Less than 15rpm is normal and more than that will cause shudder. 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. To learn more about the specific cookies used and/or to fine-tune your available choices, click "Privacy Preferences" at the right. 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) To learn more about how Google may use information collected by the Google Analytics service, 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, and the Google Privacy Policy. 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). Your IP: Members can start their own topics & subscribe to topics This is a very slick trick and can be worth up to 2.5 times engine torque! 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. For more information, please see our I cant imagine the hours of work which you must have put into understanding these various transmissions, to say nothing of writing up a description that a simpleton like me could (mostly) understand. Theshuddering makes the car lagand is very noticeable. Utimately, I installed a recycled transmission from a junk yard and a remanufactured torque converter from Ford. Actual shows 640 rpm in drive with the brake on. This slippage is part of what determines the stall speed of the converter. ), 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. 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. 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. Post Your ring and pinion (gear size) Your circumference or roll out of the rear tires. All engine power flows through the mechanical clutch directly to the input shaft. Please register or login to enable Dark Mode. 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. This will cause damage to both the transmission and the converter. Part 3 of 3 High Performance Academy Sonnax and SIU - Mega Torque. These early units operated on the same principal of using one electric fan to drive another. I was running the KEM 250 and 310 tunes. One of the fundamental differences between a fluid clutch (a fluid coupling or torque converter) and a mechanical plate clutch is slippage. Torque converter clutch slip Scan tool values 99 GMC Pickup GM's 6L80 HP Tuning, DoD, and Torque Converters! Ate Up With Motor, its logo, and other associated icons and graphics are trademarks and/or service marks of Aaron Severson dba Ate Up With Motor. (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.) Privacy Statement - If the engine isnt free to turn faster than the driveshaft at rest or extremely low speeds, the engine will stall! Thanks for this. Fluid clutches fluid couplings and torque converters have many advantages for automotive transmissions, but with those benefits comes a cost: fuel-wasting hydraulic slippage even at cruising speed. but the question is when i put my buddys obd code finder on it. Only lasts from .5 seconds to 2 seconds. I drove only sticks for years by choice. Really bad shuddering under acceleration, etc. The turbine drives the front annulus through the input shaft (medium blue). The turbine has a spline that attaches to the transmission input shaft, which connects to the internal parts of the transmission to shift gears and provide power to the wheels. For example, if engine speed is 2,500 rpm, the turbine might only turn 2,375 rpm: hydraulic slippage of 5%. Required fields are marked *. One thing Ive always wondered about was if any manufacturers looked into Wilson pre-selector gearboxes as a basis of an automatic. In second, the low band was released and the multi-disc clutch engaged, causing both ring gears to rotate at turbine speed. there were around 6 defaults that popped up. I did the trans relearn today with the Spartan 275 tune. abs thank you for posting your experience here. But the most common torque converter problems are listed below. At idle and very low road speeds, slippage is desirable because it keeps the engine from stalling or lugging in gear. California residents also have the Right to Opt-Out of the sale of their personal information see the Do Not Sell My Personal Information page. The rear planet carrier is attached to the main shaft, which is also splined to the lockup clutch and drives the rear oil pump and governor (medium green). 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)). 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(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). In fact, Cadillacs chief engineer ordered an early Daimler Double Six with the Wilson and Laurence Pomeroys Fluid Flywheel for evaluation purposes. This is how the first fluid couplings were designed, but they were hideously inefficient because of high slippage. The stator is called the middleman because it serves as the conduit that reverses transmission fluid and sends it back to a turbine impeller. Contaminated transmission fluid can cause damage to your converter parts and your transmissions parts. The torque converter is made up of five parts: 1. Think of it this way, a well built converter, 10" may slip 4-5%, if yours slips 6-7% higher, you are baking the fluid, cooking the band, and compromising the clutches, and giving up mph and ET. (author diagram). 1. and 2. As an example, replace your spark plugs if they are original, replace air filter, replace PCV valve. I never saw a problem with the converter, it never went over 3 to 4 RPM slippage at WOT with it locked. but my truck has 25k on it and 10k tuned.. so im thinking mines not on the way out and its got 20rpm slip. The annulus (purple) is held in reverse, idles in low, and rotates with the sun gears in direct drive. I agree that a manual transmission option would be great. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. (We have now DISCONTINUED our use of Google Analytics tracking on this website; see the "Online Tracking" section of the Privacy Policy for more information.) 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. I've got reason to believe my torque converter is going out, which readings can I look at to determine if that's actually my problem? (Vimeo and the Vimeo logos are trademarks of Vimeo.com, Inc., registered in the U.S. and other countries. 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. Submitting a comment signifies your acceptance of our Comment Policy please read it first! Unless you have tune that keeps the converter unlocked, the converter should've locked. All other trademarks and/or service marks are the property of their respective owners. (For more information about our discontinuation of Google Analytics tracking on this website, see the "Online Tracking" section of the Privacy Policy. Remember, a torque converter is a coupler between the engine and transmission. Except as otherwise indicated, all written content and images are copyright Aaron Severson dba Ate Up With Motor. For a better experience, please enable JavaScript in your browser before proceeding. 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