DSG affected by heatwave?

[AdamD]

One of the factors in deciding which gear to use is engine load
When the inlet air temperatures are high the ECU will be managing fuel mixture and advance differently - likely to have less power - that may force the use of a lower gear

This won't be an engine load issue; the DSG holds 5th to 70km/h or above with the lightest throttle application, on flat and even declines.

I'm sure it's not a fault; it's likely to just be a heat management strategy the DSG is employing for whatever reason.

[dArK5HaD0w]

Never had such heat affected issues with my DSG6 (DQ250) in the 5+ years I've owned it.
Still behaves the same in really cold or really hot temps.

.....even before I got the DSG tune.

[AdamD]

Never had such heat affected issues with my DSG6 (DQ250) in the 5+ years I've owned it.
Still behaves the same in really cold or really hot temps.

Yep, seems to be unique to the Mk3.

[manamp27]

Well it happened again today in Sydney's 40 degree heat. Definitely appears to be a characteristic of the car and programmed into the system.

[Spinifex]

I've driven literally dozens of DSGs..........The only time I've experienced this behaviour is in the Skoda.................

It would be interesting to know if this is a specific Skoda programming "feature"..... or perhaps due to physical characteristics of the bodywork?
ie: no air-cooling being focussed to the gearbox/gearbox-cooler?

I assume that since they are effectively Golf's in a bigger body, the engine parameters/programming would be almost identical, except maybe some tweaking of shift-points due to heavier weight on the bigger Skodas?

[dArK5HaD0w]

Yep, seems to be unique to the Mk3.

Both mk2 & mk3 have the same DQ250 DSG6 unit.
The mk3 does however a different TCU programming.
Understandable for the different programs, but strange it would introduce the heat weakness.

[AdamD]

Both mk2 & mk3 have the same DQ250 DSG6 unit.
The mk3 does however a different TCU programming.
Understandable for the different programs, but strange it would introduce the heat weakness.

So do a bunch of VAG cars from 2004 until now. There are hundreds of variations of the DQ250 with its various mechatronic and software combinations. Whilst the physical gearbox itself may be (almost) identical between different vehicles, this doesn't mean the box in totality is identical. This is true of the Mk2 to Mk3, and there's likely to be multiple revisions for each of the Mk2 and Mk3 as well.

I don't see this as a weakness. It's entirely possible that the Octavia behaves this way because it weighs more than the Golf, or is more likely to put more load on the gearbox... Or there may be no fundamental difference between vehicles and they just decided to tune it this way because Skoda is more risk-averse. Who knows.

[woofy]

^ I think the risk adverse is the key thing here. Skoda have repeatedly done things like that to keep up their reliability reputation over the rest of VAG.

[Spinifex]

^ I think the risk adverse is the key thing here. Skoda have repeatedly done things like that to keep up their reliability reputation over the rest of VAG.

And this would be a clear example of the "Simply Clever" thinking business model.

[Mysticality]

Did it in a Superb just now, also.

Worth noting, too, is under-bonnet temps. Going by numbers on my Mk2 Octavia (PolarFIS readouts) the intake temp jumps up to 20^C when you turn the A/C on. Heat coming from the A/C condenser, through the intercooler and radiator being pushed by the fans (which are always on when A/C is on) pushes the Intercooler temperature up so far!
Turn A/C off and temps drop straight away.

Example: 45^C day yesterday, A/C blasting; intake temp read 59.5^C at the most I saw. Thats straight into the engine... Can't think to imagine what the temps of all the other components under there would be; especially whilst being blasted constantly by radiator-heated air; with no other air movement... etc etc

[Jondalar]

I drove my 110 TDI Style in 41-45C yesterday, no DSG issues at all. Covered close to 50km at speeds between 40 and 90km/hr.

[manamp27]

I drove my 110 TDI Style in 41-45C yesterday, no DSG issues at all. Covered close to 50km at speeds between 40 and 90km/hr.

May be specific to 6sp DSG.


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[Jondalar]

May be specific to 6sp DSG.


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The diesel has the same 6 speed DSG as the RS

[h100vw]

The diesel has the same 6 speed DSG as the RS

Yeah it's a DQ250. But not swappable. The ratios and software will be quite different.