torque converter slip actual vs desired

If the fluid becomes contaminated, anything that uses and relies on the fluid can be damaged. 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. The combination of a smaller-diameter and lighter converter means that less engine torque is required for acceleration. However, that clutch was used in a distinctly different way than was Packards. In addition, all page headers, custom graphics, button icons, and scripts related to the PayPal services are service marks, trademarks, and/or trade dress of PayPal. The wahFontColor and wahBgColor cookies, which are set if you alter the site's color scheme, normally expire after about 14 days, but you can remove them immediately by clicking the "Restore Defaults" button on the sidebar. I changed to the Spartan V2 a few weeks ago. The PYPF cookie normally expires in approximately four weeks, the 01A1 cookie in approximately one year. I was monitoring some Torque converter params for my 4R55E with my in dash scantool. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Wilson pre-selectors were pretty well established technology, although not common, by the late 30s. (author diagram). This is not an official website of any automaker or automotive brand! Thanks for copying the information from my other post here. They may persist for up to two years. Signs of a Failing Torque Converter [and How to Fix it!] (At present, this setting does NOT affect the payment or donation buttons that may appear on portions of the site's administrative dashboard, nor does hiding the box affect any cookies that may have already been set). Since the transmission was largely dependent on the torque converter for torque multiplication, it was crucial that the lockup clutch not engage prematurely and that there be some means to immediately disengage it for acceleration. Adding stall speed to the torque converter increases the power available to accelerate the car more quickly. Your email address will not be published. I checked for codes and had none that explained why it happened. Your email address will not be published. Stall speed is measured in the car by applying the brakes and revving the engine in First gear against the brakes. It will read really high numbers until the converter is locked. Tuning. These cookies expire in about 15 days if the user clicks "Remember Me" when logging in; if not, the cookies normally expire when the user closes their browser (or other user agent), or, failing that, within about two days. The good news is, if it is just your torque converter that is having issues since it's a self-contained unit, you may not need to replace or rebuild your whole transmission. How exactly are you measuring how much the tc is slipping? U.S. Pat. if I'm seeing "desired TC slip" of 1020rpm at all times wouldnt that pretty much guarantee the TC would never lock? VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. With Torque Pro torque slip shows it at 0-6 rpm at 60 mph and when coming to a stop it jumps to 25-40 rpm then raises to 1400+. Comments may be moderated. mroberthowell 4 yr. ago Thank you so much! For more information, please see our copyright 2023 AAMCO transmissions inc. Torque Converters - Unlocking The Secrets - Car Craft Magazine - MotorTrend 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. (These cookies may not be set at all for administrative users unless they access the publicly visible portions of the website and/or update their consent settings e.g., by accepting an updated version of the Privacy Policy. Wallace Racing - Converter Slip Calculator As you can see I was experiencing multiple issues, all of which were exacerbating the clutch slippage and/or shuddering issue. It was followed in fairly short order by the 1950 Studebaker Automatic Drive, which took a somewhat different approach to the same problem. When the vehicle is at rest, the fluid clutch slips enough to allow the engine to idle with the transmission in gear without stalling. Your ring and pinion (gear size) Your circumference or roll out of the rear tires. My SunCoast converter has a little slip. Sep 16, 2013 #11 4 The drive fan moves air across the blades of the driven fan (which is turned off). In fact, Cadillacs chief engineer ordered an early Daimler Double Six with the Wilson and Laurence Pomeroys Fluid Flywheel for evaluation purposes. JavaScript is disabled. Currently the vehicle is much better to drive. *. Your first course of action, if you notice yourtransmission or torque converter has started to slip or shudder is checking your fluid level. RPM. Turbine Input Speed Sensor. - Ford Powerstroke Diesel Forum abs, do you have any recommendations on how to troubleshoot a failing torque converter using ForScan? Performance & security by Cloudflare. ), These cookies were previously used by the Google Analytics service to collect information about visitors and their use of the Ate Up With Motor website. Actual shows 640 rpm in drive with the brake on. The one for torque slip desired is 1020 rpm. Those gear ratios were in addition to the torque multiplication provided by the torque converter. