A Revo turbo inlet hose was made available for testing by another GTI owner who loaned it for this flow test.
The Revo inlet hose differs from the turbo inlet parts that have been previously tested by virtue of it being a hose that connects from the airbox to the turbocharger without the use of a turbo inlet elbow. Instead of an elbow the Revo inlet uses a small transition that is part bell mouth and part locking mechanism.
Test setup is the same as with other inlet elbows, with the top half of the GTI stock airbox attached to the inlet of the hose and the outlet to an adapter that connects the part to the flowbench.
The flow test is first performed using an adapter that is sized the same as the inlet to the IS20/IS38 turbocharger compressor.
With this adapter the Revo inlet hose flows 405 CFM. This ranks among the group of highest flowing stock adapter setups that I’ve tested.
Note: The Revo inlet hose is comparable to other inlet elbows that require the use of a larger than stock hose. A number of inlet elbows that have been tested previously were tested using a stock accordion hose only.
Next a silicone adapter is used to attach the Revo inlet to the flow bench. This adapter simulates what a larger than stock turbocharger might have for a compressor inlet. There is no specific turbocharger model that the adapter simulates.
With the larger adapter the Revo flowed 452 CFM. This is at the bottom end of the setups that I’ve tested with aftermarket hoses.
The charts below show the Revo results along with other products that have been tested:
Flow testing of the Revo inlet produced airflow measurements of 405 CFM with an adapter replicating the IS20/IS38 turbocharger housing, and 452 CFM with a large adapter.
The Revo inlet is among the best performing inlets when paired with a stock turbo housing. With a larger than stock turbocharger inlet the Revo does not flow as well as other products that have been tested.
Looking the part over and comparing dimensions with other elbows that have been tested the inlet to the metal adapter is the largest of the inlets that I have measured. It doesn’t appear that the Revo inlet takes advantage of that size due to the construction of the inside of the silicone hose. There’s a decrease of the inside diameter about an inch into the hose, which helps position the metal adapter, but at the same time it reduces the hose cross section down to about 69mm whereas the adapter inlet is 74mm. On the outlet side the ID is 48.1mm which is on the smaller side of the parts I’ve tested.