re. octane question

[Ben Swann]

IMO it is unecessary, even wasteful to use high octane in stock 4kq with 2.2l CIS-E.  That applies to the Quantum Synchro as well, which uses pretty much identical engine.  Even with 264 cam and advanced timing(7 deg. over stock), I have been using 89(overkill) in summer and 87 in winter.  Engine revs.quickly to the redline(yes around 6800RPM) with this setup - get 4kq relay to allow high rev. in Synchro.  Lower octane fuel doesn't hurt and I believe it may actually help performance, especially in the winter.

BTW, I obtained similar power increase results with installation of NG/5kt cam in another 4kq - not quite what the 264 does, but the NG cam did make for better torque and rev. at least by my unscientific observations.

Now if your running high compression - such as NG/NF engine, or turbocharged, then you want to run with the higher octane fuels.  For those wanting to rev. higher, consider using Synthetic oil - I have been using Syntec 5W50 year round with great results for many years and will not use any other after trying several - just my experience and not wanting to start synthoil thread.

As always, YMMV and happy Quattroing and Syncroing(used to be Dashering) thru the snow!

Ben
http://www.homestead.com/ben_swann/myaudi.html

[Date: Wed, 7 Jan 2004 17:56:56 -0800
From: "Tom Love" <theloves at localaccess.com>
Subject: octane question
To: "QUATTRO LIST" <quattro at audifans.com>
Message-ID: <002d01c3d58a$b27326c0$0500a8c0 at attbi.com>
Content-Type: text/plain; charset="iso-8859-1"

I have a question as to what US octane is preferred for our 4kq jt engines
(or in that case any 2.1, 2.2 stock 5 cyl NA motors).

 This is a issue floating around on the quantum syncro list and since I
drive both jt code cars I thought I would throw this question to this list
for comments and suggestions.

Any input is appreciated.

btw I use 91 for what it's worth]