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  1. #1
    masta2000's Avatar
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    overheating issue?

    i had a stage 3 rxp with stock ecu for 40 hours and never had problems. i just upgraded to rude1, rr ecu 8600, rude fuel controller and 4 inch intake, with valvetrain upgrade and 50# injectors. AFR are 13.5 low, 12.5 mid, 11.5 high. cruising is fine but after maybe 5-10 min of 8-10 psi holding runs at 7900rpm ( not max psi) the overflow bottle starts pissing the prestone and it's boiling. i even got the overheat alarm yesterday. i was riding mild chop, maybe 1 foot. is this normal? stage 3 used to run 10 psi also and never had a problem. is it my rideplate that can't keep up? i have the riva thermostat. if i was ripping it at max throttle i can understand, but this is just cruising at 74 mph. anyone have this problem?


  2. #2
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    How much coolant is in the bottle before you start? Did you ever bleed the system for air bubbles if you changed coolant recently? Thermo could be stuck partially closed...

  3. #3
    You sure it is bioling and not a leaking head gasket?

  4. #4
    masta2000's Avatar
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    i pop the seat off and the prestone is coming out of the cap and the overflow hose. to bleed the system you leave the cap open and let the machine idle right? if i drive the machine at even 65mph its fine. the prestone level is at the beginning at the cold line

  5. #5
    masta2000's Avatar
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    prestone is still clear, would a blown head gasket do this?

  6. #6
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    If the gasket is blown, the oil would be milky...

    Open the tank, grab the hose going from the head to the thermo...squeeze it hard until it collapses, atleast 10 times...The coolant will be forced to move in/out the bottle. Note the bottle level before/after, it should drop....

  7. #7
    Eric Ocman's Avatar
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    Re: overheating issue?

    Your head gasket is blown bro. Trust Me go ahead and order the riva stud kit and head gasket and DONT ride it till you fix it! The only way to make it leak is basically WOT 6500 does not create enough boost (internal engine pressure) to create the leaking condition.

    from how I can interpret it the stock head stretch bolts basically begin to stretch a bit to much under extreme boost in turn causing the failure. This may be correct or incorrect but I try to use logic to solve problems and it sounds logical to me.

  8. #8
    masta2000's Avatar
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    shizz. prestone looks clean and oil looks good too. i just checked the thermo and it's fine. is there a way to check if gasket is blown?

  9. #9
    Eric Ocman's Avatar
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    Re: overheating issue?

    Pull your head. Dont ride it if you can you may inadvertently warp the head or cause further damage.

  10. #10
    Orlando Shark's Avatar
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    If your head gasket blew your oil would be milky, if it's not then it's in your thermostat that is probably stuck partially closed like Danny said. I had the same problem and once I switched thermostats it fixed the problem.

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