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Thread: overboost, overboost not enabled

  1. #41
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: overboost, overboost not enabled

    What about the stock tunes, should I take the diodes off the 2 bars as well?
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  2. #42
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: overboost, overboost not enabled

    i watched the video you sent me. no idea what is doing that.

    take all map sensor diodes off.

    what other things have you done?

    the wiring can be totally stock and all mods can be done in the cal.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  3. #43
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: overboost, overboost not enabled

    Brian, no other wiring changes, beyond that just sensor replacement recently. Long ago I did wiring changes to the lm wiring to hook up the four wire ais.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  4. #44
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: overboost, overboost not enabled

    Update!
    Mike E. from Dairyland chapter stopped by my place unexpectedly a couple day ago. He listened to my problem and identified it as the engine backfiring through the exhaust. This happens because a late spark event fires the plug when the exhaust valve is still open. The late spark can be caused by a bad plug, a bad plug wire, a weak response from the coil or bad distributor cap. He mentioned that closing the gap between the spark plug wire blades and the tip of the rotor can result in more consistent coil operation. I went and got a new cap and installed the wires. Then I took a needle nose and reformed the blades to closer than 1/16 in. Testing showed fewer occasions of this backfire a nearly consistent accelerations without any backfire.
    I also ran a mpscan today that showed zero retard until about 4600 rpm when all four cylinders showed various degrees of retard at the exact same time, 4600 rpm.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  5. #45
    Supporting Member Turbo Mopar Contributor
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    Re: overboost, overboost not enabled

    Sounds promising
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  6. #46
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: overboost, overboost not enabled

    Now if I can just figure out why it retards all four cylinders simultaneously, for about a half second.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  7. #47
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: overboost, overboost not enabled

    are you retarding the timing too much in the cal at 4600?

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  8. #48
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: overboost, overboost not enabled

    That is possible but consider this, I switched to the 87 Shelby Lancer LM and 52 lb injectors, it still does it about 5500 rpm but it is just a stumble and goes right on to 6000 rpm. It accelerates sharply and doesnt pop cel's. Frankly I am done beating on this trying to tune it for this year. I just want to drive the car and enjoy it. I am grateful for all the help you and others have given me for this experience.
    Thank you,
    Jeff
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  9. #49
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: overboost, overboost not enabled

    Miles, I have positively identified and resolved the backfire problem. It was caused by a hose that was not secure enough at the map solenoid. I made a more secure connections and tested. The engine revs right through to 6K rpm withou any problems. Its embarrassing to admit this but others can benefit from my error of having just one vacuum line leak. Live and learn.
    Again. Thanks to all who offered help and advice.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  10. #50
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: overboost, overboost not enabled

    Glad to hear you have that sorted out. I don't think there are many people out there who haven't had some sort of vacuum related problem at one time or another.

  11. #51
    Supporting Member Turbo Mopar Contributor
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    Re: overboost, overboost not enabled

    Quote Originally Posted by jeff1234 View Post
    Miles, I have positively identified and resolved the backfire problem. It was caused by a hose that was not secure enough at the map solenoid. .
    Yup just like Brian says we have all been there at sometime. This is the reason we all ask about vacuum leaks and grounds! Oh ya and codes...
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

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