SPLiiX Posted November 9, 2004 Report Share Posted November 9, 2004 I know some are available in some models and not in others etc but what are the difference and would anybody notice by driving it? Link to comment Share on other sites More sharing options...
Chav Posted November 9, 2004 Report Share Posted November 9, 2004 multitronic is CVT so no real gears... as its variable it can use a wider range of ratios that a standard gearbox, and can select any ratio, so even in auto mode can give better economy than a manual. also performance is not affected. CVT in auto mode is extremely smooth. Fun in manual mode if you want to, as you can manually select virtual gear etc DSG uses real gears, but the box can preselect a 2nd gear ready. eg if in 1st, 2nd gear is ready for a rapid change. it has inner/outer cogs etc on a shaft to do this. think a gear change is 0.04 seconds or thereabouts. DSG is a more like a standard automatic box, as uses a torque converter etc. also has tip mode and launch control too (not sure if launch control is on all models though) Link to comment Share on other sites More sharing options...
russellfray Posted November 9, 2004 Report Share Posted November 9, 2004 If there are no real gears in multitronic, how does it actually work?! Would love to see a schematic diagram or something of where the gears would normally be so I can get my head around what my car is doing Link to comment Share on other sites More sharing options...
Chav Posted November 9, 2004 Report Share Posted November 9, 2004 it has a strong chain connecting 2 discs. each disc has 2 sides, the inner faces of which are sloped. as the discs are pushed together the inner radius (where the chain is) increases in effect, thus giving an infinite number of virtual gear ratios. the strength of the disks and chain limits the CVT to the 3.2V6 so far (as in the new A6). when you use the tip mode and select gears this is selecting from some virtual gear ratios that audi have preconfigured. there are no real gears. the fraction of a second it takes to change all it is doing is moving the left/right disks in/out to give the required ratio. it has another benefit of no torque converter, so the CVT versions of models are no slower than the manual ones. its a great compromise, but because it can handle such a wide variety of ratios, it may hold the revs very low in D mode...hence the perceived delay when starting etc. so you either need to floor it (literally...the kickdown feature then enables) or use sport mode or manual mode. i like autos in manual mode...you can change up when you want, and the car will change down for you when stopping at lights etc, so its great for being lazy but still having fun Link to comment Share on other sites More sharing options...
russellfray Posted November 9, 2004 Report Share Posted November 9, 2004 Thanks for that Link to comment Share on other sites More sharing options...
cabby Posted November 9, 2004 Report Share Posted November 9, 2004 Satan, you might want to have a look at this link. It contains some images and a brief description. http://autozine.kyul.net/technical_school/gearbox/tech_gear_cvt.htm Link to comment Share on other sites More sharing options...
russellfray Posted November 9, 2004 Report Share Posted November 9, 2004 Superb... thanks! Link to comment Share on other sites More sharing options...
Mollox Posted November 9, 2004 Report Share Posted November 9, 2004 [ QUOTE ] If there are no real gears in multitronic, how does it actually work?! Would love to see a schematic diagram or something of where the gears would normally be so I can get my head around what my car is doing [/ QUOTE ] Belts, I do believe Link to comment Share on other sites More sharing options...
SPLiiX Posted November 9, 2004 Author Report Share Posted November 9, 2004 Thanks CabrioJ!!! Now I know! Link to comment Share on other sites More sharing options...
Ari Posted November 9, 2004 Report Share Posted November 9, 2004 Also important to know that the DSG is not an automatic transmission, it's an electronically controlled (very advanced) manual transmission. So no torque converter etc, it has a clutch like a manual car, but it is electronically controlled. It does how-ever have an "auto" mode so it will change gear for you like a conventional auto, but this simply means that the electronics are deciding and implementing the manual shifts and of course controlling the clutch on your behalf. Link to comment Share on other sites More sharing options...
Tobes49 Posted November 15, 2004 Report Share Posted November 15, 2004 [ QUOTE ] [ QUOTE ] If there are no real gears in multitronic, how does it actually work?! Would love to see a schematic diagram or something of where the gears would normally be so I can get my head around what my car is doing [/ QUOTE ] Belts, I do believe [/ QUOTE ] Was belts now they use a chain in the new audi's Link to comment Share on other sites More sharing options...
Tobes49 Posted November 15, 2004 Report Share Posted November 15, 2004 [ QUOTE ] Also important to know that the DSG is not an automatic transmission, it's an electronically controlled (very advanced) manual transmission. So no torque converter etc, it has a clutch like a manual car, but it is electronically controlled. It does how-ever have an "auto" mode so it will change gear for you like a conventional auto, but this simply means that the electronics are deciding and implementing the manual shifts and of course controlling the clutch on your behalf. [/ QUOTE ] The DSG uses two wet plate (run in gearbox oil) clutchs that are computer controled, One clutch is linked to 1,3 and 5 gears the second is linked 2,4and6 gear, When your in 1st with clutch one closed (and driving) 2nd gear is engauged but the clutch is held open (not driving) when you want to change gear clutch one opens and clutch 2 shuts. hence the very fast gearchange, Like Ari said there no torque convertor Link to comment Share on other sites More sharing options...
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