Reach out to your local AAMCO transmission center when youre ready for your efficient, smooth and worry-free ride. U.S. Pat. Torque converter problems have a high impact on your car's ability to function and drive. The space ahead of the clutch formed a hydraulic cylinder containing an annular steel piston that acted as a pressure plate. If the engine isnt free to turn faster than the driveshaft at rest or extremely low speeds, the engine will stall! 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. You've now repaired or replaced your torque converter if it exhibited any of the above common torque converter problems. This viscous connection is transmission fluid. check trans fluid. At idle and very low road speeds, slippage is desirable because it keeps the engine from stalling or lugging in gear. 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. In order to get a realistic value, use: Your finish line MPH (from ET slip) Your finish line RPM. (author diagram). It is the lack of fluid that causes overheating, slipping, or shuddering. For more information about Google advertising, see the "Advertising" section of their Google Privacy & Terms site. I was running the KEM 250 and 310 tunes. The knock sensor wire harness connector was loose. If it does go let us know. 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. Wallace Racing - Converter Slip Calculator I just checked it yesterday and it was right at the full indicator with the transmission properly warmed up. Packard achieved that goal by treating the engagement of the lockup clutch like an automatic gear change. would it work,yet throw out aod default codes. Your car will vibrate even when youre not going very fast. A torque converter clutch (TCC) is an important element of automatic transmissions because it affects fuel economy and driveability. My SunCoast converter has a little slip. Hydraulic slippage is much less desirable at cruising speed. But the catch is that this torque multiplication doesn't last very long. It will also integrate that knowledge with what type of car and transmission consumers are buying. How To Log Transmission And Torque Converter Slip In HPtuners!!! (If you need to review or change these settings after you accept, you can do so from the Privacy Tools page.) The usual strategy is to disengage the clutch at idle (or just off idle) and during acceleration and then then engage the clutch for cruising. The end result is the torque converterisn't able to transferthat power completely and efficiently from the engine to the transmission. by SirHandyMan Wed Mar 27, 2019 12:52 pm, Post one of the strange quirks of these transmissions is if they are a quart or so low it will feel like the torque converter does not disengage at stop. These torque converters allow some slippage but it should not vary much from the desired PCM value. 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. 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. Also, engaging a lockup clutch will prevent a torque converter from multiplying torque. 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. RPM. Turbine Input Speed Sensor. - Ford Powerstroke Diesel Forum 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. Tire slip is likely causing your speed difference. Any reading below 10 RPM slip is really errors in reading the sensors, not real slip. The turbine drives the front annulus through the input shaft (medium blue). Many times, people think there is something wrong with their transmission when the problem lies with their torque converter. Privacy Policy. Being a fluid coupler, your car's torque converter relies on transmission fluid to operate correctly. The annulus (purple) is held in reverse, idles in low, and rotates with the sun gears in direct drive. 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). JavaScript is disabled. Heat is the enemy of any automatic transmission and will radically reduce its life span if not mediated by an efficient trans cooler. If you shop at Amazon.com (for anything), use this link to support FordFlex.net! Whether it will add to my working knowledge is debatable, but my brain will benefit from the workout. How exactly are you measuring how much the tc is slipping? As an example, replace your spark plugs if they are original, replace air filter, replace PCV valve. You can email the site owner to let them know you were blocked. I believe it is labeled as TQSLIP(rpm) under Ford Specific PID's. It's also important not to undersell converter weight as a contributing factor to maximizing acceleration. The TC is a viscous coupling. Transmission Range) start a datalog or have an assistant drive and watch Torque Converter Slip Actual (TCA) and Torque Converter Slip Desired (TCD). Reddit and its partners use cookies and similar technologies to provide you with a better experience. A multi-disc clutch can lock that carrier to the front sun gear, which is also attached to the rear brake drum (dark red). (Google, DoubleClick, YouTube, and other related marks and logos are trademarks of Google LLC. Fri Aug 30, 2019 10:22 am, You need to be a member in order to post a reply, Not a member? Ate Up With Motor and its embedded content providers may use cookies and/or similar technologies and collect personal information about site visitors as described in the Privacy Policy and Cookie Notice. Once the brakes (or the transbrake) is released and the vehicle begins to move, the turbine spins up and the speed difference between the two diminishes. 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. It stayed there(18.24) from 60mph to 90 when I let off of it. 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.