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Before you buy any Self Learning EFI system, please read!

Discussion in 'FAST Support Forum' started by pbp1, Oct 5, 2015.

  1. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    With the EZ EFI 2.0, it just allows you to see the system fuel pressure is correct and what the pressure is with the engine running at the handheld - without getting out to look at the pressure gauge. Some folks also don't like to use a mechanical gauge and prefer to just plug the gauge port on the regulator. The electrical sensor is a reliable, and accurate, standard GM pressure sensor.

    With the pressure displayed on the handheld, it makes spotting a line, pump, or filter problem, easier - as you can see what the pressure drop is under load while driving.
     
    Last edited: Dec 2, 2016
  2. potvinguy

    potvinguy Member

    Joined:
    Jul 1, 2012
    AA, what type and value of cap did you use? I have the new handheld with the old EZ, and it reboots all the time.
     
  3. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    Non-electrolytic, 82 Pico Farad, 50 volt rated or higher. Mine was an old Sprague poly "Orange Drop" type commonly used in tube amplifiers. Silver Mica and ceramic types should also work fine. Depending on the interference frequency, the Farad rating may need adjusting.
     
  4. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    If you have EZ EFI 1.0, its more likely you have a wiring issue picking up interference near the distributor. This can be a vehicle harness getting distributor interference, and may not be the FAST wiring.
     
  5. Rick's 68 goat

    Rick's 68 goat New Member

    Joined:
    May 13, 2017
    im doing a ls swap in my 68 gto the engine is a lq9 im running the truck intake 75mm tb the cam tick performance torque max stage2 cam specs 227/235 - .618/.605 lsa 110+3 stock heads 1-3/4 longtube headers and full 3" exhaust 3.89 gears.i was looking at buying the fast ez efi 2.0 ls what are your thoughts?
     
  6. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    Your engine can probably handle the EZ EFI 2.0 if you have an automatic trans with stall speed, and can make at least 10 inches of vacuum at idle. A wiser choice would be the XFI Sportsman. Using the Sportsman, there will be zero doubts in compatibility, and it can handle any future upgrades.
     
  7. EMCobra

    EMCobra New Member

    Joined:
    Jun 11, 2017
    We hoped to bring FI to Cobras running high hp, wild cam, 351 Windsors with Tremec five speed trannies. If I read this thread correctly in order to use FAST or any system that uses vacuum as the source for engine load we have to derate our 700hp to get high vacuum. We thought EFI would be a hp adder to more efficiently provide ideal fuel air mixtures at the entire range of rpm. It appears we lose if we go with the FAST system. Our other cars with 850 Double Pumpers or quad Weber Stacks will continue to run circles around these efi's. What are we gaining?
     
  8. Darrell A. George

    Darrell A. George New Member

    Joined:
    May 26, 2015
    Location:
    Hoschton
    You just need to buy the right unit, I road race with a FAST Sportsman XFI and enjoy the ease of use the Sportsman EFI offers. You should probably stay away from the EZ EFI.
     
  9. A A

    A A Well-Known Member

    Joined:
    Jun 22, 2014
    No. You just need the FAST XFI Sportsman or XFI 2.0. These two systems allow for turning off adaptive learning as needed for manual transmissions - and they also don't have any higher vacuum requirement like the EZ EFI Systems. The only other requirement for best operation of any EFI system is a single plane intake. Dual plane intakes were designed to take advantage of carburetor venturi systems and don't dissipate fuel reversion like the large open plenum of a single plane using a TBI system. Fuel reversion in the intake becomes increasingly greater the longer the camshaft duration/overlap is and restrictive dual plane intakes are inadequate for compensation.

    The 2.0 throttle body supports up to 1100-1200 horsepower engines. FI gives much better fueling than carburetion throughout all RPM ranges. It also gives a much improved lower idle and improved drivability over any carburetion system. You just need to use the XFI Sportsman or XFI 2.0 ECU when required.
     
    Last edited: Jun 13, 2017

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