![]() ![]() If you are exiting the turn with a high g-force, the transmission will delay the upshift. As an example, if you are decelerating and braking hard into a turn, the transmission will downshift early as you enter the turn. Many different inputs such as g-force and brake pressure are used to decide when the transmission should upshift and downshift so the transmission can do some things that may surprise you. For example, if you are in 7th gear and you aggressively accelerate, the computer can shift the transmission from 7th to 4th, skipping 5th and 6th gear. On a forced downshift, the system can skip shifts. To make the change to second gear, the system releases the odd clutch and applies the even clutch to provide power flow thru the unit. For example, when operating in first gear, the transmission positions the shift system into second gear. Like other DCT transmissions, the TR9080 stages the shifts and simply swaps clutches when changing from and odd to even or even to odd gear. Normal operational capacity is 11.6 qt (11L), but if the car is used for racing, capacity should be raised to 13.7 qt (13 L). The fluid change interval is 45,000 miles (72,000 km), while the filter is designed to be serviced at 7,500 miles (12,070 km), then at 22,500 miles (36,000 km), and at 22,500 miles (36,000 km) intervals from that point forward. The fluid for the TR9080 is Pentosin FFL-4, a fully synthetic product produced by Fuchs and sold by AC Delco (Figure 3). It operates very similar to the pendulum dampener torque converter designs in use today, eliminating vibrations due to engine firing frequencies. In addition, the flywheel is equipped with a pendulum dampener. One shaft and clutch are in charge of the even gears (2-4-6-8), while the other controls the odd gears (1-3-5-7) (Figure 2). Like other DCT transmissions, the TR9080 utilizes two input shafts, each connected to a clutch. The electronic control systems consist of multiple valve/solenoid bodies, as well as sensors to support the unit’s operation. Making up the TR9080 are five aluminum component housings used to support multiple shafts, five synchronizer assemblies and shift rods, two multiple disc clutches, and a bunch of gears and bearings. Tremec purchased Hoerbiger Drivetrain Mechatronics, a Belgium-based company that is a supplier for Mercedes, Ferrari, and McLaren DCT components. Tremec produces both mechanical as well as mechatronic components. The TR9080 is an 8-speed wet-clutch DCT equipped with either a mechanical limited-slip differential (mLSD) or an electronic limited-slip differential (eLSD). The TR9080 is the cousin of the TR9070 used in the Ford Shelby Mustang. The TR9080 DCT is supplied to GM from Tremec, a many decades-long manual transmission supplier to GM, Ford, and Chrysler. To accomplish those goals, they equipped the vehicle with a 6.2L small-block V8 (RPO LT2) and an 8-speed DCT transmission (RPO M1L) (Figure 1). Sixty plus years later, GM introduced the 2020 mid-engine Corvette.Ĭhief engineer on the C8 Corvette, Tadge Juechter, wanted a car that would get 30 mpg, go 0 to 60 in 3 seconds, offer driving comfort for the operator and passenger and be base-priced around the 60K range. Zora Arkus-Duntov, the father of the Corvette, made a statement at the end of the 12 hours of Sebring in 1957 that the engine needed to be moved to a position behind the driver. There, a technician will inspect the transmission and replace it with a new one that is not impacted by the electric oil pump quality deviation where necessary, at no cost to the owner.Get in, buckle up and hold on is what a friend told me as we went for a drive in his 2021 Corvette. Owners will be reached out to by first-class mail starting on December 9 and asked to return their vehicle to the dealer. Fortunately, neither it nor Kia are aware of any crashes or injuries related to the defect. That will, ultimately, result in a loss of motive power, which could lead to an increased risk of a crash.Īs of September 26, 2022, Hyundai was aware of 229 unique incidents between June 2021 and that date. The car will play audible chimes and a message to “stop safely immediately” on the instrument cluster.Īnd the warning is legit, because drivers will be given just 20-30 seconds of normal driving before the transmission enters a failsafe mode and disengages the drive gears. The fault could result in a diagnostic trouble code, which would warn the driver of the impending issue. Specifically, a component within the pump’s circuit board may not have been soldered sufficiently, and could detach. The problem stems from the electric oil pump within the eight-speed dual clutch transmission, which may experience an internal fault due to a supplier quality deviation issue. ![]()
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