Data Questionable

Discussion in 'PSI Superchargers Tech Questions' started by Moore, Sep 9, 2010.

  1. Moore

    Moore New Member

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    Downloaded the data, but had spikes and not all channels recorded. Shifted by the light, but the RPM data recorded wasn't even close. The only channel that appears to be correct is oil pressure. I've checked grounds and all connections. Any ideas??
    Thanks!
     
    #1
    Moore, Sep 9, 2010
  2. Relentless

    Relentless www.bretitanium.com

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    Purely at a guess...interferance from mag
     
    #2
    Relentless, Sep 9, 2010
  3. Mike Canter

    Mike Canter Top Dragster
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    Moore, you are kind of lean in your info. Tell us more. What kind of data recorder is this. Have you tried a recording at idle? Is this a new install?
     
    #3
    Mike Canter, Sep 9, 2010
  4. Moore

    Moore New Member

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    Mike - This is not a new install, unit has worked great in the past. Racepak V-Net 300, unit does record ok in the pits @ idle and quick blips to check response. Had this problem once before and was told the record button has to be held for 5 seconds, that is not the issue this time.
    Any input would be appreciated.
     
    #4
    Moore, Sep 9, 2010
  5. Mike Canter

    Mike Canter Top Dragster
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    What kind of car is this V300 in? Is it a dragster, FC or promod or what?
     
    #5
    Mike Canter, Sep 9, 2010
  6. Moore

    Moore New Member

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    Mike - it is a dragster, blown KB, no tire shake
     
    #6
    Moore, Sep 10, 2010
  7. MKR-588

    MKR-588 Member

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    If you are using wire leads, change them to spiral core & see if that helps.
     
    #7
    MKR-588, Sep 10, 2010
  8. Mike Canter

    Mike Canter Top Dragster
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    As MKR indicates. Racepak will tell you that this is a on going problem with using a V-Net system in funny cars and dragsters and this is why they don't recommend it with those type of cars. A lot of racers have no problems but then some do. It doesn't seem to bother a Promod. The Promag and the ignition system radiates too much electromagnetic interference. Some cars/systems can take and some can't. The indication is exactly what you are describing. Since you say the V300 worked OK before then something has been changed. Either you are using a different type of spark plug wires or you changed the routing of some wires or you have lost a ground somewhere. One of the big antennas for picking up this interference and feeding it to the V300 is the EGTs wires. We had to wrap a ground wire around each of the braided wires and ground them to the chassis on one car to make it all work. Think back to what you did when the problem first occured. Maybe call Racepak and see what they have learned and what their fixes have been.
     
    #8
    Mike Canter, Sep 10, 2010
  9. Moore

    Moore New Member

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    No luck with contacting Racepak. Thanks for the input, I'll start looking and thinking.
     
    #9
    Moore, Sep 10, 2010
  10. secondwindracing

    secondwindracing top alcohol

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    call and leave Todd Payton a message he is very good on calling you back and he is a great guy to help you..Dave
     
    #10
    secondwindracing, Sep 10, 2010
  11. MKR-588

    MKR-588 Member

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    While we are on data downloading, what difference would you expect to see in the EGT when the engine has slight detonation?
     
    #11
    MKR-588, Sep 11, 2010
  12. Mike Canter

    Mike Canter Top Dragster
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    Probably nothing if slight detonation. EGTs change very slowly.
     
    #12
    Mike Canter, Sep 12, 2010
  13. MKR-588

    MKR-588 Member

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    Do they read higher?
     
    #13
    MKR-588, Sep 17, 2010

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