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Thread: 300 tDi "lag" on takeoff

  1. 18th June 2014, 07:26 PM #61
    ROAMER_AUS
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    Quote Originally Posted by Dougal View Post
    How do you know? Have you driven another 300tdi?

    This is my forst tdi but doesn't feel like an engibe should feel normally.

    To know if your turbo is working and how well it's working.
    Fair enough. But not really necessaty for egt monitoring. Right?

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  2. 18th June 2014, 07:27 PM #62
    ROAMER_AUS
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    Oh nooo you mentioned auto again just kidding all good!

    Yeah pump tweak is the way to go!

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  3. 18th June 2014, 08:32 PM #63
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    isuzurover
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    Quote Originally Posted by ROAMER_AUS View Post
    Fair enough. But not really necessaty for egt monitoring. Right?

    Sent from my GT-I9300 using AULRO mobile app
    No, however boost and EGT are inversely related. So if your boost is lower than it should be, your EGTs will be high. If you can't measure boost to know it is too low you would instead be likely to turn the fuel down to lower EGT...
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  4. 19th June 2014, 06:05 AM #64
    Dougal
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    Quote Originally Posted by DiscoMick View Post
    Not meaning to continue a hijack but the auto allows left foot braking to build up the revs to 1800 rpm when stopped at lights and then lift the foot and off mine goes pretty fast for an old truck of this weight.
    And with a manual you can clutch out at higher rpm. Same result.

    I get a pretty good launch from my manual 4BD1T from clutching out at 2000rpm. I don't want to try it at higher rpm.
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  5. 19th June 2014, 07:08 AM #65
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    Quote Originally Posted by isuzurover View Post
    No, however boost and EGT are inversely related. So if your boost is lower than it should be, your EGTs will be high. If you can't measure boost to know it is too low you would instead be likely to turn the fuel down to lower EGT...
    Doesn't the boost compensator mean that if boost was low at high revs, then not as much fuel would be allowed? Meaning if boost is low, then IP would not be allowed to use full fuel.

    Or is the boost compensator at fully open with only a small amount of boost? (IE it's purpose is mostly to reduce fuel at NO boost).
    - Justin

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  6. 19th June 2014, 07:25 AM #66
    Dougal
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    Quote Originally Posted by Judo View Post


    Doesn't the boost compensator mean that if boost was low at high revs, then not as much fuel would be allowed? Meaning if boost is low, then IP would not be allowed to use full fuel.

    Or is the boost compensator at fully open with only a small amount of boost? (IE it's purpose is mostly to reduce fuel at NO boost).
    The boost compensator on these should be proportional up to about 15psi. The gauges are to tell you what isn't working properly.

    A ripped boost compensator on most engines means it doesn't move and give you full fuel until you're on full boost. The hole off idle gets bigger and bigger and drivability really takes a hit.
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