torque converter slip actual vs desired

Impeller Pump The impeller pump receives the transmission fluid once it's delivered. In first, the low band and one-way clutches held both sun gears, causing the ring gears to drive the planet carrier and output shaft at 43.3% of turbine speed (1 / 2.31). Cloudflare Ray ID: 7c0ed4b42f522a79 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). I had just bought an SCT with Gearhead tunes. Sure, there's all kind of talk about stall speed, slippage, and lockup features, but some gearheads secretly believe there's as much voodoo to a torque converter as there is science. Thanks for this. Change Background Color (Note: This option sets cookies on your device to manage your color settings; see the Cookie Notice for details.). 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). If the solenoid is not regulating the fluid flow properly, it could cause variability in the torque converter clutch performance as well. 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. When you coast in gear, the transmission attempts to drive the engine crankshaft, whose inertia causes a braking effect. For more information about Google advertising, see the "Advertising" section of their Google Privacy & Terms site. I think you should check the fluid level first and foremost. Obviously some sort of mechanism would have been required to determine what gear to select and when to actually shift, but starting with a Wilson box at least some of the problems would have been solved. Just thought I would share with everyone some recent learnings I've had with my 2010 EB Flex. * Various services, specials, or coupon offers are available at participating locations only. The Vimeo Cookie Policy does not currently disclose the normal durations of the cookies and similar technologies the Vimeo platform uses, but it appears that some may remain in your browser (or other user agent) for as long as your settings permit. Sep 16, 2013 #11 4 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? 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. The problems come in many sizes, shapes, and forms. Well Aaron . The multiplication factor is based on the speed difference between the turbine and impeller. I feel better and it makes more sense now. This is why lifting off the throttle in a car with a fluid coupling or torque converter can feel almost like shifting into neutral. AE parameters when looking for tranny slip? Come join the discussion about diesel performance, modifications, EGR deletes, troubleshooting, lift kits, tires, wheels, maintenance, and more! 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. They normally expire after about one year. Wilson pre-selectors were pretty well established technology, although not common, by the late 30s. The GM team that designed Hydra-Matic was certainly familiar with the Wilson preselector. But this shuttering is not caused by a disease. This slowly turns the blades of the driven fan in the same direction. Remember, a torque converter is a coupler between the engine and transmission. by SirHandyMan Fri Mar 29, 2019 3:24 pm, Post i called a trans shop and he had no answer,but it sounded strage to him. (For more information about our discontinuation of Google Analytics tracking on this website, see the "Online Tracking" section of the Privacy Policy. Once the clutch plate is fully engaged against the pressure plate, both must turn together at the same speed. This is why a disc clutch must be disengaged or the transmission shifted to neutral whenever the vehicle stops. 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. 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. Unless you have tune that keeps the converter unlocked, the converter should've locked. Cookie Notice The wire chaffing is a definite possibility. In the early Studebaker Automatic Drive (Borg-Warner DG) transmission, the flywheel drives the torque converter impeller, front pump, and lockup clutch pressure plate (red). 6 speed/8 speed RWD/FWD Transmission Tuning (incl T43, T76, T87) T43 Torque Converter Desired Slip. To fix the problem, you need to discover the seal that's damaged and have it replaced. 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. (author diagram). Okay, so it sounds like you were able to identify a potential root cause. Second, the nonlinear relationship between impeller and turbine speed can be troublesome. As these vehicles age, diagnosing these issues can become more challenging. Stator The stator is called the middleman. Off.).) For comparison, a four-speed Wilson pre-selector has four planetary gearsets, four sets of brake bands, and a cone clutch, which is a lot of pieces. To learn more about the specific cookies used and/or to fine-tune your available choices, click "Privacy Preferences" at the right. It stayed there(18.24) from 60mph to 90 when I let off of it. This website is using a security service to protect itself from online attacks. Crazy Egg is a trademark of Crazy Egg, Inc. Optimizely is a registered trademark of Optimizely, Inc. in the United States, EU, and elsewhere. The drive fan moves air across the blades of the driven fan (which is turned off). There is going to be some slip. The speed difference between impeller