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Message: <blockquote data-quote="DKNY" data-source="post: 456730" data-attributes="member: 20849">An extract from a  different forum. Bottom line is that you can upgrade the car with the correct re maps being uploaded"That's quite correct - the torque is always the limiting factor in gearbox designs, as it is this twisting force that will ultimately wear down gearboxes. Where manufacturers give nominal torque ratings for their gearboxes (for instance the 400NM for the GA6HP19Z) these ratings are specified with quite considerable tolerances, to ensure that the gearboxes last for the lifetime of the vehicle. In practice of course, automatic gearboxes do fail, but the failure rate has dramatically decreased with the more modern ZF gearboxes compared to the older designs.The most respected tuners - Hartge, Alpina, Carlsson for Mercs, DMS, Dinan, and others - understand that there are inherent limitations in each model car's specification, and will only tune your car within the limits of the mechanical components. Having a tuned remap producing 500NM in your car whose gearbox is only technically rated to 400NM is not so much of a problem, because the tuners 'torque-limit' the output to ensure that there isn't an excess of twist-action under full engine load.Hartge in particular (I can't speak for the others, other than Alpina but that's a completely different story) warranty their remap and components associated with the remap. So in effect if your gearbox fails BECAUSE of the remap, then Hartge will pay for your new gearbox. However of course that depends on whether it can be proved that the gearbox failed due to the extra torque, or whether it was just a dodgy gearbox in the first place.Both Hartge and DMS have a very good reputation in remapping - not the cheapest, especially in the case of the Hartge, but they have always been consistently reliable, and have historially shown good backup in the odd-occasion when something goes wrong. For instance, DMS' early remap for the 535d showed a problem when the car was being driven in anger around the Nurburgring - on the long straight two-thirds of the way round, two or three cars developed a gearbox malfunction where it shut down and went into limp mode because of excess torque overload... the cars were taken back to DMS, the gearboxes checked over, and the engine remaps modified to be more linear and less aggressive. New DMS-remapped cars have been going round the 'Ring without any problems whatsoever.The key to remapping is to go to a company who have considerable experience, and who demonstrate an ethos of producing good reliable gains across the board, and not just the biggest numbers possible without paying due consideration to ancillary equipment."</blockquote>

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