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. I have read and accepted the Privacy Policy Achieving a true 1:1 speed relationship between the turbine and the impeller is not possible with a non-lockup torque converter since it is still a fluid coupling. But now with the Spartan 275 I am seeing 18.24 at WOT with the converter locked. However, Wilson gearboxes were quite bulky and complex because the nature of their operation required a separate set of epicyclic gears for each ratio, including reverse. They normally expire in just under one year, but you can delete the cookies in your browser (or other user agent) at any time. (These cookies are not usually set for administrative users, since comments they submit while logged in are associated with their user ID number and user profile information rather than a manually entered name and email address.). Advertising - The torque converter is made up of five parts: 1. * Various services, specials, or coupon offers are available at participating locations only. The car became basically undriveable. It's not more specific because stall speed is highly dependent upon engine torque. Only lasts from .5 seconds to 2 seconds. Last fall, the external filter disintegrated and clogged up the cooler. On some prewar bus and rail car transmissions with lockup torque converters, the lockup clutch was engaged manually, but automotive lockup clutches are designed to engage and disengage automatically. That isnt true of a fluid clutch, whose torus members are free to rotate at different speeds. Many of the other listed cookies are associated with the Google Analytics service, the Google AdSense advertising service, and/or other Google advertising and measurement products, which are subject to the Google Privacy Policy; see their "How Google uses information from sites or apps that use our services" page, the "Information for Visitors of Sites and Apps Using Google Analytics" section of the Google Analytics "Safeguarding your data" help page, the "Technologies" section of their Google Privacy & Terms site, and the "Our advertising and measurement cookies" section of the Google Business Data Responsibility site (which includes a detailed list of cookies associated with Google advertising and measurement products) for more information. Cookies whose names begin with "optimizely" are associated with the Optimizely digital experience platform (which is subject to the Optimizely Privacy Policy; the "Privacy" section of the Optimizely Trust Center provides additional information about Optimizely privacy practices, including a link to the Data Processing Agreement that applies to personal data the Optimizely services process on customers' behalf that may be subject to certain regional privacy and/or data protection laws, while their "Cookies and localStorage in the Optimizely snippet" help page provides additional technical information about the cookies and/or similar technologies used by that platform). Over 10 RPM is real slip. Clutch material, bearing and bushing pieces, and a shiny metal flake appearance will be an indicator that things are coming apart inside. Unless you have tune that keeps the converter unlocked, the converter should've locked. Petrol / Gas. The iThemes Security plugin may also set the itsec-hb-login-xx cookie, which helps to protect the site against "brute force" hacking attempts; that cookie normally expires in about one hour. 91.234.33.200 Think of a lock TC as the clutches in your tranny. The mount on the transmission side (under the battery) was severely damaged, the rubber legs inside the bushing were torn through and was allowing a lot of engine movement. As an example, replace your spark plugs if they are original, replace air filter, replace PCV valve. The impeller pump receives the transmission fluid once it's delivered. To avoid stalling or lugging the engine, the clutch would automatically disengage if road speed fell below 13 mph (21 km/h). check trans fluid. (author diagram). JavaScript is disabled. Filling the cylinder with pressurized oil would lock the pressure plate to the clutch plate itself, forcing the clutch and input shaft to rotate with the torus cover at engine speed. Once the vehicle is moving at a constant speed, the speed difference between the impeller and turbine diminishes, eventually reaching a minimum point known as coupling stage. iThemes is one of the Liquid Web family of brands; iThemes and Liquid Web are trademarks of Liquid Web, LLC.). Just thought I would share with everyone some recent learnings I've had with my 2010 EB Flex. All engine power flows through the mechanical clutch directly to the input shaft. (not Diameter) A spring-loaded plunger valve controlled oil flow to the lockup clutchs hydraulic cylinder. A lot of bad things can happen to your car when the torque converter starts failing. Torque converter clutch slip Scan tool values 99 GMC Pickup GM's 6L80 HP Tuning, DoD, and Torque Converters! However, that did not cure the shuddering problem. Submitting a comment signifies your acceptance of our Comment Policy please read it first! AAMCO Centers are independently owned and operated. the only readings i got was for all the electronically controlled aod. To resolve the issue, I have reduce the desired slip to 10 rpm in 3-6th gear and increased the + side of the apply ramp table by about 10% across the board and up to 30% in the slip rpm of 2-12. There is going to be some slip. 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. To fix the problem, you need to discover the seal that's damaged and have it replaced. This is most noticeable from about 1200-1800 rpm. The faster it spins, the more force it provides, which causes the fluid to flow faster and harder. The cookieconsent_status cookie recorded whether or not you consented to analytics tracking and told the website to hide the notification banner; this cookie normally expires after about one year. 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. It will also integrate that knowledge with what type of car and transmission consumers are buying. Your car's automatic transmission has a torque converter. When I replaced my transmission and converter, I replaced two mounts and the two dog bones under the engine.

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