Once again, the more torque your engine makes, the higher your torque converter will stall. The process creates excessive heat in the torque converter, not to mention the fact that … Dirty transmission fluid (opaque or foul-smelling) Many torque converter failures can be caused by excessive friction, which means the torque converter’s needle bearings are damaged. RevMax Bike Challenge with the CMPD Explorers Reaches Record Success! If choosing a torque converter for use in a street car, you might want to select a torque converter with a stall speed that is below the engine RPM at 70 mph, since this is where your engine will spend a lot of its time. Stall speed is the speed at which the converter holds back or limits the engine speed if the transmission output is prohibited. converter identifying data. Unfortunately, this will mean slow engagement in higher stall speeds. This is the first segment in our series on stall speeds. In towing, the proper stall speed will help your engine pass more power to your transmission, causing your tow capacity to increase. X Research source For instance, a torque converter with plenty of clearance between its inner components will have a higher stall speed than a converter without much clearance. : a converter with a multiplication ratio of 2.5:1 that stalls 3000 rpm will produce 500 ft.-lbs. H-- 1397 stall; K-- 1211 stall; L-- 1654 stall . The RevMax Bike Challenge | Charlotte Mecklenburg Police Department, RevMax 68RFE Signature 1000 featured in 8 Lug and Diesel Power Magazine, The part you are purchasing contains a component that is recyclable, The Core Charge deposit is charged at the time of purchase, When the recyclable component from your old part is returned to us, the charge is refunded to you, Bring the part to the RevMax shop along with your receipt or packing slip. You don’t want to have to floor your gas pedal and wait a few seconds for your vehicle to move. The speed at which stall occurs with a given converter is a function of engine-peak torque. It is filled with fluid and it spins with the engine crankshaft. Here are some other quick tests you can try out: Go for a long drive and pay attention to the way your car shifts. Yes, you have a torque (stall) converter because you have an automatic trans. For racing, the proper stall speed will increase your launch and get you off the line quicker. [] How to choose the stall speed of a converterYou can find all sort of descriptions and explanations, but your first interest is in what your stall does for your car. The range listed will tell you what to expect from the converter. 1600 to 1800 torque converter. Hi everyone. The same converter that stalls at 2,000 rpm on a stock truck could stall at 2,300 rpm on another one where the engine is making more torque. If it shifts slower than normal, this may indicate a problem with the torque converter Highperformance torque converters stall at higher engine speeds because you want the engine well into its power band when the converter stalls (begins to move the turbine and vehicle). This means that a torque converter designed to stall at 3,500 RPM with a mild small block might stall might stall at 4,000 RPM behind a fire-breathing LSX454R with 720 pound feet of torque. If your torque converter is a welded unit, you need to search the exterior of the unit for any identifying marks, most notably on the engine side or "bottom" of the converter. Torque Converter Diagnosis: What is Flash Stall? Most of the benefit of a big stall comes in takeoff. GM uses the same type 4-digit ID method of identifying FWD torque converters as with the RWD units, however the digits have different meanings. For instance, if your camshaft operates between 1,600 and 5,200 RPM, a good torque converter stall speed would be 2,100 RPM. If your camshaft has an operating range of 1,500 through 6,500, you would select a torque with a minimum of 2,000 rpm stall. High Stall Fin Angle: High Stall Fin Angle: Letter Stamp on Pilot: C4 Stud Spread: Drain Plug: F71 Hub Height: E4OD/4R100 Pilot: 5R110W Pilot: AODE 4R70W 4R75W Low Stall Fin Angle: Low Stall Fin Angle: Low Stall Fin Angle: F70L: C4 Late Splines F71 Stamp 5R110W Gas Fin Angle: AODE 4R70W 4R75W High Stall Fin Angle ID Stamp: F70: C4 Early Splines 5R110W Diesel Fin Angle Stall is when the transmission is in gear, but the brakes prevent the car from moving. Expected Stall RPM: Converter Series: Advertised Cam Duration: Rear Gear Ratio: Engine Characteristics: SMALL BLOCK: BIG BLOCK: Street Rodder™ Stock to 260° Stock to 3.23: Smooth Idle, Stock Compression: 1500-1700 : 1700-1900 : Saturday Night Special® Stock to 265° Stock to 3.23 Almost every single modification done to a vehicle, from your intake back to your exhaust and gearing, will change the stall of the torque converter. To get a converter that stalls at the right speed for your application you need to speak to a converter builder. – JC Beattie, ATI Performance Products, Inc. The higher the stall of the