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power loss with ac

Discussion in '4 Cylinder' started by Yota1, Jul 21, 2011.

  1. Jul 21, 2011 at 6:02 PM
    #1
    Yota1

    Yota1 [OP] Well-Known Member

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    So this little 4 banger seems to lose more power than any other ride i have had with the ac on, especially if on MAX.

    From a stop, it feels as if i am half throttle and shes is just over 1200 rpm, and sounds like she is under a huge load. At any speed in any gear if you give try and accelerate she feels like i am trying to climb the largest hill in a gear to high.

    Its like the motor wont gain any rpms fast enough, as if the peddle response is super slow.

    I am due for my 15k which will be my last dealer service anyways, so i might have them check it out, just wondering if anyone else notices this issue.
     
  2. Jul 21, 2011 at 7:32 PM
    #2
    o5iiawah

    o5iiawah Well-Known Member

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    Your freebie dealer services should go until 25k. That should be part of the national toyotacare program.

    i live in FL and hot is a way of life... most vehicles will have impacted performance with the AC on. Have you tried running the blower on halfway with the cooling on 3/4 cold? I find its just as cold and the truck seems to run happier.
     
  3. Jul 21, 2011 at 8:50 PM
    #3
    TacomaBuzz

    TacomaBuzz Manual Transmission Enthusiast

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    You read my mind, I was going to post the same thing, I have noticed a huge loss of power with the AC on "Max". if the AC is off, the power is great. I'm glad that I'm not alone here.
     
  4. Jul 21, 2011 at 8:58 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    FlimFlubberJAM
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    Along with the mechanical drag from the compressor, the higher fan speeds, and the current to hold the AC clutch engauged, can create a bit of a loss. Add to this the less amount of O2 in the hotter air, and you can have a significantly reduced feeling of power, when compared to driving with the AC off, and in cooler ambient temps.
     
  5. Jul 21, 2011 at 9:07 PM
    #5
    TacomaBuzz

    TacomaBuzz Manual Transmission Enthusiast

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    Ah, thanks chris, I used to have the 4.0L Tacoma and i barely noticed a loss when the AC was on "Max". Any tips or mods to inrease power while still being able to run the AC??
     
  6. Jul 21, 2011 at 11:46 PM
    #6
    stunt man hans

    stunt man hans displaced viking living in New Hampshire

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    super charger! would do the trick:)
     
  7. Jul 22, 2011 at 12:45 AM
    #7
    chad68

    chad68 Master Jedi Member I am...

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    I don't look at it that way at all OP.

    I drive with the AC on all year long. When I'm flooring it, I flip the AC off and it's just like hitting a NOS switch!

    When that AC gets flipped off, hold on man cause it will throw you back into the seat.
     
  8. Jul 22, 2011 at 10:10 AM
    #8
    Yota Toy

    Yota Toy Taco Sauce

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    I have seriously considered connecting an A/C cutoff switch triggered by the manifold vacuum level (we have no throttle-plate access with throttle-by-wire). I would like the A/C to just cut off at 90% or more throttle and turn back on as soon as I lift. Many cars already have this, not sure why Toyota elected not to, especially on the 4-cylinder...
     
  9. Jul 22, 2011 at 11:14 AM
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    stunt man hans

    stunt man hans displaced viking living in New Hampshire

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    that sounds like a solid idea! although until chris 4x4 chimes in i suggest no one takes apart their ac system just yet lol.
     
  10. Jul 22, 2011 at 11:40 AM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    It already does under WOT.
     
  11. Jul 22, 2011 at 5:33 PM
    #11
    Yota1

    Yota1 [OP] Well-Known Member

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    at least my gas mileage is decent, even if i can beat and old man on a bike off the line from a red light. in all seriousness i am no newbie to the parasitic loss of ac, just i have never had it this bad.

    time for a tundra i thinks......... actually i am considering it anyways
     
  12. Aug 4, 2011 at 9:10 AM
    #12
    wmdpowell

    wmdpowell Well-Known Member

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    Normal as far as I can tell.
    Not too worried about a little loss of power as most any car can take off faster than me anyways,

    I rarely put fan on full (I try to keep a little in reserve 'just in case').

    Old AC units used to get stinky if you didn't air out for the last few mile with ac off. I still do that by habit.

    The manual says to make sure recirculate is off if you have been running ac then park. That makes sense, let the air circulate in the ducts.
     
  13. Aug 9, 2011 at 10:18 AM
    #13
    andy2003

    andy2003 Well-Known Member

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    Average for all vehicles the ac unit can use up to 11hp.
     
  14. Aug 10, 2011 at 10:20 AM
    #14
    billwot

    billwot Well-Known Member

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    Correct.The ECU disengages the compressor clutch under WOT conditions.

    bill
     
  15. Aug 14, 2011 at 7:23 AM
    #15
    Tepidy

    Tepidy Well-Known Member

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    2011 4x4 AC. Its like two different trucks. Great without ac on no issues with enough power. With the ac on its a dog.
     
  16. Aug 26, 2011 at 9:53 AM
    #16
    08pretaco

    08pretaco Almost there

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    you also have to realize your driving a 4 cylinder. most 4 cylinders will have this affect with a/c on. 6 cylinder guys hardly feel the loses due to having more power avaiable from the get go. we have very little to start with so any loses will be very noticable.

    curious if an electric vs clutch driven fan would help any with the overall lag?
     
  17. Jun 27, 2012 at 7:17 PM
    #17
    LDurchy

    LDurchy Well-Known Member

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    Consider too, here in Iowa a hot day can also be a humid day. Internal combustion engines don't perform as well with humid air to burn. Of course, a 4 popper has less in reserve anyway as previously stated by other members. So when you want the cold the most, it is also most taxing on your whole system.
     
  18. Sep 23, 2013 at 8:32 PM
    #18
    airlandsea

    airlandsea New Member

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    2013 4 cyl. I have significant power loss when not only turning on the A/C but also when I just turn the fan to high without A/C. I realize that with any vehicle especially a 4 cyl. you will notice loss of gumption when turning on A/C but I do not think that I should see lights dim and feel significant decrease in power when just turning on fan for defrost or fresh air.
     
  19. Sep 23, 2013 at 10:07 PM
    #19
    2007 tacoma

    2007 tacoma Well-Known Member

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    LEEEEEEROOOYYY JENKINS!
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    You need to take your truck in for service. You may have a short somewhere. That could equal a fire hazard.
     
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