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  1. #1021
    Donating Users Slick2500's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    Stock GTP injectors flow enough to run a v8 on e85?

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  2. #1022
    Solving problems BrandonHall10's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    Should be good. Here's how it breaks down...

    W-body fuel pressure is 3 bar (43.5 psi).
    Truck fuel pressure is 4 bar (58.0 psi). This is a 33% increase.
    L67 injectors flow 36lb @ 3 bar. Multiply that times 33%, makes them closer to 45lb.
    LQ4 injectors flow 25lb @ 4 bar.
    So... If we push 4 bar through L67 injectors, they now flow 45lb. This is an 80% increase over the stock 25lb LQ4 injector.

    The general consensus is, you need to increase your fuel systems flow capacity by at least 30% for E85 over pump gas. At 80% over the stock injector flow rate, I should have plenty of headroom on the L67 injectors even after the increased demand of E85.

    This is all assuming my math is even remotely close to correct.

  3. #1023
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    Did you buy a alcohol sensor or are you just going to run open loop?

    I feel you'll have problems with fuel trims without a sensor. E85 is great but tuning can be trouble some if the computer doesn't know what the alcohol content is.

    SMGPFC Member #1

  4. #1024
    Solving problems BrandonHall10's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    I'll probably still run closed loop and just change stoich in the tune.

    Our E85 seems to stay a pretty consistent. Every time I've tested it it's between 85% and 90%. I use the "Quick fuel" vial type tester.

    I may someday switch PCM's or OS's or whatever I need to run a content sensor, but I'm not anywhere near that yet.

  5. #1025
    Solving problems BrandonHall10's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    In a continued effort to control the airflow through the radiator, I made some baffles for the grill.



    Shortly after this picture was taken, the baffles were painted satin black and pop riveted into place. Meh.

  6. #1026
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    I added an ethanol content sensor to my 2008 GXP, was a simple process adjusting the tune for it. am really liking the flexfuel capability.

  7. #1027
    Solving problems BrandonHall10's Avatar
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    Default Re: Project LQ4 - V8 S10 - Fueling issues solved.

    Quote Originally Posted by SgtMarshal View Post
    I added an ethanol content sensor to my 2008 GXP, was a simple process adjusting the tune for it. am really liking the flexfuel capability.
    I bet I could log the ethanol content with a stock sensor wired into my MPVI Pro... I'll cross that bridge when I get there.

    In the meantime, I mounted the power steering fluid cooler. Not the most important thing on the "to do" list, but the price was right. It was in the pile of leftover donor truck parts and I had some spare time.





    Pretty happy with how it tuned out. Still need to plumb it, but that shouldn't be too hard. Thinking I can probably get away with just using high pressure hose clamps. It'll be on the low pressure side...

  8. #1028
    Solving problems BrandonHall10's Avatar
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    Default Re: Project LQ4 - V8 S10 - Power steering issues getting fixed...

    Had a good haul at the junkyard today. A high pressure power steering hose, Cherokee sector shaft, and 3 PCM connectors.



    A quick cut with the grinder, a couple dabs of weld and a little satin paint and the new steering shaft was done.



    So much tighter than that sloppy rag joint.



    Tighter steering and more header clearance; Win, win!



    Tomorrows plan is to replace the power steering hose and adapter in the back of the pump. Not sure which one is causing the leak, but it's been leaking since day one of the swap. That will also give me a chance to plumb the cooler I mounted the other day...

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