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Hwy MPG question

This is a discussion on Hwy MPG question within the Drivetrain forums, part of the LSx Technical Help Section category; How much hwy mpg do you think i will lose going from 273's to 323 in a 3400 stall a4. ...

  1. #1
    Simpsons Did it!! 98formy's Avatar
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    Hwy MPG question

    How much hwy mpg do you think i will lose going from 273's to 323 in a 3400 stall a4. I get now roughly 22-24. Just curious.
    TSP Torquer V2 cam, ported heads,fast 90/90 combo, LT's, 3400 stall, magnaflow CB, most other bolt ons, full suspension, t-top and HID conversion

    422 RWHP, 384TQ

  2. #2
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    Well the stall doesn't matter because at highway speeds it's locked. There's only 300 RPM difference between the two at 68 MPH, so I'd say minimal loss. Last time I checked got about the same as you with a stall and 3.42's.

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    Just me Y2KPewterSS's Avatar
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    With my 3800 stall and 3:23s I get about 23 MPG on the highway. As long as the convertor has a lockup, they don't make much difference on the highway. Its in town where the convertor will decline your MPG more.
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    Senior Member INMY01TA's Avatar
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    I lost less than 1mpg going from 3:42s to 4:10s in my M6. I wouldn't worry about it. Personally I'd get 3:73s.

  5. #5
    Simpsons Did it!! 98formy's Avatar
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    Most of the driving I do is highway and one of my friends went from 273's to 373's in his a4 and lost a considerable amount of mileage.

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