These torque converters allow some slippage but it should not vary much from the desired PCM value. The issues of slippage and heat are the main reasons that street converters should be approached with a serious amount of compromise when it comes to stall speed. Submitting a comment signifies your acceptance of our. Keep reading to find out these common torque converter problems and how to fix them. mroberthowell 4 yr. ago Thank you so much! 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). Your Transmission Gear Ratio at Finish Line. Privacy Policy. A forum community dedicated to Ford Power Stroke owners and enthusiasts. 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. Im not able to provide repair or maintenance advice, sorry! This is not a huge factor in the overall lower-e.t. Hence, you've commanded your torque converter every time your car shifted gears. To learn more about the specific cookies used and/or to fine-tune your available choices, click "Privacy Preferences" at the right. (For more information about our discontinuation of Google Analytics tracking on this website, see the "Online Tracking" section of the Privacy Policy. 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. 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. The problems come in many sizes, shapes, and forms. (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.). Desired is what the PCM is commanding and Actual is how much it is actually slipping measured in RPM. As an example, replace your spark plugs if they are original, replace air filter, replace PCV valve. Big cars weighing over 3,300 pounds generally need a converter with more torque multiplication. (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.) If you are experiencing shuddering, also check your engine mounts. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Crazy Egg is a trademark of Crazy Egg, Inc. Optimizely is a registered trademark of Optimizely, Inc. in the United States, EU, and elsewhere. They normally expire in just under one year, but you can delete the cookies in your browser (or other user agent) at any time. i called a trans shop and he had no answer,but it sounded strage to him. Most street cars cannot keep the rear tires from spinning if you add too much throttle, and this tends to limit the stall speed. 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. (author diagram). *. First, that slip wastes some fuel youre paying for more engine revolutions (and more power) than reach the driveshaft. (Both turbines, here colored medium blue, were bolted together into a single unit, but had different blade profiles.) I had unlimited tow loaded and he thought maybe it wasn't playing nice with my trans. Some vehicles have a transmission temperature indicator that will let you know when your car's transmission is overheating. In drive at 0 speed TCD should read 1020 rpm and TCA should be Engine RPM - * Various services, specials, or coupon offers are available at participating locations only. You usually notice your car shuddering because itfeels like it's vibrating. Advertising - Doesn't seem to coincide with vehicle shifting though. The information below will outline the most common torque converter issues and their solutions. A high-stall converter like a 4,000-rpm unit is not only lazy from a part-throttle-efficiency standpoint, but it also generates much more heat. The lockup clutch control valve, not pictured, allows pressurized oil to enter the clutch cylinder through a hollow passage within the input shaft, pushing the pressure plate (colored red, like the torus cover and impeller it rotates with) into the engaged position. I found the cause of the P0325 and P0330 error codes. ), 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. Larger-diameter converters are usually more efficient and deliver less slippage, while smaller-diameter converters offer more stall speed and more slippage. iThemes is one of the Liquid Web family of brands; iThemes and Liquid Web are trademarks of Liquid Web, LLC.). The valve was pushed open or closed by opposing pressures generated by a throttle-controlled valve and a centrifugal governor driven by the output shaft. 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. Also, engaging a lockup clutch will prevent a torque converter from multiplying torque. Think of it as two fans facing eachother inside an enclosure. This slowly turns the blades of the driven fan in the same direction. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. 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. the only readings i got was for all the electronically controlled aod. Thu Aug 29, 2019 1:33 am, Post How exactly are you measuring how much the tc is slipping? if someone would have put in a used ecu ,fron a electric controlled aod. Over 10 RPM is real slip. This is a red flag that lets you know you may need an expert to repair it for you. 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. For a better experience, please enable JavaScript in your browser before proceeding. I checked for codes and had none that explained why it happened. The wire chaffing is a definite possibility. Performance & security by Cloudflare. This viscous connection is transmission fluid. It took the addition of a small device called the stator to increase the efficiency of the fluid coupling and transform it into a torque converter. Any slip is bad. scheme, but it does contribute. Stall speed is measured in the car by applying the brakes and revving the engine in First gear against the brakes. AAMCO Centers are independently owned and operated. The turbine drives the front annulus through the input shaft (medium blue). The torque converter is so essential to the global car market theres a global torque converter market. (author diagram). 