Aluminum Driveshaft - Fluke or Positive Side Effect
05-22-2013, 01:12 AM
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Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Aluminum Driveshaft - Fluke or Positive Side Effect
Recently installed a LS1 aluminum driveshaft in my '88 Firebird replacing the stock steel one. For the past year, since I got the car, I've averaged about 20mpg on the highway and 15mpg in the city. Took a recent trip and averaged 25mpg on the highway. Is this an expected result from a steel to aluminum driveshaft and may I see a similar difference in my '91 Firebird where I did the same change?
05-22-2013, 04:21 AM
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Car: 1989 IROC & ROLL-Z
Engine: L98 Vortec FIRST TPI
Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
Re: Aluminum Driveshaft - Fluke or Positive Side Effect
I wouldn't get my hopes up just yet, that is an unreasonable increase for the modification you performed.
Perhaps you might want a bit more than one tank full to tell you if there was any increase.
I'm not sayin there was not, just that more data seems necessary.
Perhaps you might want a bit more than one tank full to tell you if there was any increase.
I'm not sayin there was not, just that more data seems necessary.
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