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New to fast and so many qusetions

Discussion in 'FAST Support Forum' started by 37jbrock, Dec 3, 2017.

  1. 37jbrock

    37jbrock New Member

    Joined:
    May 18, 2013
    I have been building my 37 chevy coupe for some time now and am in the push to get it done. The motor is a 496 bbc with 2 ez efi throttle bodies the fast crank trigger kit an hei distributor a msd 6a ignition box, msd blaster 2 coil, the GM harness and the XFI 2.0 ecu. Question 1 which o2 sensor should I use and I read it has to be 20 inches from the exhaust outlet is that pipe 20 in or measure 20 inches. Question 2 the tech at the shop where the motor was built said he made his own air fuel ratio settings instead of using the fast stuff should I send the ecu back to fast for a re-flash. Any other comments or lessons learned would be greatly appreciated. Thanks
     
  2. LnL

    LnL Member

    Joined:
    Nov 24, 2010
    Q1: You want the O2 sensor to be mounted before the muffler. It should be AT LEAST 20" from where it is mounted, to the end of the tailpipe. It can be much more than that, I usually mount mine right after the header collector. I've seen some mounted in the header collector.

    Q2: Your system should have a self-learning function, I believe. You can use that to get your tables close. Then, if you don't feel that you have the expertise, find a reputable local tuner. If they can tune LS motors, they should have no problem with the FAST software.

    comment: I've seen way too many Blaster 2 coils fail, sometimes causing ignition boxes to fail. I'd use a good E-core coil, such as those now sold by FAST. ALL of the oil-filled coils are now made in either Mexico or China, and all are failure prone. If you HAVE to have an oil filled coil, look for an old chrome-plated canister MSD or Accel, those were some of the last of the U.S. made coils.
     
  3. 37jbrock

    37jbrock New Member

    Joined:
    May 18, 2013
    Thank you very much.I will change the coil before starting the motor. Jeff
     
  4. 37jbrock

    37jbrock New Member

    Joined:
    May 18, 2013
    Good luck has not yet been bestowed upon me yet. Again thanks
     

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