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  1. 06-13-2006, 11:22 AM #1
    johnD
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    Boost at 7500rpms?

    What is the expectd boost of a Riva stage2 RXP running at 7500rpms? What is the max boost range for a stage2 at full rpms? I'm trying to find out if I have aboost leak. I can't get it up past 7700 so I'm using 7500rpms as a basis. Thanks!

    John
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  2. 06-13-2006, 11:29 AM #2
    Sirhc7897
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    When I was at 7800-7850 I want to say I was around 6 psi...

    At 8050 I am cranking just a hair under 8 and I believe at 8150 you are in the 8-8 1/2 range

    When I installed mine I had a boost leak and couldn't turn past 7600. Re-sealed it and removed the BOV and it went to 7850-7900. Had the prop repitched and it now sits comfortably at 8050 all day long in 95 degree heat...

    Edit - Knowing 5500+/- + 0psi and 8150 = 8+ psi I'm guessing you should be in the 5-6 range @ 7500-7700rpms?
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  3. 06-13-2006, 07:42 PM #3
    Pale Rider
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    Quote Originally Posted by Sirhc7897
    When I was at 7800-7850 I want to say I was around 6 psi...

    At 8050 I am cranking just a hair under 8 and I believe at 8150 you are in the 8-8 1/2 range

    When I installed mine I had a boost leak and couldn't turn past 7600. Re-sealed it and removed the BOV and it went to 7850-7900. Had the prop repitched and it now sits comfortably at 8050 all day long in 95 degree heat...

    Edit - Knowing 5500+/- + 0psi and 8150 = 8+ psi I'm guessing you should be in the 5-6 range @ 7500-7700rpms?
    Chris, that sounds about right, same with the GTX here, at 8100 it`s at 8 psi...PR...
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  4. 06-14-2006, 10:40 AM #4
    johnD
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    Thanks for the info. So its 5-6psi's at 7500 rpms. I'll see what I'll get tomorrow. Hope my prolem is just as simple as a boost leak.

    John
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  5. 06-14-2006, 12:12 PM #5
    BDNJ
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    JohnD - Check the hose connections, especially on the pipes going into the i/c. These tend to slip off when the motor torques, and may require double clamps. I now run double clamps on all pipe connections. Jerry and I both had this problem @ Mudbug.

    Also, make sure your old i/c blockoff plate is sealed with black permatex before the clamp is retightened. Peolple have complained about loosing boost from this part as well.

    Hope this helps.

    Brendan
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