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Old 08-12-2009, 06:01 PM   #1
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Torque Converters

All torque converters have a stall speed. however 99.9% of stock torque converters will never be spoken of as a "stall converter". there is no difference in the way a stock converter works and a "stall converter" honestly, a "stall converter" is an oxymoron. all torque converters stall, thats how they work.

Lets start at the beginning of torque converters. The torque converter is nothing more than a fluid coupler that connects the engine crankshaft to the drive shaft using hydraulic fluid (transmission fluid). There is no direct mechanical connection between the crankshaft and the drive shaft in an automatic transmission. This fluid coupling method allows the transmission to shift gears automatically and without breaking any mechanical connection. It does this by monitoring transmission fluid pressures and/or engine vacuum (depending on the transmission). The rpm that the converter stalls at can be varied by any number of methods. Chief among them is the diameter of the converter or the pitch of the stator vanes. A converter that stalls at a higher rpm than the typical "stock" unit could be called a high stall converter. Stall speed varies with engine torque, so a 4000 RPM converter behind a 502 might provide a 1700 RPM stall behind a 283 (which is one thing people dont take into account when they purchase a stall, a "universal" 3000rpm stall will not stall at that speed for every motor).



things to look at:
True Stall: The rpm the engine cannot exceed when the driveline is locked. The most accurate way to determine true stall is by locking First gear and Reverse with a transbrake and observing engine rpm at WOT. (however, most of us dont have a reverse manual valve body and a transbrake to practice this, so we have to rely on the manufacturer's recomendation).

Flash Stall: The rpm the engine “flashes” to when launched from rest at WOT. A converter will often briefly flash to a higher rpm than its true stall speed. This is due to the fact that when you go to WOT, the transmission builds pressure faster than when you gradually "stall up". and basically "overstalls" the converter before you launch.

Brake Stall: The rpm the engine cannot exceed with the brakes locked and the driveshaft not spinning. Brake stall isn’t usually an accurate measuring tool since the engine often overpowers the wheels before the true stall speed is reached.


now, those are all things about how converters work...now why would you want one that stalls higher than stock?


Advantages of a higher stall converter include: More torque multiplication which means better acceleration. An engine that is set up with a high rpm cam produces poor low speed torque and usually idles at a higher than normal speed. A higher stall converter slips more at idle speeds and eliminates idle creep along with allowing the engine to wind up into its power band when launching. A high stall converter is usually smaller and lighter, producing less flywheel effect and faster rpm gain. In short, your engine will idle easier and rev quicker.

Disadvantages include heat. High stall converters are less efficient at transmitting power and the wasted energy turns up as heat. You can expect your fuel mileage to go down especially in town.

Another factor that gets confusing is converter slip. Slip is basically a measure of converter efficiency. Due to the difference in rotating speeds between the impeller and the turbine, there is usually a five to 10 percent efficiency loss at cruising speeds for non-lockup converters. Because a converter gradually slips, or creeps up, to full stall/lockup rpm, the higher the stall speed, the more slippage you get. On a street-driven vehicle, that can lead to poor idle and low end performance, worse gas mileage, and most importantly, greater heat buildup-the number one killer of converters and transmissions. If you do run a high stall converter, a good transmission cooler is a must.


Unless you have years of experience in the field, it’s nearly impossible to predict precisely how an individual torque converter will behave in your own car. Things like upgraded Torrington bearings and furnace-brazed fins come to play, an 11-inch 3,000 converter vs a 10-inch converter and which is better for your application.


and cus im lazy, here's a link with more info on how converters work, inside and out
http://www.kennedysdynotune.com/Torq...ter%20Tech.htm




If you run an oddball combination of parts, don’t be surprised if a tech guy recommends a custom-built converter. Although companies like TCI and B&M believe an off-the-shelf converter will suit 90 percent of their customers, remember that even these ready-to-ship converters have been designed for common yet specific engine/vehicle applications. But while a mild 350 in a ’78 Camaro is an easy application to match up, there’s probably no converter ready to install behind a twin-turbo 400ci ’68 Caprice.

most manufacturers dont usually recommend anything less than a mid-level Heavy Duty Super Torque converter. the best philosophy is, “You get what you pay for. Why back a $16,000 engine with a cheap converter?”

i've used off-the-shelf converters in a myriad of cars; sometimes they work wonderfully, and sometimes they’re less than great. Custom converters built for specific cars have always been dynamite. although the high list price hurts a little, its worth paying to know that what you are putting into the car is going to last thru the abuse.

