Date: Wed, 12 Feb 2003 04:00:53 GMT From: "Hyperdog" <hyperdognopsame.rr.com> Subject: Re: Gas Grade Question
Integrity? No! Performance? Maybe. Since 1985 SAABs have all incorporated a "knock sensor" technology. It has evolved over the years but essentially it will retard the ignition and reduce boost (Turbo only) in the presence of knocking or heavy pre-ignition (detonation). This protects the engine from slowly self-distructing in the face of "hot" gas (low octane) or very bad driving habits. The down side is that the ignition must be very advanced to produce maximum power at mid and high RPMs with full throttle. The car will emasculate itsself to save you big repair bills. Some people (cheap people) feed their SAABs crappy gas right from new and never get to really feel the rush that their car might otherwise deliver. Kinda sad. I dunno about the AOM octane standard. But if your SAAB has a boost gauge and you've got a stop watch, check the max boost and 0-60 MPH times. Then dump in a can of octane booster, drive around for a 1/2 hour and try it again. It you see clear, repeatable improvements then you know that your SAAB's been runnin' on the edge of knock. Let us know! Woof! "pablo" <pabloNnopsamsimplyhombre.net> wrote in message news:RrP1a.1651$YH4.63850801nopsamsvr15.news.prodigy.com... > > Could anyone tell me where to find information about the "AON" method Saab > seems to use when talking about fuel grade requirements? A sticker in my car > claims I need to use 93 AON, but in California it's (R+M)/2 everywhere, and > one can only find 91 grade as premium fuel anyway. The question is - are AON > and (R+M)/2 significantly different, and is the fact we are forced to use 91 > grade here in CA negatively affecting performance and engine integrity of > our Saabs? > > ...pablo > >