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blackbeast ss

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Posts posted by blackbeast ss

  3. Servos

    in AWD, Differential, & Transmission Tech

    Posted

    I hate asking easy questions but I was taught any question is a good question if your serious. anyway how do servos work and what do they do? I'm pretty much dead in the water when it comes to transmissions.

     

     

    heres some good info

     

     

    The Torque Converter

    The key to the modern automatic transmission is the torque converter. It takes the place of a clutch in a manual transmission.

     

    A direct descendant of an earlier component called a fluid coupling, the torque converter offers the advantage of multiplying the turning power provided by the engine. It is connected to the motor by means of a metal rod known as the transmission shaft (sometimes called the input shaft), which fits next to but does not touch the engine crankshaft. Repeat: there is no direct connection between the engine and the transmission.

     

    Instead, the engine turns the transmission by means of a process called hydraulic coupling.

     

    Think of two electric fans in a room. Line them up a few feet apart, one in front of the other, both facing the same direction. Now turn on the rear fan. What happens? If you've turned the fan up high enough, and if the fans are close enough together, the front fan will begin to turn as well. In this same manner does the engine crankshaft influence the transmission shaft, causing it to rotate.

     

    The identical process occurs in a torque converter, except that transmission fluid takes the place of air.

     

    But there's more. Inside the torque converter are several components that help multiply the power. These are the impeller (or pump), the turbine, and the stator (or guide wheel).

     

    A torque converter is like a giant doughnut. The impeller and the turbine (the two fans in the analogy above) face one another inside the round metal casing. The impeller is on the engine side, the turbine on the tranny side. Both of these components have blades that catch the transmission fluid and cause them to spin.

     

    Picture two halves of a chambered nautilus, and this will perhaps give you a better image.

     

    As one fan begins to spin, the other will spin as well. Through centrifugal force, the fluid moves to the outside of the blades, where it is redirected by a third fan, called a stator, back to the turbine side. This continual flow of fluid is what causes the power to be multiplied.

     

     

    The Lockup Torque Converter

    Because the only connection between two sides of a torque converter is a fluid connection, there is always a little slippage, running from about 2-8%. To increase efficiency and gas mileage, most modern automatic transmissions also have something called a lockup clutch (aka, torque converter clutch).

     

    It works like this. As the speed of the car nears 40 miles per hour, the highly pressurized transmission fluid is channeled through the transmission shaft and activates a clutch piston. This metal pin locks the turbine to the impeller, in effect bypassing the torque converter. It remains this way until the vehicle slows below 40 mph, at which point the clutch piston disengages and the torque converter kicks in again. Simple, right?

     

     

    Planetary Gearsets

    No, we're not talking Mars and Venus here. These are different-sized gears, just like the ones on the back of your mountain bike. They're called planetary because they're circular and revolve around a central gear known as a sun gear. If it sounds like our solar system, you're right -- it's designed on the same model.

     

    A planetary gearset system has three major elements:

    Sun gear

     

    Planet carrier, drum, and pistons

     

    Ring gear and drum

     

    Although there are different variations on the planetary gearset theme (for instance, some trannies have two sets of planetary gears, two sun gears, etc.), the essential design has remained unchanged for more than half a century.

     

    One example is the Simpson geartrain. In this design, two sets of planetary gearsets mesh with two sun gears. The two sun gears are in turn connected together to form what is called a common sun gear.

     

    The Simpson geartrain is an older, three-speed design no longer in popular use, but it will give us an idea of the way an automatic transmission works.

     

    In neutral, with the exception of the free-turning input shaft, there is no motion within the transmission.

     

    In first gear, the front planetary gear is engaged, locking onto the input shaft. Think of this as the low gear on your bicycle. The gear ratio here is 2.46:1. This gets the car moving.

     

    Once the car is rolling, the transmission shifts into second. The intermediate band is applied, holding stationary the high clutch drum, the reverse clutch, and the sun gear. The forward clutch is applied, locking the input shaft to the ring gear. The gear ratio here is 1.46:1.

     

    In high gear, the ratio goes to 1:1. All planetary gear members are locked to each other and to the output shaft.

     

    In reverse mode, the reverse and high clutch is applied. The input shaft is locked to the reverse and high clutch drum, the input shell, and the sun gear. Gear ratio for reverse is 2.17:1.

     

    These are the basic workings or a Simpson transmission.

     

     

    Clutches, Bands, and Servo Pistons

    Gear shifting in an automatic transmission is very similar to the action taken while riding your mountain bike -- except that a series of valves, sensors, and other components take the place of your brain, deciding when to upshift and downshift to a larger or smaller gear.

     

    Some cars use a multiple-disc clutch operation. In this setup, a series of friction discs are placed between steel plates. The clutch also has a piston and return springs. This whole assembly is known as a clutch pack. When fluid pressure is applied to the clutch pack, the piston engages, locking the assembly together and driving the wheels. When pressure releases (for instance, the engine goes to idle), the piston disengages and the wheels stop turning.

