This is the third installment of the Intercooler comparison...

Part I of the test...IPP Intercoolers versus Stock Intercoolers ! PartI ~ The Bench Test

Part II of the test...IPP Intercoolers versus Stock Intercoolers ! Part II ~ Cruise, In-Car Road Tests

Again, a special thanks to Jeff "Flyboy" for making sense of all this data...I defer to him for answers to your questions; and Sal from Elite Motorsport in Medford NY for helping with the installs. If you are in the NY Metro area and need any Audi/V-Dub work done, Sal is the man; And, a special special thanks to box_of_partS4 who stepped up and loaned me his APR RS4 IC hoses when no-one else could get them to us in time.

RS4 Intercooler Bench Test

Objective - Determine how the RS4 intercooler responds to heating and cooling under conditions similar to what the stock and IPP intercoolers were tested under.

Procedure - The same as for the stock and IPP intercoolers.

Configuration - The same as for the stock and IPP IC test.

Constraints - The same as for the stock and IPP IC test.

Results - The chart below shows the results for all three intercoolers. The RS4 intercoolers rose in temperature at the same rate as the IPP intercoolers, less than the stock IC's, but reached a steady state temperature 10 degrees Fahrenheit higher than the IPP intercoolers. Once the fan was turned on the RS4 intercoolers cooled more rapidly than the stock or IPP intercoolers. The steady state cool temperature of the RS4 IC's was 1 degree warmer than the IPP intercoolers.



The next chart shows the rate of cooling once the fan was turned on and the intercooler began to cool down. Over the first 30 second measurement interval the RS4 IC's cooled most rapidly; the IPP IC's cooled the slowest. (Note that the stock intercoolers did not begin to cool immediately, as the IPP and RS4 IC's did.)



Over the next 30 second measurement interval the trend remained the same. By 90 seconds all three IC's were cooling at an equivalent rate.

The affect of the different rates of cooling shows up on the first chart. Both the RS4 and IPP intercooler begin to show a bottoming out in the rate of cooling around 120F. Both IC's are close to their steady state temperature at this point. In cooling to 120F the RS4 intercooler drops 75F in 120 seconds. The IPP intercooler drops 65F in 150 seconds. By more rapidly cooling, the RS4 IC's produces a greater total temperature drop over shorter period of time as compared to the IPP intercoolers.

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Part I of the test...IPP Intercoolers versus Stock Intercoolers ! PartI ~ The Bench Test

Part II of the test...IPP Intercoolers versus Stock Intercoolers ! Part II ~ Cruise, In-Car Road Tests

Part IV of the test....Stock versus IPP versus RS4 Intercoolers - Part II - The Road Tests

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