Hoon
Autocross Champion
- Location
- Rhode Island
I've been waiting until i had an apples to apples comparison to post this, but i now feel i have sufficient data.
When i built the motor i switched from the Unitronic intercooler to AMS. The only other change that can affect airflow was going from a 3" DP with a 100 cell race cat, to a 4" catless. You can imagine i was surprised to see that the car was failing to meet boost targets with the wastegate mapping from the stock motor.
In very similar environmental conditions, the Vortex XL now takes 8% more wastegate to hold the same 35psi boost as before. Clearly i didn't lose exhaust flow, so i had to look at the IC.
The IATs are better with the AMS than Uni, but my data shows i have to drive the turbo harder to make the same PSI. A quick trip over to Mygolfmk7.com shows Jeffs test results mirror what i'm seeing in the real world. At 28" H20 (Negative 1 psi) the Uni flows 229 CFM and the AMS flows 199. Based on the output of the car, it's moving 750-800cfm, meaning i have at least a few PSI pressure drop across the IC.
I'm only getting about 15 degrees above ambient after a 40-140 pull, so its cooling well, but there are options that cool as well without the restriction.
Jeffs data:
http://mygolfmk7.com/2020/06/ams-performance-intercooler-flow-test/
When i built the motor i switched from the Unitronic intercooler to AMS. The only other change that can affect airflow was going from a 3" DP with a 100 cell race cat, to a 4" catless. You can imagine i was surprised to see that the car was failing to meet boost targets with the wastegate mapping from the stock motor.
In very similar environmental conditions, the Vortex XL now takes 8% more wastegate to hold the same 35psi boost as before. Clearly i didn't lose exhaust flow, so i had to look at the IC.
The IATs are better with the AMS than Uni, but my data shows i have to drive the turbo harder to make the same PSI. A quick trip over to Mygolfmk7.com shows Jeffs test results mirror what i'm seeing in the real world. At 28" H20 (Negative 1 psi) the Uni flows 229 CFM and the AMS flows 199. Based on the output of the car, it's moving 750-800cfm, meaning i have at least a few PSI pressure drop across the IC.
I'm only getting about 15 degrees above ambient after a 40-140 pull, so its cooling well, but there are options that cool as well without the restriction.
Jeffs data:
http://mygolfmk7.com/2020/06/ams-performance-intercooler-flow-test/