When a converter company quotes you a stall speed, verify whether it’s flash stall or true stall. Most converter companies quote flash stall figures. Many factors determine where the converter will flash stall once its installed in your car. Heavy cars with tall (numerically low) gears and large-diameter tires offer more resistance to forward motion, so the converter will stall at a higher rpm than it would in a light car with steep gears and short tires. The easier the motor can accelerate the vehicle, the lower the converter will need to stall to get the car moving.




Anti-balloon plates.

These are primarily used with nitrous setups as the more horsepower you have, the more cover pump pressure there is. With enough pressure your converter will balloon. Pump pressure drives the impeller hub into your transmission pump causing the pump to fail. It also creates bearing endplay creating premature converter failure. When the converter balloons, it loses the dynamic flow through your converter, resulting in loss of efficiency and horsepower. Anti Ballooning flanged hubs keep the converter from expanding outward. The converter will actually become longer from front to rear when it balloons.



some more stuff

Disclaimer: This is from a "hobbyist" point of view, and although I do my own work and have personal experience I am by no means a professional mechanic. I tried to keep everything as factual as possible, but like any piece of writing some opinion my always invoulunterily be snuck in. To be blunt: I am not responsible if you choose the totally wrong stall and your car is a turd!

I am going to start from the top and explain everything as best as I can.

What is a Torque Converter, or "Stall"?
The proper name is a "Torque Converter", but I will refer to it as simply a "stall" for simplicity and popularities sake. The stall converter is the piece inside an automatic transmission that not only transfers, but multiplies the output of the engine and sends it out the transmission. It is basically a fluid coupler, which can engage and disengage the connection between your engine and transmission. Stalls are rated by their "Stall Rating", which can be a bit confusing and cannot always be compared. This is because while some companies rate their stalls by their "flash stall"(I'll get into that later...), others are rated by their significantly lower "brake stall"(more on that later too!). To add more confusion to the mix, how a stall acts in a car will depend a lot on the cars torque peak, power curves, and even how sticky your tires are. A stall rated as a 2800 for a stocker can stall much higher on a higly modified car!

Cam surge??? One reason to get a stall...
Cam surge is the jumping variation in idle that most cam'd cars have. With a tight converter, naturally the car will buck forward everytime the idle twitches, since the connection between the engine and driveshaft is fully engaged at lower rpms. This is not as serious an issue for a manual car, since with the clutch held down the connection between the engine and drivetrain is completely seperated. You can rev the car at will and it will not move. With an automatic though, the connection is still there in varying degrees as long as you are in gear. With a larger(more loose) converter the idle will still jump due to the cam, but the car will not buck and move as much because of the stall "eating" the low rpm changes by allowing the connection between the engine and drivetrain to slip at lower rpms. The rpms twitch, but it will not be transfered to the drive wheels and push against your brakes

Brake Stalling! More RPMs off the line!
Also, when you hold the brake and then apply gas to get the rpms up from a standstill, a stalled car will brake stall much higher then a stocker. You can bring it up to higher rpms before your tires start to brake loose and spin. It has been a while, but I believe my stock stall would start to spin the tires at around 1.5k rpms if I held the brake. With a bigger stall, if I hold the brake firmly and slowly give it gas I can bring the rpms up to 2800-3k rpms. Usually you can bring the rpms up to a bit lower then the stall rating, but brake stall is highly dependent on engine torque and tires used. This is very helpful on the street, where full on "flash" launches will just result in tire spin. You can brake stall to where your tires still have traction, then let off the brake while gradually leaning into the throttle to prevent wheelspin.

