Grille overlay - impact to engine from airflow reduction/redirect?

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navyseal334

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23 Suburban Duramax 3.0 here. Considering a snap-on grille overlay but am concerned about the potential reduction in airflow and the impact to the engine/vehicle.

Can anyone comment on their experience if they've used an overlay or comment whether the reduction (or redirection) in airflow could be substantial enough to impact fuel mileage/cooling ability? As I understand it, airflow is more crucial to a gas engine for fuel performance than a diesel; correct me if I misunderstand. But I imagine cooling would be still be a factor for diesel.

Would impact be tolerable in normal conditions but exacerbated under load (e.g. towing) or in high heat (currently residing in Mesa, AZ with 120 degree summers)?

 

Trey Hardy

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23 Suburban Duramax 3.0 here. Considering a snap-on grille overlay but am concerned about the potential reduction in airflow and the impact to the engine/vehicle.

Can anyone comment on their experience if they've used an overlay or comment whether the reduction (or redirection) in airflow could be substantial enough to impact fuel mileage/cooling ability? As I understand it, airflow is more crucial to a gas engine for fuel performance than a diesel; correct me if I misunderstand. But I imagine cooling would be still be a factor for diesel.

Would impact be tolerable in normal conditions but exacerbated under load (e.g. towing) or in high heat (currently residing in Mesa, AZ with 120 degree summers)?

I’ve put billet grill overlays in every vehicle I’ve owned and never seen a difference in cooling temperatures or transmission temps
I wouldn’t worry about it
 

GoNoGo

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The Duramax "lower grill" is open from the factory specifically for additional airflow, whereas the gasoline model "lower grill" is blocked off from the factory.

I think it would be a BAD idea to restrict airflow through any of the grills on the Duramax equipped vehicles.. and I have one of each.
 

Stbentoak

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There is really no substitute for removing the stock grille and having it professionally sprayed by a body shop if you want something that looks sharp and will last……
 

Vladimir2306

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An acquaintance of mine put a grid on the t1 tahoe, as a result, he has 10 degrees Celsius higher automatic transmission temperature in all modes than mine. I have 65 in the city, he has 75. I'm 70 in the heat, he has 80-85. I am against nets, they greatly disrupt the movement of the oncoming flow of the swelling
 

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