They are bolted to the engine and provide a fluid coupling to the transmission. Many people will tend to over cam and carburet their cars, and those people under stall which sucks. Technically stall speed is not just a function of the converter. Normally cruising into the pits, is done with the car idling and in gear. Too low a stall torque converter will not benefit the customer. That’s because engines that produce more low-end torque usually bump the stall speed up in the rpm range. The basic rule of thumb is; if your engine "comes alive" at say, 3,500 RPM, then you want a stall converter with about 3,500 of stall to it. The factory converter, which may stall at 1500rpm behind a stock motor, may well stall at 3000rpm or more behind a blown big block. You are 100 CID light on the stall converter You keep repeating "stock compression" Stock for what? I have a Hughes 4,000 stall for my engine setup .. Same results for two different combos. Stall speed is the speed at which the converter holds back or limits the engine speed if the transmission output is prohibited. What I see is race converters dropping flash stall too much and cheaper converters flashing too high. Good for slightly modified 4x4s and pickups. They only show converters for LT & LS engines. We are trained to provide you with the solutions you need as well as the quality you deserve. You will not get max performance, but you won't until you get everything dialed in. In other words, a car with a 3.73 gear will flash stall a converter at a higher rpm than an identical car with a 4.10 gear. With that, if you take a car with a 2,500 RPM stall converter and you hold your foot on the brake hard, and hit the gas at the same time, (as if you were going to power brake), the "general" RPM in which the tires will break loose is at "about" 2,500 RPM. If a 6000 RPM converter means that the car doesn’t start moving until that RPM then the engine would need to be wound out just to hit 15 MPH, and that isn’t how it works. The camshaft is too large for the convertor or the converter stall is too low for the camshaft. You should keep in mind that if the same type of converter is in a big block that is in a car that is quite heavy or has serious traction, then the torque will drive the stall speed to a higher RPM, while an engine that has less power will do the opposite and it won’t stall the converter out as high. Either we go or we ship through UPS. 20 Most people tend to over cam their cars... and those same people also tend to under stall converter their cars too, which REALLY makes it a complete mess, and want to push through the brakes and surge/buck a lot. A tighter fluid coupling will always translate to a lower stall, but, a lower stall does not always translate to tighter fluid coupling. For example, the stall speed for a given converter would be higher behind a torquey big-block than it would be with a small-block, and higher again if it s pushing a heavy vehicle. Torque Converter Clutch Solenoid Replacement Cost 2021. Stall 2200-2600 rpm This converter is designed for mild street applications. type of brakes — disc or drum … It isn't an exact science as far as an exact stall RPM goes. The basic rule of thumb is; if your engine "comes alive" at say, 3,500 RPM, then you want a stall converter with about 3,500 of stall to it. There are some that believe that stall means that the car won’t move until the engine hits a certain RPM, that isn’t true. mc1996 hyd 5 244 244 318 318 .510 .510 106 112 3200-7000 very rough 817 comment: good for pro, street, bracket, oval racing. And a cam that's way too big is the same soggy feel as too low compression. If you get a quality converter that will yield 7% slippage or less, then that will be much better, (regardless of stall speed rpm choice). If the car has a 350HP engine, then a 2400 RPM stall is best. The total combination, application is what makes the biggest difference. Normally a high stall converter will be able to make enough heat to destroy a transmission if you are holding the line too long at full RPM if the stall speed is higher than 3500RPM. A higher stall torque converter will let your car accelerate better because the car will be taking off at the rpm range where it is making the most power. Getting a tranny cooler is important for any high stall converter. It is all about stall, the biggest benefit you get with a correctly built converter is better fluid coupling that transfers power better instead of spinning it off into heat. It isn’t an exact science as far as finding the exact RPM stall. mc5871 hyd 5 244 254 313 328 .510 .533 107 117 3500-7500 very rough 817 comment: good for pro, street, bracket, oval racing. So in summary the general rules of thumb for selecting a torque converter for a street application are: Select a converter that’s stalls roughly 500 rpm higher than starting rpm of the camshaft, remember converters installed in big block applications typically stall 300 rpm higher than a small block application and always choose a converter that will below the highways cruise rpm. Many performance engines will not have good horsepower until around 3000 RPM, which is why when you have higher HP engine with a large cam, you will need a higher stall speed so that it will be closer to the power band when it takes off, otherwise it will fail and start out slow. 3500 + stall converter. No job is too big or too small and no place is too far. Normally a high stall converter will be able to make enough heat to destroy a transmission if you are holding the line too long at full RPM if the stall speed is higher than 3500RPM. Don't forget, stock converters are around 1600-1800. To choose the right torque converter for your vehicle the stock parts and any alterations and additions should be considered. The rear gear is a 4.10. https://www.badasscars.com/index.cfm/page/ptype=product/product_id=78/category_id=62/mode=prod/prd78.htm. Plain and Simple! A 6000 RPM converter that is behind a stock