6 SPEED DSG
6 SPEED DSG
WHAT IS DSG?
A direct-shift gearbox, commonly abbreviated to DSG, is an electronically controlled dual-clutch multiple-shaft manual gearbox in a transaxle design, without a conventional clutch pedal and with fully automatic or semi-manual control. In simple terms, a DSG is two separate manual gearboxes (and clutches) contained within one housing and working as one unit. By using two independent clutches, a DSG can achieve faster shift times and eliminates the torque converter of a conventional epicyclic automatic transmission.
The internal combustion engine drives two clutch packs. The outer clutch pack drives gears 1, 3, 5 (and 7 when fitted), and reverse — the outer clutch pack has a larger diameter compared to the inner clutch, and can, therefore, handle greater torque loadings. The inner clutch pack drives gears 2, 4, and 6. Instead of a standard large dry single-plate clutch, each clutch pack for the six-speed DSG is a collection of four small wet interleaved clutch plates (similar to a motorcycle wet multi-plate clutch).
Due to space constraints, the two clutch assemblies are concentric, and the shafts within the gearbox are hollow and also concentric. Because the alternate clutch pack’s gear-sets can be pre-selected (predictive shifts enabled via the unloaded section of the gearbox), un-powered time while shifting is avoided because the transmission of torque is simply switched from one clutch-pack to the other.
This means that the DSG takes only about 8 milliseconds to upshift. In comparison, the sequential manual transmission (SMT) in the Ferrari F430 Scuderia takes 60 milliseconds to shift, or 150 milliseconds in the Ferrari Enzo. The quoted time for upshifts is the time the wheels are completely non-powered.
THE MOST COMMON ISSUES WITH
6 SPEED DSG GEARBOX
Issue 1: Damaged mechatronic unit.
One of the most common problems comes from Mechatronic unit. There are a couple of Solenoid valves (pressure valves) which with the time will not work properly.
First signs of problems might occur when gear change. Harsh gear shifts or not engaging gears will indicate a problem with that part. If not replaced on time that might open a chain reaction of faults, which in result will lead to full recon
Issue 2: Faulty clutch.
And the great news here is that you can check it yourself. Only with 6 Speed DSG most of the time, if the clutch is damaged, would make ‘clicking’ noise.
Start the engine, let it idle. When moving selector lever between gears, park and neutral at the most you should hear one click. But, if you can hear it a couple of times that might indicate that clutch is damaged already. This is a good point of reference but bear in mind that is not 100% accurate.
Issue 3: Damaged bearing.
Damage of the bearing can occur when there is low oil in the gearbox. It’s very important to sort out any gearbox leaks as soon as possible. The damaged bearing can also collapse and damage the mechanical side of the gearbox.
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