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Old 09-05-2014, 07:11 PM   #1
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The ST 'shutters' cover the entire radiator and intercooler

Watching a utube video of a replacing the intercooler and the stock set of 'shutters' (for aero mpg performance) cover the entire front from the top of the radiator down across the turbo intercooler.

I wonder how sophisticated the shutter programming is?
Do the radiator and intercooler shutters operate independently? (seemss like one motor for both top and bottom from the video I posted)

https://www.youtube.com/watch?v=cGYYEUUNisQ
at 5 minutes they remove the shutters
Interesting the shutter had a wide 'closed' area between the top ones, and the bottom ones. even though the radiator extends the full height of the space.


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Old 09-06-2014, 12:54 PM   #2
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The closed area is probably for the impact beam, no point in putting a shutter where you've got a wide solid piece of steel in the way.
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Old 09-06-2014, 02:08 PM   #3
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Quote:
Originally Posted by Elizabeth View Post
Watching a utube video of a replacing the intercooler and the stock set of 'shutters' (for aero mpg performance) cover the entire front from the top of the radiator down across the turbo intercooler.

I wonder how sophisticated the shutter programming is?
Do the radiator and intercooler shutters operate independently? (seemss like one motor for both top and bottom from the video I posted)

https://www.youtube.com/watch?v=cGYYEUUNisQ
at 5 minutes they remove the shutters
Interesting the shutter had a wide 'closed' area between the top ones, and the bottom ones. even though the radiator extends the full height of the space.
The center portion is over the crash bar anyway, so no airflow would get to the radiator there.

Quote:
Active Grille Shutter

The grille shutter actuator positions the grille shutters based on commands from the PCM . The grille shutter moves 90 degrees from fully closed to fully open and, based on the position commanded by the PCM , is set in 1 of 16 positions (approximately 6 degrees between positions).

During normal operation, the grille shutter may be partially to fully open when the engine is off, depending on the ambient temperature. When the engine is started, a calibration of the grille shutter system occurs, which typically takes 15-20 seconds. The grille shutter system performs the calibration sequence by detecting the end positions, open and closed. The calibration sequence can begin in either direction, open or closed, and continues until it is successful or a fault is sensed. A long pause may occur between the 2 portions (open/close) of the calibration sequence. Calibration of the grille shutter system cannot be manually requested, it only occurs as determined by the grille shutter actuator. If certain faults are present (shutter blocked or actuator error), a recalibration is initiated in an attempt to resolve the problem. If the problem is not resolved after a calibrated number of attempts (usually 3 or 4), a timer starts and sets a DTC when the timer reaches a predetermined limit. Other faults also trigger a recalibration request, but not until a grille shutter DTC is set in the PCM .

The PCM communicates the desired position (open or closed) of the grille shutter based on various PCM inputs (vehicle speed, coolant temperature, ambient temperature, A/C system pressure, etc.). The PCM communicates to the grille shutter actuator via a LIN . The LIN supports bi-directional communication between the grille shutter actuator and PCM , allowing the grille shutter actuator to communicate position and fault information to the PCM .

The PCM sets grille shutter Diagnostic Trouble Codes (DTCs) when the fault information is communicated by the grille shutter actuator for a predetermined amount of time. Any failures of the LIN for over 10 seconds continuously results in the grille shutter actuator positioning the grille shutter fully open. There is no indication to the driver of the vehicle when a fault with the grille shutter system is present or a grille shutter DTC is set in the PCM .

Component Description

Grille Shutter Actuator

The grille shutter actuator is a smart motor which receives position requests from the PCM via the LIN . One of the grille shutter blinds connects to the grille shutter actuator using a retainer. The grille shutter actuator can be serviced individually or as an entire assembly, which includes the grille shutter, grille shutter actuator, retainer, housing and jumper harness.

Grille Shutter

The grille shutter is comprised of shutter blinds which are linked to each other. One of the individual shutter blinds is fixed to the grille shutter actuator. When the grille shutter actuator moves, it moves the attached shutter which causes the other linked shutters to move. The grille shutter is serviced as an assembly (individual shutter blinds are not serviceable) or as an entire assembly, which includes the grille shutter, grille shutter actuator, retainer, housing and jumper harness.
From the Factory Service Manual.
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Old 09-06-2014, 04:27 PM   #4
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Thanks
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Old 04-02-2018, 09:54 AM   #5
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I'm re-hashing this thread.

Has anyone removed these shutters? I feel like the car would be better off from an intercooler standpoint to have these removed, the drawback being in winter climates--like we're still experiencing today--could cause the car to reach operating temperature considerably slower.

Is there any performance gain to remove these or is it more trouble than it's worth? TIA
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Old 04-02-2018, 10:22 AM   #6
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Quote:
Originally Posted by Niton View Post
I'm re-hashing this thread.

Has anyone removed these shutters? I feel like the car would be better off from an intercooler standpoint to have these removed, the drawback being in winter climates--like we're still experiencing today--could cause the car to reach operating temperature considerably slower.

Is there any performance gain to remove these or is it more trouble than it's worth? TIA
anyone with an aftermarket intercooler has removed them for clearance. Can't speak for what it does to cold start days personally but I imagine it is just fine. It is mostly an MPG thing.
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Old 04-04-2018, 08:29 AM   #7
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If you track your car, remove the shutters. It helps with cooling.

The issue with removing them is it does impact fuel economy. If you don't care about that then I'd yank them out.

When I replace my front bumper I'm removing mine.
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Old 04-04-2018, 10:18 AM   #8
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Quote:
Originally Posted by MK3 ST3 View Post
If you track your car, remove the shutters. It helps with cooling.

The issue with removing them is it does impact fuel economy. If you don't care about that then I'd yank them out.

When I replace my front bumper I'm removing mine.
I've had my ST for five years now. Never seen a hit to my fuel economy without the shutters.

Sent from another garage.
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Old 04-04-2018, 02:50 PM   #9
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Quote:
Originally Posted by UnFocusedST View Post
I've had my ST for five years now. Never seen a hit to my fuel economy without the shutters.

Sent from another garage.
Hmm, I've heard it drops 1-2 MPG off. I am lucky to get 25 MPG now, so when I take mine off I hope my MPG does not suffer.
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Old 04-04-2018, 03:37 PM   #10
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Quote:
Originally Posted by MK3 ST3 View Post
Hmm, I've heard it drops 1-2 MPG off. I am lucky to get 25 MPG now, so when I take mine off I hope my MPG does not suffer.
The best milage I had was with Mobil 1 Full Synthetic oil, Kumho 4X tires (oem size) on TSW Nurburgring wheels, Cxracing intercooler and a green filter. I was able to get 36MPG on the highway with my cruise set at 65MPH.

Sent from another garage.
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