMEnow

 
Drives: ZL1, 2013, tri-coat-red, manual
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Quote:
Originally Posted by Andeker View Post
I recently purchased a lightly used 2013 ZL1. In my haste to sound cool I instantly pulled the fuse for the flaps. I have since decided I my want "quiet" on occasion and purchased the mild2wild switch. Before installing I put the fuse in just to check things. I started the car and was instantly confused. If I'm not mistaken momentarily after startup the flaps should close, but they stay open.

Am I wrong that the flaps are supposed to be closed at idle? When vehicle off actuators movable by hand. Are there any other common ways the previous owner May have defeated them? Most obvious mod is rotofab intake, so possibly has a tune. Could a tune turn off app?

Thanks in advance.
They are open on cold starts until warm up.
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Old 06-14-2019, 09:41 PM   #3
DrkPhx

 
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Flaps are vacuum actuated and open at idle, close at part throttle and open at WOT. I have an exhaust controller that gives 2 options; closed at all times or factory settings. It's nice if you have headers to give a stealthier sound.
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Old 06-15-2019, 08:56 AM   #4
Crash76
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I have a three way controller, open, closed, and stock
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Old 08-04-2019, 04:10 PM   #5
raisingarizona
 
Drives: Acura MDX
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Quote:
Originally Posted by Andeker View Post
I recently purchased a lightly used 2013 ZL1. In my haste to sound cool I instantly pulled the fuse for the flaps. I have since decided I my want "quiet" on occasion and purchased the mild2wild switch. Before installing I put the fuse in just to check things. I started the car and was instantly confused. If I'm not mistaken momentarily after startup the flaps should close, but they stay open.

Am I wrong that the flaps are supposed to be closed at idle? When vehicle off actuators movable by hand. Are there any other common ways the previous owner May have defeated them? Most obvious mod is rotofab intake, so possibly has a tune. Could a tune turn off app?

Thanks in advance.
Only the Forza controller will provide an always closed option.
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Old 08-04-2019, 07:23 PM   #6
RobZL1
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Originally Posted by raisingarizona View Post
Only the Forza controller will provide an always closed option.
That's not entirely true. It might be the only one you can purchase as a kit that does that, but you can also replace the relay and wire a 3-position switch to provide the always closed, always open, or stock options. The always closed position is great for cold starts in the morning and leaving the neighborhood.
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Old 09-20-2019, 06:46 AM   #7
FasNuf
 
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Quote:
Originally Posted by RobZL1 View Post
That's not entirely true. It might be the only one you can purchase as a kit that does that, but you can also replace the relay and wire a 3-position switch to provide the always closed, always open, or stock options. The always closed position is great for cold starts in the morning and leaving the neighborhood.
Can you PM me details on this relay?
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