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Thread: Injector flow rate

  1. #1
    Junior Member gotabav's Avatar
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    Default Injector flow rate

    Anybody know what units this injector flow rate is in? How would this equate to lbs./hr.?
    Injector flow rate.xls
    2005 Cadillac CTS-V- Forged 383, twin Turbonetics 60-1 hair dryers
    2003 GMC Envoy 5.3-(aka family truckster) bolt ons and tuned
    1999 Chevy S-10-The gutless wonder work truck

  2. #2
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    The S10 2.2 is in lbs/min. They are roughly 18lb/hr injectors. Go to the conversions page in the tune tool to get exactly what they are.
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

  3. #3
    Junior Member gotabav's Avatar
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    I figured that, but found it odd that no measurement units were listed and .2 lbs./min. is only 12 lbs./hr. The limits seem odd as well, .7 or 42 lbs./hr. Not that more is needed, I'm just not used to seeing these limits. When trying to change from lbs./min to lbs./hr. there is no change in the numbers either. I opened other tunes and the values would change depending on what measurment units I changed it to. Oh well, I can do the math. I've never tuned one of these 4 bangers before. They seem pretty limited on what can be changed with any effect.
    2005 Cadillac CTS-V- Forged 383, twin Turbonetics 60-1 hair dryers
    2003 GMC Envoy 5.3-(aka family truckster) bolt ons and tuned
    1999 Chevy S-10-The gutless wonder work truck

  4. #4
    Junior Member gotabav's Avatar
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    I finally got around to playing with my S10 and some odd things occured. I swapped out the stock injectors for some 42 lb./hr. injectors I had from a previous project. When I maxed out the IFR table the engine wouldn't even run. (42 lb./hr /60=.7 lb./min.) I couldnt keep it running on anything except .2 for a setting. I don't think the IFR is in lb./min. It must be in some other form of measurement. Now it runs great with a LN2 flex fuel tune loaded except under heavy throttle. The injector duty cycles jump to a crazy %, anywhere from 300% to 900%, and it goes pig rich and falls on it's face. I haven't touched anything except the spark tables and the engine diagnostics. Anybody come across this before?
    2005 Cadillac CTS-V- Forged 383, twin Turbonetics 60-1 hair dryers
    2003 GMC Envoy 5.3-(aka family truckster) bolt ons and tuned
    1999 Chevy S-10-The gutless wonder work truck

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    Whynot send efilive an email asking what units the flow rate is in? I dont know why they didnt label what units it is in. Very strange and frustrating.
    1997 S10, 06 trailblazer SS LS2 swap, 4L70E trans, 76mm turbo. Factory ZQ8 suspension. 3.08, G80 w/a zexel. With a 0411 swap.

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