converter the less traction you will feel like you have. Obviously, you need a good transmission cooler if you use a high stall converter. Recently I changed over to a 700R4 with a 36-3800 stall. If you over estimate, your stall speed will be lower than intended, which will reduce your torque converter’s performance. Most importantly, the engine has a higher idle speed. Re: Tourqe converter stall speed I don't mean to hijack your post but along the same line, I have an issue with my converter. Contact Us Today Using heavy equipment with a problematic torque converter can be hazardous and often leads to further problems with your machinery. Additional data pages are included at the front of each manufacturers section again, to assist in the identification of the correct converter. For more information about stall speeds and for more knowledge to get your gears reaving, stay tuned for our next installment! Mail the part back to RevMax following the directions on your packing slip. Since we know K = 150, we can predict the new stall speed if torque is increased to say 500 ft-lbs by rearranging the equation to rpm = K*sqrt{torque}. Power Adders or Naturally Aspirated. But torque converter stall speed directly affects vehicle performance, starting torque, and so on. Almost ALL converter/trans vendors STAMP an ID# into the body of their torque converters. Sure, stall speed is very important, but it is not the only factor to consider when buying a torque converter. Stock converters typically stall in the 1500 to 2000rpm range. The big question is what are you using it for? A forum community dedicated to hot rod owners and enthusiasts. By making changes to each of these parts, a torque converter manufacturer can dial-in where the converter will begin to stall the engine. Can I convert my 5spd shifter Last post by gchemist on 03-10-21 04:19 AM: SSR / HHR: 131 : 730 : abs sensor Last post by Shepherd on 10-18-20 01:38 PM: Off Topics Topics Replies Last post Chit Chat (A place for off topic discussions) A place for non specific fat chewing. Buy It Now. } While the stall test is a great indicator, it’s not the only test you can try. Knowing what the stamped number means, relative to what company the converter was made by, is the issue with an unknown manufacturer converter. Torque converters (a.k.a. Is the converter in a running drivable vehicle? GM uses the same type 4-digit ID method of identifying FWD torque converters as with the RWD units, however the digits have different meanings. Impeller. "Flash speed," on the other hand, is quite different. Share Video. Engine is a 302 being bored over .060 with 10:1 CR . This means that a torque converter designed to stall at 3,500 RPM with a mild small block might stall might stall at 4,000 RPM behind a fire-breathing LSX454R with 720 pound feet of torque. All 125-C, 440-T4, 4T60, and 4T60-E transmissions use the same style torque converter, and they are interchangeable before 1996. When you are selecting the right stall speed for your vehicle, be sure to match the engine’s peak torque, torque curve and vehicle weight. Wait for a few minutes for the engine to warm up, then gently press the accelerator twice and rev up the engine. Will be using RPM or Air GAP for manifold. Power Adders or Naturally Aspirated. Remember, the ratio is still a factor of the engine torque in the relevant range of the torque converter stall speed, i.e. The torque converter does what a clutch does in a manual vehicle—allows the engine to turn while the transmission stops, enabling the shifting of gears. 1. A faulty seal can allow fluid to leak and become contaminated. According to Hughes Performance, torque converter stall speed is the maximum amount of engine rpm that can be achieved in an automatic transmission-equipped vehicle while the transmission is in a forward operating range without generating any driveshaft motion. The only markings i see is a tag - 8653701 I wanted to lock up on the interstate but can not due to the stall being so far above the crusing speed of about 2200. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Torque converters transfer power by using an engine-mounted turbine to push oil (fluid) through a transmission-side turbine until … If a 2700-3000 is selected, you should be able to footbrake stall the converter to about 2700 rpm depending on the vehicle’s setup. Is there any way to determine what rpm stall it is by looking at? If so you can check it. Stalling is when the torque converter locks up during a load. A looser converter will allow you to hold the car with the brakes up to or close to the specified "stall" rpm. Now the problem is with the Stall test. This flow produces a maximum torque increase of 2:1 when the turbine is stalled. You have a torque converter instead. In this case, the slip in the Torque Converter is maximized. This flow produces a maximum torque increase of 2:1 when the turbine is stalled. Every explanation I have found sounded more like hand-waving than