...but we want SPEED! A stalls true potential...
The real benefit though is the amazing launching and shifting it gives an automatic car. When properly matched to the cam and heads, when you punch the gas you will instantly be in your cars power band - and equally importantly stay there. The drop in rpm's during every upshift at WOT will dissapear, keeping you right where you want to be for the whole run - no rowing through the gears and climbing/falling rpms like a manual. Partial throttle drivability will barely be affected with a good quality stall, and gas mileage should not change much assuming you do not have a heavy foot. A full .5 off the 1/4 is common with a good quality 3k+ stall.

How will all that all effect ME? A stall in action...
As a real life example, I've ran a 3200 level two "Performance" stall from fuddle racing. Unlike many people think of larger stalls that you cannot move until the stall rating, it still pulls against the brakes and I can still idle crawl at a lumpy 600rpm idle and do not need much throttle to get going on a flat road. Uphill you can def feel the difference though, and if it is a steep hill the car can actually roll backwards in gear if you let go of the brake - just like holding the clutch in on a manual, since the connection between the engine and drivetrain is not strong enough to overcome the weight of the car pulling backwards. If I accelerate normally the car will stay at low rpms rising pretty typically and dropping rpms between gears like a stock car. At 40mph most stalls will lockup(no more slipping), and it will act totally normal and have no difference in gas consumption during lockup driving. If I punch the gas from a stand still though(theoretically of course - I have zero traction on the street ) the rpms instantly flash to ~3400rpms and climb very quickly from there. Flash stall is usually a bit higher then rated stall, and always higher then foot brake stall - but again the stall rating you get from a particular stall will vary on your power level and torque curve(This is why a stall should be custom ordered for your setup and horsepower levels, since more hp and tq will raise a stalls rating in your car.) I do not have to worry about chugging past 1k-3k rpms before reaching peak acceleration, since I start right up in my power band. Then, if I am still WOT, when the car upshifts the rpm's will barely drop any - keeping me in my powerband still but in a higher gear. Your rpms will not drop down as much and make you start the rpm climb all over again.

So just grab one and go? Not all Stalls are created equal...
Notice how much I use "good quality" to describe a stall. A cheapo TCI, B&M, or budget restalled stocker will do nothing but slip like crazy, feel extremely loose on the street, make a ton of heat, and kill your ET's and your rwhp. Nobody I have ever seen that has actually used one has had a complaint that I know of, even people who are coming from other big brand stalls. I have driven cars with both TCI's and Edge stalls before, and the TCI felt extremely loose for its rating but the edge seemed at least on par with the fuddle, but is around 50 bucks more. Yank is widely regarded as the "top dog", but costs quite a bit. My shop had recommended Yank, Vigi, or Fuddle stalls when I was shopping around for one(in that order). They did not say Edge, but they are also great track proven stalls. Stick with those four for most street/strip stalls and you will not be dissapointed! There are then the ultra high performance race orientated stalls like neil chance and such, but that is getting into the high $$$ not very street friendly stuff - springless WOT lockup is INTENSE!

What's the difference???
Stalls have a lot of features that cannot be overlooked when selecting. A few of them are:

Stall Rating:
Like I said, some manufacturers rate this differently then others. It id best to get in touch with them and ask if it is flash or brake stall, and at what hp/tq level it is rated at.
Best bet? Get a dyno run in! Most shops only charge 65-65 bucks for multiple runs with A/F, and it really is needed to choose the proper stall. Again, its 300-600 below peak torque for a DD or car that sees a lot of street duty, and up to 200rpm below peak torque for more "racey" applications.

Diameter:
To put it in short words, smaller is better to a point. This is helpful in different ways. A smaller stall of the same rating will feel "tighter" on the street, and be mroe fun to put around town in. There is less fluid needed to engage it(its a fluid coupler!), which means less drag. Also, they are a lot lighter - which means not only weight off the car but less rotating mass hanging off your flywheel. This means quicker, more crisp rpms! Be careful though - in general, the smaller the stall, the higher the stall rating will be. There is no point in overshooting your peak power rpms, and the proper stall for a street car should be anywhere from 400-600 rpm below peak torque, based on driver preferance and what you consider "streetable". In a more serious racing application you can go up to 200rpm below peak torque to really stay in your power band.

