As you are well aware, you decide on a tuning box over a remap
With all the tech on the new cars, they learn to adjust to your driving styles. Which means it will over compensate for a tuning box & limit the power. Newer diesels have a lambda sensor just like petrols.
Any decent tuner will confirm this. And the not flagged by a dealer is complete rubbish.
Both a remap & tunning will leave a trace.
Rappy
But all dealers can't find the clues of tuning
As you are well aware, you decide on a tuning box over a remap
With all the tech on the new cars, they learn to adjust to your driving styles. Which means it will over compensate for a tuning box & limit the power. Newer diesels have a lambda sensor just like petrols.
Any decent tuner will confirm this. And the not flagged by a dealer is complete rubbish.
Both a remap & tunning will leave a trace.
Rappy
Not you personally, but you hear various false claims. The dealer cant tell etc....
Pleased to hear you are engineer by trade.
So a lambda sensor constantly measures the fuel, air mixtute & boost. By adding a tuning box it fools all these variables. But the Lambda sensor will send these high readings back to the ecu & it will readjust to over come the tuning box.
Over a period of time the car will go back to stock. It will be a gradual thing & I doubt you would notice.
The only way 100% proof would be to put a car on the rollers day 1 & day 365. I guarantee you would see a drop.
Also, tuning boxes are not a good thing as they make the car run far to rich, which can damage the engine & cause you too loose bhp.
Rappy
The golden rule applies here: If it aint moved for 5 minutes, don't shag it!
There thread ended
Something like that would be ideal- a sniff over 200bhp is something less than a lot of the claims- far more believable from a Dyno Dynamics RR though...