Professionally engineered performance for 350 - 525 horsepower applications
utilizing 40 - 55 lb/min turbochargers.
The legendary APS front mount intercooler has quickly become the benchmark
for all front mount intercooler systems for the Impreza WRX. Extremely high
flow rates and massive temperature reduction - a level of performance that
other manufacturers can only aspire to achieve.
APS has now upped the ante even further with the release of the D/R 525 front
mount intercooler system, specifically designed for high horsepower Subaru
WRX and STI engines.
Unlike other systems that require cutting of structural components at the
front of the vehicle, APS has designed the D/R Series FMIC with a truly bolt-on
replacement unit that not only maintains the structural integrity of the vehicle,
but also forms the perfect mount to accommodate the largest FMIC available
for a WRX and STI.
APS shoehorned the optimum sized intercooler core for the target power levels,
but with the greatest frontal surface area possible.
This provides the maximum cooling capacity and engine performance and of course,
killer looks. With intercooler core dimensions of 9.375" x 33.5" x
3.25" for a surface area of over 314 square inches and a total intercooler
core volume of 1,020 cubic inches.
The APS intercooler core is of internally finned construction and offers significantly
enhanced flow and heat exchange performance over the standard intercooler and
other front mount intercooler systems, particularly at high charge air mass
flow rates. Also, unlike other manufacturers of WRX intercoolers who reduce
cost by using deeper cores of small frontal area, the APS D/R Series intercooler
is designed with the optimum ratio of intercooler core surface area (over 314
square inches!) to intercooler volume (1,1020 cubic inches). The result is
an intercooler system with outstanding flow and cooling performance, particularly
at high engine horsepower levels.
However, there is more to intercooling than size alone. Fully engineered light
weight, cast aluminum end tanks ensure optimum charge air distribution throughout
the entire cooling core for maximum charge air cooling and minimum pressure
The reality of intercooler excellence in terms of performance equals:
Largest intercooler surface area possible
Optimal intercooler internal passage volume
Lowest possible pressure drop
Highest possible intercooler core efficiency
Matched to the turbocharger air delivery in lb/min
In other words the greatest possible charge air temperature reduction with
the lowest possible pressure loss at the rated flow of the turbocharger - Whilst
maintaining good throttle response.
An intercooler drops the charge air temperature, which enhances the combustion
of the air/fuel mixtures. This more complete combustion of air fuel mixtures
produces higher engine power.
Intercooler performance is measured by the amount of energy (temperature)
the intercooler can remove from the inlet charge air as well as the pressure
drop across the entire system. It is important to consider the entire intercooler
system and not simply the intercooler core itself.
Pressure and Temperature Data
The following table details pressure and temperature reduction data at various
horsepower levels. Note that turbocharger specification will have a significant
affect on temperature and pressure data.
Turbochargers with a smaller capacity compressor for example will discharge
compressed air at a higher temperature. This results in increased charge air
volume (hence gas speed) through the intercooler system to achieve an equivalent
mass flow of compressed air. After all, the mass of air available for combustion
is the overriding factor when it comes to producing power from an internal
combustion engine. Conversely, a larger turbocharger will supply cooler air
for the equivalent mass flow of compressed air.
Never before has such an outstanding production intercooler system been made
available for the WRX/STI performance enthusiast. For high horsepower applications
up to 525 Flywheel horsepower, the APS DR525 is the clear choice.