Clutch material, bearing and bushing pieces, and a shiny metal flake appearance will be an indicator that things are coming apart inside. 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. For most hot street engines, converters in the 2,200 to 2,600-rpm range are considered streetable but will still require a very efficient trans cooler to keep them out of the heat zone. Diagnosing a potential Torque Converter problem with a Scan tool. I was monitoring some Torque converter params for my 4R55E with my in dash scantool. This is a remarkably broad, convoluted, and idiosyncratic field and theres a LOT I dont know. Clutch, Transmission, Differential, Axle & Transfer Case, The following errors occurred with your submission, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. (Google, Google Analytics, and other related marks and logos are trademarks of Google LLC. This website is using a security service to protect itself from online attacks. To fix the problem, you need to discover the seal that's damaged and have it replaced. I wouldn't worry about it, but I'm not familiar with your specific transmission. 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. The effective dates of the current versions are: Paid advertisements and/or sponsored links on Ate Up With Motor will be identified with words such as "Sponsor," "Sponsors," "Sponsored Link(s)," "Sponsored Content," "Ad," "Advertisement," "Advertisement(s)," or "Paid Promotion" (and/or by images or icons containing such words). We thought 10 was bad 2 years ago. Transmission Range) start a datalog or have an assistant drive and watch Torque Converter Slip Actual (TCA) and Torque Converter Slip Desired (TCD). It stayed there(18.24) from 60mph to 90 when I let off of it. A malfunctioning torque converter can have a shudder that comes from the transmission. 4. One of the fundamental differences between a fluid clutch (a fluid coupling or torque converter) and a mechanical plate clutch is slippage. Stator The stator is called the middleman. ), These first-party cookies are used to manage user logins and certain other administrative functions of the WordPress content management system, e.g., post editing. The annulus (purple) is held in reverse, idles in low, and rotates with the sun gears in direct drive. But the most common torque converter problems are listed below. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. This is a session cookie that verifies that the user has entered valid user credentials pending receipt of the correct authentication code; the cookie normally expires when the user closes their browser (or other user agent). Some iterations of the Studebaker Automatic Drive/Borg-Warner DG started in first gear, but early transmissions started in second unless the driver manually selected Low. The wp-donottrack_feed cookie, which controls a blog feed, was set by accessing the dashboard menu for the WP DoNotTrack plugin (which we do not currently use on this website); this cookie normally expires in about one year. The torque converter is made up of five parts: The stator is called the middleman. (Google, DoubleClick, YouTube, and other related marks and logos are trademarks of Google LLC. I always thought it wasn't supposed to go over 10. As the new owner of a 92 Alante with the viscous clutch I wondered what the difference was. 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. Only lasts from .5 seconds to 2 seconds. 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. abs, do you have any recommendations on how to troubleshoot a failing torque converter using ForScan? However, such a lockup clutch cant remain locked all the time. Unlike a reduction gear, this speed reduction doesnt multiply engine torque. Akamai is a registered trademark or service mark of Akamai Technologies, Inc. in the United States (Reg. Reddit and its partners use cookies and similar technologies to provide you with a better experience. 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) I think you probably have some time as long as you dont pound on it. The torque converter is so essential to the global car market theres a global torque converter market. The _ga and _gid cookies, which were only placed if you clicked "Accept/Enable" in the notification banner, enabled the Google Analytics service to track your activity on the site. & Tm. there were around 6 defaults that popped up. Your IP: copyright 2023 AAMCO transmissions inc. by SirHandyMan Fri Mar 29, 2019 8:27 pm, Post The stator is called the middleman because it serves as the conduit that reverses transmission fluid and sends it back to a turbine impeller. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. How ever this did happen right after I did the six 0 to 60 mph relearn runs. 