torque converter slip actual vs desired

Also, as we explained in the sidebar of our article on GMs other early automatic transmissions, torque converters utilize the speed difference between the driving and driven torus members to multiply engine torque. 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The wire chaffing is a definite possibility. (For each of these cookies, "xx" will be a cryptographic hash.) If the solenoid is not regulating the fluid flow properly, it could cause variability in the torque converter clutch performance as well. To serve up a little enlightenment, let's take a spin through the torque-converter world and make some sense out of all the superstition. In Drive, the direct clutch is engaged and both bands are released, causing the input sun gear, the low sun gear (orange), the planet carrier and output shaft (light green) to turn at input shaft speed. Being a fluid coupler, your car's torque converter relies on transmission fluid to operate correctly. Since taking all the of the steps outlined above, I can confirm that the transmission has been running properly and the clutch working as expected. I think you should check the fluid level first and foremost. Your car shudders almost as if it's caught the flu and has a temperature. If this is your first visit, be sure to check out the FAQ by clicking the link above. if I'm seeing "desired TC slip" of 1020rpm at all times wouldnt that pretty much guarantee the TC would never lock? What to Do to Fix Slipping or Shuddering. A torque converter clutch (TCC) is an important element of automatic transmissions because it affects fuel economy and driveability. So, you can see how those would be preferred from a standpoint of cost and packaging! We arent saying 10RPM of slip is bad, what we are saying is that seems to be the progression point of going out. In the early Studebaker Automatic Drive (Borg-Warner DG) transmission, the flywheel drives the torque converter impeller, front pump, and lockup clutch pressure plate (red). The result will be every car will have efficient, smooth, and comfortable rides. The car has just under 77k miles. That isnt true of a fluid clutch, whose torus members are free to rotate at different speeds. For a better experience, please enable JavaScript in your browser before proceeding. 6 speed/8 speed RWD/FWD Transmission Tuning (incl T43, T76, T87) T43 Torque Converter Desired Slip. (author diagram). T43 Torque Converter Desired Slip - EFILive by SirHandyMan Fri Mar 29, 2019 8:27 pm, Post When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Okay, so it sounds like you were able to identify a potential root cause. Your email address will not be published. (For this cookie, "xx" will be a cryptographic hash.) 7.3L Power Stroke - Aftermarket & Performance. If the payment button is visible, it may set the third-party cookies PYPF (via paypalobjects.com, which is owned by PayPal, Inc.), which appears to check whether or not you are a logged-in PayPal user, possibly to facilitate the PayPal user login process, and/or 01A1 (via abmr.net, which is owned by Akamai Technologies), which stores certain technical information about your device and browser (or other user agent), possibly to facilitate the login and shopping cart functions. Big cars weighing over 3,300 pounds generally need a converter with more torque multiplication. Plugging it back in all the way and resetting the PCM took care of that problem. For a drag-race car, the cost of this additional slippage is worth the price, but for a street car it creates other problems. Hence, you've commanded your torque converter every time your car shifted gears. In this schematic of a basic three-element torque converter with lockup clutch, the torus cover, lockup clutch pressure plate, and impeller (red) all rotate with the engine flywheel. Heat is the enemy of any automatic transmission and will radically reduce its life span if not mediated by an efficient trans cooler. They normally expire in just under one year, but you can delete the cookies in your browser (or other user agent) at any time. To learn more about the specific cookies used and/or to fine-tune your available choices, click "Privacy Preferences" at the right. Keep reading to find out these common torque converter problems and how to fix them. Overdrive ratios drive the torque converter at speeds generally below normal coupling speed, creating increased slippage and heat, which is unacceptable. If your car transmission keeps overheating, you may also notice your transmission starts to act funny, or it may even go into fail date and stay in one gear and not shift at all. The turbine has a spline that attaches to the transmission input shaft, which connects to the internal parts of the transmission to shift gears and provide power to the wheels. (Both turbines, here colored medium blue, were bolted together into a single unit, but had different blade profiles.) A third drum (dark green) allows the overrunning clutchs outer race to be locked in place by the forward band, which is engaged in all forward gears. In a car with a good suspension and sticky tires, you can use extra rpm to put the engine closer to its torque peak, launching the car even more quickly. Fluid clutches also dont allow much engine braking. With the clutch engaged, Ultramatic also transmitted some drivetrain vibration that the torque converter would otherwise have absorbed. The impeller pump receives the transmission fluid once it's delivered. Privacy Statement - It's also important not to undersell converter weight as a contributing factor to maximizing acceleration. After logging in, the wp-settings-UID cookies store the logged-in user's configuration settings, while the wp-settings-time-UID cookies record the time those configuration settings were last set; again, there may be multiple iterations of each of these cookies, which normally expire after about one year. However, even at coupling stage, the turbine still turns somewhat slower than the impeller. But Ive never heard of anyone going that route. So far the bogging down hasn't happened since last week. In this diagram, the yellow arrows show the power flow in second gear. A multi-disc clutch can lock that carrier to the front sun gear, which is also attached to the rear brake drum (dark red). Torque converter slip question I was monitoring some Torque converter params for my 4R55E with my in dash scantool. but my truck has 25k on it and 10k tuned.. so im thinking mines not on the way out and its got 20rpm slip. I was towing my 5th wheel and the temp went up to 285. Think of it as two fans facing eachother inside an enclosure. These early units operated on the same principal of using one electric fan to drive another. 51.91.16.67 This setting is stored in your browser (or other user agent) in the gdpr[consent_types] cookie described in "Privacy and Cookie Preferences" above, so if you delete that cookie or access the Ate Up With Motor website from a different device, browser, or user agent, you will need to adjust this setting again if you still wish to hide the box. The slipping occurs while you're driving or changing gears, and it usually comes with some odd noises too. The turbine drives the front annulus through the input shaft (medium blue). With automated hydraulic operation and combinations of brakes and clutches, it was possible to get the same results more efficiently. Do Not Sell or Share My Personal Information. Torque converter seals can get damaged for several reasons. Most street torque. The knock sensor wire harness connector was loose. You also need to move forward with viable options that will help you get your torque converter fixed. Contact Us - All engine power flows through the mechanical clutch directly to the input shaft. A converter that might have a stall speed of 5,000 rpm for a pure drag car would be completely miserable on the street. Many times, people think there is something wrong with their transmission when the problem lies with their torque converter. The torque converter is so essential to the global car market theres a global torque converter market. When starting, the fluid clutchs driving torus (the impeller) may reach a speed of 2,000 rpm or more before the driven torus (the turbine) begins to move at all, a point known as stall. So when the torque converter clutch engages there should be almost 0rpm difference between tc slip desired and tc slip act. Even though Dyno numbers are just a number, For reference my 2018 Gen3 made 400rwhp/390rwtq stock with 5k miles on a Dynojet,, It hit the speed limiter at 6700. Ive been troubleshooting a low RPM with light acceleration shudder on my 2011 EcoBoost Flex. and our About Us - As youll see if you look at the first one, the original iteration had three speeds forward and one reverse, for which it requires four epicyclic gearsets. They normally expire after about one year. (Until late 1954, the transmissions planetary gearset always remain in direct drive unless the driver manually selected Low.) 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