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bowfer, certainly you can then explain, why some engines aren't sold in every country then?-)
And of course, you can explain us also why knocking sensors are in the car, if they're ineffective? And why advanced ECU, if they can't do anything about the fuel quality?
There's certainly a difference, you're talking about 80's technology in this sense, these days car do change their ignition timing, and they do it all the time, for economy and power. Computers in car aren't an accident, if they weren't needed, they wouldn't be there.
- Yak
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Good old Yak - always up for a fight! /ubbthreads/images/graemlins/smile.gif /ubbthreads/images/graemlins/beerchug.gif
Yak I think you are right in some sense, as far as fuel qualities are concerned from country to country. However, within the EU (and certainly within the UK) its fair to assume that fuel standards are very close.
Knocking sensors are generally used as an insurance policy to enable engines to run as advanced timings as possible, without running the risk of detonation. I don't think their primary purpose is to cope with varying fuel qualities, although that may be a useful side effect.
Ignition timings, fuel / air mixes etc are indeed changed all the time by ECUs, but I think you will find this is not because your fuel quality is changing as you drive! It has more to do with engine load, throttle position, engine speed, atomspheric pressure, air temperature etc etc etc.
Lets also remember we are talking about diesel here, and the main selling point of one brand over the other tends to concern additives to the fuel, rather than the quality of the fuel itself. In terms of the enviroment, emmisions, or cleanliness of your injectors, there may be some difference between brands in the UK, but I seriously doubt there is any detectable difference in terms of power gains between them.
I think the best policy is to use the petrol station nearest you at the time your fuel light comes on!
On a lighter note - I have done 542 miles on a tank. Can anyone beat that?
/ubbthreads/images/graemlins/beerchug.gif