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  1. #11
    Senior Member cspak71's Avatar
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    Quote Originally Posted by Drazyw View Post
    Every once in a while i'm popping a code P0299 "Underboost condition" Could this be related to this leak?
    I've popped that code as well.. I believe so. Not sure if this is the cause, but it's making me wonder...

    granted I'm not sure if you're getting that stock, or with a boost controller. When my MM box is set turned off, the car works fine.

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  3. #12
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    Quote Originally Posted by tcarretti View Post
    Which fitting are we talking about here?

    And where exactly would you place the check valve?

    In the stock system, is the check valve located in the hard intake line between the airbox and the turbo inlet?

    Thanks,

    Tony
    Kind of. If you look at the air inlet elbow (accordian rubber) and follow where it goes into the turbo, right after it makes the 90 away from the turbo, there are two hoses connecting to it. The small one you leave alone as it's just the return hose for the electronic boost control solenoid. The 2nd one is a quick disconnect type fitting that is bigger (has a squeeze tab on it). The problem is you're leaking boost out of that hose (into the intake) when you're on throttle. If you wanted to stop the leak, you plug that hose or put a checkvalve there that only allows flow away from the intake pipe.

    That will fix the boost leak, but you gotta be careful because you might be disabling another device in the process. If that hose is there to feed clean air into the Evap solenoid then cool. If the hose is there is vent into the intake, then a checkvalve would effectively disable this. One of us will figure this out. At least we have the ability to control the boost leak in this particular area of the system for now.

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    Senior Member cspak71's Avatar
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    Quote Originally Posted by twingtx View Post
    Kind of. If you look at the air inlet elbow (accordian rubber) and follow where it goes into the turbo, right after it makes the 90 away from the turbo, there are two hoses connecting to it. The small one you leave alone as it's just the return hose for the electronic boost control solenoid. The 2nd one is a quick disconnect type fitting that is bigger (has a squeeze tab on it). The problem is you're leaking boost out of that hose (into the intake) when you're on throttle. If you wanted to stop the leak, you plug that hose or put a checkvalve there that only allows flow away from the intake pipe.

    That will fix the boost leak, but you gotta be careful because you might be disabling another device in the process. If that hose is there to feed clean air into the Evap solenoid then cool. If the hose is there is vent into the intake, then a checkvalve would effectively disable this. One of us will figure this out. At least we have the ability to control the boost leak in this particular area of the system for now.
    Awesome, please let us know what you find.

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    Quote Originally Posted by cspak71 View Post
    I've popped that code as well.. I believe so. Not sure if this is the cause, but it's making me wonder...

    granted I'm not sure if you're getting that stock, or with a boost controller. When my MM box is set turned off, the car works fine.
    I'm not surprised you get that code. The ECU looks for X amount of boost by X RPMs when you go wide open throttle. If it doesn't see X amount of boost minimum under that load condition, it will throw a fault that you are...."underboosting". It thinks you have a mechanical problem possibly.

    Enter "the box". The box modifies the signal to the ECU as to what boost you're running. So if you're running 20 psi of boost, the box only tells the ECU that you're running for example 10 psi of boost. The ECU notices that it's not the minimum required boost and throws the underboost code. That's my theory.

    Try turning the adjustment on the box down to less aggressive and see if the code goes away. This should increase the broadcast boost pressure the ECU sees and *may* remedy the issue with this code.

    And, yes, the leak might make a difference too...

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    Senior Member WegoFaster@Ambient Thermal Management's Avatar
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    Quote Originally Posted by twingtx View Post
    I'm not surprised you get that code. The ECU looks for X amount of boost by X RPMs when you go wide open throttle. If it doesn't see X amount of boost minimum under that load condition, it will throw a fault that you are...."underboosting". It thinks you have a mechanical problem possibly.

    Enter "the box". The box modifies the signal to the ECU as to what boost you're running. So if you're running 20 psi of boost, the box only tells the ECU that you're running for example 10 psi of boost. The ECU notices that it's not the minimum required boost and throws the underboost code. That's my theory.

    Try turning the adjustment on the box down to less aggressive and see if the code goes away. This should increase the broadcast boost pressure the ECU sees and *may* remedy the issue with this code.

    And, yes, the leak might make a difference too...
    They are also only changing the MAP sensor and not the TIP sensor signal which is seeing a higher pressure value than the MAP. The tuner we are developing modifies both signals. 8^)
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    Quote Originally Posted by Wego Faster @ Tifosi View Post
    They are also only changing the MAP sensor and not the TIP sensor signal which is seeing a higher pressure value than the MAP. The tuner we are developing modifies both signals. 8^)
    Please elaborate and give details!

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    Bumping this thread to see where we ended up. Anyone been running a check valve on that hose that goes back into the intake? I've noticed it's a terribly weak connection fitting overall, is that the actual reason for the leak, or is it just the fact that it's being routed to the intake in the first place? Where did we end up? That dyno on page one actually looks worthy of pursuing this to it's final end.
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    Senior Member WegoFaster@Ambient Thermal Management's Avatar
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    Quote Originally Posted by shagghie View Post
    Bumping this thread to see where we ended up. Anyone been running a check valve on that hose that goes back into the intake? I've noticed it's a terribly weak connection fitting overall, is that the actual reason for the leak, or is it just the fact that it's being routed to the intake in the first place? Where did we end up? That dyno on page one actually looks worthy of pursuing this to it's final end.

    I'm the one who discovered this fantastic oversightZ I run a check valve on the Dart and Abarth with zer0 issues.
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    can you post pics of this and list the part (check valve) that you used on this?? thanks

  14. #20
    Senior Member WegoFaster@Ambient Thermal Management's Avatar
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    I have a pic but not a part number. It is just a typical 3/8" (I think) check valve with the arrow on the valve pointing towards the chargepipe.
    check valve.jpg
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