[A4] Need for Premium Gas in 1.8T quattro?

[Nick Lawrence]

If the "Check Engine" light comes on when the engine is warmed up and the  
manifold pressure is above 0.7 bar and the engine RPM is above ~3000 RPM,  
you may have a defective knock sensor, an intermittent connection inside  
the knock sensor or a connector/wiring problem.

This is from SJM's site and what I was basing my guess on.  This is info  
on the 10v turbo, very likely to be dufferent on A4's and even 20v 5cyl  
turbo.
So wouldn't it be unlikely that the ecu would ever pull timing from a 10v  
turbo at cruise speed. (65 or so)
I have a portable Oscilloscope and sometime I'll try to hook it up a get  
knock!

On Sat, 23 Sep 2006 06:36:03 -0700, Grant Lenahan <glenahan at vfemail.net>  
wrote:

> This is a guess, but an educated one. I would guess that most turbo cars  
> always knock intermittently, and are optimized by their knock sensing  
> circuitry.
>
> They operate at all engine speeds.
>
> Grant
> On Sep 23, 2006, at 12:20 AM, Nick Lawrence wrote:
>
>>
>>
>> ------- Forwarded message -------
>> From: "Nick Lawrence" <nick at beol.net>
>> To: q
>> Cc:
>> Subject: Re: [A4] Need for Premium Gas in 1.8T quattro?
>> Date: Fri, 22 Sep 2006 21:18:10 -0700
>>
>> I often have asked this question... how can I tell or does any one know  
>> if
>> the knock sensor has detected and backed off timing?
>>
>> Some say knock sensors only are in use above 3k rpm. My two automatics,
>> (90 and 91 100's) rarely go above 3k rpm and use 87octane always.  With  
>> me
>> driving and running premium or using premium on the hiway shows no mpg
>> gain.
>>
>> I use premium in my '90 200 tqa but would still like to know if it ever
>> knocks. I have never got a code but I understand it can knock and make a
>> code.
>>
>> Comments?
>> Nick
>>
>>
>>
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>



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