Clutch plates:
This information can be harder to find. The size and material of the clutch in a stall is very important! Some stalls may give their "slipping" by just having a cheap clutch that cannot hold up to much power. This not only adds a ton of drivetrain loss, but makes a ton of heat and kills your times.

Anti-ballooning plates:
Neccesity for nitrous users. Nitrous hits HARD, and can wreak havoc on your drivetrain and transmission. You need a stall that will not expand under the stress!

STR:
Stall Torque Ratio. A very misleading way stalls are rated, this is supposedly a rating of the multiplication ability of the stall. Different companies use different methods to find this number, but most range from 1.9-~2.2. It is often "guesstimated", and no street converter will EVER have an STR much over 2.2...some cheapos are advertised as 2.5 or even 2.7, but that amount of STR is reserved for all but the stoutest springless racing converters. Pure BS, careful here! This is why brand choice is so critical in choosing a stall.

Lockup:
Most modern stall offer this, and IMO is a necessity for a street driven car. At a certain speed, the computer commands the transmission to lock the converter. This eliminates slip, and greatly improves gas mileage. Unlocked stalls will dyno lower due to more slipping, but can run quicker times in the right setup by allowing higher average rpms during a run.


...is that all? What else is needed?
You cannot just throw in a high stall and call it a day! The stall works its magic by intentionally slipping! This adds a lot of heat to the transmission fluid, and can cook one after too much use - especially stop/go traffic and unlocked cruising speeds. A transmission cooler is mandatory, and NO the factory crap is not enough! Luckily, it is a very easy install thanks to the factory lines being easily accessable, and you can snag a huge GVW RV rated universal transmission cooler for a couple bucks at most auto part stores. Get the biggest one you can get your hands on - mine was like 30 bucks and rated for something crazy like 25,000 GVW. A good transmission cooler is essential to extend the life of your transmission! The internet is your friend - there are a ton of guides on installing one.

Of course there is a lot more to stalls - they will literally make one of the biggest differences in an autos ET when changed. That is the basics though, and should help someone in understanding their benefits and why they are needed in a cammed car.

Any questions/spelling errors/etc dont hesitate to PM me!


and some more reading...

http://www.autoshop101.com/forms/AT02.pdf
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Old 08-12-2009, 06:03 PM   #2
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Old 08-12-2009, 07:29 PM   #3
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and this is from a PM between me and Kyle2k.
basically reiterating the points above...

