90q What grade of Fuel? / compression

[Lyle]

I mix 93 and 87, too.  I don't notice performance changes during daily
driving from running anything from 89 to 93 octane, but I don't have a good
technique for measuring that.  I've been trying to use mileage as a gauge,
but it's not conclusive.  The S8 runs 11:1 stock, and Audi recommends 92
octane for that engine, so I think you should be fine.

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of David.Payne at brinksinc.com
Sent: Tuesday, May 10, 2005 10:15 AM
To: quattro at audifans.com
Subject: Re: 90q What grade of Fuel? / compression


I mix 93 and 87 in a 2 to 1 ratio.  Gives me 91 which is what is recommended
in the owners manual and on the fuel filler door.  Haven't seen any
performance gains by running straight 93.  Have run 87 and 89 and
experienced lower performance, knock sensor is working, I don't have any
perceived knocking.  Many places in the country 91 is the highest you can
get which is exactly what you need. New (similar) subject:  I plan on
starting on an engine build in the next 6 months or so and am contemplating
upping the compression to a max of 11 to 1.  My thinking is that if I can
get away with 91 at 10 to 1, then perhaps with 93 I can get away with 11 to
1.  I know guys with D series Hondas that run almost 12 to 1 with 93 and
stock engine management. Feel free to chime in. TIA. Dave.