FI Tech "Go EFI 4" Self Tuning Throttle Body Injection Install Thread

Discussion in 'High Tech for Old Iron' started by real82it, Nov 2, 2015.

  1. real82it

    real82it Silver Level contributor

    Installed my second FiTech system on a friends car a 2 weekends ago. Fun little car. Dramatically improved drivability over the WAY too big Demon 850 that was on it. Had to do a little more tuning with this one to get it to run right. Had to add fuel to the accel at 65 and 170 degrees to keep it from bucking if you stabbed the throttle quickly. Had a little more trouble getting the IAC count below 10 at idle, but finally got that set. Was getting some popping out of the headers on decel, and was planning on playing with the DFCO settings, but it seems to have tuned itself and has stopped doing that.

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  2. real82it

    real82it Silver Level contributor

  3. bdschuch

    bdschuch bdschuch

  4. Ken Warner

    Ken Warner Stand-up Philosopher

    No mods to the pedal but I'm going to guess the adjustable bracket gives me more travel. With my pedal to the floor the TPS shows 98% on the FiTech handheld.

    FYI for anyone looking for a throttle cable the Jegs brand and the Lokar are indistinguishable once you have them out of the package and the Jegs is about 1/3 the cost.
     
  5. sailbrd

    sailbrd Well-Known Member

    Got the throttle arm problem I had figured out. What was happening is that as the throttle arm was pulled by the cable the route of the attachment point on the arm was going down after 1/2 throttle rather than toward the firewall. I did not take into account that the attachment points route is circular. So we re-fabricated the bracket for the cable to lower it about 3/16th of an inch. Does not seem like much but now get 90% on the TPS and good feel on the pedal.

    Ken's FAST bracket has a slightly lower mounting point for the cable than my BTO bracket.
     
  6. bdschuch

    bdschuch bdschuch

    What temp are you guys using for your fans on and off? Default is 174 and 172.

    Also has anyone else noticed the funkyness in setting up the controller? For example if you enter 462 cubic inch send it to ecu then go back in to look at it, mine will be at 461. Same with fan, I set it at 178 and it dropped back to 177. I had to set cubes to 463 in order to get 462.:idea2:
     
  7. sailbrd

    sailbrd Well-Known Member

    Anyone else have problems with the device for holding the hand held controller? I have never had any of the suction cup things work for longer than a few weeks.
     
  8. Ken Warner

    Ken Warner Stand-up Philosopher

  9. bdschuch

    bdschuch bdschuch

    I also have a lag upon mashing the gas that i need to try to figure out. If im completely off the throttle then mash it from about 1000 RPMs it will fall right on its face and not recover, I have to let off and work into it a little slowly.
    Have you made any progress on your throtttle lag?
     
  10. sailbrd

    sailbrd Well-Known Member

    Have you run a log? Would like to see what TPS vs AFR looks like.
     
  11. bdschuch

    bdschuch bdschuch

    No not yet. I have only put 15 miles on it. going for a good long drive with some hills and such today. i'll try to log today.
    So i just push the log on button and drive?
     
  12. sailbrd

    sailbrd Well-Known Member

    Just push the button and log will start, push again to end. I would advise only doing 10 to 20 seconds at a time. Have a plan for what you want to see. It will data log until it runs out of memory but the software is not good enough to do readable graphs for long log times. If you look at the log with Excell you do not want them stupid long.
     
  13. real82it

    real82it Silver Level contributor

    1. Have you made sure your IAC count in park at idle at warm temp is between 5-10? If yes, then

    You are probably going to need to go in and adjust your accel pump parameters. Probably accel pump 170f. As said, you can run a data log to figure out what is going on. On the T bucket I installed onto a few weeks ago, I had to add 40 to this value at 65f and 170f. Once I did, all lag disappeared and I could mash the throttle without worry and get instant throttle response. Try going up or down in increments of 10 when adjusting, then fine tune.

    Screen looks like this
    [​IMG]
     
  14. real82it

    real82it Silver Level contributor

    I made a little angled steel L bracket, attached a cell phone clip magnet to the back of the handheld, and mounted it with 2 sided tape to my console. Works great. I will grab a pic tomorrow.


    Pics

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    Last edited: Jul 27, 2016
  15. real82it

    real82it Silver Level contributor

    Yes. They all do it I think. Annoying.
     
  16. bdschuch

    bdschuch bdschuch

    I got rid of the lag by bumping up my accel at 170 as you advised. It ended up at 60%, Thank you very much for the info.
    Next thing i need to figure out is the uneven idle and warm start issues. I know i read more about those issues so i have some research to do.
     
  17. bdschuch

    bdschuch bdschuch

    Some great info on the Chevelle site but man is it a pain to read, it's soooo jammed full of popups and advertisements that the page never quits moving.
    Trying to find the info on warm start adjustment, anyone here have that figured out?
     
  18. Dr. Evil

    Dr. Evil Silver Level contributor

    I have the same issue trying to read that site. I'm really close to ordering one for mine. It'd be interesting to see how a mostly stock 350 acts with an FITECH on it. I'd like to use the 350 that's in mine now to get everything sorted before I put a BB in it. The chevelle thread has a lot of great info but its painful to try to wade through. There is a decent thread over on corvetteforum too but they have pop ups and advertising also.
     
  19. real82it

    real82it Silver Level contributor

    Well, this decision bit me in the butt this week. I am out here at Hot August Nights in Reno. Spent the entire day yesterday broke down and then fixing the car. Thank God it didn't die while I was on the interstate. The car melted the orange power wire feeding the fuel pump. The inline fuse melted also....but never blew?? The issue was the fuel pump wire drawing too much amperage. I wired in a new dedicated relay to the fuel pump with power from the battery and key on relay activation wire from my car's engine harness. That goodness all else seems ok and the unit came back to life. I would be S.O.L if I had fried the TB computer. I think I would have been visiting the summit store here and buying a regulator and carb to get me back home....

    Anyway, long story short, I would recommend folks follow others advice and NOT use the fuel pump wire from the unit to power the pump. Rather, use it to power a relay and feed battery power for a pump....or do as I have done now and take power for a fuel pump completely out of the TB control.
     
  20. bobc455

    bobc455 Well-Known Member

    I'm sure you've done this, but for everyone else reading... If you bypass the ECU for fuel pump control, be sure you wire an oil pressure switch into your FP relay circuit. You do NOT want the fuel pump to continue pumping fuel if you crash and the engine stops, it's a serious fire hazard.

    -BC
     

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