> summer to reduce risk of "twin-mass flywheel failure",

> which I suppose gave a different ignition advance map at low rpm. I

Possible. It may also have changed more fundamental parts of the ECU code itself.

> wouldn't want to spend £500 UK plus on an upgrade + exhaust, then

> have it all wiped by a dealer download!

It depends a lot on what they download/flash. The ignition/fuel/boost maps are only a few tens of kytes big, while the entire ECU image is several

megabyte. Lots of it is pure code for the microcontroller and areas in memory are reserved for data blocks (like the maps).

But it's always a risk on a flashed ECU upgrade. It can be wiped. On a 'chipped' upgrade the dealer flash would probably fail, which could mean that they either start investigating or (more likely) swap out the entire box. Same result.

If the TME dealer is willing to re-flash your ECU in case the Volvo dealer wipes it (I guess they would simply register you as a customer and the serial number of your ECU to verify), then I'd say you're covered. All you need to check if the Volvo dealer did do anything would be a boost gague.

In the 1 1/2 years I now have my ECU upgrade in my T4 the dealer never did

anything to the ECU.

Bye, Arno.