torque converter slip actual vs desired

This slippage is part of what determines the stall speed of the converter. That isnt true of a fluid clutch, whose torus members are free to rotate at different speeds. Privacy Policy. (not Diameter) Torque converter seals can get damaged for several reasons. Torque converter slip question - Ford Truck Enthusiasts Forums scheme, but it does contribute. Input output shaft readings are almost exactly the same when driving. Twice last week, when I came up to a stop light, the engine bogged down to 400rpm then recovered back to normal idle. if you dont hammer on it everyday it will last you a long time.. my stock converter had 350 rpms of slip on Once the clutch plate is fully engaged against the pressure plate, both must turn together at the same speed. Failing Torque Converter Clutch with Slippage - Could be your TCC Solenoid, Re: Failing Torque Converter Clutch with Slippage - Could be your TCC Solenoid, https://www.ecoboostperformanceforum.co 733.0.html. Torque converters can be serviced or replaced as a single unit. if I'm seeing "desired TC slip" of 1020rpm at all times wouldnt that pretty much guarantee the TC would never lock? Comments may be moderated. I don't think they had this in 2011 however. 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By changing the angle of the impeller blades, the torque-converter manufacturer can create a converter that generates a given stall speed with a certain torque multiplication. (author diagram). It will also integrate that knowledge with what type of car and transmission consumers are buying. One thing Ive always wondered about was if any manufacturers looked into Wilson pre-selector gearboxes as a basis of an automatic. (Vimeo and the Vimeo logos are trademarks of Vimeo.com, Inc., registered in the U.S. and other countries. I changed the transmission fluid (Mercon LV) at 63k miles back in 2017. one of the strange quirks of these transmissions is if they are a quart or so low it will feel like the torque converter does not disengage at stop. Its free and only takes a minute, Powered by phpBB Forum Software phpBB Limited. For a drag-race car, the cost of this additional slippage is worth the price, but for a street car it creates other problems. Well done and thank you; this must have been an enormous amount of work. Hydraulic slippage also offers some advantages during acceleration: As with a plate clutch, a certain amount of slip makes for a much smoother takeoff. I switched from a junk converter slipping that much to a tight well built version and picked up .3 and 4mph behind a healthy smallblock (10.2's at 127mph) Torque Converter Slip Measurement / Diagnosis | Ford Explorer - Ford Thanks for copying the information from my other post here. Basically, the fluid exits the center of the turbine and is redirected by the stator back into the impeller. Petrol / Gas. If you change certain aspects of the site's appearance using the accessibility sidebar, it may set these cookies to manage and remember your settings. Since the 1940s, automakers have come up with a variety of strategies for reducing or eliminating that slip, including series parallel split torque transmissions and different types of converter lockup clutches. With automated hydraulic operation and combinations of brakes and clutches, it was possible to get the same results more efficiently. One is turned by the enginge. At idle and very low road speeds, slippage is desirable because it keeps the engine from stalling or lugging in gear. (author diagram). The fluid did not look dirty. Members can start their own topics & subscribe to topics I think you probably have some time as long as you dont pound on it. The trans temp was never above 160 degrees. The slipping occurs while you're driving or changing gears, and it usually comes with some odd noises too. When you experience fluid leaks, you aren't retaining the amount of transmission fluid; the torque converter needs to transfer the power from the engine to the transmission. The knock sensor wire harness connector was loose. by SirHandyMan Fri Mar 29, 2019 3:24 pm, Post You are using an out of date browser. The second thing to look for is a lot of slippage between Desired and Actual readings for the TCC in Forscan. There will typically be several such cookies, each beginning with "gdpr" (e.g., gdpr[allowed_cookies], gdpr&5Bprivacy_bar&5D, and gdpr[consent_types]). works great no real problems. (WordPress and the WordPress logos are registered trademarks of the WordPress Foundation in the United States and other countries. 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There was also a kickdown mechanism that allowed the driver to disengage the clutch at road speeds between 13 and 56 mph (21 and 90 km/h) by flooring the accelerator, allowing the torque converter to again multiply torque. The replacement was a cheaper and somewhat simpler Borg-Warner unit which Studebaker-Packard called Flightomatic that deleted the DGs lockup clutch. The car has just under 77k miles. The transmission fluid is an important part of the torque converter in that it is used to provide the fluid coupling and smooth starts and without stalling the engine when the vehicle is stopped in gear. One of the fundamental differences between a fluid clutch (a fluid coupling or torque converter) and a mechanical plate clutch is slippage. Torque converter problems have a high impact on your car's ability to function and drive. I cant imagine the hours of work which you must have put into understanding these various transmissions, to say nothing of writing up a description that a simpleton like me could (mostly) understand. The information below will outline the most common torque converter issues and their solutions. Reddit and its partners use cookies and similar technologies to provide you with a better experience. As these vehicles age, diagnosing these issues can become more challenging. Transmission Range) start a datalog or have an assistant drive and watch Torque Converter Slip Actual (TCA) and Torque Converter Slip Desired (TCD). To learn more about what information the Vimeo platform collects and how that information may be used, see the Vimeo Privacy Policy. (Until late 1954, the transmissions planetary gearset always remain in direct drive unless the driver manually selected Low.) With no slip at all. The stock converter wouldn't with a big tune unless I was cruising at light throttle. In the Packard Ultramatic transmission, the input shaft drives the hub of the direct drive clutch and the input sun gear of the Ravigneaux gearset (all colored medium blue). A tracking pixel, sometimes known as a web beacon, is a tiny image file that loads from a remote server; it's a type of embedded content (as is the button itself, which loads from the same domain). I believe it is labeled as TQSLIP(rpm) under Ford Specific PID's. If your going over ten your gonna need a new torque converter fairly soon..depends how you drive.. my converter started off slipping at about 13 on the 275 and ended up wearing out pretty quick and it began slipping like 45-50 on the gauge. I wouldn't worry about it, but I'm not familiar with your specific transmission. Contact Us - Think of it this way, a well built converter, 10" may slip 4-5%, if yours slips 6-7% higher, you are baking the fluid, cooking the band, and compromising the clutches, and giving up mph and ET. When I replaced my transmission and converter, I replaced two mounts and the two dog bones under the engine. But the catch is that this torque multiplication doesn't last very long. The vehicle suffered a torque converter failure at around 140k miles. Datalogging converter lockup question | SVTPerformance.com I was monitoring some Torque converter params for my 4R55E with my in dash scantool. At some point Ford modified the wiring to include a thick rubber insulator on the wires that extended beyond the edge of the intake manifold to prevent the chaffing. Generally, by the time you reach the 60-foot mark on the dragstrip, torque multiplication is effectively eliminated and the turbine and impeller speeds are close to achieving what converter manufacturers call coupling speed.

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