Port and polish head kit manual#
Port and polish head kit software#

Port and polish head kit software#

You must own an APR Stage III or Stage III GTX Turbocharger System to qualify for the free software upgrade. APR Stage III+īy purchasing an APR Stage III+ Cylinder Head, your existing APR Stage III Turbocharger System’s software will be upgraded to APR Stage III+ Software, free of charge. The advantages of oversized ports are not realized until well over the 500 HP mark, which extends beyond other limitations in the system. As mentioned earlier, the bottlenecks are located one at a time and between a ported head and oversized valve ported head, the restriction once again becomes the turbocharger system. Despite offering a significant improvement in airflow on the flow bench, there were no performance advantages from the engine. The ultimate goal and end result was developing shape, volume and profile for each port that results in the highest flow yet the least decrease in velocity over stock.ĪPR’s Engineering Teams took development a step further though testing of 1mm oversized valves on both the intake and exhaust. CNC porting allows for precise profiling unachievable through hand porting and makes compensations necessary to account for core shift. This is not a mistake, as increasing the port size slightly larger to ensure all surfaces are machined proves less than ideal. As such, some ports may retain parts of their original casting, unmachined. Through testing on our Superflow Flow Bench, we also discovered many different sizes and shapes would show no benefit in flow but would result in decreased velocity. Largest Gain over Stock Head (FT-LBS RPM)

The goal was simple a bolt on hardware solution with matching software, to integrate seamlessly into APR’s existing product line.

Port and polish head kit manual#

With the need to provide the most consistent and technologically advanced head porting solution, APR tested and quickly looked beyond manual head porting – each system is CNC machined to ensure strict repeatability. Includes APR Stage III+ Software for Existing Customersįive years prior to release, APR’s engineers began research and development on high flow cylinder heads.+70 HP on 93 (R+M)/2 Fuel over Stage III.CNC Ported for Precision and Repeatability.Through specific Stage III+ calibration changes, this directly translates to a +70 HP gain over APR’s existing BPY, AXX and BWA Stage III Turbocharger System on 93 (R+M)/2 octane fuel and up to +126 HP on race fuel! As a result, the spark knock threshold is extended up to 7 degrees allowing for a substantial increase in power. The engine’s boost-to-airflow ratio is reduced by roughly 10% while also reducing intake air temperature and alleviating backpressure. APR is pleased to present the Stage 3+ High-Flow, CNC-Ported, Performance Cylinder Head for the 2.0T FSI (EA113) Engine.ĪPR's engineers have optimized the FSI head with proprietary, computer-controlled porting conducted on APR’s in-house 5-Axis Centroid CNC machine, our engineers have increased airflow by 17% on the intake ports and an additional 12% on the exhaust ports.