Date: Wed, 26 Jan 2000 14:13:44 GMT From: "Eric R. Sterbenz" <ericnopsamth.com> Subject: Re: Regular or Premium in 2.3T?
Folks, Don't forget that the APC and Computer also reduce the amount of boost when lesser grades are used (and correspondingly increase boost when higher grades are used). This in turn reduces the power available. The big question is what grade of gas are the horsepower specifications in the manual performed with? I always suspected regular because my '86 9000T, rated at 160 Hp, used to leap when full throttle in 1st or 2nd. There is just no way 160 Hp could move that big a car that fast. Four Weis wrote: > Bill Hays wrote: > > > I've had the same experience as Julie, also in a '91 9000 2.3l turbo -- > > lesser grades (below 92 octane) won't ping or knock, thanks to the > > anti-knock circuitry, but my gas mileage with, say, 89 octane (I've never > > tried 87 octane) is about 2-3 mpg less in my daily driving (a mix of > > neighborhood, densely urban and freeway driving in the Seattle area) and > > noticeably reduced performance. The 2-3 mpg decrease in mileage offsets > > any price gain (about $0.10 to $0.15 per gallon) from the lower octane > > fuel. The lesson: stay with the premium gas -- better mileage, better > > performance, lower cost per gallon. > > I have a Saab and a Volvo turbo and my experience has been the same as Bill. I > get more miles per gallon with premium, enough to make it less expensive per > mile. Don't fall into the trap of only looking at the price per gallon, look into > the cost per mile. > > The anti-knock computer controlled system works by retarding the timing. Does > anyone have any knowledge about the effect on power output from retarding the > timing? Judging from the decrease in mileage, there is some relationship. -- E.R. Sterbenz ericnopsamth.com
 |
 |
 |
 |
 |
