Righty, here goes.
Veyron gearbox - is a no-no, because apart from the obvious
it uses very different technology. Our Golf gearboxes were designed by BorgWarner, whereas the Veyron uses a Ricardo developed box. So unless you are extremely good with a hacksaw, hammer, and a pair of stilsons, I'd keep well away from the Bugatti parts department!
Porsche - the PDK is alleged to be using the dry-plate single clutch version - so another non-starter.
Hurdy, just to refresh my grey matter, you were getting clutch slip from a standing start? Were you also getting clutch slip throuought the rev range, and through all gears? And how many miles has the car done (in total from new, and roughly how many for the remap etc)?
Picking up on a couple of points in previous posts, the oil pressure does not apply the clamping force for the clutch. It is a good old fashioned coil spring which provides the clamping force, and will suffer from the inherent weaknesses of "spring steel" - heat being a particular problem (open front fog grille thread?
). Basically, excess heat in spring steel will reduce its "spring ability", leading to reduced effectiveness, and therefore weakness of the spring. Regarding the oil pressure, this basically controls lubrication (obviously
), but also controls the release of the clutch - so if there is a need for an increase in oil pressure, then that would imply that they need to overcome stonger clutch clamping springs - so uprated springs would appear to be one answer.
OK, so onto the nitty-gritty (and being as Hurdy is still offline, I'll just have to go on what I can remember where Hurdys probs).
Hurdy, being as you are already experiencing quite severe clutch slip, then your clutch packs, along with the oil need to be replaced ASAP. When clutches (wet or dry) slip, the friction lining can "burn". In wet clutches, this will then contaminate the oil, and if the heat is great enough, the oil will actually start to break down, and turn to solid carbon (which is related to how the Yanks caused the problems in the 1.8 20vT, by using their shyte mineral oil in a "turbo"
). Not good. Also, when mulitplate wet clutches (like motorbike and DSG ones
) are "abused" in any way, the friction plates have a tendancy to literally shed chunks of friction lining, which will end up floating around in the oil, before getting trapped in the filter (if it actually does make it that far). Whilst I'm not intentionally implying that you "abuse" your clutch, Hurdy, your useage is very extreme, with all your 1/4 mile sprints, and even more launch control useage. Unless you go down the strip as though you were "driving Miss Daisy"?
So, with a new clutch and oil required - even the standard OEM clutch with fresh DSG oil and filter
should be a big help, and will probably cure your problems. Though for how long - who knows? Being as the DSG box must be drained of oil and removed from the car to the workbench to change the clutch, it would surely be a good time to fit the Quaiffe. OK, you need to open up the physical casings to gain access to the diff, but this major open surgery would be a one-time-only, fit and forget exercise, because the Quaiffe itself (just like the standard diff) is completely maintenance-free. Fitting the Quaiffe at this time
should have an effect on the clutch durability. OK, just like with the standard diff, the clutch will be taking the same amount of torque, however, the Quaiffe will have a smoothing effect on the clutch, with less "grip-slip-grip-slip" reaction "stresses" from the roadwheels. This should provide a more "linear" stress on the clutch, rather than the "peaks and troughs" stresses which will occur with a conventional open diff.
If/when any uprated clutch packs are developed, then just replacing the clutch pack would be less work, with no need to expose the internals of the gearbox.
Also, advice on maintenance. The standard maintenance for the DSG box is an oil and filter change every 4 years or 40k miles. Not (yet
) knowing how many miles you have done, but guessing by the much shortened life of your clutch, I would seriously recommend changing the DSG oil and filter every year or 10k miles. Sadly, that seems to be the price you might have to pay for putting such extreme amounts of torque through the DSG box.
As a final avenue to explore for independent advice, have you ever tried a company called "inde-tech" -
www.Inde-Tech.co.uk. They really are masters of the Audi "multitronic" CVT gearbox, and might just know about, or have contacts for the DSG.
HTH
