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  1. #1
    Mmafighter's Avatar
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    Valve train upgrade to RXTx 300 have a question

    I have heard that adding the valve train upgrade kit to the RXTx 300 you will lose rpm is this true? Also instead of doing the valve train upgrade if I'm running 8600 rpm can I just do the titanium retainers instead of the springs?


  2. #2
    rick xp's Avatar
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    Apparently the stock valve train is good for 8500 RPM on the 300's due to the accuracy of the limiter. With that being send i am personally running 8800 RPM with just retainers. Dont know if you are supposed to but i am anyway.

  3. #3
    Mmafighter's Avatar
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    Quote Originally Posted by rick xp View Post
    Apparently the stock valve train is good for 8500 RPM on the 300's due to the accuracy of the limiter. With that being send i am personally running 8800 RPM with just retainers. Dont know if you are supposed to but i am anyway.
    I'm on the stage 2 tune with the limiter at 8500. And I'm bumping it all day long. I heard the springs reduce rpm. I want the rpm so it spins the supercharger and makes more power so I don't want to lose rpm. I was hoping that the retainers would help make it safe.

  4. #4
    Water4fire's Avatar
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    The springs have a higher spring pressure/rate than stock so in turn takes a little more power to push the spring and it has shown a slight rpm lose sometimes. I never cared because i could turn higer at 8800 but IMO LESS than 8800 retainers are good.

  5. #5
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by Mmafighter View Post
    I have heard that adding the valve train upgrade kit to the RXTx 300 you will lose rpm is this true? Also instead of doing the valve train upgrade if I'm running 8600 rpm can I just do the titanium retainers instead of the springs?
    Yes, and Yes. However, if you like most of us, you'll want more speed, and adding the upgraded springs takes only moments more time to install. Do it once!

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  7. #6
    Great feedback guys

  8. #7
    moparguy's Avatar
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    Quote Originally Posted by 1tommygunner1927 View Post
    Yes, and Yes. However, if you like most of us, you'll want more speed, and adding the upgraded springs takes only moments more time to install. Do it once!
    100% agree and peace of mind is priceless.

    Sent from my SM-G955W using GreenHulk PWC Performance mobile app powered by Tapatalk

  9. #8
    Mmafighter's Avatar
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    Thanks guys great info

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