2009 A4 TSI

Cody Forbes cody at 5000tq.com
Thu Jun 5 11:13:17 PDT 2014

A p3Cars gauge will also display ignition timing on this car.


I'm staying out of the fuel debate ;-).

-Cody Forbes (mobile)

On Jun 5, 2014, at 1:18 PM, Mark Rosenkrantz <speedracer.mark at gmail.com> wrote:

> You can use Vag-com (vcds) to watch real-time timing.. And graph it.  But
> generally, low load, low rpm driving will not benefit from high octane.
> High quality octane comes into play with load, allowing advanced timing,
> more power, and more efficiency.  So a small engine will benefit more in
> everyday driving than say a 6.2L small block.
> Mark Rosenkrantz
> Typos sent from my droid
> On Jun 5, 2014 9:50 AM, "Nick Lawrence" <nick at beol.net> wrote:
>> I also have trouble with this,   I would like to see a "real time" timing
>> display.    Does using regular instead of premium automatically retard
>> timing?  Or does the computer  have to sense knock then change timing?
>> I personally haven't seen increased mpg using premium on my cars. But I'm
>> generally not on boost a lot.
>> Myth busters?
>> Nick
>> On 6/5/2014 8:37 AM, Paul Caouette wrote:
>>> OK!
>>> I can't help myself. Please look up the energy per unit volume of
>>> "premium" vs "regular" gas.
>>> I don't believe it is the fuel.  It is the way it is packed into the
>>> space where it is burned that increases the energy available. So, higher
>>> compression allows more fuel and oxygen to get pushed into the same volume
>>> awaiting that spark that lights it up. When a knock sensor detects a
>>> pre-ignituon. (Due to lower grade fuel) it regards the timing of the
>>> ignition. This will lead to less energy available in the flame front. But I
>>> don't think there is any more energy in premium gasoline. It is simply a
>>> better quality of the same stuff.
>>> Paul Caouette
>>> Sent from my iPhone
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