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Offline Ferrari Fissatore

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well, Besankos quote is old, for starters... that article is how old?

I just checked...

almost 10 years!

 :rolleyes:



Offline Aircon

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well, Besankos quote is old, for starters... that article is how old?

and there IS that much room in ignition...

cars are built to the lowest common denominator.... which are extremes of altitude and fuel quality...

by removing the LCD, or at least reducing the window, gains are made.

errrrrrrr...of course I'd be the last person who'd ever want to disagree, but electronics allow variation depending on fuel, barametric pressure and temperature automatically.  knock sensors, temp sensors and air pressure sensors adjust timing and fuel as needed to optimise economy and power.

Still makes no sense to me.

I love my car. Buy your own



Offline Ferrari Fissatore

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With good quality fuel you can run more ignition advance at lower rpm and partial throttle, giving better response and efficiency.

If you design a car to accept 91 RON fuel, it can only run "so much" at X rpm.... raise the fuel to 95 or 98 etc, and "so much" can be more than it was.

And that's just ignition.

10 years ago, when Besankos article was written, there were less options and sensors/control units were not so clever.

Nowadays, changes can be made to inlet manifold variable length devices, and variable cam timing and valve lift devices.

The eggspurts that do this all the time are mostly very clever guys and in most instances, the gains are tangible.

There's a HUGE market in the trucking industry... saving 0.5% fuel is worth paying for.



Offline Ferrari Fissatore

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Go and dig up the computer you were using 10 years ago..... and see how well it copes with todays demands and capabilities.



Offline Ferrari Fissatore

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  knock sensors, temp sensors and air pressure sensors adjust timing and fuel as needed to optimise economy and power.





wrong.

sensors read stuff, thats all. They don't DO anything.

The control units adjust things.

and the control units can only give instructions based on what they've been told to do.

For example, you may be driving along at sea level in perfect weather, so the ECU says, great... MAX available advance is 36 degrees... DO IT!

But at 42 degrees, you have more power. Hence, chip/tune time.



Offline Aircon

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Go and dig up the computer you were using 10 years ago..... and see how well it copes with todays demands and capabilities.

yeah...ok...we get it.

I was thinking modern cars, to which your points wouldn't apply...and performance cars, which aren't designed to run on 91 in the first place.

I love my car. Buy your own



Offline Aircon

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wrong.

sensors read stuff, thats all. They don't DO anything.

The control units adjust things.

and the control units can only give instructions based on what they've been told to do.

duh...you don't say.

what a stupid post.
I love my car. Buy your own



Offline Ferrari Fissatore

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yeah...ok...we get it.

I was thinking modern cars, to which your points wouldn't apply...

well don't quote 10 year old posts and query them then.

Idiot.



Offline Ferrari Fissatore

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Offline Ferrari Fissatore

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  • Joined: Jan 2007

  • Drives: its obsession
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...and performance cars, which aren't designed to run on 91 in the first place.



they may not be designed to, but they are designed to be capable of.

Most performance cars "recommend" 95 RON, but they make the cars capable of running on 91 without damaging themselves.

Not all cars have knock sensors, and even if they do have them, there may not be enough of them.



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