TPMS and Speed Ratings

Discussion in 'SRT Hellcat Wheels and Tires' started by Tire God 2.0, Apr 24, 2016.

  1. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    I have seen claims before, and they are only growing, of valve stems failing due to high speeds and having the "heavy" tpms sensors pulling on the valve stems and causing valve stem failure due to centrifugal forces. The forces at high speeds are pulling the sensor away from the wheel and it's enough to cause a leak or total stem failure(this goes for rubber and metal). Both dill and schrader both list the rubber speed rating at 115mph, and metal at 155mph. What's the answer to this? I have no idea. How about doing what honda,acura,vw,audi have done and go back to the indirect tpms system so there are no sensors in the wheels. Or, in your race wheel and tire setup, don't run sensors. Anyone experience this yet at 200mph?
     
  2. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    I'll pay attention. I'll be tracking the car week from tomorrow, expect 150-160 every two minutes. Or is it just at near 200 where we should be worried?
     
  3. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    They claim max speed for metal at 155mph. I would assume sustained speed promote this at a faster rate. Seems pretty irresponsible to not think about this aspect when building any car capable of these speeds from factory. Maybe it will be addressed once enough people have an issue. But the problem is the "issue" could include injury or death. Not something to toy with. I personally love the fact all cars have a tpms system, it has lowered the rate of tire related accidents by a huge percentage. But what about thoes of us that like to actually DRIVE our cars? Lol
     
  4. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    What do you mean about the "metal"?
     
  5. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    Some cars have aluminum valve stems and some have rubber. Both of which have a tpms sensor tied the the bottom. I'm pretty sure Hellcats have aluminum.
     
  6. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    Ours are metal. You have a good point for folks buying an extra set for either drag wheels or another set. Buy only the OEM units. I have several times now and have noticed a big cost difference.

    I have two on the way to my home now from a well known Mopar dealer in the Carolinas.
     
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  7. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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  8. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    TG you know that you need to order one of their nuts with every TPMS?
     
  9. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    Yes there are rebuild kits that come with the nut/washer, rubber grommet, valve core, and valve cap.
     
  10. DGatzby

    DGatzby Gold Member Hellcat Car Club HCC Charter Member Midwest Regional Pres.

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    When you order a new one, like the link you gave.
     
  11. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    Correct. I always found it strange that they don't include the nut, you have to have it why not include it right?
     
  12. 06SRT10NR

    06SRT10NR The K.N.O.B. Rules Hellcat Car Club HCC Charter Member

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    One could always just band the TPMS, put it 180 degrees out from the valve stem
     
  13. Catless

    Catless Silver Member

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    Since the sensor unit is mounted inside the wheel, I think that statement is backwards?
     
  14. Tire God 2.0

    Tire God 2.0 Senior Hellcat Member

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    This true. That probably the best solution at the moment.
    Catless, the sensor is on the outside of the barrel of the wheel when looking at a bare wheel. Imagine the wheel spinning on a balancer with no tire, but at 150+mph and you can picture the sensor being basically thrown off of the wheel.
     
  15. solo7777

    solo7777 SRT Terminator Hellcat Car Club Western Regional President HCC Charter Member

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    Hey TG. Can you tell me just how accurate the TPMS system is compared to say the good old analog tire pressure pen? Pretty sure America's tires still uses those (I have 2 from them). What I noticed is using the stick, all to 32 PSI, the TPMS system is off on a couple up or down by 1-2 psi. I just wonder about those and do not really trust them.
     
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