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TBI from 350 onto 454

Discussion in 'The Injection Section' started by mrk5, Oct 7, 2016.

  1. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    Yeah, that appeals to me because down the road I might be inspired to hop up the 454. Another thing I liked about the Holley Sniper is that it can control both Windstar fans independently and allow me to set whatever temperatures I want for on/off.
     
  2. skunked

    skunked in the garage Premium Member GMOTM Winner

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    FiTech will do the same from what I understand. I have not used it but the two wires are there and I saw the option on the handheld.
     
  3. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    You have to step up to the "Power Adder" model which is about $200 or $300 more than the Holley Sniper. I would prefer to go with FiTech because they have more time behind the product where the Holley is new to the market but that's a significant price difference.
     
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  4. az_762_nato

    az_762_nato Dysfunctional Veteran Premium Member

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    I'm down to tune! I've got mine running damn smooth and pulling great mpg on the highway. Ran down to Walsenburg and back the other day and averaged 17.1mpg. Did realize the truck needs a roadrunner slant nose on it, at 90mph if you let off the throttle, it feels like you threw and anchor out! I'm enjoying running up the passes and Mt Antero without having to stop every so often to retune the carb!
    I'm also working on a plug and play adapter for dropping in a 16197427 pcm and running it with a maf. The maf code has all kinds of fun sounding things to play with like independent control of dual fans, wbo2 logging, etc. Really only going to do it just to give me something to do once the snow comes and I close up the mines for the year
     
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  5. bent72

    bent72 Desert Solitaire Premium Member GMOTM Winner

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    Awesome. So glad we have a resident fuel injection nerd again!
     
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  6. az_762_nato

    az_762_nato Dysfunctional Veteran Premium Member

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    Well, if I can do half of what Mark did, we'll all be set!
     
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  7. GonicGM

    GonicGM 1/2 ton status Premium Member

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    I believe the early 454 TBI did not have knock sensor, hence the pathetic factory advance curve. I think the knock sensor feedback is a big one for being able to push the limit on compression, octane, advance. Anyone add knock sensor and wiring to TBI ecm/harness, not originally equipped?

    Likewise, anyone convert 454 TBI to closed loop idle at temp with heated O2? I'm led to believe 454 was open loop at idle despite coolant and O2 temp whereas 4.3 or SBC may stay closed at idle with proper temps.
     
  8. az_762_nato

    az_762_nato Dysfunctional Veteran Premium Member

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    Not a 454, but I've ran my converted sbc in both open and closed loop for tuning, in idle and off idle. There are a few different scalers in the xdf that are used to adjust the timer/temp/etc for when the engine is in closed loop or open. I'm now on a maf 7427 setup, but my 7747 definitely idled better in open loop
     
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  9. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    Well I'm still not decided on TBI versus aftermarket. Today I'm leaning towards TBI but yesterday it was aftermarket...... :dunno: :screwy:
     
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  10. az_762_nato

    az_762_nato Dysfunctional Veteran Premium Member

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    Aftermarket will probably bring easier or "self" tuning and possibly more peak power depending on setup chosen, but with TBI I have no doubts that any parts store in the nation even in little towns will have a replacement part should I need one, as well as friends or junkyards will as well
     
  11. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    Yes, that last fact is a big part of the argument for factory TBI.
     
  12. az_762_nato

    az_762_nato Dysfunctional Veteran Premium Member

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    It was honestly 90% of my reason, along with 2% of the reason being waaaay cheaper. The other 8% was because I like messing with stuff, lol. It ran great and I would have left it alone, but I accidentally read about the $0D Maf setup and ended up with a going that route after a while
     
  13. Heavyleft

    Heavyleft 1/2 ton status Premium Member GMOTM Winner

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    It sounds like you are trying to save some coin with Course of Action #1, but I have one of these ECUs for my 350 tbi, http://www.dynamicefi.com/, and im more than happy with it. Just another option for ya.
     
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  14. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    I was looking at that earlier. What ECM did you have originally?
     
  15. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    I ask because if I stick with TBI, I want to replace my hacked up harness.
     
  16. bp71k5

    bp71k5 3/4 ton status Premium Member

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    Scott,

    Why not just use an 7747 ECM from a 350 with a knock sensor and grab a stock harness out of the wrecking hard? Is there a special reason for using a 454 ECM, or is the plan to jaunt run a stock tune? I'm running the same setup and tuning isn't all that hard.
     
  17. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    I'm not really interested in burning chips. A few years ago when I had more free time I might have tackled it. I'd rather have something already set to go or something that will self tune and/or use an easy interface to tune on the fly. I don't necessarily have a problem with pulling the stuff from the junkyard, the TBI trucks just aren't showing up very often the yard here anymore.
     
  18. bp71k5

    bp71k5 3/4 ton status Premium Member

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    Hmm, maybe grab a chip from a 454 and put it in the ECM for a 350? Knock sensor won't do anything but at least the tune would be stock? I have no idea if that would work though.
     
  19. mrk5

    mrk5 The Sticker Guy Moderator GMOTM Winner Author

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    Post 90 454 had knock sensors. That's what I need an ECM from, ideally.
     
  20. doubletrouble

    doubletrouble 1/2 ton status Premium Member

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    I like my TBI 454, I talked to Performance Fuel injection and he hooked me up with what I needed. I sent him my tbi and he rebuilt it, flowed and cleaned my two sets of injectors, an ecm, stand alone wiring harness and all new sensors shipped in two days for $560.
     
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