Flat Tow a 2010

Discussion in 'Gen 3 Prius Technical Discussion' started by Taxi/Limo, Sep 7, 2022.

  1. Taxi/Limo

    Taxi/Limo Active Member

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    Can you flat tow a 2010?
    Thanks
     
  2. ChapmanF

    ChapmanF Senior Member

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  3. Tombukt2

    Tombukt2 Senior Member

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    That's what I thought is it the same for the '09 and the one NZ? Or is there a pin or something you can do to make everything free wheel?
     
  4. bisco

    bisco cookie crumbler

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    flatbed?
     
  5. prius16

    prius16 Active Member

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    No, like with an automatic tranny connected to a gas engine, the oil pump for the (non Prime) tranny only operates when the engine is running. So, without the engine running, the tranny gears and bearing would take a lot of heat and wear, eventually causing an early failure.

    Below, prof Kelly mentions the electric oil pump added for the Prius Prime (plug-in):
    (The tranny oil pump being driven only when the engine is running, is also mentioned in his other Prius tranny videos)

    The 20-Year Evolution of the Prius Transaxle
    May 18, 2017
    WeberAuto
    Go To Time Stamp: 8:53

    Code:
    https://youtu.be/TRSQEgLk_2M?t=533
    



    .
     
  6. Tombukt2

    Tombukt2 Senior Member

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    So that's what I was wondering there's an electric pump so could one activate that electric pump some kind of way with a switch or something to make it run while you're flat towing the vehicle I'm sure it's not a humongous high low draw pump just moves the fluid around I guess I'm not spent a whole lot of time on the videos I've watched all this guy's videos but I have to go over him again when questions like this come up there are other heavy trucks and things like that that have similar setups not hybrids but transmission pumps and all that and I do believe if you have a way to make them operate you might be able to do what you want considering it's electric would mean I don't know if it's internal in the transmission and there's no way to get to it or hell all that works and if not I mean a tow dolly isn't that expensive. But if you're only going a couple blocks and you keep it under 40 miles an hour I would think you would have a pretty long way to go without too much funny business I would think it's when you get up to U-Haul speeds 55 mph plus or something is where your range would get limited very quickly and things would start to happen Not at city traffic speeds?
     
  7. ChapmanF

    ChapmanF Senior Member

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  8. Tombukt2

    Tombukt2 Senior Member

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    I would imagine so so the transmission just going around and around and getting pumped is not going to cut it I mean a tow bar is too cheap to even really entertain the discussion some people own them but my question is is if you're going city speeds like pulling the car from where it broke down to the house 11 mi in the city Am I going to ruin the car transmission whatever in the 35 to 45 range that distance?
     
  9. ChapmanF

    ChapmanF Senior Member

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    I would say, if you're going to insist on trying it, first learn the speed above which your specific Prius generation has to run the engine while coasting, and keep your towing safely below that speed.

    If you're not going to insist on trying it, you can just follow the owners' manual, which says not to.
     
  10. Tombukt2

    Tombukt2 Senior Member

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    I was just wondering what I could get away with around the yard on the property and maybe 12 mi from home or something along those lines if I had to. That's all this is not something I'm going to whip down the road just because. Usually I don't have any problems with these cars I drive away from everywhere I go. I was just curious about if I was in a serious spot and didn't want to call the tow truck my sienna van is only a few miles away etc. But I have a tow dolly so if I wanted to clamp that up there you go but then the Prius if it's not running it's hard to roll up on the tow dolly
     
  11. ChapmanF

    ChapmanF Senior Member

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    For each generation of Prius, there is a specific road speed, which you can read up on, above which the engine must be turning. It may have been somewhere around 41 MPH in early generations, upped to perhaps 46 later, and then maybe something higher.

    For anybody wondering what they could get away with, that particular detail of the hardware might be a worthwhile place to start thinking it out.
     
  12. CR94

    CR94 Senior Member

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    Yes, about 46 mph (which corresponds to about 5500 RPM of MG1) in the 3rd generation. That MG1 (backward) speed limit may have to do with high back-emf generated with no current flow, as well as with mechanical stress from centrifugal force. A clue would be whether it's lower than the (forward) motor-generator speed limit allowed when accelerating hard from a stop.