Drive a Zafira 1.6? Get 7 more mpg!
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You could bolt deep blue into the boot if you wanted, the resolution of the sensors such as a crank sensor havent really changed so it would make little difference.
Sure, but that is because it isn't really needed.
What about things like knock detection and the resulting actions (like ignition control). I sound like a broken record, but you failed to answer this last time I mentioned it, too.
What about things like knock detection and the resulting actions (like ignition control). I sound like a broken record, but you failed to answer this last time I mentioned it, too.
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Oh sorry,
Yeah thats a microphone bolted to the block that tells an engine to back off from its ECU calibration when it hears noise in the 6400Hz region.
Thats about it.....
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How does one control a knock sensor?
The calibrations will all be very OEM specific but if you think guaging the threshold of knock has any bearing on the spark timing to achieve maximum cylinder pressures and hence crank torque output then your are barking up the wrong tree. Especially when most maps will be for 95RON it will be a passive system that wont be out hunting for knock so its likely you will never get any sort of situation where knock is observed.
Why throwing 99RON in the tank would change that part of the knock control and hence tweak ignition timing is quite beyond me.
Knock, Knock.
Whos there
Placebo.
The problem now is your getting more from the thread than you deserve and ill probably see all these comments regurgitated in one form or another in the future.
The calibrations will all be very OEM specific but if you think guaging the threshold of knock has any bearing on the spark timing to achieve maximum cylinder pressures and hence crank torque output then your are barking up the wrong tree. Especially when most maps will be for 95RON it will be a passive system that wont be out hunting for knock so its likely you will never get any sort of situation where knock is observed.
Why throwing 99RON in the tank would change that part of the knock control and hence tweak ignition timing is quite beyond me.
Knock, Knock.
Whos there
Placebo.
The problem now is your getting more from the thread than you deserve and ill probably see all these comments regurgitated in one form or another in the future.
What is it you do, Jonny?
It was my understanding that management systems these days do actively look for knock, in the sense that they will attempt to find the optimal advance for the type of fuel used (Before you get pedantic, this is my understanding in the simplest form - I do not wish to complicate it with what could be flawed memories of the intricacies of it).
This isn't something I heard down the pub, either, but rather from a very knowledgeable man who not only maps ecus (as a hobby), but develops software for one of the OEM suppliers. I will be attempting to get back in contact with him, as I'd love to hear his thoughts on this thread.
It was my understanding that management systems these days do actively look for knock, in the sense that they will attempt to find the optimal advance for the type of fuel used (Before you get pedantic, this is my understanding in the simplest form - I do not wish to complicate it with what could be flawed memories of the intricacies of it).
This isn't something I heard down the pub, either, but rather from a very knowledgeable man who not only maps ecus (as a hobby), but develops software for one of the OEM suppliers. I will be attempting to get back in contact with him, as I'd love to hear his thoughts on this thread.
Fantastic contribution - so first I was wrong just because "Science", Now this.
I know I'm not being stupid, because I've seen the gains with my own eyes - I'm not going to disregard this because collectively, the people in this thread think it "doesn't sound right" and the one person who has a clue is being argumentative (You'll notice he still hasn't told me that 21-27MPG is impossible). Not to mention that anyone who does agree with me is very unlikely to post because the of the "ridicule" I'm receiving.
I'll quite happily admit when I'm wrong - I have done before, and many times on here, too. But this time, I'm not wrong (Well, I'm not lying, which is what I'm being accused of).
![[TW]Fox](/data/man-of-honor/2009.png){kind=avatar}
So straight away we've got a variable in there which would get your results kicked from any proper scientific test..
Where have I claimed it to be anything like a proper scientific test? But the second driver is a constant - always three days a week, always on the same route and always at the same time of day.
If the second driver used the car completely randomly, I could almost understand your point, but that isn't the case.
Of course, you've missed the main point of what I said, which is that my findings were a consistent trend over 8 months. But of course, every variable works in the favour of SUL. You are so unbelievably naive.
If the second driver used the car completely randomly, I could almost understand your point, but that isn't the case.
Of course, you've missed the main point of what I said, which is that my findings were a consistent trend over 8 months. But of course, every variable works in the favour of SUL. You are so unbelievably naive.
Typical MikeHiow - only he is right and the entire rest of the forum are the ones that are naive. Still, I'll give you some credit - at least you've not suggested the additional fuel economy was as a result of your extensive motorsport experience. Yet.
Each brand (e.g. Shell, BP, Esso etc) will have its own additive, I believe this is also true for the supermarket brands but not 100% sure. However, the actual fuel will be same as it usually comes from the nearest refinery.
Whatever the case, there are strict petrol and diesel specifications, so even if it gets imported it will have to meet these specifications. If it's imported into a refinery terminal it will often be blended with the petrol/diesel produced there.
crappy little cars dont need sul but they can benefit if the ecu has different maps for 95 and 98. more mpg and a smoother engine can be had.
i find similar, its down to the timing being retarded.