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Thread: 4BD1T Turbo Sizing and Performance Prediction.

  1. 2nd December 2014, 10:58 PM #431
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    steveG
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    Quote Originally Posted by Vern View Post
    Well after some advice via pm from another forum member, I wound the fuel screw all the way back in, then out to 1.5turns, boost back to 15psi, went so much better, no problems up hill either, just foot to the floor. So will muck around with fuel and boost a bit more until it right.
    Hopefully that is all it was, road was a bit busy to have a good run
    Can anyone explain in "diesel for dummies" terms whats actually going on here?
    I'd always thought that more fuel (as long as you had enough air/boost to burn it) equated to more power/torque. Feels like I've missed something fundamental now...

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
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    1999 300tdi 130 single cab - "stock as bro"
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  2. 2nd December 2014, 11:09 PM #432
    85 county
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    Quote Originally Posted by steveG View Post
    Can anyone explain in "diesel for dummies" terms whats actually going on here?
    I'd always thought that more fuel (as long as you had enough air/boost to burn it) equated to more power/torque. Feels like I've missed something fundamental now...

    Steve
    no you have not missed something fundamental, just the fundamentals have never been posted.
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  3. 3rd December 2014, 05:39 AM #433
    Phil B
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    I agree with Steve. I don't get it either.
    A basic lesson on tuning of or calibrating diesel pumps is obviously needed. Please.
    Thanks,
    Phil.
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  4. 3rd December 2014, 06:09 AM #434
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    Quote Originally Posted by Phil B View Post
    I agree with Steve. I don't get it either.
    A basic lesson on tuning of or calibrating diesel pumps is obviously needed. Please.
    Thanks,
    Phil.
    Seconded.

    Maybe start a new thread with a guide?
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  5. 3rd December 2014, 06:49 AM #435
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    Quote Originally Posted by steveG View Post
    Can anyone explain in "diesel for dummies" terms whats actually going on here?
    I'd always thought that more fuel (as long as you had enough air/boost to burn it) equated to more power/torque. Feels like I've missed something fundamental now...

    Steve
    I'm with Steve too, confused...
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  6. 3rd December 2014, 07:08 AM #436
    85 county
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    Guys

    I have attempted to post before and been poo pooed / shouted down etc.

    will only talk in private because of that, i only contacted Vern because it was frustrating seeing someone lead up the garden path.
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  7. 3rd December 2014, 07:11 AM #437
    Dougal
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    Quote Originally Posted by steveG View Post
    Can anyone explain in "diesel for dummies" terms whats actually going on here?
    I'd always thought that more fuel (as long as you had enough air/boost to burn it) equated to more power/torque. Feels like I've missed something fundamental now...

    Steve
    Yes enough fuel and burning it cleanly will produce the power. It just depends where that power is going.
    If you have airflow restrictions then huge amounts of power will be used to blow/suck against those restrictions, which reduces crank power.
    If you have timing too far advanced or retarded then significant amounts more power can be lost as heat through the cooling system or exhaust instead of pushing pistons.

    I don't know what's going on with the fuel adjustment up and down. But I suspect something got hung up internally in the governor.
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  8. 3rd December 2014, 10:31 AM #438
    workingonit
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    I'd like to hear from Vern after a slightly more extended run, and maybe with his intended towing load, to knowing that he is truly happy with performance after the adjustment.

    85 county, I'd be happy to be PMed your information.
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  9. 3rd December 2014, 11:38 AM #439
    Phil B
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    85 County

    ditto for me please.

    Phil B
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  10. 3rd December 2014, 02:16 PM #440
    Ean Austral Guest
    keep it to the topic guys, getting personal is not helping anyone and will just result in posts being deleted.




    Cheers Ean
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