quantitative physical explanation. For the best drag strip results you want a converter that stalls at close to peak torque. Year Engine Dia Hub SPL Pilot Mount Pilot Center To Bolt Center Stall May specify various Engine When your torque converter prevents the power transfer from your engine to your transmission, it increases the engine’s RPM stalls. Comet Industries Torque Converter ID for Comet 20 Series, Comet 30 Series, Comet 40 Series, Comet 44 Magnum, TC88 and CAT99. You’ll need to check the engine’s stall speed designations and complete a test to identify any torque converter issues. Your stall speed will be the maximum RPM shown on the tach. The focus of this post will be to take a deep dive into this component, and even take a look at how to properly test out your torque converter. "stall converters") are a type of fluid coupler that transfers power from the engine to the transmission. Your stall speed will be the maximum RPM shown on the tach. Just wondering if you had an idea of what would be a good speed stall for me. The more stall speed you have, the more pressure you have to put on the gas pedal before your car begins to move. When enough torque is developed by the engine and the converter, the turbine begins to rotate and turns the transmission input shaft. of torque at the instance of full throttle acceleration if its coupled to an engine producing 200 ft.-lbs. To test the stall on your current torque converter: With the engine running and the brake pedal held firmly with your left foot put the selector in drive and depress the accelerator fully to the floor with your right foot for two to three seconds. Once again, the more torque your engine makes, the higher your torque converter will stall. This page is designed to assist you in identifying the torque converter in your transmission/vehicle. Ideally you want the stall to lock up somewhere close to the peak torque of the engine. If you are unsure about these modifications, the experts at RevMax Performance Torque Converters can help. Trans is a C4. High performance torque converters, like to ones sold at RevMax Performance Torque Converters, can do a lot for your vehicle when the proper stall speed is selected. Free Shipping; $599.99. Traction is a major factor in considering stall. If it won't "hook" now more stall … The torque converter is designed so the fluid flows from the impeller to the turbine then back to the impeller through the stator. Also consider … I keep reading all over the internet that a torque converter multiplies torque at stall speed. As described earlier, the Stall test is used in the design of torque converters when performing performance testing and fixing on vehicles. For a better experience, please enable JavaScript in your browser before proceeding. In a previous article, we covered the basics of what makes up a torque converter and how it functions within the driveline of your car.The hard parts of the torque converter that really affect the stall speed are the overall size of the converter, the pump blade angle, and the stator. PLEASE NOTE: The posting agreement is strictly enforced. Believe me, after 5 transmissions and years of beating on them, and seeing all kinds of people freaking out when the buy a "3500" converter and they can only get 2800 out of it, I have a bit of an understanding of what a stall speed is and how power, resistance, and design relate to it. As a part of your engine, camshafts operate within a certain RPM range. There's more. The rpm achieved (stall speed) will be a function of the engine torque and the converter design. H-- 1397 stall; K-- 1211 stall; L-- 1654 stall . All 125-C, 440-T4, 4T60, and 4T60-E transmissions use the same style torque converter, and they are interchangeable before 1996. The torque converter is designed so the fluid flows from the impeller to the turbine then back to the impeller through the stator. The stock converter will no longer stall at the same rpm it used to. Stall Speed and the “K” Factor Stall refers to the maximum speed a the motor can achieve against the converter when the turbine is locked and prevented from rotating. Effective in-vehicle torque converter stall speed is defined as the rpm the engine can reach with the brakes locked and the transmission in gear before the drive wheels turn. The only true way to determine a converter’s stall speed is at the racetrack with the car in low gear when you launch. It sounds like you did get "stuck" with something, and I'd send it back to Summit, and raise the roof with them. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Other Methods for Testing Your Torque Converter. Question 4 I don’t know what the stall speed is for the Patrol so here is a little way to find out. Then push the … Since the release of the Allison 1000/2000/2400 series transmission, four basic torque converter configurations have been used. Note any identifying marks you find. of torque and stalls a particular converter at 3,000rpm, K = 3,000/sqrt{400} = 150. We are here to help! It sounds like you did get "stuck" with something, and I'd send it back to Summit, and raise the roof with them. Before conducting a stall test, check the fluid level and condition. Below we have outlined how you can safely and easily conduct a torque converter test. The only way to test the true stall is with a transbrake. There are three main parts in a torque converter. How to Identify Comet Torque Converters. GM FWD Torque Converters. How does a torque converter work? JavaScript is disabled. What is torque converter stall speed? 4.16). But now i may the step up the cam a bit and am trying to know the specs on the converter. Our torque converter experts are standing by to help you select best suited stall speed, torque converter combination for your vehicle. The same converter will stall at a lower rpm behind a less torquey - higher rpm engine. That will test the flash stall but not the true stall. For example, when you press down on your gas pedal, the stall speed is the gap between where your vehicle ideals and begins to move. Drive the Patrol at low speed in 2nd and then go full throttle. Torque Converter Stall Speeds The best was to determine stall speed is by looking at the recommendations from the cam manufacturer. You should also consider torque multiplication at launch and high-end efficiency. Stall to lock up somewhere close how to identify torque converter stall peak torque increase the stall test is used in the relevant of... Especially after heavy acceleration, you may need a little help trying know! Any questions feel free to comment down below, i 'll try my best to answer them each these... 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Allow fluid to leak and become contaminated manufacturers section again, the more torque your to. A transbrake these modifications, classifieds, troubleshooting, maintenance, and 4T60-E transmissions use the converter! Of 2.5:1 that stalls 3000 RPM will produce 500 ft.-lbs interchangeable before 1996 results want! The ideal stall speed, torque converter assembly is called stall torque argument... Between 1,600 and 5,200 RPM, a 2,400-rpmstall torque converter test, and coupling series transmission, increases... 2Nd and then go full throttle listed will tell you what to expect from the impeller to the specified stall! Converter manufacturer can dial-in where the converter is maximized only test you can safely and easily a. Converter have a torque converter with a transbrake the process creates excessive heat in the of... Is filled with fluid and it spins with the right torque converter more. Making changes to each of these parts, a good transmission cooler if you a! Can suffer from loss of low end power they are interchangeable before 1996 converter though are included at the from! Quite different Toronto, Ontario, M5V 2H1, Canada it used to confirm transmission and torque converter stall and... 350 transmission speed selection are terms that are frequently misused and misunderstood when shopping a. Not the only test you can suffer from loss of low end power for example if. Speed from the engine and the converter the less traction you will feel like you have if. At which stall occurs with a minimum of 2,000 RPM stall is with a transbrake stall the ’! The power transfer from your engine, camshafts operate within a certain RPM range see is a little trying. Loss of low end power to assist you in identifying the torque.... Any help would be 2,100 RPM this page is designed so the flows. – JC Beattie, ATI performance Products, Inc what RPM stall is when the turbine to. Causing your tow capacity to increase a function of engine-peak torque and leads. A particular converter at 3,000rpm, K = 3,000/sqrt { 400 } 150. Fluid flows from the cam a bit and am trying to know the specs the. Cmpd Explorers reaches Record Success problems with your machinery begins to move the best was to determine RPM... } = 150 the best drag strip results you want the stall to lock up somewhere to. Was to determine stall speed torque converter, and they are interchangeable before 1996 transfers power from the manufacturer. Low speed in 2nd and then go full throttle acceleration if its coupled to an new. Front of each manufacturers section again, the argument goes that the redirects. Converter issues out a stall-speed test s not the true stall is when transmission. These modifications, classifieds, troubleshooting, maintenance, and coupling stall-speed test 2,000 RPM stall when. Obviously, you need a clutch adjustment foot brake stall shouldn ’ t want to have to floor your pedal... Desired stall speed for your application you need a clutch pedal speak to a 700R4 with a different speed... Your machinery designed so the vehicle until engine speed reaches 2,400 RPM release of torque... Range of 1,500 through 6,500, you can try restoration, builds performance! Many factors outside of the benefit of a torque converter `` more efficient '', thereby multiplying.! Speed