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Thread: Turbo Upgrades for the GUIV TD42Ti

  1. #501
    ......... MB's Avatar
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    Looks sweet to my curvaceous gut graphs Mark mate! What are you chasing for exactly mate?


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    Legendary Rossco's Avatar
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    Hey Markie, bugger your not happy with it numbers look very good but not so good to drive yeah? What about swapping out just the compressor side of turbo to something smaller that spools a bit quicker? Would of hoped jpc got it spot on in the first place i spose?

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    Drop her into Low Range 1st and climb TD42T steady @ 2,100.3142 Pythagorous exactly


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    Big exhaust wheels

    Noted he has increased fuel low down from AFR 17 to 14:1 in an attempt to get boost, do you notice more smoke low down?

    Those figures are good though must say, but do understand your like for more low down. Long for torque like that mid range and now I see why you like to move a long.

    Mark, read your post again, why it is blowing less smoke (tune)? Have near no knowledge with waste gate design turbo but with my VNT high flowed Garrett, it was initially a bit laggy low down and to get it to spool/boost earlier, was either to give it more fuel low down or to keep the veins closed longer by reducing the actuator rod length so less vacuum to lift the actuator lever to hit the stop to keeps the veins closed longer to get the turbo to spin up faster low down. Interested to learn here,
    Last edited by Bidja; 19th November 2018 at 01:25 AM.
    2008 GU WAG ST Manual CRD - To do the job

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    https://youtu.be/IUoiy22Q_lw



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    Rossco (19th November 2018)

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    Quote Originally Posted by mudski View Post
    I had the kettle dynoéd at Dieseltec last week. Geez Andy is different person to deal with.... Anyhow, he spent the day trying different tunes and this is what he came up with.
    Attachment 76897

    He came to the conclusion that a Garret GT3071 is too big for a TD42. The turbo starts making boost later in the rev range than what should be for a TD. As this has been the way since I have had it, I don't know any different. I just drive it in the power range it delivers. Boost down low would be nice, but I cannot justify spending more just for that.
    He suggested if I wanted to have lower boost to get a 2863 or Similar. Meh! I just want to get rid of it now.

    But atleast now there very minimal smoke. It was a choo choo train before.....
    This is my dyno tuned by him, 12mm pump and gtx2863
    You are getting a higher output, eventually. If it were me I'd put up with it for a couple of years cos I'm sure it is still good to drive. Then go with the Borgwarner. I'm not a huge fan of the power delivery from the Garretts, it's like wait, wait, wait then all of a sudden it comes on hard.
    The BW builds up more gradually and comes on full song earlier.



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    Last edited by MudRunnerTD; 19th November 2018 at 11:35 AM.

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    Hodge (19th November 2018), Rossco (19th November 2018)

  10. #507
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    Quote Originally Posted by Bidja View Post
    Why it is blowing less smoke (tune)?
    Tune and they turned his fuel down..
    I followed him up there and and EPA would have had a field day on him....
    But on the way home it was just a haze of smoke. Much much less than pre tune..

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    2005 TD42TI

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    Quote Originally Posted by Hodge View Post
    Tune and they turned his fuel down..
    I followed him up there and and EPA would have had a field day on him....
    But on the way home it was just a haze of smoke. Much much less than pre tune..

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    Think I read graph wrong. So the blue trace was before tune on the 12th Nov?

    Black trace is current result (higher AFR)?
    2008 GU WAG ST Manual CRD - To do the job

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    Quote Originally Posted by Bidja View Post
    Think I read graph wrong. So the blue trace was before tune on the 12th Nov?

    Black trace is current result (higher AFR)?
    Black is before, blue is after.

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    Quote Originally Posted by Winnie View Post
    Black is before, blue is after.

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    Yeah, this is how I read it first (blue current tune with reduced AFR/richer mix).

    My understanding: lower the AFR is richer the mix (more fuel)) means smoke and engine heat. Not enough fuel (a high AFR) means clean running and lower engine temperatures.
    2008 GU WAG ST Manual CRD - To do the job

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