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. (not Diameter) So far the bogging down hasn't happened since last week. When you coast in gear, the transmission attempts to drive the engine crankshaft, whose inertia causes a braking effect. However, such a lockup clutch cant remain locked all the time. They may persist for up to two years. However, even at coupling stage, the turbine still turns somewhat slower than the impeller. If the engine is not running smoothly and/or delivering consistent power, it can cause fluctuation in the "Desired" versus "Actual" torque converter clutch slippage along with a surging feeling. Heat is the enemy of any automatic transmission and will radically reduce its life span if not mediated by an efficient trans cooler. Well Aaron . I had just bought an SCT with Gearhead tunes. Your IP: Basically, the fluid exits the center of the turbine and is redirected by the stator back into the impeller. I believe it is labeled as TQSLIP(rpm) under Ford Specific PID's. A reverse band surrounds a brake drum connected to the front carrier, which is also integral with the rear annulus (orange). Your ring and pinion (gear size) Your circumference or roll out of the rear tires. The combination of a smaller-diameter and lighter converter means that less engine torque is required for acceleration. You also need to move forward with viable options that will help you get your torque converter fixed. Being a fluid coupler, your car's torque converter relies on transmission fluid to operate correctly. This overran the rear unit planet carrier, unlocking the rear sun gears one-way clutch and putting the transmission in direct drive. In my limited experience, a failing converter in this transmission will start to throw off a lot of black carbon and cause the fluid to rapidly darken. The reason for increasing stall speed is directly related to the engine's torque curve. 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. 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. The drive fan moves air across the blades of the driven fan (which is turned off). (Google, Google Analytics, and other related marks and logos are trademarks of Google LLC. Comments may be moderated. The Fora platform includes forum software by XenForo. We thought 10 was bad 2 years ago. The impeller pump receives the transmission fluid once it's delivered. When that connection is fully engaged, the fluid clutchs torus members are effectively locked together they must turn together at engine speed and transmit no torque. For example, in park, it will say Desired Slip 1200, Actual: 730 (guess the engine rpm) As speed increases, the Desired Slip drops (don't remember exact numbers) as well as the actual. The result will be every car will have efficient, smooth, and comfortable rides. 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)). The turbine and lockup clutch driven plate are both splined to the transmission input shaft (medium blue). Theshuddering makes the car lagand is very noticeable. They normally expire after about one year. A lot of bad things can happen to your car when the torque converter starts failing. but the question is when i put my buddys obd code finder on it. In the diagram above, the yellow arrow again illustrates the flow of power, this time in third (top) gear. Accessing the login page sets the wordpress_test_cookie, a session cookie that tests whether the user's browser (or other user agent) will allow the cookies needed to log in to the administrative dashboard; this cookie normally expires when the user closes their browser (or other user agent). During a shudder the desired will stay close to 0rpm but the act pid will go up and down in rpm. For a better experience, please enable JavaScript in your browser before proceeding. This website is using a security service to protect itself from online attacks. 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. All site content Copyright 2007-var year=new Date(); year=year.getYear(); if (year<1900) year+=1900; document.write(year); FordFlex.net FordFlex.net is in no way affiliated with Ford Motor Company. by SirHandyMan Fri Mar 29, 2019 6:54 pm, Post When you have contaminated transmission fluid that has bits of this and that in it This is an indication that you have bigger problems inside the converter or transmission. Your car's automatic transmission has a torque converter. All engine power flows through the mechanical clutch directly to the input shaft. How ever this did happen right after I did the six 0 to 60 mph relearn runs. Such cookies and/or stored data items may be set by various domains (such as, though not necessarily limited to, youtube.com; youtube-nocookie.com; googlevideo.com; ytimg.com; google.com; accounts.google.com; www.googleadservices.com; and/or doubleclick.net, which is part of the DoubleClick advertising service, also owned by Google LLC). Your Transmission Fluid is Contaminated. Theglobal torque converter marketcontinues to grow and expand at a CAGR of 4.54%, which is projected until 2021. 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. This is most noticeable from about 1200-1800 rpm. Borg-Warner continued to sell the DG series for several more years to some non-U.S. customers, but U.S. automakers would not rediscover the lockup clutch for another 20 years. This is why a disc clutch must be disengaged or the transmission shifted to neutral whenever the vehicle stops. Fluid clutches also dont allow much engine braking. Google, AdSense, Google AdSense, Google Analytics, and other related marks and logos are trademarks of Google LLC. I feel better and it makes more sense now. 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The logic of these schematics, which are not to scale and which have been greatly simplified for clarity, is that each color represents a set of components that are integral or otherwise connected so that they always rotate together; clutches, brake bands, planet pinions, and flywheels are shown in black or gray. 7.3L Power Stroke - Aftermarket & Performance. ), 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. Hydraulic slippage also offers some advantages during acceleration: As with a plate clutch, a certain amount of slip makes for a much smoother takeoff. Many times, people think there is something wrong with their transmission when the problem lies with their torque converter.
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