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Showing content with the highest reputation on 11/21/2014 in all areas

  1. The Lupo 3L uses an automated 085 manual gearbox See from page 22 onwards http://www.volkspage.net/technik/ssp/ssp/SSP_218.pdf
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  2. Are you gonna be ok??
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  3. Yeah, TIPtronic is a 100% automatic gearbox. The only thing they've done is changed the way they shift- which is down to a different program in the gearbox controller. It is possible to replicate tiptronic and paddleshifting on an 096 or 01M box. I've done it. I have a couple of 096s knocking around for a new project (one's off a corrado VR6 and the other from a 4 cyl 2L). I'm going to combine the geartrain from the 6 with the casting from the 4 pot to run a PDI with paddleshift. No idea when the project will start, but I have all the bits ready to go.... The only difference between the auto box program and the TIPtronic is the shift modulation control. For a hard shift, you want the clutches to engage suddenly (like dumping the clutch). Soft is the opposite. It's all controlled by a PWM signal that varies the current in a control solenoid inside the valve block. This is turn varies the 'shift pressure'. If there is high shift pressure, the little pistons move really quickly (or 'pop') clamping the clutches together quickly, resulting in a hard shift. The old way of doing it was with a 'modulator' which was controlled by vacuum on a petrol engine. High vacuum means slight throttle, which in turn means the driver is not gunning it, so the shift needs to be gentle. It's all common sense stuff when you think about it. DSG and Auto can result in equal powertrain loss, depending on how they are configured. The biggest loss in an Auto is with the running pump, but that can be tweaked to be efficient once in lockup. A lock up torque convertor transmits all the power straight through. In a DSG, the loss is from all the bearings and shafts slushing around with the oil. There are a lot more shafts and gears moving, resulting in more friction. A small manual box is still the most efficient when driven correctly (The Smart car- with computer controlled gear changes on a manual!). Nice pic of a Tiptronic:
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