Volkswagen's Jetta has been redesigned for 2019. The latest generation is a solid option in the compact sedan. It's also a perfect blank canvas for mad modders, as the car's MQB platform has been engineered for plenty of poke and has a lot of aftermarket parts out there. VW will use this week's SEMA show in Las Vegas to give us a taste of what's possible with 2019 Jetta-based builds from VW enthusiast Jamie Orr, as well as H&R Special Springs and Air Design USA. Orr's Jetta is an S model equipped with a six-speed manual transmission and lowered on KW Clubsport coil-overs that feature remote reservoirs and three-way adjustable damping. The aggressive stance of the vehicle is aided by an ECS Tuning body kit and a set of 20-inch wheels wrapped in Delinte DS8 tires. The car is stopped by ECS Tuning brake rotors with Brembo calipers up front and Volkswagen Golf R calipers at the rear. Aftermarket suspension specialist H&R Special Springs chose a Jetta R-Line which comes with an aggressive look straight from the factory. However, extra aggression comes from an Air Design USA body kit and 19-inch wheels wrapped with Pirelli P Zero tires.
Inside each wheel is an upgraded brake system with calipers color-matched to the Habanero Orange factory paint finish of the exterior. Air Design USA was also tasked with developing its own custom Jetta, in this case an SEL. The Oceanside, California tuner has given its Jetta a retro look, having taken inspiration from VW builds of the 1980s and early '90s. The car features one of Air Design USA's own body kits, along with 19-inch wheels, lowered suspension from Eibach, and official VW roof racks. All 2019 Jettas come standard with a 1.4-liter turbocharged inline-4 rated at 147 horsepower and 184 pound-feet of torque. While this isn't much to get excited about, VW will have a Jetta for performance fans next year when it introduces a new GLI. The car is expected to bring 210 or more hp. The SEMA show kicks off Tuesday. For more coverage, head to our dedicated hub.
MR fluid is suspension fluid, which is prepared by small magnetic particles (microlevel) dispersing in insulated carrier fluid, and shows specific noncolloid nature MR characteristic as the external magnetic field varies. MR fluid is the material related to the external magnetic field and shows the nature of common fluid in the absence of magnetic field. MR fluid and transmission performance. Nagaya et al. and Erol et al. The material performance of MR fluid is highly influenced by the temperature and also limits the application in phase type engineering. Therefore, the analysis of the temperature distribution condition of MR fluid and the variation of the material performance under different service states is of a great significance. Temperature highly influences the viscosity of MR fluid, and the viscosity influences the shear stress, and, as a result, the transmission performance of MR fluid is influenced. Therefore, the viscosity-temperature characteristics of MR fluid must be carried to obtain the influence rules of temperature on the viscosity of MR fluid.
Therefore, the influence of temperature on the performance of MR fluid is expressed through the influences on the carrier fluid and additive. According to the molecules, liquid is composed of a large number of random-motion molecules, and its viscidity performance is closely related to the molecule state. The viscosity of liquid is the comprehensive manifestation of intermolecular attraction and momentum transfer; the intermolecular attraction will sharply decline as the space between molecules rises, and the molecular momentum depends on the velocity of movement. There is small space between liquid molecules, and the average velocity of random motion is low, so intermolecular force mainly determines the viscidity performance. Once temperature rises, the average velocity of MR fluid molecular motion rises, and the space between molecules also rises. Therefore, the viscosity of liquid decreases as temperature rises. It is very important to understand the relation between viscosity of MR fluid and temperature during analyzing the influence of temperature on MR fluid. International and domestic academics have made a large number of studies on the viscosity and temperature characteristics of synthetic oil. Reynolds, Andrade-Erying, Slotte, Vogel, and Walther-ASTM et al.
