Gen 3 vs Gen 4 tire PSI recommendations; ZVW51L-AHXBBA model??

Discussion in 'Gen 4 Prius Main Forum' started by Dan Y, Jun 17, 2022.

  1. Dan Y

    Dan Y Junior Member

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    This is more of what one might call an academic question: why do Gen. 3 (in this case taking from 2010 manual) vs. Gen 4 (2017 manual here but I know 2022 is same) have different PSI specifications for otherwise very similar tires (slight difference in speed rating), with 35/33 for Gen 3 and 36/35 for Gen 4? Also why the variation in how much discrepancy between back and front, 2 vs 1 PSI? I did notice a difference in wheel size.

    Also what is this "ZVW51L-AHXBBA model" thing? I could not follow the instructions in the 2017/2022 manual for how to figure out one's model and ascertain if your car was this model.

    2010 Manual: 2010 Toyota Prius Manuals & Warranties | Toyota Owners

    2017 Manual: 2017 Toyota Prius Manuals & Warranties | Toyota Owners
     

    Attached Files:

  2. bisco

    bisco cookie crumbler

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    psi recommendations are based on vehicle structure and weight. gen 4 is independent rear suspension, first in a prius.

    i thikthe zvw thing refers to the engine, but all prius have the same engine within generations
     
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  3. alanclarkeau

    alanclarkeau Senior Member

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    Tyre Pressure will also have a bearing on vehicle driving behaviour. To balance oversteer, they might increase REAR pressures.

    Any of us who remember old Rear Engine VWs and Renaults - will well know how the way they drive depends on both the quality and pressures FR/RR of the tyres.

    Gen 4 has a totally different chassis and body - nothing is carried over from Gen 3.
     
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  4. Billy56

    Billy56 Member

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    Both cars.....just inflate to 50 lbs pressure and call it good. It says 44 lbs max on the tire sidewall....I ALWAYS run 50 lbs.....better fuel economy!
     
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  5. 2010moneypit?

    2010moneypit? Member

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    I always run max on the sidewall of the tire. I am too chicken to go above tire manufacture max pressure. When you drive the tires heat up and the tire pressure increases especially when we have warmer ambient temperatures This is the reason I fill my tires the indicated max pressure on the sidewall of the tire. Most if not all manufactures recommend that you fill the tires when cold. (Before the car has been driven)
     
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  6. Dan Y

    Dan Y Junior Member

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    I figured out the "ZVW51L-AHXBBA model" is on the plate in the door with the VIN on it. Mine in 2022 Prius AWD-e LE is apparently ZVW55L-AHXEBA.

    44psi is the max # on the sidewall of my OEM Bridgestone Ecopia EP422 Plus tires.

    The dealership actually delivered it at that PSI and I didn't notice until after a 1000 mile road trip we took a week after getting it. After having car few weeks checked the tires because was feeling like rough roads really felt very rough and was wondering if that could be why. STreets/raods are in really bad condition in Brooklyn, NY where I live, and I think were much better on road trip I took early on.

    I don't have really high standards for a smooth ride, the main cars I have ever driven a lot were a 2000 Honda Civic, a 1991 Plymouth Colt hatchback, and an old school VW van.

    It seemed like lowering psi a bit closer to door placard recommendations (honestly can't remember what I have had it set at most of the time) helped have less rough ride but I also didn't drive it that much during school year when my teacher wife took it to work. Starting in April though I felt like I noticed the ride seeming rougher again and getting worse over time: I am probably going to get tires balanced and allignment checked and maybe suspension looked at, but first may play with tire pressure.

    As I mentioned in other post we had BOTH a slow flat on front right and a major blow out on back left and had to totally replace back left tire, noticed both within days though not sure how long had slow falt (after replacing tire checked PSIs and noticed slow flat).

    It now just really increasingly seems like feel every bump no matter how small and there's sometimes weird side to side front bounce, all of which I notice much more at lower speeds.

    It's hard to believe increasing psi will help rather than harming but I will try it again. I actually did try few weeks ago and developed problem that dealership diagnosed as loose alloy wheel lock on the back right wheel where dealership had replaced tire. So I guess they didn't tighten that right. But still having issues with rough ride, side-to-side bounce esp. at low speeds on rough surfaces.

    I might ultimately replace tires, do people have recommendations?
     
  7. PaulDM

    PaulDM Active Member

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    37 psi front
    35 psi rear
     
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  8. bisco

    bisco cookie crumbler

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    increasing pressure will not help smooth the ride, it will help mpg's marginally.

    lowering pressure smooths the ride, but don't go under the spec. and remember to check them based on ambient temp.
     
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  9. 2010moneypit?

    2010moneypit? Member

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    agree
     
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  10. Dan Y

    Dan Y Junior Member

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    This is what you personally do? Why not the 36, 35 recommended in manual and door? Or do you have slightly different model with different recommendations?
     
  11. PaulDM

    PaulDM Active Member

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    1 psi makes no difference other than semantics
     
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  12. jteran5

    jteran5 Active Member

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    ZVW50 = Regular Prius
    ZVW51 = I believe is for the higher trims like the Four or Touring (2016-2018) or Limited (2019+) designating higher weights and options
    ZVW52 = Plug-In/Prime
    ZVW55 = AWD / E-Four

    Posted via the PriusChat mobile app.

    I always get confused with the ZVW51
     
    #12 jteran5, Jun 18, 2022
    Last edited: Jun 18, 2022
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