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a/c makes her run, wierd..

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    #1

    a/c makes her run, wierd..

    hard to explain how the a/c running changes the way my car runs.

    we drove 280 miles one direction with no a/c on @ 80mph and got about 27mpg and had plentiful power going up grades through the passes without downshifting.

    we drove 280 miles in the opposite direction with the a/c on @ 80mph, and got about 32 mpg, but she could barely hold 70 up the same grades, in 4th.

    not sure what to make of it. when i hit the button to turn it on, the engine actually hesitates, and kind of bogs down, almost like im driving while riding the brakes. and every time the clutch engages you can feel it lurch. i know the previous owner did not convert it to 154a, so i dont know the last time the system was lubricated, or if r14 even carried system lubricant like 154a does. i'm about ready to have the system converted, but before i do, i'm trying to understand why my MPG's went up. the a/c even running on r14 still blows ice cold, so i really dont want to bother with the conversion.

    any input would be, well, great.
    Tags: None
    #2
    I can explain the reason it bogs down, when you turn on the a/c it takes more power off the motor to run the compressor Hence slowing it down.

    The only reason i can think of is if your windows were down and it put a drag on your car.

    The a/c on didn't drag it as much.

    I remember reading that in the fuel efficiancy compliation i believe.


    Under Driving style
    http://www.cb7tuner.com/vbb/showthre...uel+efficiency

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      #3
      its R12 and R134a, lets hope you're not using anything other than those two

      member's ride thread
      93' EX Coupe H22A w/ P2T4 Sir 5spd 191whp 155 wtq
      99' Lexus LS400 157k VVTi V8 gets up & goes...new DD
      91 Accord SE 176k
      97' Honda Odyssey 199k miles...$485 spare van for my parents

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        #4
        windows were up in both directions. i know the a/c puts an added pull on the engine, this is my 5th cb with a/c, and 19th car total with a/c, this is the only one that has been so noticable when the clutch is actuated. and the only one that made a serious influence on the gas mileage, and in the wrong direction

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          #5
          Originally posted by Losiracer2 View Post
          its R12 and R134a, lets hope you're not using anything other than those two
          sorry i knew what i was meaning. my brain is toast right now. 18 hours of total drive time plus 9 NOS drinks from honda-tech isnt helping my thought process.

          Comment

            #6
            maybe you were drafting an Escalade? I gained about 5mpg by drafting cars on the interstate even with the AC on. Overcoming aero drag is really your biggest obstacle when trying to attain better MPG.

            member's ride thread
            93' EX Coupe H22A w/ P2T4 Sir 5spd 191whp 155 wtq
            99' Lexus LS400 157k VVTi V8 gets up & goes...new DD
            91 Accord SE 176k
            97' Honda Odyssey 199k miles...$485 spare van for my parents

            Comment

              #7
              Originally posted by Losiracer2 View Post
              maybe you were drafting an Escalade? I gained about 5mpg by drafting cars on the interstate even with the AC on. Overcoming aero drag is really your biggest obstacle when trying to attain better MPG.
              We were alone pretty much the entire time

              Comment

                #8
                this actually happens to me as well, mine is an automatic though , but i do notice the difference while driving with my a/c on which is like all the time , and when i turn ac off i notice my car runs nice and strong

                Comment

                  #9
                  is it possible the pump needs lubricated (or even can be), so its not as much of a drag on the motor?

                  Comment

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