Quote:
Torque converter stall is a commonly used term and is commonly misunderstood. Stall is the speed at which the converter will hold the engine speed and not allow further gain (i.e., the engine "stalls"). The key word here is engine. The speed at which stall occurs with a given converter is a function of engine peak torque. It is clear that the stall speed on a given converter will not be the same coupled to a tame small block engine when compared to a big block with all of the muscle features added. When comparing stall speeds it is important to account for the engine that drives it. True converter stall can best be determined when a Transbrake is used. Testing for stall value by locking the wheel brakes generally does not produce a true stall value because the engine power can often cause wheel turn by overpowering the brakes. Stall speed determined by this method should be identified as such when discussing stall speed determination. Flash stall is determined by launching at full throttle and observing the peak speed attained at launch. Selection of the right stall speed for your vehicle should be matched to the engine peak torque, engine torque curve shape and vehicle weight. In general, the stall speed selected for your converter would be 500 to 700 rpm below the peak torque. This speed allows the margin for application of the torque reserve on takeoff. When selecting stall speed without having prior experience to go by, it is better to conservatively estimate the engine torque than it is to over estimate it. If you over estimate the torque output you will have a converter with a stall speed too low, making your car slow off the line and have slow ET. A properly selected stall speed will give you better launch and better ET. You can see why it is important to consult with professionals prior to making a stall speed selection. Within the converter, stall speed is balanced off against inefficiency after launch. Getting desired stall at the expense of performance after launch is just as costly as improper stall speed to begin. The optimum converter has careful selection and design of changes to the impeller, turbine and stator. Stall speed should be matched to engine performance, the car weight, tire size and gear ratio. Proper selection of stall spec will make for quicker launch, better 60 ft. time and better ET. It is very important that these parameters be specified when ordering a converter to assure satisfaction. Engine output is what really determines stall speed for a given converter. For this reason the converter you have been using may not be adequate when you improve performance of your engine. This is particularly true in using an improved camshaft. Improving heads, carburetion, installing turbos or manifolds can all affect stall speed. Remember, you want to have stall speed matched to your particular car combination. While stall speed is very important it is by no means the only consideration when selecting a converter. Torque multiplication at launch and high end efficiency are equally important. Stall speed can be attained in many ways that cripple the converter in other ways. Stall speed can be obtained at the expense of looseness at low speeds and loss of performance at higher speeds after launch. You want a converter that produces the right stall without sacrificing performance down the street or down the strip. Normal driving is not affected by stall speeds up to approximately 3000 RPM, particularly with a good converter. A car will begin to roll normally when a higher stall speed converter is used. Quick acceleration will be favorably influenced by stall speed. A very high stall speed (above 3000 RPM) would not be satisfactory for street use. An additional oil cooler is not required for high performance converters used in typical street or strip applications although added cooling is a good thing and is recommended. Care should always be exercised when runup is made at the start line. Any excess time at stall puts the converter at risk due to heat build up. This type of heat buildup would not be saved with a cooler due to the time involved to get rid of the heat. If a vehicle is to be used in towing, an added cooler is a must. However, for normal use, added cooling is not required. The better the converter is designed, the more efficient it will be and the lower the amount of heat that is generated.
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Old 08-12-2009, 07:36 PM   #4
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what doesn't this site have!! I love learning new stuff!!!
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Old 08-12-2009, 07:39 PM   #5
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Old 08-19-2009, 04:34 PM   #6
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some more info added
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Old 04-30-2010, 10:00 PM   #7
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Awesome Info!!
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Old 06-16-2010, 08:22 PM   #8
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Great info Spike! As you can see from my build info below I have a PTC converter. At lower acceleration the transmission is a bit more squirley and seems to hunt. When you go hard throttle it is very crisp. I understand that the stock converter is a bit looser and is designed for smoother shifts. My question is should I be experiencing what I am with this higher performance converter. I honestly don't know what the stall is (long story that I will share later) but I believe it is a 10" Lock up. It's almost like it wants to shift and then stalls a bit. Help a rookie out brother!
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Old 11-01-2010, 08:34 AM   #9
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2011 2SS Hello: I have a question about my car. Since the first miles on the car it seems to have a flutter...(diffilcult to discribe) Flutter in high gear. 6 Speed automatic and once it reaches high gear with no load a fluttering sound emits from the exhaust and the gas pedal feal is not normal. If add or subtract pressure from the pedal the "flutter" goes away.
Manual shifting is much better and by going up the shift pattern and keeping the RPM'S under two thousand and not going into M6 until I reach 60MPH the flutter will go away....Is this something I should be concerned about? I wish I could discribe it better. Thanks for any answer.
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Old 11-30-2010, 01:21 PM   #10
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Thanks for this great info. I think a torque converter is next on my list... I have to decide if I want to do a cam at the same time. Much to learn.
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Old 01-12-2011, 03:12 PM   #11
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Thanks for the info. Alot of that crap I didnt know.
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Old 01-17-2011, 01:55 PM   #12
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Thanks for this great info. I think a torque converter is next on my list... I have to decide if I want to do a cam at the same time. Much to learn.
I would do the cam and then the stall.

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Old 02-24-2011, 03:56 AM   #13
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convertor

Quote:
Originally Posted by CamaroSpike23 View Post
This is from a PM I sent to Dragoneye a little over a year ago modified a tad





some more stuff




and some more reading...

http://www.autoshop101.com/forms/AT02.pdf
Great read thanks
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Old 02-24-2011, 04:15 AM   #14
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Great info thx
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