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. The slipping occurs while you're driving or changing gears, and it usually comes with some odd noises too. These cookies are necessary for the site's administrative users (who wouldn't even be able to log in without them), but if you are not an administrative user, these cookies aren't normally placed on your device at all unless you somehow access the login area, which is off-limits to non-administrators. If we have enabled multi-factor authentication (which requires an authentication code as well as a password to log into the administrative dashboard), the iThemes Security plugin may also set the itsec_interstitial_browser cookie during the login process. Think of it as two fans facing eachother inside an enclosure. Many times, people think there is something wrong with their transmission when the problem lies with their torque converter. This viscous connection is transmission fluid. For more information about what data PayPal services collect and how that data may be used, visit the "Legal Agreements for PayPal Services" page to review the PayPal Privacy Statement and Statement on Cookies and Tracking Technologies that apply in your location (the Statement on Cookies and Tracking Technologies that applies to each region is linked from within the applicable PayPal Privacy Statement). Ive been troubleshooting a low RPM with light acceleration shudder on my 2011 EcoBoost Flex. 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. Any reading below 10 RPM slip is really errors in reading the sensors, not real slip. Embedded video players for content hosted on the YouTube video platform (which is owned by Google LLC) may set these third-party cookies and/or use similar technologies to store data in your browser (or other user agent) for purposes such as (without limitation) managing video settings (e.g., tailoring the playback to your connection speed), storing video preferences, providing certain functionality (e.g., allowing you to pause a video at a particular point), showing you advertisements, associating your video viewing and other activity with your Google account (if any), ensuring proper functioning of the service, preventing abuse, and/or compiling user analytics data. This is why a disc clutch must be disengaged or the transmission shifted to neutral whenever the vehicle stops. Your email address will not be published. works great no real problems. Starting in Drive provided a maximum starting ratio of 3.10:1 (a mechanical ratio of 1.44:1 times a nominal torque converter stall ratio of 2.16:1 at around 1,600 rpm), which was better than the early Ultramatic or Dynaflow, but still made for lazy performance, especially with Studebakers six-cylinder engine. This and the GM automatic history are probably the most definitive descriptions of these technologies on the Internet, excepting pure design and engineering treatises. A converter that might have a stall speed of 5,000 rpm for a pure drag car would be completely miserable on the street. Unlike Ultramatic and many subsequent torque converter automatics, the converter of the DG series was completely inoperative in top gear, so obtaining any additional torque multiplication required a downshift to second gear. When it comes to automatic-equipped street machines and drag-race cars, the torque converter is a welded-up magic box that few enthusiasts know much about. In the event we receive any compensation and/or other valuable consideration for any other content presented on this website, the nature of that compensation or consideration will be disclosed as part of the applicable content and/or otherwise adjacent to it. When you coast in gear, the transmission attempts to drive the engine crankshaft, whose inertia causes a braking effect. The replacement was a cheaper and somewhat simpler Borg-Warner unit which Studebaker-Packard called Flightomatic that deleted the DGs lockup clutch. The fluid did not look dirty. by SirHandyMan Sun Apr 07, 2019 9:43 am, Post Its weird its not noticable as even a new soft engaging lock up but it acts somewhat like it has one. Second, the nonlinear relationship between impeller and turbine speed can be troublesome. There are tried and true methods for fixing the five common torque converter issues. Second, consider draining and filling the transmission a few times since you can't get all the fluid out with just one drain/fill cycle. Your email address will not be published. These a11y cookies normally expire after about seven days, but are removed immediately if you restore the applicable settings to their default values. Input output shaft readings are almost exactly the same when driving. mroberthowell 4 yr. ago Thank you so much! I changed the transmission fluid (Mercon LV) at 63k miles back in 2017. Cookies whose names begin with "_ceg" are associated with the Crazy Egg web analytics service (which is subject to the Crazy Egg Privacy Policy and Cookie Policy). The downside to these converters is that they are heavier and more expensive than non-lockup converters. Post Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. (author diagram). I think you should check the fluid level first and foremost. A torque converter clutch (TCC) is an important element of automatic transmissions because it affects fuel economy and driveability. (For more information about our discontinuation of Google Analytics tracking on this website, see the "Online Tracking" section of the Privacy Policy. Submitting a comment signifies your acceptance of our Comment Policy please read it first! They normally expire after about one year. Aaron is probably now the best informed person in the world regarding the history of automatic transmission development, I appreciate the compliment, but Im really not! The DG series transmissions obtained their indirect ratios with a compound planetary gearset.