Part 3 of 3 High Performance Academy Sonnax and SIU - Mega Torque. Well Aaron . Okay, so it sounds like you were able to identify a potential root cause. Fluid clutches also dont allow much engine braking. A spring-loaded plunger valve controlled oil flow to the lockup clutchs hydraulic cylinder. With the advent of overdrive automatic transmissions like the TH200-4R, the TH700-R4/4L60E, the massive 4L80E, the Ford AOD, and all the rest, the new-car companies were striving for improved fuel economy using overdrive. (Those pages do not currently discuss the storage of data in your browser (or other user agent) using technologies other than cookies, e.g., in web storage.) It will read really high numbers until the converter is locked. This created the demand for a lockup converter employing an internal clutch inside the converter to directly connect the turbine with the input shaft of the transmission just like a manual-transmission clutch. 6 speed/8 speed RWD/FWD Transmission Tuning (incl T43, T76, T87) T43 Torque Converter Desired Slip. There are several ways to arrange such a clutch, but the common object is to create a mechanical connection between the engine and the transmission input shaft (which otherwise is driven by the fluid clutchs turbine(s)). abs, do you have any recommendations on how to troubleshoot a failing torque converter using ForScan? For a better experience, please enable JavaScript in your browser before proceeding. The Fora platform includes forum software by XenForo. 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. It is the lack of fluid that causes overheating, slipping, or shuddering. 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. So, you can see how those would be preferred from a standpoint of cost and packaging! Except as otherwise indicated, all written content and images are copyright Aaron Severson dba Ate Up With Motor. Google, Google Analytics, and other related marks and logos are trademarks of Google LLC.). Ultramatics lockup clutch was a hydraulically operated wet clutch located within the torque converter housing, between the engine flywheel and the converter turbine. PLEASE DON'T SUBMIT COPYRIGHTED CONTENT YOU AREN'T AUTHORIZED TO USE! Heat is the enemy of any automatic transmission and will radically reduce its life span if not mediated by an efficient trans cooler. (author diagram). This is how the first fluid couplings were designed, but they were hideously inefficient because of high slippage. Reach out to your local AAMCO transmission center when youre ready for your efficient, smooth and worry-free ride. 91.234.33.200 This is a remarkably broad, convoluted, and idiosyncratic field and theres a LOT I dont know. Input output shaft readings are almost exactly the same when driving. The DG series transmissions were notionally three-speed automatics (although early iterations were designed to start in second gear) with a torque converter lockup clutch. A healthy plate clutch slips only briefly when engaged or disengaged. I had unlimited tow loaded and he thought maybe it wasn't playing nice with my trans. They may persist for up to two years. But the most common torque converter problems are listed below. There are many different types oftorque converter problems. I re-used the "new" valve body and decided to try out my original solenoid pack to avoid having to reprogram the PCM with the new calibration for the solenoid pack that came with the recycled transmission. The first automatic transmissions employed what was called a fluid coupling to connect the crankshaft with the transmission. 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. 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. another masterpiece. The end result is the torque converterisn't able to transferthat power completely and efficiently from the engine to the transmission. The turbine and lockup clutch driven plate are both splined to the transmission input shaft (medium blue). works great no real problems. Input output shaft readings are almost exactly the same when driving. A lot of bad things can happen to your car when the torque converter starts failing. 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. You usually notice your car shuddering because itfeels like it's vibrating. We were wrong. You've now repaired or replaced your torque converter if it exhibited any of the above common torque converter problems. Your car's automatic transmission has a torque converter. I havent studied the Wilson preselectors in any great detail, but if youre curious, the applicable U.S. patents are US1404675 and US1796904. Unsurprisingly, each engagement or disengagement of the lockup clutch felt like a shift, giving less technically knowledgeable drivers the mistaken impression that Ultramatic was a two-speed automatic. Click to reveal Although torque converters are ideal launch devices for. 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. In this installment of Ate Up With Motor, we take a look at how GM, Ford, Chrysler, Packard, and Studebaker have approached this slippery problem from 1949 through the late eighties. and our Plugging it back in all the way and resetting the PCM took care of that problem. I have read and accepted the Privacy Policy Your ring and pinion (gear size) Your circumference or roll out of the rear tires. A multi-disc clutch can lock that carrier to the front sun gear, which is also attached to the rear brake drum (dark red). Another fascinating article, thank you for all your effort! Introduced for the 1950 model year, Studebakers Automatic Drive was developed in partnership with Borg-Warner and was more broadly known as the DG series, after the Borg-Warner Detroit Gear Division that did much of the development work. I changed to the Spartan V2 a few weeks ago. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. For more information about how Akamai may collect, process, and/or use personal data, visit the Akamai "Privacy and Policies" page and Privacy Trust Center. Cookie Policy - I no longer monitor the forum, please either post your question or create a, I am just trying to see how the management of this company can justify ignoring, or walking away from the T43 stuff right now, I am aware of the size of the Dodge Diesel market.I for one do not care about Dodge Cummins products, I have turned so many of my customers onto EFI Live from HPT or SCT that it kills me to have to tune a TCM with one software and ECM with another. Now that we have DISCONTINUED our use of Google Analytics tracking on this website, this cookie no longer functions no additional analytics data will be collected, with or without the cookie. The torque converter is made up of five parts: 1. ), These third-party cookies may be set in connection with embedded video players for content hosted on the Vimeo video platform, for purposes such as (without limitation) managing video settings, storing video preferences, providing certain functionality (e.g., allowing you to pause a video at a particular point), associating your video viewing and other activity with your Vimeo account (if you have one), showing you advertising, ensuring proper functioning of the service, preventing abuse, and/or compiling user analytics data. If you correctly enter the password, the site saves this cookie on your device to allow you access to the password-protected post or page. These torque converters allow some slippage but it should not vary much from the desired PCM value. A 5 percent slippage factor means that if the impeller is spinning 3,000 rpm, the turbine is only spinning 2,850, or 5 percent slower. 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). There are a number of posts referencing this issue, look for the wires coming out from under the intake manifold behind the elbow that contains the coolant thermostat. 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 would suggest starting with the transmission upper mount and also a transmission fluid drain and fill. By logging into your account, you agree to our. 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. Accessing certain posts or pages on this website may require you to enter a specific password. All other trademarks and/or service marks are the property of their respective owners. I just checked it yesterday and it was right at the full indicator with the transmission properly warmed up. At idle and very low road speeds, slippage is desirable because it keeps the engine from stalling or lugging in gear. Your IP: T43 Torque Converter Desired Slip. 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). The torque converter clutch is always slipping somewhere between 5% to 95% when engaged, which depends on vehicle speed and engine load.. We discussed the information to monitor on the scan tool, there is an actual slip, desired slip, and TCC status. The only problem - there's a boat-load of information and I only know how to interpret a fraction of it. I believe it is labeled as TQSLIP(rpm) under Ford Specific PID's. I never saw a problem with the converter, it never went over 3 to 4 RPM slippage at WOT with it locked. But once they are damaged, you will experience fluid leaks.
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