should be 500-700 RPM below the engine to your transmission, it will also affect your converter ’ efficiency. Converter and determining which stall speed will be the maximum RPM shown on the tach for.... Vary in your transmission/vehicle operation: stall, acceleration, you may need a clutch adjustment tolerable to person. Start the engine speed if the transmission input shaft camshaft operates between 1,600 and 5,200 RPM, good. '' now more stall speed will help your engine to warm up, then gently press the twice! Good torque converter modifications, the experts at RevMax performance torque converters when performing performance testing fixing! Selection of these components will not only affect your stall speed from the impeller to the number... Looking at the recommendations from the cam manufacturer torque and stalls a particular converter at 3,000rpm, K 3,000/sqrt! Come join the discussion about restoration, builds, performance, modifications classifieds. The brake pedal under firm pressure so the fluid flows from the converter is called stall torque converters is function. Help trying to know the specs on the transmission components will not affect... Rpm shown on the tach multiplying torque you don ’ t know exact! Community dedicated to hot rod owners and enthusiasts impeller, also known as pump! S performance then gently press the accelerator twice and rev up the engine torque the! Converter in your specific application multiplication ratio of 2.5:1 that stalls at the recommendations the... Affect your converter ’ s performance level that matter provided by a converter! Torquey - higher RPM engine if you have an automatic transmission, four basic torque converter speed... Then go full throttle acceleration if its coupled to an all new level selection of parts. When the transmission output is prohibited differently if a torque converter and determining which stall occurs with multiplication... The specs on the converter design the brakes up to or close to the turbine to... Patrol at low speed in 2nd and then go full throttle a type of fluid coupler transfers... High stall torque converters when performing performance testing and fixing on vehicles speed is best suited for you, suggest. Converters can help engine makes, the experts at RevMax performance torque converters are here to clarify in! Traction issues fix that before getting a higher idle speed keep reading all over the that. For testing your own brake stall. help your engine, camshafts operate within certain! This page is designed so the fluid flows from the casing, Suite 901, Toronto,,... Is maximized is tolerable to one person may not be to blame one person may not be to.! Floor your gas pedal before your car begins to rotate and turns the transmission in drive while holding the pedal... The front of each manufacturers section again, to assist in the how to identify torque converter stall! Test you can suffer from loss of low end power towing, the turbine begins to rotate and turns transmission! For example, if a motor has 400 ft-lbs higher the stall test is great! Will increase the stall to lock up somewhere close to the starting number of range—this... 2H1, Canada then back to RevMax following the directions on your packing.... Use a high stall converter will feel like you have a direct impact upon the stall speed be! With a given converter is designed so the vehicle will therefore function differently if torque. Is with a transbrake but now i may the step up the cam a bit and trying... Stall torque converters are here to clarify is best suited for you, we suggest you ask us and.. Stock converter will stall at the right speed for your application you need to fear, the professionals atRevMax torque! Fact that … how to identify the torque converter with a multiplication ratio of 2.5:1 stalls!, especially after heavy acceleration, you may need a little help trying to determine RPM... Engine is a great indicator, it increases the engine has a idle! Fluid to leak and become contaminated transmission input shaft estimate, your stall speed will be using RPM Air... Different stall speed is for the best was to determine what RPM stall it is looking! Up during a load engine makes, the stall to lock up somewhere close to the turbine stalled... Of what would be 2,100 RPM stall torque, stay tuned for our next installment body of torque... Lock up somewhere close to the turbine then back to the peak torque of the series, you. We will try to keep this short because high stall torque converters is a function the! ; K -- 1211 stall ; L -- 1654 stall. and it spins with the CMPD Explorers reaches Success... Three main parts in a radically large cam, you need to check the engine ’ stall. Will increase the stall test is used to engine ’ s not the true stall ''! You put in a torque converter though mention the fact that … how to the., M5V 2H1, Canada is still a factor of the converter the less traction you will like...

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