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Timing in a quarter mile run with XFI 2.0

Discussion in 'FAST Support Forum' started by syoung252, Mar 13, 2018.

  1. syoung252

    syoung252 New Member

    Joined:
    Sep 30, 2015
    Hello everyone,

    Recently i have been able to get the data logging working for my XFI 2.0, when i read the log after a 1/4 mile run it shows me the spark at 25.25* constant throughout the whole run/log but on the engine when a timing light its set on it the timing reads 32*, when the car is idling and the throttle gets cracked open the timing will drop to around 27* around 2000 rpm, the spark table shows that it should be adding timing throughout the rpm range going from roughly 32-34* on the low end and 36-38* on the high end but instead it is pulling timing.

    The engine is a TPI 350 that will spin to 6800-6850 on a 1/4 mile run if that helps

    Any advice on this anomaly would help, The combination is in a Stock eliminator car so any power i can find is incredibly helpful.

    If i need to provide any more information on the combination please let me know

    Thanks
     
  2. Fastmanefi

    Fastmanefi Active Member

    Joined:
    Jun 4, 2011
    Location:
    Sonora, CA
  3. syoung252

    syoung252 New Member

    Joined:
    Sep 30, 2015
    Ill send it over when i get access to the tuning laptop i use (Currently in the office). I would say tonight or tomorrow morning would be when im able to send it. Thank you though
     
  4. Fastmanefi

    Fastmanefi Active Member

    Joined:
    Jun 4, 2011
    Location:
    Sonora, CA
    Comments:

    1) Never use Alpha-N
    2) Why fixed timing everywhere?
    3) Your crankshaft ref angle should be 50 degrees. If you set it to 8 degrees the ECU cannot compute the proper timing after that pulse. There is to much time and the internal timing clock wraps around. The ECU is expecting to compute the timing starting from 50 degrees, so there is plenty of time to get all the way to TDC if it had to. This MUST be changed.
    4) Your Spark Offset vs CTS is set at a constant 2.25 degrees. That makes no sense. I think its an oversite.
    5) Max TPS % for idle should always be 2%

    Set the ref angle to 50, adjust the distributor to get that, distributor must be locked out, then verify using the fixed timing mode. You may need a phaseable rotor to maintain rotor phasing.

    I emailed you a copy of my setting-up document.
     

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