and turbine is simply lost to heat within the operating fluid. .. makes you appreciate the thought and consideration that goes into EFILive if only we could clone the boys (and girls) of EFILive, imagine a Delphi Ross and Bosch Ross, By WS600 in forum General (Petrol, Gas, Ethanol), By Bradazz in forum 4speed RWD/FWD Transmission Tuning (incl T42), By joecar in forum 4speed RWD/FWD Transmission Tuning (incl T42), 6 speed/8 speed RWD/FWD Transmission Tuning (incl T43, T76, T87), http://forum.efilive.com/showthread.012-T43-Tables, If this is your first visit, be sure to If your car transmission keeps overheating, you may also notice your transmission starts to act funny, or it may even go into fail date and stay in one gear and not shift at all. Its job is to smoothly convert engine torque into hydraulic pressure that your transmission uses to engage and shift gears. That could be within the margin of error for the sensor. You are using an out of date browser. I never saw a problem with the converter, it never went over 3 to 4 RPM slippage at WOT with it locked. 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. Vehicle weight is another major factor that should be considered when selecting a converter. In drive at 0 speed TCD should read 1020 rpm and TCA should be Engine RPM - However, the cookie may remain on your device for as long as the settings of your browser (or other user agent) permit. The stator is called the middleman because it serves as the conduit that reverses transmission fluid and sends it back to a turbine impeller. You can email the site owner to let them know you were blocked. (If you need to review or change these settings after you accept, you can do so from the Privacy Tools page.) One is turned by the enginge. The one for torque slip desired is 1020 rpm. Think of it as two fans facing eachother inside an enclosure. In this schematic of a basic three-element torque converter with lockup clutch, the torus cover, lockup clutch pressure plate, and impeller (red) all rotate with the engine flywheel. Do you want them slipping when driving? check trans fluid. 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. Many of the other listed cookies are associated with the Google Analytics service, the Google AdSense advertising service, and/or other Google advertising and measurement products, which are subject to the Google Privacy Policy; 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, the "Technologies" section of their Google Privacy & Terms site, and the "Our advertising and measurement cookies" section of the Google Business Data Responsibility site (which includes a detailed list of cookies associated with Google advertising and measurement products) for more information. In this diagram, the yellow arrows show the power flow in second gear. Packard achieved that goal by treating the engagement of the lockup clutch like an automatic gear change. On early Ultramatic-equipped Packards, the lockup clutch would not engage until road speed reached at least 15 mph (24 km/h) even on a light throttle. The stock converter wouldn't with a big tune unless I was cruising at light throttle. It ran pretty good. That includes the advanced manufacturing technology being used in optimizing torque converters. by SirHandyMan Sun Apr 07, 2019 9:43 am, Post Fri Aug 30, 2019 10:22 am, You need to be a member in order to post a reply, Not a member? Reach out to your local AAMCO transmission center when youre ready for your efficient, smooth and worry-free ride. A healthy plate clutch slips only briefly when engaged or disengaged. Torque converter problems have a high impact on your car's ability to function and drive. The fluid did not look dirty. ), These cookies were previously used by the Google Analytics service to collect information about visitors and their use of the Ate Up With Motor website. Almost no one thinks of it, but when you drive your automatic transmission car, you're master over your cars torque converter. Performance & security by Cloudflare. Manage Preferences - 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. It will read really high numbers until the converter is locked. I don't think they had this in 2011 however. My SunCoast converter has a little slip. The cookies are not set at all unless you select that option when submitting a comment. Have you ever gotten in your car, started it up, put it in gear only to feel it shudder? Forum. Twice last week, when I came up to a stop light, the engine bogged down to 400rpm then recovered back to normal idle. I took it to my mechanic and he too found nothing wrong. Privacy Statement - Click to reveal (author diagram). 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. However, that did not cure the shuddering problem. (not Diameter) Thanks for copying the information from my other post here. but the question is when i put my buddys obd code finder on it. The combination of a smaller-diameter and lighter converter means that less engine torque is required for acceleration. 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. 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.

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torque converter slip actual vs desired

torque converter slip actual vs desired