     

    Other cars use transmission bands. In this design, a flexible metal ring fits around the outside of the clutch housing. It tightens to engage the gears, and loosens to release them. This type of transmission also uses a servo piston to activate and deactivate the bands.

     

    The transmission is connected to the wheels via an output shaft, which meshes to the axles in a variety of ways, depending on your car's design. The transmission turns the output shaft, which in turn spins the axles, which in turn make the wheels go. There are a myriad of ways to do this. Since you can have a front- or rear-wheel drive car, and since engines can be located in the front, rear, or even middle of the vehicle, the engineering choices are infinite. Suffice it to say, the axles drive the wheels.

     

    Many modern front-wheel-drive cars use an assembly called a transaxle, which saves weight (thereby increasing mileage) and space. The transaxle houses the transmission and the axles in a single unit that weds to the engine.

  5. Need Replacement Cats

    in Bolt On Performance

    Posted

    I belive cats are mandated to be warrantyed by federal law for somthing like 80 thousand miles or somthing. I think its somthing close to that. you should be able to get it replaced under warranty* federal mandate*, specailly if your truck is stock. Dealer should replace it with no out of pocket cost to you

    :withstupid::withstupid::withstupid:

  6. New Pb

    in Strip

    Posted

    Nice times for being 100+*. I'm not a believer in the corrected times BS....You run what you run, just my opinion.

    good runs bro :driving: ...............but :withstupid::withstupid: you run what you run,you dont see the NHRA drivers correcting their time :jester:

  8. Video I Cant Find

    in Off-Topic/General

    Posted

    ok i saw this video a while back. it was a video on a bunch of illegals in the back of a toyota pick up. the yota pickup all of a sudden rolled and ejected a lot of people. does anyone know where the vid is on this sight?

    happysad.gifthumb.gif

    how are they illegal if their in their country??

  12. Fs Kicker Solo Beric S8L7

    in For Sale/ Wanted

    Posted

    thanks bro.......ups delivered my l7 8inch 4ohm yesterday and installed in a mfd 3/4 board with Polly fill box that i made for under the rear seat and dammmmmmmmm this little thing kicks hard i could fell this thing kicking my back...................................very very very happy :thumbsup::thumbsup:

    the reason why I'm selling this one is i wanted a 4ohm not 2 ohm

  16. Fs Kicker Solo Beric S8L7

    in For Sale/ Wanted

    Posted

    I have a new solo beric 8 inch sub woofer for sale i am going a different route asking 140 shipped in usa obo....paid 165 shipped my loss your gain

     

    specs

     

    8" Car audio subwoofer with dual voice coil

     

    Model: 08S8L72 (2-ohm) Solo-Baric

    RMS Power: 450-watts

    PEAK Power: 900-watts

    Impedance: dual 2-ohms

     

    Frequency response: 28Hz - 100Hz

    Sensitivity: 83.6dB

    Mounting cutout: 7-1/4"

    Mounting depth: 4-3/4

     

    erasethese002-1.jpg

    erasethese004.jpg

  19. Ac Pressure

    in General SS

    Posted · Edited by blackbeast ss (see edit history)

    thanks for everyones help, i dropped the pressure to 20 and re-calibrated the mix doors or what ever they are called and all seems to be well except for when i stop and it starts to warm up again. i do have the fan shroud off maybe not enough air across coils was planning on putting e-fans on from FF DYNAMICS anyone ever try these?

    thats normal when its very hot outside and you come to a complete stop, anytime your rpm is below 2k your pressures are gonna drop because the compressor pumps to its full capacity over 2k rpm.so anytime its very hot outside and you come to a complete stop your low pressure drops to about 20 to 35 psi moving your boiling temp and having a wide superheat causing less efficient cooling.thats why on CARs the best way of charging the ac is weigh in the charge.i seen alot of cars that are over charged because they charge the ac system till it starts blowing cold when its in park......wrong way to do it!!! the compressor will fail prematurely due to being overcharged........trust me my trucks ac is charged and running to factory spec and when i come to a stop and its very hot outside it will blow not as cold compared to when im driving....i recommend recovering the refrigerant and weigh in the charge!!!

  23. 124ºf

    in Off-Topic/General

    Posted

    and i'd rather be shooting guns for 12 hrs instead of replacing brakes on a 53' trailer in the middle of nowhere in the desert. as much as i would like to just look at the thermometer while sitting indoors with the a/c on full blast, that's not what i get paid to do. trust me, i'm not complaining, i've just never seen my thermometer that high before...before this, the highest was 119º. after a few summers of working off-site i learned to just ignore the heat when i have to.

     

    i know blackbeast has found his own ways of dealing with the heat here in vegas when climate control is not an option.

    LOL my skin was light brown before the summer now is dark purple hahahaha but yeah theirs ways around it !!! dosxx :drool:

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