[Biturbos4] Detecting 95 and 98 RON setting?

Andy Turner andy at palomar.demon.co.uk
Wed Sep 8 07:52:29 EDT 2004

On Tue, 7 Sep 2004 18:43:38 -0700 (PDT), ti at amb.org (Ti Kan) wrote:

>Andy Turner writes:
>> I believe my 2000 Audi S4 switches various timings whenever I put
>> super unleaded (98 RON) petrol in. However, I've never found 98 RON to
>> make much difference in performance - if anything. Is there something
>> I can look at with my VAG-COM to determine whether the car has decided
>> that it's now on the 98?
>I don't think it detects the fuel, but the knock sensors will cause
>the ECU to dynamically adjust ignition timing to prevent any knock.
>Running higher octane fuel will allow the ECU to run the engine with
>more ignition advance and provide better performance.  I believe
>you can watch the ignition advance in a semi-real-time basis using VAG-COM,
>but I don't remember which measuring block it was.  You'll probably
>find some info on this in the VAG-COM list archives:
>	http://groups.yahoo.com/group/vag-com

Cheers for that Ti. I'd already posted to that group also, but yeah I
should have checked the archives...!



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