Injector Upgrade and Tuning

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Thread: Injector Upgrade and Tuning

  1. #1
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    Injector Upgrade and Tuning

    I have a ProEfi 128 with a Precision 6266 in a 94 Supra that still has 100% stock fuel. I've had my ProEfi tuned by Larry at SP up to the limit of the stock fuel, roughly 475 HP. I'm getting ready to install FIC 1000CC's and was wondering if I were to just go into the ECU and change my injector sizing to match, will the car run OK? I don't plan on making more power past the point where Larry tuned it until I get the fuel pumps installed which I understand I may need some additional tuning to get the higher HP numbers. If I stick with the same boost/power level can I expect the same level of performance after the injector swap or does it need another spin on the dyno to run correctly?
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    1994 Supra TT
    BL Built auto w/ Induction Performance 4000 stall convertor
    CP .020 pistons, Eagle rods, Brian Crower valve train
    Precison 6266, ProEfi, Lots of other stuff

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    SupraForums Member Jostar's Avatar
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    I would just finish the fuel pump and injectors swap, then retune..
    Getting out Boosted by Turbobozzer... for now...

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    you can get a baseman from larry once you install the 1000's and pumps and drive to get retuned. i had your fuel set up and base map fired right up and ran flawlessly
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    Thanks for the feedback. It it makes sense to just get the pump and new lines ran at the same time. If it runs bad at least I'm ready for the full tune instead of being flat footed with new injectors and a stock pump. Glad to hear the base map was good, I'm about a 3 hour drive to SP and have hobbled it up there twice before for tuning so if I can get by for a while that would be ideal. Had my fingers crossed that the ProEfi would compensate the fuel map from stock 550's to the required control for 1000's without a retune as long as I didn't try getting into the powerband that hadn't been tuned yet.

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  8. #6
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    Hey now you're talking Larry! It's good to hear we've got some options. I will give the shop a call in the future once I get closer to installing the new fuel system. I thought I had my plan all figured out with running a duel feed single return pump gas setup but now with the ProEfi it seems like a waste to not at least be flex fuel capable. If anyone's got any good advice I'd love to hear it but my plan is to run a single Walbro 450 E85 capable pump with the FIC 1000 CC injector. Power goals anywhere between 600-750 I'd imagine for now.
    Last edited by tgossett; 03-28-2017 at 10:00 AM.

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