Tested! Honeywell Garrett Upgraded Intercooler for the EcoBoost Mustang

by Mike Kojima


The Turbo Mustang is an often overlooked choice when looking for a great track car to build. A not so secret fact no one seems to consider is that the turbo 4 is lighter on the nose than the Coyote V-8, and thus, the car has the greatest handling potential of all the Mustangs. 

The folks at HPS, the makers of fine silicone hoses and couplings, have obtained a Turbo Mustang for this reason and have started to do some basic bolt ons to it. They have been running the car for fun in Street RWD Time Attack class and we felt their car would be the perfect test bed for Honeywell Garrett's new upgraded drop-in intercooler. 


Our Mustang is a late model turbo model with an engine that has a handful of very simple bolt on mods, but is otherwise pretty stock. It will be a perfect test bed for Honeywell Garrett's new intercooler.


The core thickness of the Honeywell Garrett intercooler dwarfs the stock intercooler. The stock intercooler's core is about 3.2" thick, while the Honeywell Garrett intercooler is a buff 5.32". The inlet and outlet pipes of the Honeywell Garrett intercooler are also longer than stock, ensuring a leak free hose connection. It is a completely drop-in piece that requires zero modifications. 


Let's get started with our test! We start by removing the the underneath belly pan and the front bumper.


Removing these items allows the removal of the front shroud that has an ECU controlled shutter. This controls airflow to the front of the radiator and the intercooler. Under part throttle highway conditions this shutter closes to reduce airflow through these heat exchangers, reducing drag. We removed this shutter system in order to allow maximum airflow to the intercoolers from our dyno fans and to keep the temperature data as consistent as possible between the stock and Honeywell Garrett intercoolers.


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Wednesday, August 02, 2017 8:14 AM
The end tank design on the Garrett IC is way better than stock. For sure it has less pressure drop than the stock IC but it appears Garrett was also able to get more even flow distribution across the IC core compared to the stock design.
Mike Kojima
Mike Kojimalink
Wednesday, August 02, 2017 8:35 AM
I was really impressed with this intercooler. At first, I was thinking thick core, low frontal area, not gonna work well but I was wrong.
Wednesday, August 02, 2017 2:50 PM
maybe its a Washington vs California thing, but I don't think the Ecoboost Mustang is overlooked at all. nearly every S550 Mustang I see at a track or autox event is an Ecoboost... and outside of my local events, I see a lot more Ecoboost product demo Mustangs than the V8's.
Wednesday, August 02, 2017 5:15 PM
@warmmilk Possibly. I never really see any Ecoboost Mustangs at Socal tracks, unless I'm just overlooking them. I always see V8 S550s.
Wednesday, August 02, 2017 5:44 PM
I guess people in socal are smarter... :D
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