can someone thoroughly explain the stall converter
07-09-2007, 01:49 PM
#2
before you post you should read the stickies b/c it explains it all. but ne ways... a stall is only used in an automatic transmission. the converter will not only allow you to launch harder, but it will keep you in your power band with your cam. have you ever seen someone footbrake a car or use a trans brake?? a converter will allow you to bring your rpms up higher for a harder launch. a converter should be one of the first mods i think but they do tend to get expensive. a good company to go with is yank (thats what im going with) performa built (they are coming up very fast and havent heard a bad thing about them) and tci. also w/ a converter you should get a trans cooler. w/o one your trans will heat up very quickly. hope this helped a little but again the stickies will explain it better. oh and with a converter make sure that you pick your cam and converter to work together.
07-10-2007, 02:32 PM
#6
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fuddle makes great convertors
A convertor allows the transmission to somewhat slip until it reaches a certain rpm. This allows someone with a footbrake car to leave at a higher rpm and leave with more power as well as quickly get to a point in the power band where there is a lot of torque present. It also decreases the amount of rpm that is lost during the shifts and maintains a much higher level of rpm.
A convertor allows the transmission to somewhat slip until it reaches a certain rpm. This allows someone with a footbrake car to leave at a higher rpm and leave with more power as well as quickly get to a point in the power band where there is a lot of torque present. It also decreases the amount of rpm that is lost during the shifts and maintains a much higher level of rpm.
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07-10-2007, 06:28 PM
#10
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07-10-2007, 06:57 PM
#11
Ill pimp out one of my favorite sites: http://auto.howstuffworks.com/torque-converter.htm
remember, there are 6 pages in that article, not just the first one...
remember, there are 6 pages in that article, not just the first one...
07-11-2007, 07:12 AM
#12
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STALL SPEED
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", doesn’t shut off just quits revving). 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. Launching at full throttle and observing the peak speed attained at launch determine flash stall. 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.
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", doesn’t shut off just quits revving). 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. Launching at full throttle and observing the peak speed attained at launch determine flash stall. 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.
