2009 A4 TSI

[Jeremiah Curry]

I had a 99 Passat and it started having a lot of trouble running.  Got to 
the point where it would die at ide.  Took it to my Audi specialist and it 
was full of carbon buildup.  He said it was from not running premium.    Not 
sure if that was true, but they were very good and I never had any trouble 
again after I started using premium.  I had always figured since it was not 
a turbo I could just use regular and it would retard timing if needed.

-----Original Message----- 
From: Nick Lawrence
Sent: Thursday, June 5, 2014 7:50 AM
To: quattro at audifans.com
Subject: Re: 2009 A4 TSI

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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