COMPLETE LS SWAP MPG

Discussion in 'G-Body LS Swap' started by 20Grand, Jun 12, 2018.

  1. oldsmobile joe

    oldsmobile joe G-Body Guru

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    i calculated with lock-up. at 70mph, engine is turning about 1700 rpms. so you have a pretty good ear for this. you said 1800.

    i used this for the calculator http://www.grimmjeeper.com/gears.html
     
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  2. 20Grand

    20Grand Apprentice

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    Going to have to check this out. I just overheated again tho going up a mountain pass. Going to make a new thread. I have quite a few to pass to make it back home.
     
  3. 20Grand

    20Grand Apprentice

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    Do you have a similar setup?
     
  4. fleming442

    fleming442 Comic Book Super Hero

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    You might benefit from just holding it in 3rd gear. If it's constantly downshifting and locking and unlocking the converter, that's a whole lot of unnecessary heat being created.
     
  5. oldsmobile joe

    oldsmobile joe G-Body Guru

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    Not yet, but soon. I have the 5.3l, holley system, and car. I was going 6spd, but my wife wants an auto. Go figure.
     
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  6. pontiacgp

    pontiacgp Canadian Prime Minister

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    have you done the engine and transmission conversion but never removed the cover on the rear end to see what the ratio is and to change the 30 year old lubricant?
     
  7. olds307 and 403

    olds307 and 403 Comic Book Super Hero

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    Change the gear oil to 75w90 and check the ratio while in there.
     
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  8. 20Grand

    20Grand Apprentice

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    I checked 6 months ago. I believe
    Well, this is assuming the previous owners never replaced the lubricant, then yes. Do you think this could cause the overheating?
     
  9. 20Grand

    20Grand Apprentice

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    I had a really nice 88 Camaro that was manual and hated it in the city. I think I would’ve like it more if there weren’t so many stop signs and lights.
     
  10. pontiacgp

    pontiacgp Canadian Prime Minister

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    If it was old oil it would cost you hp and fuel mileage but it would not cause the engine to overheat. I don't understand why anyone would buy a used car decades old and not change all the fluids because you did say....
    When you say the engine was overheating what temperature did it get up to?
     
    #20 pontiacgp, Jun 13, 2018
    Last edited: Jun 13, 2018
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