APR Turbocharger Inlet System for Audi 2.5 TFSI EVO
Le système d'admission du turbocompresseur APR utilise un énorme tube d'admission en fibre de carbone de 4 pouces qui se fixe à la boîte à air d'origine ou au système de filtre d'admission APR. Attaché au tube en fibre de carbone se trouve une énorme entrée en aluminium moulé de 4 pouces, dont la forme organique permet de conserver la plus grande surface de section transversale possible à l'intérieur du tuyau jusqu'à l'entrée du couvercle du compresseur du turbocompresseur. Malgré sa forme visuellement étrange, le maintien de la surface de section transversale aussi grande que possible est la clé des gains de performance du tuyau, et dépasse largement les designs lisses et continuellement effilés en termes de débit.
Les bagues d'adaptateur à verrouillage forment une entrée idéale correspondant au port du turbocompresseur, tandis que les bagues plus grandes (vendues séparément) offrent un support correspondant au port pour des mises à niveau de turbocompresseur hybride encore plus grandes. Un épais bouclier thermique en acier inoxydable protège le tuyau du collecteur de turbocompresseur chaud, et un tuyau PCV externe en acier inoxydable assure un positionnement approprié du PCV sans affecter la conception de l'entrée.
Enfin, l'ajout du filtre d'admission APR en option transforme complètement le système, passant du subtil à l'extrême. Notre énorme filtre en coton de 9 pouces de long avec une ouverture frontale se connecte à un tube d'admission en fibre de carbone de 6 pouces qui se rétrécit progressivement jusqu'au tube arrière de 4 pouces. Vous entendrez chaque once de la demande massive de flux d'air du système de suralimentation à 5 cylindres, et ce, avec une amélioration de 60% du débit d'air par rapport à l'origine ! Cela n'était possible qu'avec un système de filtre ouvert, car les exigences de débit d'air nécessitaient une conception sans boîtier. En un mot, il s'agit du meilleur système d'admission sur le marché pour satisfaire des exigences de débit d'air exigeantes sans compromis.
APR Turbo Inlet System with APR Intake Filter System
APR Turbo Inlet System
The Inlet Restriction
The factory cast inlet pipe is small. It has a maximum internal diameter of 2.8”, at the widest point, and is internally restricted as illustrated in the photos. This pipe is only capable of achieving a maximum of 490 CFM at 28” of H2O when tested alone. Attaching any intake system to this pipe will only result in a lower flow rate, and when using the factory back pipe, airbox, filter and inlet scoop, airflow drops below 430 CFM.
The APR Solution
Our cast inlet pipe is huge and on its own it achieves a staggering 710 CFM with the stock turbocharger adaptor! This is a 45% improvement over the factory part. When paired with the APR Intake Filter System, airflow only drops to 690 CFM, a 60% improvement over the entire stock intake system! When attached to the factory airbox, filter and frontal scoop, airflow drops to 575 CFM, which is 34% better than the stock system and 17% better than the stock inlet by itself with an ideal entrance. This further clarifies the point that no intake can outperform the APR turbo inlet if the factory turbo inlet is left intact.
APR’s engineers tested a multitude of other turbocharger inlet designs in pursuit of more flow and power. It was quickly determined the part could not act as an upgrade on its own because of the significant increase in diameter required. The rear inlet pipe also had to be upgraded to utilize this larger diameter. Other designs, which may look smoother, and offer a continuously reducing taper, are extremely limited. At 3.5”, 550 CFM is achievable. At 4” 560 is achievable. In contrast, our system achieves 710 CFM under the same test. Given how restrictive these other designs are, upgrading to our system, while still using the factory airbox, filter and frontal scoop, will outflow any intake system!
Dyno Testing
The APR Inlet System greatly outflows the factory inlet system, and for this reason, APR’s engineers have created a Stage 1+ ECU to take full advantage of the upgrade. While Stage 1+ is designed for use with an intercooler system, we tested the upgrade with the factory intercooler system to illustrate the gain from the inlet alone. In doing so, the APR Inlet system gained as much as 14 WHP and 11 WFT-LBS of Torque! When adding the APR Intake Filter to this setup, gains grow even further towards redline, adding up to a gain of 32 WHP and 24 WFT-LBS of Torque! When the inlet alone is combined with the APR Intercooler system gains grew further to 37 WHP and 29 WFT-LBS. Gains will continue to grow as higher demands are put on the system via higher stages of performance.
APR Turbocharger Inlet System Photos
The kit includes the stock turbo adapter ring. Other adapter rings are sold separately.
APR Intake Filter System
Further Data
APR’s Engineers fully instrumented the engine with pressure sensors and thermocouples (fast response temperature sensors) to further illustrate the affects this product has on the system as a whole. In the simplest terms, this upgrade allows the turbocharger to operate at a lower pressure ratio, which means it will operate more efficiently. It reduces the restriction on the inlet of the turbocharger, allowing the inlet to see closer to ambient pressure conditions. This directly translates to lower pre-turbine backpressure (EMAP), lower turbocharger shaft speed, lower turbocharger compressor discharge temperature, and for the ability to achieve higher boost pressure levels.
The following data was collected with ambient conditions sitting around 985 mbar, 29.4C with 66% relative humidity. The vehicle was setup as Stage 1 (93) with stock hardware, vs Stage 1+ (93) with the APR Inlet. The depression at the inlet decreased by 112 mbar, emap decreased 360 mbar, compressor discharge temperature dropped 14c and the engine was able to achieve 106 mbar more boost pressure by redline. This directly translated to more horsepower and torque, while everything ran cooler and more efficiently.