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  1. shanba

    Hydraulic valves for transmission control

    Torque converter can use PWM type solenoids that control a signal pressure to the actuating valve. The valves and solenoids are integrated into the valve body or front pump. Most service manuals have hydraulic schematics that can be studied. DSG solenoids are of the VFS type which operate at...
  2. shanba

    GUI & data plotting

    Also, read up on setappdata and getappdata. Very useful in GUI programming.
  3. shanba

    Should I take this job offer?

    Lots of good input here. Another thing to consider. Do you and your wife have family and/or friends that can help out. Having support around will make life easier (esp. for your wife) while you're away on business.
  4. shanba

    How To - Transmission Re-Design

    Look at how all the bearings are fed oil, some may rely on gravity feed in a hole above the bearing. Especially in the ring and pinion area. The transmission and differential breather vent will need to be relocated. Also, seal weep holes will be below the seals, need to investigate allowing...
  5. shanba

    help about matlab's gui

    1) Look up imread.m 2) Not sure 3) The pushbutton 'Callback' property is used to assign the action the program will execute when pressing the button. I suggest assigning a new function in the Callback that opens your new window.
  6. shanba

    Where to start - Van Diemen Formula Ford

    You didn't mention where you are racing. UK, USA, Canada and Australia, among others, all have slightly different packages, especially tires and shocks. Have you had the shocks dyno'd? Shock guys can be informative with set-up issues and tell you a range of spring rates the shocks are good...
  7. shanba

    4L60-E Tie-up when shifting to 4th (Overdrive)

    I was referring to the forward friction clutch. The forward sprag clutch is a one-way clutch device. If it is locked up (not free wheeling), than the clutch timing becomes much more significant to shift feel. This could be the issue. The forward friction clutch release timing is not...
  8. shanba

    4L60-E Tie-up when shifting to 4th (Overdrive)

    The forward clutch is not releasing properly, or the 2-4 band is coming on too aggressively.
  9. shanba

    Cooling Automatic transmissions.

    The oil going through the cooler not provides bearing lube, but also lube to all the clutches. In addition to the TC, the clutches also heat up the oil tremedously during shifts, especially heavy throttle while towing. Reducing the oil flow through the coolers will hurt the flow available for...
  10. shanba

    What are the real efficiency losses in IC?

    BMW has announced a system to recover some of this exhaust energy and do work directly on the crankshaft. They use steam as a energy transfer media. http://www.greencarcongress.com/2005/12/bmw_developing_.html
  11. shanba

    exact gear ratio applications

    Another area to look at in gearing is running an engine in its most efficient RPM/load to maximize the powertrain efficiency, assuming the vehicle speed is known or constant.
  12. shanba

    Force multiplication of PS

    I think the spool valve and shaft tune the on-center feel and gain of the system. The line pressure will affect the effort of the whole system, and the spool valve and shaft would be re-tuned to get on-center feel back.
  13. shanba

    Delay - yaw velocity to lateral acceleration

    Rear steer effects are designed into pass car IRS suspension through bushing tuning to get a similar response. The range of tunability just isn't as great as the 4WS system, obviously.
  14. shanba

    Delay - yaw velocity to lateral acceleration

    Another factor I think is this. The front tires create the initial yaw moment on the sprung mass. Before the lat accel is present, the rear must react this change in direction request from the front. Once the rear starts to react this yaw moment, then the sprung mass accelerates at the given...
  15. shanba

    Delay - yaw velocity to lateral acceleration

    I would think its due to the elasticity of the system. If it were rigid, the delay would be much less.
  16. shanba

    Comments on: RevoKnuckle

    In their picture, it looks like the CV boot is/maybe rubbing on the upright assembly.
  17. shanba

    Comments on: RevoKnuckle

    The half-shaft must have more length change and angle due to the greater distance between kingpin and CV joint center. Caster can be tuned within the knuckle, would allow the top of the strut to be moved forward for more cabin space, or allow more caster for a given package. Interesting...
  18. shanba

    Tyre vertical and lateral stiffness data

    I have heard of NASCAR types changing pinion angle of the beam axle to tune drive torque load transfer off the corners.
  19. shanba

    Tyre vertical and lateral stiffness data

    When cornering, the outside tires, front and rear, are at or near their limit. If the car is perfectly balanced with no throttle applied, both front and rear are at their limit. Any addition of throttle, and hence forward thrust will cause the rear tire loading to go beyond its capability and...
  20. shanba

    wider is better? or not? size of contact patch arguement

    Remember too that there are three tire/road interactions that generate total tire grip, it is not just the coefficient of friction * normal force. There is material deformation over the road surface at the localized level (softer rubber = more grip), and hysteresis of the compound as it slides...

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