engine may not go to 6000 RPM because the engine won’t make enough torque to get up to that point because of the load converter. If the converter has a stall of 3,500 RPM, then it would break loose at 3,500 RPM. This won’t get the flash effect whenever the stall converter will flash to when your finger comes off the trans brake. If it requires a 3000 stall or 3600 we can not tune a cam to run, idle etc without it. How Much Does Torque Converter Clutch Solenoid Replacement Cost? For mild performance cars with something like a 350 HP engine, a 2,200 - 2,400 stall is about right. You need to remember, 80% of the race is going to be the first 100ft. Most people tend to over cam their cars... and those same people also tend to under stall converter their cars too, which REALLY makes it a complete mess, and want to push through the brakes and surge/buck a lot. It's all relative to torque, vehicle weight, traction and rear gearing. Stalling means that whenever the car is on the start line, and the trans brake is on, and you hit full throttle, the engine will rev up to 4500 RPM with the car sitting there, so whenever you slip that finger off the trans brake, and the tranny slips out of reverse, the car will launch at 4500 RPM, and a race motor at that RPM is close to hitting the peak torque curve when it leaves the line, which is why you get big wheelies or low 60ft times whenever the traction is good. When your torque converter prevents the power transfer from your engine to your transmission, it increases the engine’s RPM stalls. Loose converters are great when your static compression is way low, or way high. We will try to keep this short because high stall torque converters is a pretty involved subject. A car that has a 6000 RPM stall converter in gear and idling will roll along at about 10 MPH, just like any other car that is in gear with the brake off. The reason that a stall converter works is easy. (i.e. Faster cars will normally have a higher stall speed, especially in a smaller cubic inch engine that doesn’t have a lot of torque displacement. What would be the symptoms of too much stall for an engine combo. If the cam is too big for the converter or if the rear end gear is too low, it will dramatically affect the stall rpm by decreasing it. If the user has an application which requires at least 3000 rpm stall and they purchase a 2000 to 2500 rpm stall range converter, it will normally not even give them the 2000 rpm stall. Gear ratio, cubic inches, weight, and torque have a factor in this. You can reach us at 602-437-2301 or contact us online. I have a big block duster with a 727 running a stock torque converter (I can only brake torque it to about 1200-1400 rpm). Since the converter can efficiently transfer power, this could result in excessive slippage." It is all due to torque, traction, rear gearing, and weight. Basically "stall" means when the torque converter "locks-up" under a load. Most street performance cars running your typical "performance" cam should be running a stall converter in the 2,800 - 3,000 RPM area. As the car goes down the track, if you are making too much power for the converter selected, the converter will slip, and you’ll need to run a tighter converter. We often take torque converters for granted, but their implementation was a tremendous breakthrough in the development of modern automatic transmissions. If the converter has a stall of 3,500 RPM, then it would break loose at 3,500 RPM. You should keep in mind that if the same type of converter is in a big block that is in a car that is quite heavy or has serious traction, then the torque will drive the stall speed to a higher RPM, while an engine that has less power will do the opposite and it won’t stall the converter out as high. Plus, the higher the stall speed, the more heat the converter will make with hydraulic fluid inside of the converter. Race engines will have no power at a low RPM, and will be shy on torque, so the nastier that the engine is, the higher the stall speed will need to be. Plus, the higher the stall speed, the more heat the converter will make with hydraulic fluid inside of the converter. I am looking at aftermarket converters and would like some input on stall speed. If you are needed a 3000 RPM stall, then they will get around 2000 RPM, which doesn’t get it off that starting line. DRIVABILITY of a vehicle with a higher stall speed can be substantially reduced with a poorly designed torque converter. We specialize in building custom highly specialized torque converters for all applications. then a converter in the 3,000 - 3,500 RPM is more suited. An engine that has 1200 RPM will only have about 80 horsepower, but at 2500 RPM it could be up to 200HP; obviously a car will launch easier at 200 HP than one at 80HP. We manufacture them for race, towing, and even higher MPG applications. If converter stall speed is too low, the car will be lazy leaving the line; if too high, there'll be excessive high-gear slippage—either case adds time to your e.t. A normal 3000 RPM converter can flash up to around 5000 RPM once you have launched the car. Goerend 900/400 hands down. If you’re engine creates 500-foot lbs of torque at 4,000 RPM and your goal is to launch as hard as possible from the line, you will want to install a 3,800 – 4,000 RPM stall converter. Most converter shops rate stall speed with a 450 CID engine. The rule of thumb is if the engine is coming alive at 3500 RPM then you want a converter with about 3500 stall to it. How Much Does Torque Converter Replacement Cost? Some people believe that "stall" means the car won't start moving until the engine reaches that particular RPM, and that isn't even close to being true. A torque converter’s flash stall is typically the most accurate rating, as a footbrake stall is dependent upon too many variables. In reality, you can t determine stall speed by pushing hard on the brake and bringing the revs up, as any decent converter will multiply torque so much that it will easily overpower the brakes. If it's way off there it's not going to improve itself. Subscribe to get special offers, free giveaways, and once-in-a-lifetime deals. Resources. If you settle for a cheap $250 converter that exhibits 15+% slippage, (NOT stall speed rpm) then you'll run a big risk of excessive heat even with lower stall speeds. Stalling is when the torque converter locks up during a load. The reason a stall converter works is simple; an engine at 1,200 RPM is only making about 80 or so horsepower (on average), but at 2,500 RPM it could be making 150 to 200 HP, and obviously trying to get a car moving using 150-200 HP is going to be much easier than one trying to launch at 80 HP or so. 2800+ stall converter. IMO it's not too awful bad. Many street performance cars will be running normal performance cam which should have a stall converter of 2800 to 3000 RPM.For the hotter cars that have bigger cams, then a 3500 RPM converter is better. If you have any questions feel free to comment down below, I'll try my best to answer them. Usually I can tell if a converter is going to work based on the combo with only a couple seconds of WOT in 3rd (1:1). This is true for a 3000 RPM converter. Too high of a stall speed will result in the engine reaching its peak power range below the rpm. For example, a torque converter will stall roughly 300-500 rpm higher behind a big block than a small block. Stock cars have anywhere from 1,000 to 1,400 RPM stalls from the factory. When in doubt, it’s best to choose one that’s a little on the looser side that has a higher stall speed.” Caine says a big mistake that racers make is making assumptions based on their car being the same as another at the track. I just put in a C6 with a 3000- 3500 stall TCI. The stall converter enables a vehicle to use its torque curve for launching off the line stronger and better compared to a vehicle with a lower stall. 3500 + stall converter. Sometimes you need a tight converter. If the converter was a 3,500 RPM stall, then it would be at approximately 3,500 RPM in which it forces the tires to break loose. Conversely, the same torque converter will stall at lower speed behind an engine making less low-end torque. Here are my car/engine specs:-.030" over 400 big block-9:1 compression-Edelbrock performer rpm intake w/ 750 Holley vacuum secondary carb I have a 3k stall converter in my Chevelle sandwiched between a big block and a TH350. Most mild race cars will use between 3500 to 4500 stall speeds on average. I would think that the LT style (assuming it is 90's LT style) would work on a Gen 1 SB, but even if it did, the converter in my price range has too low of a stall speed from what I am thinking. I guarantee you that the car with the higher stall converter would come in ahead of the car with the lower stall converter, both off the line and at the big end of the track. How Torque Converters Work, With Pictures & Diagram. Way high, a loose converter helps reduce detonation. Keep in mind, if you put that same converter behind a nasty big block, in a car that has serious traction or is quite heavy, the torque of the engine will drive the stall speed up to a higher RPM, and an engine with less power will have the opposite effect and won't be able to stall the converter out as high. the converter must be designed to work within this range to deliver the best performance results. Claiming a converter has a specific stall point without making reference to the motor it’s behind is misleading, as there are too many variables. Let’s explain this a bit better. But you don't want a stall speed that is too high either. This converter works well in big block applications that are slightly modified and used as a daily driver. If you aren’t able to get off the line, then you will lose the race. Various techniques for coupling the engine to the rest of the drivetrain by electric and vacuum-operated … Torque converters are fascinating. For instance, if you have a car that has a 2,500 RPM stall converter, and then you hold both gas and brake at the same time, like you were going to power brake, then general RPM that the tires will break loose at is going to be 2,500 RPM. Big thing is matching stall to your cam. The camshaft and intake power band are both rated to work at 3,000 rpms - 7,000 rpms .. MY car weighs 3,400 lbs with me in it .. Torque converter Most stock cars will have between 1,000 – 1,400 RPM stalls. This will help pair up the power, transmission, and all variables with the right torque converter that has the proper stall speed for your set up. Most performance engines don't make power until 3,000 or so RPM, hence why when you have a higher horsepower engine with a big cam, you need a higher stall speed so the engine is closer to it's "power band" when taking-off from the line, otherwise it will fall on its face and be a turd off the line. “Try not to pick a torque converter with too low a stall speed. I also have some huge cam's with tiny stall's in my racecars. The car will roll at a lower RPM and may never reach 6000 RPM. Rear tire is 26 inches tall. Too low of a stall speed will result in a bog, and launches will be slow, since the engine will not be in it's usable power range. This mild stall-speed is the choice of many street cruisers. We provide the area with a complete range of torque converters. Lot of the this was found in the article below. It is a pretty complicated process, so I will keep it simple. I'll try to keep it short because it's an involved subject. Our highly-trained professionals have been hand-picked from among the best in the industry. Call us today to find out which torque converter will help you tap into the highest performance, most solid towing, or best gas efficiency possible. Way low, it covers the soggy off-idle. Cruising down the road the converter slips a bit as the rpm range stays usually above 2k and below 3k unless I'm running 60 mph. For hotter cars (street / strip) with bigger cams, etc.